Auchenoglanis biscutatus ( Geoffroy Saint-Hilaire, 1809 )

Geerinckx, Tom & Vreven, Emmanuel, 2013, A re-evaluation of the species-level diversity within the catfish genus Auchenoglanis (Siluriformes: Claroteidae), Journal of Natural History 47 (47 - 48), pp. 2979-3010 : 3000-3002

publication ID

https://doi.org/ 10.1080/00222933.2013.802043

DOI

https://doi.org/10.5281/zenodo.4742983

persistent identifier

https://treatment.plazi.org/id/039387B1-FFF2-FFEE-FEC4-7CC69474FCCD

treatment provided by

Carolina

scientific name

Auchenoglanis biscutatus ( Geoffroy Saint-Hilaire, 1809 )
status

 

Auchenoglanis biscutatus ( Geoffroy Saint-Hilaire, 1809) View in CoL

( Figure 8A View Figure 8 )

Pimelodus biscutatus Geoffroy Saint-Hilaire 1809

Auchenoglanis senegali Retzer 2010 View in CoL

Material examined

Holotype. MNHN 8969 About MNHN : Nile; 285 mm SL.

Other material. Specimens are listed per river basin (from west to east).

Senegal basin . MRAC 79-2-P-211 (holotype of A. senegalensis ): camp Djoudj, Gorom River, Senegal; 16 ◦ 22 ′ N, 16 ◦ 16 ′ W; 156 mm SL. MRAC 79-2-P-212–214 (paratypes of A. senegalensis ): same locality; 3 spm, 152–171 mm SL. MRAC 80-1-P-99: same locality; 217 mm SL. MRAC 73-5-P-2814 (paratype of A. senegalensis ): Mbane, Lac de Guiers, Senegal; 16 ◦ 16 ′ N, 15 ◦ 48 ′ W; 117 mm SL.

Gambia basin . MRAC 81-3-P-381 (paratype of A. senegalensis ): Ba-Foula-Bé, Gambia River, Senegal; 13 ◦ 02 ′ N, 13 ◦ 12 ′ W; 154 mm SL.

Niger basin . MRAC 73-12 View Materials -P-366: Mopti Nord (chenal domestique), Niger River, Mali; 14 ◦ 30 ′ N, 4 ◦ 12 ′ W; 160 mm SL . MRAC 73-12 View Materials -P-367–368: Mopti Sud (aval grille), Niger River, Mali; c.14 ◦ 30 ′ N, 4 ◦ 12 ′ W; 2 spm, 156–160 mm SL . MRAC 91-67 View Materials -P- 161: Okoso Creek (sandy floodplain channel), Niger River, Nigeria; 5 ◦ 08 ′ N, 6 ◦ 23 ′ E; 180 mm SL . MRAC 73-15 View Materials -P-995–998: Garoua , Benoué River, Cameroon; 9 ◦ 18 ′ N, 13 ◦ 24 ′ E; 4 spm, 161–179 mm SL .

Chad basin . MRAC 153906–907 View Materials : Bahr-Sara, mouth of Mandoul River , Chad; c.08 ◦ 20 ′ N, 17 ◦ 46 ′ E; 2 spm, 133–145 mm SL. MRAC 154048–154050 View Materials : Bahr-Tinga, Parc de Zakouma , Chad; c.10 ◦ 50 ′ N, 19 ◦ 45 ′ E; 3 spm, 145–216 mm SL. MRAC 154094 View Materials : Fort Archambault, Chari River , Chad; 9 ◦ 09 ′ N, 18 ◦ 23 ′ E; 156 mm SL. MRAC 154174–175 View Materials : Lake Iro, Chari River , Chad; 10 ◦ 09 ′ N, 19 ◦ 23 ′ E; 2 spm, 171–214 mm SL. MRAC 19980 View Materials : Soueram , Chad; c.12 ◦ 28 ′ N, 14 ◦ 11 ′ E; 144 mm SL. MRAC 73- 26 View Materials -P-545–546: south of Hollom , Chad; c.11 ◦ 19 ′ N, 15 ◦ 04 ′ E; 2 spm, 211–223 mm SL. MRAC 73-15 View Materials -P-999–1000: Waza (bought) , Cameroon; 11 ◦ 24 ′ N, 14 ◦ 34 ′ E; 2 spm, 137–149 mm SL. MRAC 73-15 View Materials -P-989–991: Guemé, Logone River , Cameroon; 10 ◦ 30 ′ N, 15 ◦ 11 ′ E; 2 spm, 111–176 mm SL. MRAC 73-15 View Materials -P-992: same locality; 199 mm SL. MRAC 73-15 View Materials -P-994: same locality; 154 mm SL. MRAC 73-16 View Materials -P-5488: Yagoua, Logone River (bought) , Cameroon; 10 ◦ 21 ′ N, 15 ◦ 17 ′ E; 203 mm SL.

Diagnosis

Auchenoglanis biscutatus can be diagnosed from A. occidentalis by the large horizontal distance between the eye and the end of the supraoccipital process, being larger than the horizontal distance between the snout tip and the eye (104% or more; Figure 1C View Figure 1 ). Its adipose fin rises abruptly (versus very gradually). The tip of the maxillary barbel is not darker than the head.

Description

Head deep, with short, slightly pointed snout. Maxillary barbel always reaching eye, or even beyond it. Adipose fin high, at 8–12% SL. Branchiostegal membranes not fused; 9–10(11) branchiostegal rays. Width of premaxillary tooth plate 5–7% HL; both plates touching or not. Minimal caudal peduncle depth 11.5–13% SL. Dorsal fin with one rudimentary and one long spine, and 7 branched rays. Pectoral fin with spine and 8–10 branched rays, pelvic fin with 6 rays (5 branched), anal fin with 9–13 rays.

Colouration

Adults often uniformly brownish. Pigmentation degree variable, on average lighter than in A. occidentalis . Pattern, if present, consisting of darker spots, often in rows on the flanks, sometimes confluent in (marbled) juveniles, more rarely consisting of larger reticulate spots. Fins often with (smaller) dots.

Maximum size recorded

540 mm SL.

Distribution

West African rivers from Senegal to Chad basins, and more east in the Nile and Lake Turkana basins ( Figure 9 View Figure 9 ). Appears nowhere to be very numerous.

MRAC

Musée Royal de l’Afrique Centrale

Kingdom

Animalia

Phylum

Chordata

Class

Actinopterygii

Order

Siluriformes

Family

Claroteidae

Genus

Auchenoglanis

Loc

Auchenoglanis biscutatus ( Geoffroy Saint-Hilaire, 1809 )

Geerinckx, Tom & Vreven, Emmanuel 2013
2013
Loc

Auchenoglanis senegali

Retzer 2010
2010
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