| Main Ref. | Daget, J., 2003 |
| Utseende refererar till | |
| Bones in OsteoBase |
| specialiserade organ | |
| annat utseende | |
| andra färger | |
| Anmärkningar |
| Särskilt slående egenskaper | |
| Lateral kroppsform (shape guide) | eel-like |
| Tvärsnitt | |
| Dorsal profil av huvudet | |
| Ögontyp | |
| Typ av mun/snyte | |
| Munnens placering | |
| Type of scales | |
| Diagnos |
Diagnosis: body naked, elongated, cylindrical in front and strongly compressed back; caudal part of body making less than one third of the total length and ending in a blunt point; no paired fins; dorsal and anal fins reduced to a skin fold, rayless, meeting the caudal fin; eyes small, overlaid with skin, situated at the head forward; mouth large with well developed lips; conical teeth to the jaws and the palate; gill opening reduced to a medio-ventral transversal slit; branchiostegal membrane free from isthmus; 4 branchial arches with well developed branchiae; lateral line present; vertebral count: 80 abdominal and 50 caudal (Ref. 57291). Colouration: adults are dark-coloured, nearly black, juveniles are clearer (Ref. 57291). |
| Ease of Identification |
| Sidolinjer | avbruten: No |
| Fjäll längs sidolinje | |
| Porbärande fjäll längs sidolinje | |
| Fjäll i lateralserie | |
| Antal rader fjäll ovan sidolinje | |
| Antal rader fjäll under sidolinje | |
| Fjäll runt stjärtfensspole | |
| Skäggtömmar | |
| Gälspringor (endast hos hajar/rockor) | |
| Gälräfständer | |
| på undre del av gälbåge | |
| på övre del av gälbåge | |
| totalt | |
| Ryggkotor | |
| preanal | |
| totalt |
| Egenskaper | greatly reduced or absent |
| Antal fenor | 1 |
| Antal småfenor | Dorsal |
| Ventral | |
| Totalt antal hårda fenstrålar | 0 - 0 |
| Totalt antal mjuka fenstrålar | 0 - 0 |
| Fettfena | absent |
| Egenskaper | pointed; confluent |
| Antal fenor | 1 |
| Totalt antal hårda fenstrålar | 0 - 0 |
| Totalt antal mjuka fenstrålar | 0 - 0 |
| Bröstfena | Egenskaper absent |
| Fenstrålar hårda | |
| Fenstrålar mjuka | |
| Bukfenor | Egenskaper suppressed/absent |
| Position | |
| Fenstrålar hårda | |
| Fenstrålar mjuka |