|Pelomedusa subrufa, African helmeted turtle|
Pelomedusinae Cope, 1868
Pelomedusidae is a family of freshwater turtles endemic to sub-Saharan Africa, including Madagascar, São Tomé, and the Seychelles(Although this pop. may have been introduced by humans). They range in size from 12 to 45 cm (4.7 to 17.7 in) in carapace length, and are generally roundish in shape. They are unable to fully withdraw their heads into their shells, instead drawing them to the side and folding them beneath the upper edge of their shells, hence are called African side-necked turtles.
Pelomedusidae spends most of its time in the mud at the bottom of rivers or shallow lakes, where they eat invertebrates, such as insects, mollusks, and worms. Many species aestivate through the dry season, burying themselves in the mud.
Systematics and taxonomy
The related Podocnemididae is either treated as a distinct family or as a subfamily (Podocnemidinae) in the Pelomedusidae. The African side-necked turtles are then also demoted to subfamily rank, as the Pelomedusinae.
As taxonomic rank is only meaningful as part of a sequence (a biological "family" has no fixed meaning on its own), both treatments are technically correct. Ultimately, the issue hinges upon the Austro-American side neck turtles (Chelidae). These Pleurodira are less closely related to the Podocnemididae and Pelomedusidae than these are to each other. If all three are ranked as full families, the Chelidae is treated as a basal lineage, while the other two are united in the superfamily Pelomedusoidea. This treatment is preferred here, because it allows more convenient placement of prehistoric pleurodires (e.g. the Bothremydidae).
- Aguillon-Martinez, Martha Carolina (2010). Fossil vertebrates from the Cerro del Pueblo Formation, Coahuila, Mexico, and the distribution of Late Campanian (Cretaceous) terrestrial vertebrate faunas. Dallas, Texas: Southern Methodist University. pp. 34–38.
- Pérez-García, Adán (1 October 2019). "The African Aptian Francemys gadoufaouaensis gen. et sp. nov.: New data on the early diversification of Pelomedusoides (Testudines, Pleurodira) in northern Gondwana". Cretaceous Research. 102: 112–126. doi:10.1016/j.cretres.2019.06.003. ISSN 0195-6671.
- Obst, Fritz Jürgen (1998): [Pelomedusinae]. In: Cogger, H.G., & Zweifel, R.G. (eds.): Encyclopedia of Reptiles and Amphibians: 112-113. San Diego: Academic Press. ISBN 0-12-178560-2.
- Edward Drinker Cope. 1868. An Examination of the REPTILIA and BATRACHIA obtained by the Orton Expedition to Equador [sic] and the Upper Amazon, with notes on other species. Proc. Acad. Nat. Sci. Philadelphia 20: 96-140. (Pelomedusidæ, new family, p. 119).
- Goin CJ, Goin OB, Zug GR. 1978. Introduction to Herpetology: Third Edition. San Francisco: W.H. Freeman and Company. xi + 378 pp. ISBN 0-7167-0020-4. (Family Pelomedusidae, pp. 271–272).
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