|Scientific Name:||Eptatretus eos|
|Species Authority:||Fernholm, 1991|
|Red List Category & Criteria:||Data Deficient ver 3.1|
|Reviewer(s):||Polidoro, B., Knapp, L. & Carpenter, K.E.|
This species is known only from a single specimen in the Tasmanian Sea. More research is needed to determine this species distribution, population, habitat, ecology and any major threats. It is therefore listed as Data Deficient.
|Range Description:||This species is known only from the type locality in the Tasman Sea, west of New Zealand, 39°47.7-50.3'S, 167°15.7-13.5'E.|
|FAO Marine Fishing Areas:||
Pacific – southwest
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||Only the holotype is known.|
|Habitat and Ecology:||
This species' habitat is probably on hard-coral reef bottoms, at depths from 991-1,013 m (Fernholm 1991, Fernholm and Quattrini 2008). The unique specimen known (665 mm total length (TL)) was collected in the trawl fishery for the holacanthid Hoplostethus atlanticus on Westpack bank, Western Challenger Plateau, Tasman Sea. According to Fernholm (1991), an alert was put out to scientists and fisheries observers in the area to try to acquire more specimens, but after more than one year no additional material was collected.
The copulatory organ is absent in this species. The gonads of hagfishes are situated in the peritoneal cavity. The ovary is found in the anterior portion of the gonad, and the testis is found in the posterior part. The animal becomes female if the cranial part of the gonad develops or male if the caudal part undergoes differentiation. If none develops, then the animal becomes sterile. If both anterior and posterior parts develop, then the animal becomes a functional hermaphrodite. However, hermaphroditism being characterised as functional needs to be validated by more reproduction studies (Patzner 1998).
|Major Threat(s):||There is no information known on type and scale of threats.|
|Conservation Actions:||There are no conservation measures in place, but more research is needed on species' biology, population size, distribution and impacts.|
Fernholm, B. 1991. Eptatretus eos: a new species of hagfish (Myxinidae) from the Tasman Sea. Japanese Journal of Ichthyology 38(2): 115-118.
Fernholm, B. and Quattrini, A.M. 2008. A new species of hagfish (Myxinidae: Eptatretus) associated with deep-sea coral habitat in the western North Atlantic. Copeia 1: 126-132.
IUCN. 2011. IUCN Red List of Threatened Species (ver. 2011.1). Available at: http://www.iucnredlist.org. (Accessed: 16 June 2011).
Patzner, R.A. 1998. Gonads and reproduction in hagfishes. In: J.M. Jørgensen, J.P. Lomholt, R.E. Weber, and H. Malte (eds), The biology of hagfishes, pp. 378-395. Chapman & Hall, London.
|Citation:||Mincarone, M.M. 2013. Eptatretus eos. The IUCN Red List of Threatened Species. Version 2015.2. <www.iucnredlist.org>. Downloaded on 02 August 2015.|
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