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

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.Original Abstract: Akihito vanuatu, un nouveau genre et nouvelle espece de gobie (Sicydiinae) du Pacifique sud. La sous-famille des Sicydiinae est divisee en deux tribus fondees sur des caracteristiques osteologiques des nageoires. La tribu des Sicydiini Gill, 1860 est definie comme ayant un disque pelvien a base large et fusionne a l'abdomen entre chacun des cinq rayons. La tribu des Sicyopini, nouvelle tribu, est definie comme ayant un disque pelvien a base etroite fusionne a l'abdomen entre les cinquiemes rayons uniquement. Akihito n. gen., Sicyopini, est decrit sur la base de materiel collecte dans les rivieres du Vanuatu. Akihito n. gen. se differencie des autres genres de Sicydiinae par la combinaison des caracteristiques suivantes : male avec seulement des dents premaxillaires et dentaires coniques et caniniformes ; femelle avec quelques dents premaxillaires caniniformes et de nombreuses dents tricuspides, ainsi que de fines dents horizontales sur le dentaire ; langue libre ; epural grand et large ; male avec des ecailles laterales plus hautes que larges ; disque pelvien a base et