Eptatretus wisneri 


Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Myxini Myxiniformes Myxinidae

Scientific Name: Eptatretus wisneri
Species Authority: McMillan, 1999

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2013
Date Assessed: 2009-11-11
Assessor(s): Mincarone, M.M.
Reviewer(s): Polidoro, B., Knapp, L. & Carpenter, K.E.
This species is known only by two museum specimens and is likely endemic to Galápagos Archipelago. It is likely a deepwater species, as specimens were recorded between 512 and 563 m. There are no known threats likely to affect this species, given its deep water habitat. It is also found entirely within the Galápagos Marine Protected Area. It is listed as Least Concern. However, more research is needed on this species population, biology, life history, and potential threats.

Geographic Range [top]

Range Description: This species is found within the Galápagos Archipelago, west of Fernandina Island (McMillan 1999).
Countries occurrence:
Ecuador (Galápagos)
FAO Marine Fishing Areas:
Pacific – southeast
Lower depth limit (metres): 563
Upper depth limit (metres): 512
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The population of this species is only known from two type specimens.
Current Population Trend: Unknown
Additional data:
Population severely fragmented: No

Habitat and Ecology [top]

Habitat and Ecology: This species is found on the slope at depths from 512-563 m. The holotype is a 356 mm juvenile female with round eggs of less than 1 mm, with no ellipsoidal oocytes. The paratype is a 328 mm male with well-developed testes (McMillan 1999).

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).
Systems: Marine

Threats [top]

Major Threat(s): There are no known threats to this species.

Conservation Actions [top]

Conservation Actions: This species is found within Galápagos Marine Reserve so it is potentially safeguarded through enforcement activities. More research needed on its biology, population size, distribution and potential threats.

Citation: Mincarone, M.M. 2013. Eptatretus wisneri. The IUCN Red List of Threatened Species 2013: e.T196047A8997757. . Downloaded on 29 November 2015.
Disclaimer: To make use of this information, please check the <Terms of Use>.
Feedback: If you see any errors or have any questions or suggestions on what is shown on this page, please provide us with feedback so that we can correct or extend the information provided