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Paul V. Loiselle (2)

Description: Dorsal spines (total): 2; Dorsal soft rays (total): 7; Anal spines: 0; Anal soft rays: 11 - 12; Vertebrae: 43 - 44. Gogo atratus is distinguished from congeners in having a longer snout, 54.8-56.4% of head length vs. 47.1-54.3%; and faintly mottled dark gray colouration vs. uniform brown, highly mottled dark gray and cream, or mottled brownish-gray. It further differs from Gogo ornatus in having a larger eye in specimens larger than 110 mm standard length, eye diameter 13.0-14.3% of head length vs. 9.2-12.5% (Ref. 75790). It differs from G. brevibarbis in having unicuspid teeth vs. bicuspid, and a smaller eye, eye diameter 13.0-14.3% of head length vs. 19.5%. It differs from G. arcuatus in having a narrower head, head width 17.8-18.9% of standard length vs. 20.8-21.0% and interorbital distance 28.9-30.5% of head length vs. 34.8-35.1%; smaller eye, eye diameter 13.0-14.3% of head length vs. 17.7-18.6%; shorter dorsal spine, 17.7-20.6% of standard length vs. 21.2-21.8%; shorter pectoral spine, 16.5-18.9% of standard length vs. 19.9-20.2%; and a straight dorsoposterior margin of the dorsal fin vs. concave. Habitat: G. atratus is found over an open sand/cobble bottom interspersed with scattered rocky ourcroppings at a depth of less than 1 m; the water is clear, with the bottom consisting of either sand or rock/cobble; the bottom is lightly overlain with leaf litter in quieter stretches of the river. Remarks: Gogo atratus is only known from the two collection sites of the type series in the Lower Mananara du Nord River in northeastern Madagascar. These two sites are located approximately 7 km from each other. It is not possible to adequately assess the risk of extinction of this species because there is not enough information available on the distribution and/or population status of this species, nor on plausible threats. Far more survey work in the region is required before this species can be accurately assessed. This anchariid catfish is therefore listed as Data Deficient (IUCN).

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Anchariidae

Africa: Mananara du Nord River drainage in northeastern Madagascar. Type Locality: Main channel of Mananara River at Antonibaolina village, Mananara du Nord drainage, 16°18'47.4''S, 49°39'52.2''E, Toamasina Province, Madagascar, elevation 108 meters.

17.0cm. (6¾ins)

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FishBase team RMCA & Sparks, J.S. 2016. Gogo atratus. The IUCN Red List of Threatened Species 2016.
Froese, R. and D. Pauly. Editors. 2019.FishBase. World Wide Web electronic publication. www.fishbase.org, ( 08/2019 ).
IUCN. 2016. The IUCN Red List of Threatened Species. Version 2016-3. Available at: www.iucnredlist.org.
Ng, H.H., J.S. Sparks and P.V. Loiselle, 2008. A new species of catfish of the genus Gogo from the Northeastern Madagascar (Siluriformes: Anchariidae). Copeia 2008(2):395-400.