Tag: Africa

The Diptera of Lesotho: a new Special Collection in African Invertebrates

While the insects of South Africa are well studied, Lesotho remains largely undersampled for flies.

Guest blog post by John Midgley and Burgert Muller

Despite centuries of study, our knowledge of the natural world is still woefully inadequate. This is especially true for inaccessible regions, but these regions often hold interesting species of communities to study. The best studied country in the Afrotropics is South Africa, but nearby countries have received much less attention.

Malaise trap over a stream at Sehlabathebe National Park.

The Kingdom of Lesotho is nestled within the borders of South Africa and this landlocked country shares many ecological similarities with its neighbour. However, Lesotho has an average altitude that is 900 m higher, leading to differences in its fauna and flora, especially in its alpine areas, as these are much more extensive than in South Africa.

View south-east from Moteng Pass in northern Lesotho.

While the insects of South Africa are well studied, in particular the True flies (Diptera), Lesotho remains largely undersampled for flies, and that in combination with its unique habitat has created an opportunity to contribute to the country’s biodiversity knowledge.

Malaise trap at Roma Trading post lodge. Even though the area is a modified garden site, Lesotho lacks basic biodiversity data and species were collected for the first time from Lesotho.

With discovery on their minds, Dipterists from four institutions (KwaZulu-Natal Museum, National Museum, Albany Museum and Royal Museum for Central Africa) planned to undertake several fieldtrips to Lesotho. The aim was not to just increase the holdings of the institutions, as this would be short-sighted. Instead, the goal was to promote conservation and to improve on the current knowledge on the Diptera of Lesotho. The rest is natural history, and the special collection on the Diptera of Lesotho in African Invertebrates was born.

Pristine grassland at Sehlabathebe National Park. Large parts of Lesotho are modified by agriculture, but in remote areas pristine sites remain.

Even areas that have received little attention are not complete blank slates, and a handful of expeditions to Lesotho were undertaken in the mid-20th Century, most notably by the Lund Zoological Institute, The KwaZulu-Natal Museum, The Durban Natural Science Museum and the Albany Museum, but large targeted and purposeful collections are not common. The specimens from these expeditions are housed at various international and local South African institutions, which do have some limited collections of Lesotho material.

Letšeng la Letsie is the largest alpine lake in Lesotho, but despite being a protected area is heavily influenced by grazing.

We added three further expeditions to this, in December 2021, November 2022 and January 2023, adding over 7000 specimens to the National Museum, Bloemfontein and KwaZulu-Natal Museum collections. The details of these specimens can be found in our recently published introduction to the Special Collection along with photographs of the collection sites from our expeditions.

New tarantula species from Angola distinct with a one-of-a-kind ‘horn’ on its back

A new to science species of tarantula with a peculiar horn-like protuberance sticking out of its back was recently identified from Angola, a largely underexplored country located at the intersection of several Afrotropical ecoregions.

Collected as part of the National Geographic Okavango Wilderness Project, which aims to uncover the undersampled biodiversity in the entire Okavango catchment of Angola, Namibia and Botswana, thereby paving the way for sustainable conservation in the area, the new arachnid is described in a paper published in the open-access journal African Invertebrates by the team of Drs John Midgley and Ian Engelbrecht.

Although the new spider (Ceratogyrus attonitifer sp.n.) belongs to a group known as horned baboon spiders, the peculiar protuberance is not present in all of these species. Moreover, in the other species – where it is – the structure is completely sclerotised, whereas the Angolan specimens demonstrate a soft and characteristically longer ‘horn’. The function of the curious structure remains unknown.

The new tarantula’s extraordinary morphology has also prompted its species name: C. attonitifer, which is derived from the Latin root attonit– (“astonishment” or “fascination”), and the suffix –fer (“bearer of” or “carrier”). It refers to the astonishment of the authors upon the discovery of the remarkable species.

“No other spider in the world possesses a similar foveal protuberance,” comment the authors of the paper.

*Individual of the newly described species in defensive posture in its natural habitat. Photo by Kostadine Luchansky.*

During a series of surveys between 2015 and 2016, the researchers collected several female specimens from the miombo forests of central Angola. To find them, the team would normally spend the day locating burrows, often hidden among grass tufts, but sometimes found in open sand, and excavate specimens during the night. Interestingly, whenever the researchers placed an object in the burrow, the spiders were quick and eager to attack it.

