TitleNew genus and species of seven-spined goby (Gobiidae: Gobiosomini) from the offing of the Amazon River, Brazil
Publication TypeJournal Article
Year of Publication1995
AuthorsBirdsong RS, Robins RC
KeywordsAnatomy and Histology - Comparative anatomy 62510, Animal distribution -, Chordata: general and systematic - Pisces 62800, General biology - Taxonomy, nomenclature and terminology 11103, Organisms [00500] Osteichthyes [85206] Population Studies Biogeography General Life Studies Morphology Systematics and Taxonomy Organisms Pisces Vertebrata Chordata Animalia 00504
AbstractAkko dionea, a new genus and species of gobiid fish, is described from the shelf waters of Brazil just northeast of the mouth of the Amazon River. It is a member of the Gobiosomini, an endemic American tribe with which it shares two synapomorphies: a 3-221110 dorsal pterygiophore formula and 11 precaudal vertebrae. Within this tribe, its relationships are obscured by a large number of autapomorphic features, some unknown in any other gobiids. The osteology of the head, pectoral and pelvic girdles, and the caudal region are described along with certain aspects of the cranial and girdle myology. The arrangement of sensory papillae is illustrated. The species lacks head pores. Parallelism in structures with other unrelated gobies are believed to reflect adaptations to life on a soft mud bottom. Alepidoeleotris tigris Herre is synonymized with Eleotrica cableae Gingburg, and Cayennia Savage is synonymized with Gobioides Lacepede.

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