Elasmobranchii (sharks and rays) > Carcharhiniformes
(Ground sharks) > Pentanchidae
Etymology: Apristurus: a-, Latin privative, i.e., without; pristis, from pristes (Gr.), sawyer (but here meaning saw); oura (Gr.), tail, referring to absence of saw-toothed crest of enlarged dermal denticles along upper edge of caudal fin as found in the closely related Pristiurus (=Galeus). (See ETYFish); ampliceps: amplus (L.), large; ceps (New Latin), head, 21.8-25.5% TL). (See ETYFish).
Environment: milieu / climate zone / depth range / distribution range
Marine; bathydemersal; depth range 800 - 1503 m (Ref. 76941). Temperate
Southwest Pacific: New Zealand and Australia.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 85.5 cm TL male/unsexed; (Ref. 76941); 79.6 cm TL (female)
Morphology | Morphometrics
This species has the following characters: upper labial furrows about equal to, or slightly shorter than the lower ones; length of pre-outer nostril 4.5-6.6% TL; semicircular upper jaw; continuous supraorbital sensory canal; first dorsal fin is slightly smaller than second; anal fin is rounded in shape; narrow dermal denticles, leaf-like and sparse in distribution; enlarged dermal denticles absent along the dorsal margin of caudal fin; 8-11 spiral valves in intestine; size at maturity 65.0-75.0 cm TL; uniformly brown or blackish brown body and fins (Ref. 76941).
Claspers of males are short and less than 2.0% TL in specimens less than 52.7 cm TL, which is ranked as maturity stage 1 (immature); 73.3-76.5 cm TL have long but soft claspers (3.9-4.2% TL, maturity stage 2; greater than 78 cm TL have long, well developed and hardened
claspers (3.6-5.6% TL, maturity stage 3). Immature males are less than 52.7 cm TL and for females 37.4 cm TL (maturity stage 1); adolescent in males of 73.3-76.5 cm TL and females of 57.8-65.6 cm TL are (maturity stage 2); and adult in males with greater than 78 cm TL and females greater than 67.8 cm TL (maturity stage 3) (Ref. 76941).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Sasahara, R., K. Sato and K. Nakaya, 2008. A new species of deepwater catshark, Apristurus ampliceps sp. nov., (Chondrichthyes: Carcharhiniformes: Scyliorhinidae), from New Zealand and Australia. In Last, P.R., White, W.T. & Pogonoski, J.J. (eds.): Descriptions of New Australian Chondrichthyans. CSIRO Marine and Atmospheric Research Paper no. 22. (Ref. 76941)
IUCN Red List Status (Ref. 125652)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Preferred temperature (Ref. 123201
): 3.5 - 6.4, mean 4.6 °C (based on 20 cells).
Phylogenetic diversity index (Ref. 82804
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00355 (0.00173 - 0.00727), b=3.08 (2.90 - 3.26), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic level (Ref. 69278
): 4.0 ±0.4 se; based on size and trophs of closest relatives
Resilience (Ref. 120179
): Very Low, minimum population doubling time more than 14 years (Fec assumed to be < 10).
Fishing Vulnerability (Ref. 59153
): Moderate to high vulnerability (54 of 100).