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  Description of two new miniature species of Hylopanchax Poll & Lambert, 1965 (Cyprinodontiformes: Procatopodidae), from northeastern Gabon, with an updated diagnosis of the genus based on morphology, colouration and osteology

Bragança, P. H. N., van der Zee, J. R., Sonnenberg, R., & Vreven, E. J. W. M. N. (2020). Description of two new miniature species of Hylopanchax Poll & Lambert, 1965 (Cyprinodontiformes: Procatopodidae), from northeastern Gabon, with an updated diagnosis of the genus based on morphology, colouration and osteology. Journal of Fish Biology, 1-13. doi:10.1111/jfb.14606.

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Bragança, Pedro H. N., Author
van der Zee, Jouke R., Author
Sonnenberg, Rainer1, Author              
Vreven, Emmanuel J. W. M. N., Author
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1Department Evolutionary Genetics, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445635              

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Free keywords: Congo, endemism, the Ivindo River, killifish, lampeyes, Ogowe River drainage
 Abstract: Abstract Two new species of the lampeye genus Hylopanchax are described from the Ivindo River basin in the Ogowe River drainage. Hylopanchax multisquamatus, new species, and Hylopanchax thysi, new species, differ from congeners by the presence of a hyaline urogenital male papilla with small black spots and a dark-brown reticulate pattern on the flanks of both males and females in preserved specimens. Hylopanchax multisquamatus is distinguished from congeners by the number of scales on the mid-longitudinal series (27?30 vs. 19?26, respectively) and by the relative anterior/posterior flank scale depth ratio (140%?150% vs. 170%?220%). Hylopanchax thysi is distinguished from all other congeners, except Hylopanchax paucisquamatus, by the presence of vertebrae (30 vs. 31?33) and is further distinguished from H. multisquamatus by the presence of a deeper caudal peduncle and much larger anterior flank scales. It is distinguished from H. paucisquamatus by the presence of a hyaline urogenital male papilla with small black spots and a dark-brown reticulate pattern on the flanks of both males and females in preserved specimens. Osteological data of Hylopanchax are presented for the first time, and an updated diagnosis based on external morphology, colouration pattern and osteology is provided. An osteological comparison with closely related species belonging to the genera Procatopus, Hypsopanchax and ?Hypsopanchax? is presented. (a) A truncate and slightly downward-directed anterior process of the angulo-articular and (b) a guitar-shaped lachrymal with both its anterior and posterior margins sharply curved are here considered as diagnostic features of Hylopanchax.

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Language(s): eng - English
 Dates: 2020-10-152020-08-052020-10-192020-11-13
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1111/jfb.14606
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Project name : Capes
Grant ID : 99999.003613/2015‐01
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Title: Journal of Fish Biology
Source Genre: Journal
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Publ. Info: London : Academic Press
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 1 - 13 Identifier: ISSN: 0022-1112
CoNE: https://pure.mpg.de/cone/journals/resource/954922645036