Longfinned Cuskeel, Sciadonus longiventralis Nielsen 2018

Holotype of Sciadonus longiventralis, NMV A 5672, male, 70 mm SL. Source: Marcus Krag, Fig. 13, in Nielsen et al. (2019) Zootaxa 4564(2): 554–572. License: All rights reserved

A slender live-bearing cusk with loose, scaleless, transparent skin showing the internal organs, small, black, deep-set eyes, a horizontal mouth with a protruding lower jaw and a distinct pair of tissue flaps on the tip of the lower jaw.

Cite this page as:
Bray, D.J. 2022, Sciadonus longiventralis in Fishes of Australia, accessed 03 Dec 2023, https://fishesofaustralia.net.au/Home/species/5414

Longfinned Cuskeel, Sciadonus longiventralis Nielsen 2018

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Off Newcastle, New South Wales and on the Lord Howe Rise in the Australian EEZ.


Dorsal fin 87; Anal fin 52; Pectoral fin 14; Vertebrae total 80, precaudal 39.. 
Body slender, compressed with loose, scaleless, transparent skin showing the inner organs. Mouth horizontal; lower jaw protruding with a distinct pair of tissue flaps on tip; anterior nostril with skin-flap, posterior nostril a mere hole. Pelvic fin rays long, 3.5% SL; predorsal length 28.5% SL. 


Fertilisation is internal and females give birth to live young.


The specific name longiventralis is from the Latin longus (= long) and ventralis (= ventral), in reference to the long ventral (or pelvic) fins of this species.

Species Citation

Sciadonus longiventralis Nielsen 2018, Cybium 42(2): 182, Figs. 6-7. Type locality: Off New South Wales, 35°0.00'S - 34°54.42'S, 151°16.30'E - 151°13.36'E, depth 1100 m.


Bray, D.J. 2022


Atlas of Living Australia

Longfinned Cuskeel, Sciadonus longiventralis Nielsen 2018


Nielsen, J.G. 2018. Revision of the cosmopolitan deep-sea genus Sciadonus (Teleostei, Bythitidae) with two new species. Cybium 42(2): 177-187. See ref online

Nielsen, J. G., Pogonoski, J.J. & Appleyard, S.A. 2019. Aphyonid-clade species of Australia (Teleostei, Bythitidae) with four species new to Australian waters and a new species of Barathronus. Zootaxa 4564(2): 554-572. http://dx.doi.org/10.11646/zootaxa.4564.2.12

Williams, A. 2020. Sciadonus longiventralis. The IUCN Red List of Threatened Species 2020: e.T135443253A137454661. https://dx.doi.org/10.2305/IUCN.UK.2020-1.RLTS.T135443253A137454661.en. Accessed on 08 October 202

Quick Facts

CAAB Code:37228129

Conservation:IUCN Data Deficient

Depth:1100 m


Max Size:7 cm SL


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