Roberts and Stewart 1976
CountryLower Congo River:fw
Only a Holotype has been assigned: MCZ 50298.
Lower Congo River, near Tadi, Democratic Republic of Congo (5°14'S, 13°56'E).
There are two species in the genus: Gymnallabes typus Günther 1867 and Gymnallabes nops Roberts and Stewart 1976.
The lower Congo River, and especially the northern and southern rapids below Pool Malebo, are home to many endemic species (Roberts and Stewart 1976, Bailey 1986, Thieme et al. 2005, Mamonekene 2005, Alter et al. 2015, Alter et al. 2017, Stiassny 2016). In particular there are at least eleven species, in five Families, which exhibit the troglomorphic features of reduced eyes and pigment:
Gymnallabes nops Roberts and Stewart 1976
These features probably evolved because these species live at depth within the rapids and spend their whole lives in permanent darkness, analagous to life in caves. The ocular and craniofacial anatomy of several of these species have been studied (Schobert et al. 2010, 2011, 2013) but almost nothing else is known about these animals.
Moelants, T. 2010. Gymnallabes nops . The IUCN Red List of Threatened Species 2010: e.T182090A7793310. https://dx.doi.org/10.2305/IUCN.UK.2010-3.RLTS.T182090A7793310.en. Downloaded on 17 March 2020.
|Roberts, T.R. and Stewart, D.J.||Journal Article||1976||An ecological and systematic survey of fishes in the rapids of the lower Zaire or Congo river|
|Poll, M.||Journal Article||1977||Les genres nouveaux Platyallabes et Platyclarias comparés au genre Gymnallabes Gthr. Synopsis nouveau des genres de Clariidae|
|Cabuy, E., Adriaens, D., Verraes, W. and Teugels, D.G.||Journal Article||1999||Comparative study on the cranial morphology og Gymnallabes typus (Siluriformes: Clariidae) and their less anguilliform relatives, Clariallabes melas and Clarias gariepinus|
|Devaere, S., Adriaens, D., Teugels, G.G., De Clerck, N.M. and Postnov, A.A.||Journal Article||2005||Skeletal morphology of the holotype of Gymnallabes nops Roberts & Stewart, 1976, using micro CT-scanning|
|Jansen, G., Devaere, S., Weekers, P.H.H. and Adriaens, D.||Journal Article||2006||Phylogenetic relationships and divergence time estimate of African anguilliform catfish (Siluriformes: Clariidae) inferred from ribosomal gene and spacer sequences|
|Elbein, A.||Web Page||2020||Earth’s deepest river conceals an evolutionary mystery|