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Elasmobranchii (sharks and rays) > Torpediniformes (Electric rays) > Narkidae (Sleeper rays)
Etymology: Typhlonarke: Greek, typhlops = blind + Greek, narke = numbness (Ref. 45335).
Eponymy: Lake Falconer Ayson (1855–1927) gave the holotype to its describer after the vessel ‘Doto’ trawled it up on a research cruise, of which Ayson was the leader. [...] (Ref. 128868), visit book page.

Environment: milieu / climate zone / depth range / distribution range Ecology

Marine; bathydemersal; depth range 65 - 900 m (Ref. 26346), usually 300 - 400 m (Ref. 114953). Deep-water; 42°S - 47°S, 169°E - 176°E (Ref. 114953)

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Southwest Pacific: endemic to New Zealand.

Size / Weight / Age

Maturity: L_m ? range ? - ? cm
Max length : 45.0 cm TL male/unsexed; (Ref. 114953)

Short description Identification keys | Morphology | Morphometrics

Anal spines: 0. Dark brown dorsally, light brown ventrally (Ref. 26346).

Found on the continental shelf and slope (Ref. 26346). Produces up to 11 pups a litter. Males reaches maturity at 35-40 cm TL; birth size at 9-10 cm TL (Ref. 114953).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Presumably ovoviviparous, with up to 11 young born at 9-10 cm (Ref. 26346).

Main reference Upload your references | References | Coordinator : Carvalho, Marcelo | Collaborators

Cox, G. and M. Francis, 1997. Sharks and rays of New Zealand. Canterbury Univ. Press, Univ. of Canterbury. 68 p. (Ref. 26346)

IUCN Red List Status (Ref. 130435: Version 2024-1)

Least Concern (LC) ; Date assessed: 22 June 2017

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

Harmless

Human uses

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Estimates based on models

Phylogenetic diversity index (Ref. 82804): PD₅₀ = 0.7502 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.01000 (0.00244 - 0.04107), b=3.04 (2.81 - 3.27), in cm total length, based on all LWR estimates for this body shape (Ref. 93245).

Trophic level (Ref. 69278): 3.3 ±0.3 se; based on size and trophs of closest relatives

Resilience (Ref. 120179): Low, minimum population doubling time 4.5 - 14 years (Assuming fecundity<100).

Fishing Vulnerability (Ref. 59153): Low to moderate vulnerability (35 of 100).

Typhlonarke aysoni (Hamilton, 1902)