The indigenous people in the region provided additional information about the biology and lifestyle of the baboon spider. While undescribed and unknown to the experts until very recently, the arachnid has long been going by the name “chandachuly” among the local tribes. Thanks to their reports, information about the animal’s behaviour could also be noted. The tarantula tends to prey on insects and the females can be seen enlarging already existing burrows rather than digging their own. Also, the venom of the newly described species is said to not be dangerous to humans, even though there have been some fatalities caused by infected bites gone untreated due to poor medical access.

In conclusion, the researchers note that the discovery of the novel baboon spider from Angola does not only extend substantially the known distributional range of the genus, but can also serve as further evidence of the hugely unreported endemic fauna of the country:

“The general paucity of biodiversity data for Angola is clearly illustrated by this example with theraphosid spiders, highlighting the importance of collecting specimens in biodiversity frontiers.”

Apart from the described species, the survey produced specimens of two other potentially new to science species and range expansions for other genera. However, the available material is so far insufficient to formally diagnose and describe them.

*The newly described baboon spider species (Ceratogyrus attonitifer), showing the peculiar soft and elongated horn-like protuberance sticking out of its back. Photo by Dr Ian Enelbrecht.*

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Original source:

Midgley JM, Engelbrecht I (2019) New collection records for Theraphosidae (Araneae, Mygalomorphae) in Angola, with the description of a remarkable new species of Ceratogyrus. African Invertebrates 60(1): 1-13. https://doi.org/10.3897/afrinvertebr.60.32141

3D avatars for three new rare ant species from Africa including the Obama ant

Three new, rare ant species recently discovered in Africa were named after important figures for the African biodiversity conservation – the former United States president Barack Obama, the Nigerian writer and environmental activist Ken Saro-Wiwa, and the world-renowned biologist Edward O. Wilson.

The scientists from the Okinawa Institute of Science and Technology Graduate University (OIST), who had their discovery published in the open access journal ZooKeys, used a new, revolutionary method to compile scans of the ants and create 3D avatars allowing for a unique and detailed visualisation of the insects’ insides.

https://skfb.ly/6sPvr

Curiously, the Obama ant, Zasphinctus obamai, was collected from the Kakamega Forest National Park, Kenya, located near Barack Obama’s ancestral family village. The 44th President of the United States of America is famous for his numerous initiatives towards the conservation of fragile natural habitats around the globe.

Ken Saro-Wiwa, who also has his name perpetualised in the new ant species Zasphinctus sarowiwai, was a Nigerian writer and environmental activist who, after campaigning against irresponsible oil development, was executed in 1995.

“By naming a species from threatened rainforest habitats after him, we want to acknowledge his environmental legacy and draw attention to the often-problematic conservation situation in most Afrotropical rainforests,” explain the biologists in their paper.

The third new species, Zasphinctus wilsoni, bares the name of the biologist Edward O. Wilson, whose foundation has contributed greatly to the resurrection of the Gorongosa National Park in Mozambique.

The 3D avatars were created with the help of X-ray microtomography, or micro-CT, which is a technology similar to the one used in hospitals for CT scans, but relying on much higher resolution. The three-dimensional reconstructions made it possible for the scientists to look into details as tiny as the ants’ mouthparts and even their legs and hairs. Moreover, this method does not require damaging the rare specimens.

“We saw things that nobody ever looked at,” says Dr. Hita Garcia, first author on the study and a member of the Biodiversity and Biocomplexity Unit at OIST.

While closely related ants had already been known as predators of other ant species, the scientists needed to study the data provided by the scans to confirm that the new species are top predators as well.

“Normally when you describe a new species, you don’t know much about its biology,” further explains Dr. Hita Garcia, “but with the 3D reconstructions researchers can discover details right away.”

To the biologists, these reconstructions hint at a future of virtual taxonomy with the potential to alleviate issues of time, money, and specimen damage.

Furthermore, the 3D models also allow for the data to be easily accessible from anywhere. To show this, the scientists have uploaded the reconstructions to the open access Dryad Digital Repository.

“If someone wants to see the Obama ant, they can download it, look at it, and 3D print it,” Dr. Hita Garcia points out.

“Since these ants are from very threatened habitats in Africa, we wanted to pick names that draw attention to the environment, and not just the ants,” he concludes. “The rainforests in equatorial Africa, as well as the savannah in Mozambique, needs to be protected before the habitats and animals living within them are destroyed.”

