Description of two new miniature species of Hylopanchax PollLambert, 1965 (Cyprinodontiformes: Procatopodidae), from northeastern Gabon, with an updated diagnosis of the genus based on morphology, colouration and osteology
| Autor: | Emmanuel Vreven, Rainer Sonnenberg, Pedro H. N. Bragança, Jouke R. Van der Zee |
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| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Male Scale (anatomy) Aquatic Science Biology 010603 evolutionary biology 01 natural sciences Bone and Bones Specimen Handling Cyprinodontiformes Reticulate Osteology Rivers Species Specificity Genus Animals Gabon Endemism Ecology Evolution Behavior and Systematics Skin Hypsopanchax Pigmentation 010604 marine biology & hydrobiology Anatomy biology.organism_classification Spine Female Black spot |
| Zdroj: | Journal of fish biologyREFERENCES. 98(3) |
| ISSN: | 1095-8649 |
| Popis: | 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, new species, 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, new species, is distinguished from all other congeners, except H. paucisquamatus, by having (30 vs. 31-33 vertebrae) and is further distinguished from H. multisquamatus, new species, by having 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 is provided based on external morphology, colouration pattern, and osteology. An osteological comparison with closely related species belonging to the genera Procatopus, Hypsopanchax and 'Hypsopanchax' is presented. The presence of (i) a truncate and slightly downwards directed anterior process of the angulo-articular and (ii) a guitar-shaped lachrymal with both its anterior and posterior margins sharply curved are herein considered as diagnostic features of Hylopanchax. This article is protected by copyright. All rights reserved. |
| Databáze: | OpenAIRE |
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