Ref. principal | Bruton, M.N., 1991 |
Aparência se refere a | macho; fêmea |
Bones in OsteoBase |
órgãos especializados | |
Aparência diferente | |
Cores diferentes | |
Notas |
Características determinantes | |
Forma lateral do corpo | fusiform / normal |
Seção transversal | |
Perfil dorsal da cabeça | |
Tipo de olhos | more or less normal |
Tipo de boca/focinho | more or less normal |
Posição da boca | terminal |
Type of scales | cosmoid scales |
Diagnose |
This species have the following characters: D VIII+30-31; A 27-31; P 29-32; V 29-33; C 20-25/35-38/21-22; LL 94-104; gills 4; gill rakers replaced by spiny tooth-plates. Head naked, the opercular bones exposed; gill cover expanded posteriorly and ventrally as a thick flap of skin; lower jaw with two large, overlapping gular plates; teeth conical, set on bony plates attached to palatines, ectopterygoids, and dentaries; maxilla absent (the structure at the side of the upper jaw that appears to be a maxillary bone is a thick fold of skin connecting the upper jaw to the rear of the lower jaw). Swim bladder elongate, filled with fat; intestine with spiral valve; osmoregulation involves retention of urea and trimethylamine oxide in the blood, but urea is not resorbed by the kidneys and excess salts are excreted by the rectal gland. In adults the brain is incredibly small, occupying only about 1% of the cranial cavity; but in the smallest juveniles, the brain completely fills the cranial cavity. Color in life: dark metallic blue, the head and body covered with irregular white or pale bluish spots. After death, the bluish color fades to dark brownish black. |
Facilidade de Identificação | easy to distinguish from other species. |
Linhas laterais | 1 Interrompido(a): No |
Escamas na linha lateral | 76 - 82 |
Escamas da linha lateral com poros | |
Escamas em séries laterais | |
Fileiras de escamas acima da linha lateral | |
Fileiras de escamas abaixo da linha lateral | |
Escamas em torno do pedúnculo caudal | |
Barbilhões | 0 |
Aberturas branquiais (tubarões/raias apenas) | |
Rastros branquiais | |
no membro inferior | |
no membro superior | |
total | |
Vértebras | |
Pré-anal | |
total |
Atributos | other |
Número de nadadeiras | 2 |
Nro. de pínulas | Dorsal 0 - 0 |
Ventral 0 - 0 | |
Total de espinhos | 8 - 8 |
Total de raios | 30 - 31 |
Nadadeira adiposa | absent |
Atributos | more or less truncate |
Número de nadadeiras | 1 |
Total de espinhos | 0 - 0 |
Total de raios | 27 - 31 |
Peitoral | Atributos more or less normal |
espinhos 0 | |
raios 29 - 32 | |
Pélvicas | Atributos other (see diagnosis) |
Posição abdominal behind origin of D1 | |
espinhos 0 | |
raios 29 - 33 |