Akihito vanuatu, a new genus and new species of freshwater goby (Sicydiinae) from the South Pacific

Watson R.E., Keith P., Marquet G.

Date de parution: septembre 2007
Volume: 31
Number: 3
Pagination: 341-349
Editeur: Société Française d'Ichtyologie
doi: https://doi.org/10.26028/cybium/2007-313-003
Résumé

Based on characteristics of fin osteology, subfamily Sicydiinae is divided into two tribes. Sicydiini Gill, 1860 is defined as having a broad based pelvic disc, fused to belly between all 5 rays and Sicyopini, new tribe, is defined as having a short based pelvic disc, fused to belly between fifth rays only. Akihito n. gen., Sicyopini, is described based on material collected in freshwater streams in the island nation of Vanuatu. Akihito n. gen. is differentiated from all other genera in Sicydiinae by a combination of characteristics that include male with only conical and caniniform premaxillary and dentary teeth, female with few caniniform and numerous tricuspid premaxillary teeth and fine horizontal teeth in dentary; tongue free; large broad epural; male with midline scales much greater in height than length; and pelvic disc fused to belly between fifth rays only. Akihito vanuatu n. sp. is characterized by dorsal fins VI-I,10, spines 4, 5 and 6 filamentous in male and not in female; anal fin I,10; pectoral fin usually 16 (15-17); scales in lateral series: male 14-18, female 24-32; predorsal scales: male zero, female 0-2; belly: male naked and female with few cycloid scales close to anus; cephalic sensory pores usually A, B, C, D, F, H, N and O, pores K and L and associated posterior oculoscapular canal not usually present, all pores paired except pore D which is singular.

Mots-clés: Akihito vanuatu - freshwater - Gobioidei - New genus - New species - PSE - Sicydiinae - Vanuatu
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