| Family: |
Somniosidae (Sleeper sharks) |
| Max. size: |
14.7 cm TL (male/unsexed); 13.58 cm TL (female) |
| Environment: |
bathydemersal; marine; depth range - 500 m |
| Distribution: |
Northwest Pacific: Taiwan. |
| Diagnosis: |
Vertebrae: 75-79. This species is distinguished from its congeners by the following set of characters: no anal fin; two spineless dorsal fins, first dorsal fin higher and larger than second dorsal fin; short lateral keels on the caudal peduncle, precaudal pits absent; caudal fin is asymmetrical and paddle-shaped, with a relatively short upper lobe and long lower lobe; rhomboid-shaped dermal denticles; teeth dissimilar in upper and lower jaws, upper-jaw teeth small with lanceolate, in 72 rows, lower-jaw teeth semioblique with low roots, in 28 rows; precaudal vertebrae 60-61, caudal vertebrae 15-18, total 75-78; number of turns in spiral valve 25-26 In mid-term embryo stage (12.8-15.0 cm TL); no teeth and dermal denticles; sexes identifiable; caudal keel present. Colouration: body light brown to yellow-grayish (Ref. 123759). |
| Biology: |
This species was collected in canyons surrounded by deep-sea longliner off eastern Taiwan at a depth greater than 500 m (Ref. 123759). |
| IUCN Red List Status: |
Data deficient (DD); Date assessed: 06 March 2022 Ref. (130435)
|
| Threat to humans: |
harmless |
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