Elasmobranchii (sharks and rays) > Carcharhiniformes
(Ground sharks) > Pentanchidae
Etymology: Apristurus: Greek, a = without + Greek, pristis = saw + Greek, oura = tail (Ref. 45335); nakayai: The epithet nakayai, is in honour of the Japanese ichthylogist Kazuhiro Nakaya that dedicate his research to the taxonomy of this genus, describing eight species of Apristurus and revising the genus worldwide (Nakaya, 2009). Vernacular English name "Milk-eye catshark" and French name "Holbiche à iris blanc" refer to the white iris of the species, unique among Apristurus (Ref. 93246).
Environment: milieu / climate zone / depth range / distribution range
Marine; bathypelagic; depth range 953 - 1022 m (Ref. 93246). Deep-water; 21°S - 22°S, 157°E - 158°E (Ref. 93246)
Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri
Pacific Ocean: New Caledonia.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 67.6 cm TL male/unsexed; (Ref. 93246)
Morphology | Morphometrics
A medium-sized species of Apristurus of the brunneus group with the following combination of characters: shiny white iris on fresh specimen; brownish black colouration; short interspace from P1 free rear tip to P2 origin, subequal to internarial width; midpoint of the total length located well behind cloaca; pectoral fins large, width about 2.7 times P1 tip-P2 origin; long anal-fin base, longer than D1 insertion-D2 insertions; first dorsal fin located well behind pelvic-fin insertion; first dorsal fin markedly smaller than second one; long caudal fin terminal lobe, its length more than twice its height; no denticles in the mouth; very short pyloric stomach; intestinal spiral valves 16; monospondylous vertebrae 36; precaudal diplospondylous vertebrae 37 (Ref. 92346).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Iglésias, S.P., 2012. Apristurus nakayai sp. nov., a new species of deepwater catshark (Chondrichthyes: Pentanchidae) from New Caledonia. Cybium 36(4):511-519. (Ref. 93246)
IUCN Red List Status (Ref. 123251)
CITES (Ref. 123416)
Threat to humans
CountriesFAO areasEcosystemsOccurrencesIntroductionsStocksEcologyDietFood itemsFood consumptionRation
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00316 (0.00148 - 0.00675), b=3.09 (2.90 - 3.28), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic level (Ref. 69278
): 3.9 ±0.4 se; based on size and trophs of closest relatives
Vulnerability (Ref. 59153
): Moderate to high vulnerability (49 of 100) .