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Find the original public announcement available via the OIST’s website: https://www.oist.jp/news-center/news/2017/8/29/say-hello-3d-obama-ant

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Reference:

Hita Garcia F, Fischer G, Liu C, Audisio TL, Economo EP (2017) Next-generation morphological character discovery and evaluation: an X-ray micro-CT enhanced revision of the ant genus Zasphinctus Wheeler (Hymenoptera, Formicidae, Dorylinae) in the Afrotropics. ZooKeys 693: 33-93. https://doi.org/10.3897/zookeys.693.13012

Assassins on the rise: A new species and a new tribe of endemic South African robber flies

Discovery of a new species of assassin flies led to the redescription of its genus. This group of curious predatory flies live exclusively in South Africa, preferring relatively dry habitats. Following the revisit, authors Drs Jason Londt, KwaZulu-Natal Museum, South Africa, and Torsten Dikow, Smithsonian Institution National Museum of Natural History, USA, publish updated information about all species within the genus, now counting a total of seven species, and also establish a new tribe. Their study is published in the open access journal African Invertebrates.

The family of assassin flies (Asilidae), also known as robber flies, are curious insects, which have received their common name due to their extremely predatory behavior. The assassin flies prey on a great variety of insects, including beetles, moths, butterflies, wasps, other flies, as well as some spiders, as early as their juvenile stage of development. When hunting, they would ambush their prey and catch it in flight. Then, they would pierce the victim with a short and strong proboscis, while injecting venom. Once in the body of the prey, it quickly dissolves the insides, so that the assassin fly can suck them out.

The published study was spawned by the collection of new specimens of previously described assassin flies of the species Trichoura tankwa by the junior author in December 2015. These specimens could not be easily identified and so the authors started to look at all available specimens in natural history museums.

The new species, called Trichoura pardeos, was discovered in Tierberg Nature Reserve by the authors in 2004, a small conservation area located on the north banks of the Gariep River in the Northern Cape province of South Africa. The habitat comprises almost entirely a large rocky hill, where the vegetation is scarce and dominated by drought-resistant plants, such as aloes. The fly is predominantly red-brown in colour, with silvery, white and yellowish markings.

Having noted morphological variation between the species inhabiting areas with differently timed yearly rainfalls, the entomologists suggest that two groups within the studied genus have adapted to these different patterns in western and eastern South Africa. They also expect that species representing Trichoura could be also dwelling in Namibia, Botswana, Mozambique and possibly Zimbabwe.

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Original source:

Londt J, Dikow T (2016) A review of the genus Trichoura Londt, 1994 with the description of a new species from the Northern Cape Province of South Africa and a key to world Willistonininae (Diptera, Asilidae). African Invertebrates 57 (2): 119-135. https://doi.org/10.3897/AfrInvertebr.57.10772

More than just hippos and crocs: The hidden biodiversity of the iSimangaliso Wetland Park

iSimangaliso Wetland Park, a UNESCO World Heritage Site in the sub-tropical north-eastern corner of South Africa has become famous for its birdlife, crocodiles and hippopotamuses that frolic in the warm estuarine waters of Lake St Lucia. However, there’s more to the park than the “big and hairy”, according to aquatic ecologist Prof Renzo Perissinotto at Nelson Mandela Metropolitan University (NMMU) in Port Elizabeth, whose research is published in the open access journal ZooKeys.

“Although we have spent several decades focusing on life in the estuary, we only recently came to realise that much of the wealth of biodiversity in the park exists in the small freshwater ponds that are adjacent to, but disconnected from, the main lake,” he says.

The St Lucia lake itself is generally brackish and is located on a large sandy expanse known as the Maputaland coastal plain. Dotted across the landscape of this coastal foreland are numerous temporary freshwater ponds, seeps and small streams that are disconnected from the brackish lake body.

A team of self-proclaimed “beetle nerds”, led by Prof Perissinotto, got together from NMMU and Plymouth University (UK) and uncovered more species of water beetles in these tiny water bodies than is known for any other similar-sized region in southern Africa.

The beetle collection trips were done over a 16-month period and revealed 68 species of predaceous water beetles alone, termed more formally as the “Hydradephaga”. The iSimangaliso Wetland Park houses approximately 20% of the total number of known species for this beetle group in the whole of southern Africa. Of the species collected during their expeditions, five have never been recorded in South Africa before, highlighting our poor understanding of aquatic insect distributions in this part of the world.

Most of the species collected (almost 80%) belonged to the family Dytiscidae, more commonly known as “diving beetles” due to their lifestyle that involves coming up for air and immediately diving back down to the depths to carry on hunting unsuspecting prey, which can be as large as small fish and amphibians.

