Synodontis Cuvier

John P. Friel & Thomas R. Vigliotta, 2006, Synodontis acanthoperca, a new species from the Ogooue River system, Gabon with comments on spiny ornamentation and sexual dimorphism in mochokid catfishes (Siluriformes: Mochokidae)., Zootaxa 1125, pp. 45-56 : 45-46

publication ID

z01125p045

publication LSID

lsid:zoobank.org:pub:5EFC4D07-EB68-42A8-BE7D-3E99DA13AF1B

DOI

https://doi.org/10.5281/zenodo.6491904

persistent identifier

https://treatment.plazi.org/id/A51308C1-090F-37AE-12F9-C27FE529BBD9

treatment provided by

Thomas

scientific name

Synodontis Cuvier
status

 

[[ Genus Synodontis Cuvier View in CoL View at ENA   ZBK ]]

The genus Synodontis Cuvier, 1816   ZBK is the most species rich and widespread genus of mochokid catfishes. As currently recognized the genus contains approximately 120 valid species distributed throughout most of the freshwaters of sub-Saharan Africa and the Nile River system. Larger Synodontis   ZBK species are important food fishes in many parts of Africa and are commonly known as “squeakers” because they readily produce sounds by stridulating their pectoral spines when handled or disturbed. Furthermore many Synodontis   ZBK species are prized ornamental fishes because they have striking pigmentation patterns or display unusual behaviors like an upside down swimming posture.

Poll (1971) last revised the entire genus and noted seven species reported from Gabon based on specimens he examined or previous published accounts and faunal lists: S. angelicus Schilthuis 1891   ZBK , S. albolineatus Pellegrin 1924   ZBK , S. guttatus Guenther 1865   ZBK , S. haugi Pellegrin 1906   ZBK , S. obesus Boulenger 1898   ZBK , S. polyodon Vaillant 1895   ZBK and S. tessmanni Pappenheim 1911   ZBK . Four of these species have well documented type localities within Gabon ( S. albolineatus   ZBK , S. haugi   ZBK , S. polyodon   ZBK and S. tessmanni   ZBK ) and appear to be endemics of the Ogôoué or Ntem Rivers and their tributaries.

In contrast, the presences of S. angelicus   ZBK , S. guttatus   ZBK , and S. obesus   ZBK in Gabon are uncertain or possibly erroneous. First, the claim for S. angelicus   ZBK is based on the junior synonym S. tholloni Boulenger 1901   ZBK known from a single specimen (MNHN 1890-0030) collected at an unspecified locality possibly within the Ogôoué basin of Gabon. Otherwise, S. angelicus   ZBK is known exclusively from the Congo basin. Second, Poll (1971) did not find any specimens of S. guttatus   ZBK from Gabon, questioned published records from Gabon by Sauvage (1880, 1884) and concluded that the species is only found in the lower Niger basin. Finally, Boulenger (1898) described S. obesus   ZBK based on three syntypes, one from the Opobo River, Nigeria (BMNH 1896.5.5.67) and two from an unspecified locality in Gabon (BMNH 1881.7.20.5-6). Poll (1971) subsequently designated the Nigerian syntype as the lectotype for S. obesus   ZBK . Given this type fixation and the uncertain locality data for the paralectotypes, the presence of S. obesus   ZBK in Gabon remains ambiguous.

Since Poll’s revision, the first author and others have made many more collections of Gabonese fishes. Review of this material for an upcoming edited book on the freshwater fishes of West Central Africa (Lower Guinea) has revealed the presence of at least eight Synodontis   ZBK species in Gabon. These include the previously known endemics ( S. albolineatus   ZBK , S. haugi   ZBK , S. polyodon   ZBK , and S. tessmanni   ZBK ), plus four additional species. One of these, S. batesii Boulenger 1907   ZBK , originally described from the Congo basin of Cameroon, is now known from both the Ogôoué and Ntem basins of Gabon. The other newly recorded species are currently under study by several researchers. One of these new species that has unique bony ornamentation and sexual dimorphism is described here.

Kingdom

Animalia

Phylum

Chordata

Order

Siluriformes

Family

Mochokidae

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