Prof Perissinotto and his NMMU colleague Dr Matthew Bird, together with water beetle specialist Prof David Bilton (Plymouth University), collected specimens ranging from 1 mm to almost 5 cm in length (the tadpole eaters). According to Prof Bilton, “Irrespective of size, these water beetles are a crucial component of the iSimangaliso ecosystem in that they are the primary predators in these temporary wetlands, which generally lack fish. Their abundance and diversity can be used to gauge the overall health of wetland ecosystems as they are sensitive to pollution, for instance”.

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Original source:

Perissinotto R, Bird MS, Bilton DT (2016) Predaceous water beetles (Coleoptera, Hydradephaga) of the Lake St Lucia system, South Africa: biodiversity, community ecology and conservation implications. ZooKeys 595: 85-135. doi: 10.3897/zookeys.595.8614

Poorly known South African mountain endemic appears to be a very valuable keystone species

Mountain ecosystems are valuable providers of key resources including water. These ecosystems comprise diverse species, some of which appear to be especially important to the ecosystem’s functioning. In poorly studied mountain environments in biodiversity-rich countries, these keystone species can often be overlooked and undervalued.

Macowania is a group of yellow daisy shrubs occurring in the alpine-like regions of the Drakensberg and highlands of Ethiopia, Eritrea and Yemen. Doctoral student Joanne Bentley, University of Cape Town, studied the genetic relationships between the various Macowaniaspecies and relatives during her Masters degree studies. Her research led to the first collection of the poorly known species Macowania revoluta (known also as the Amathole Macowania) in about 40 years.

The story of Macowania revoluta is published in the open access journal PhytoKeys.

The Amathole Macowania appears to be an exceptionally important keystone species. This is because it forms one of the dominant members of the valuable mountain wetland communities and, thus, likely plays a very important role in wetland functioning and soil protection.

It appears to be somewhat tolerant of woody alien species and a valuable pioneer species protecting its native co-habitants. Plants like this one buffer more sensitive plants from sudden changes in environment (such as forestry, alien invasion and fire), and provide an opportunity for the ecosystem to ‘bounce back’.

113693 Restricted to the Amathole mountains in the Eastern Cape Province, South Africa, the Amathole Macowania was first collected sometime before 1870 by the pioneer botanist Peter MacOwan, and was well documented until around 1949. After that, except for one record in 1976, the plant quietly disappeared.

“This was the first Macowania species that we found during our fieldtrip across the greater Drakensberg. We had combed several of the localities where it had been collected before; mostly from several decades ago, some from more than a century ago!” says Joanne Bentley. “We became increasingly doubtful about finding the plant, given the heavily transformed plantation landscape.”

“Ready to throw in the towel, we came across a peaty area on the margins of the forest and decided on one last investigation. We were lucky: it was growing prolifically! It was a very special moment.”

As it often happens, exciting discoveries come in bulk. Joanne’s discovery of the plant in July 2010 was followed by another record in October 2010, by the Curator of the Schonland Herbarium, Tony Dold. In 2014 at least three additional localities were recorded along the popular Amathole Hiking Trail by Dr Ralph Clark, Rhodes University. A further record was added in 2015 by Vathi Zikishe, South African National Biodiversity Institute. The verdict: this is a very localised but patchily abundant species, and an ecologically valuable component of the Amathole flora.

Listed as ‘Data Deficient’ in the Threated Plants List for South Africa, this string of modern records of the species also provided the first opportunity to get an idea of its ecology and abundance, as well as the first photographs.

“The practical value of this species in local land restoration projects still needs to be explored, but the opportunities are exciting,” says Dr Clark. “The discovery that this obscure endemic mountain plant is not only abundant, but is, in fact, fulfilling an extremely important ecological role, highlights the value of detailed mountain biodiversity research in southern Africa.”

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Original source

Clark VR, Bentley J, Dold AP, Zikishe V, Barker NP (2016) The rediscovery of the Great Winterberg endemic Lotononis harveyi B.-E.van Wyk after 147 years, and notes on the poorly known Amathole endemic Macowania revoluta Oliv. (southern Great Escarpment, South Africa). PhytoKeys 62: 1-13. doi: 10.3897/phytokeys.62.8348

Novel cybercatalog of flower-loving flies suggests the digital future of taxonomy

Charting Earth’s biodiversity is the goal of taxonomy and to do so the scientists need to create an extensive citation network based on several hundred million pages of scientific literature. By providing a novel taxonomic ‘cybercatalog’ of southern African flower-loving (apiocerid) flies, Drs. Torsten Dikow and Donat Agosti demonstrate how the network of taxonomic knowledge can be made available through links provided to online data providers. Their work is available in the open-access Biodiversity Data Journal.

The present research showcases that the information cannot only be made available to the reader who follows the links, but also to machines that use the growing number of digital, online resources that are linked through persistent identifiers.

Primary data providers for taxonomic information such as species names (ZooBank), specimen images (Morphbank), species descriptions (Plazi), and digitized literature (BHL, Biodiversity Heritage Library; BioStor; and BLR, Biodiversity Literature Repository) play an important role in making data on species available in electronic form. Aggregators such as the Global Biodiversity Information Facility (GBIF) and the Encyclopedia of Life (EoL) gather this information automatically to distribute it even further to audiences beyond the reach of the life sciences.

In contrast to previous species catalogs, in cybercatalogs access to information is provided through links to open-access, online data repositories such as the ones listed above. Taxonomists and other users can now access this literature, species descriptions, and specimen records immediately without a search in a natural history library or collection. The cybercatalog takes advantage of a new publishing platform within the Biodiversity Data Journal that makes it easy to upload species information and links to data about these species through a CheckList template. Furthermore, the Biodiversity Data Journal now allows future updates and re-publications of the cybercatalog with the new unique persistent identifier (DOI, Digital Object Identifier) whenever a new species is described or other taxonomic changes take place.

The authors argue that cybercatalogs are indeed the future of taxonomic catalogs since the online data in them are easily accessible to anyone.

“It is a taxonomist’s dream to have online access to all previously published information on a species and through this step the discipline of taxonomy can (re-)position itself as a central resource within the life sciences and beyond to the public and society at large,” add the authors. “Online access will also help to narrow the gap between the South and the North as a fantastic example of unhindered access to our knowledge of the global biological diversity, which is increasingly under pressure from human populations.”

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For the realization of this project Plazi and Pensoft were partially supported by the EC-FP7 EU BON project (ENV 30845) (Building the European Biodiversity Observation Network).

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Original source:

Dikow T, Agosti D (2015) Utilizing online resources for taxonomy: a cybercatalog of Afrotropical apiocerid flies (Insecta: Diptera: Apioceridae). Biodiversity Data Journal 3: e5707. doi: 10.3897/BDJ.3.e5707

Saucer-like shields protect 2 new ‘door head’ ant species from Africa and their nests

Shaped like saucers, or concave shields, and covered with camouflaging layers of debris, the heads of two “door head” ant species are found to differentiate them as new taxa. They use their peculiar features to block the entrances of their nests against intruders like other predatory ants and invertebrates.

Being only the second case of such highly specialized morphologies discovered in Africa, the new representatives of the genus Carebara have been retrieved from sifted leaf-litter collected in rainforests in Western Kenya and the Ivory Coast.

Because of difficulties usually met while studying and identifying ants through dry specimens retrieved from standardised, passive collection methods, the two new species have so far been taxonomically misplaced. The new discovery was made by an international research team, led by Dr. Georg Fischer and Prof. Evan Economo, Okinawa Institute of Science and Technology Graduate University, Japan. The findings are available in the open access journal ZooKeys.

The “door head” ant individuals are a special worker subcaste that stands out among the other ant colony’s workers, who are responsible for vital tasks such as foraging and brood care. Dr. Georg Fischer and his colleagues analysed the herein described species with next-generation DNA sequencing to show that all different subcastes belong to the same species, despite their highly differing morphologies.

To assure the safety of their nestmates, the queen and the larvae, the two new species have evolved the special worker subcaste with heads covered by a layer of debris such as soil or even organic material, so that they blend in with their surroundings. While the shape of their heads allows them to perfectly fit into the nest entrance, the special armor shields their vulnerable eyes, antennae and mouthparts, as well as highly reduces the chance of enemies intruding into the nest.

The new Carebara species have been given the names C. phragmotica and C. lilith. The former is derived from the term phragmosis, in relation to the special function of their head shape, while the latter comes from the name of a female demon in Jewish mythology.

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Original source:

Fischer G, Azorsa F, Hita Garcia F, Mikheyev AS, Economo EP (2015) Two new phragmotic ant species from Africa: morphology and next-generation sequencing solve a caste association problem in the genus Carebara Westwood. ZooKeys 525: 77-105. doi: 10.3897/zookeys.525.6057