Metadata

Schistura oedipus

(Kottelat, 1988) Kottelat 1990

Schistura oedipus
Schistura oedipus pink morph. Photograph by Paul Loiselle.
ORDERSUB-ORDERFAMILY
CypriniformesCobitoidei Nemacheilidae

Synonyms

Nemacheilus oedipus  Kottelat 1988

Country

Thailand

Types

Holotype: AMS I.25986‑002 70.4mm SL. Paratype: AMS I.25986‑001 74.3mm SL.

Distribution

Type locality: Tham Nam Lang, Mae Hong Son Province, Thailand (19o31'N, 98o09'E). Known also from Tham Mae La Na, where it coexists with Cryptotora thamicola, Tham Plah (= Tham Hud), Tham Ban Pok Kut, Ban Nong Pha Cham and “Christmas Cave” (Richard Borowsky pers. comm.).

Habitat

Within Tham Mae La Na this species lives in gour pools while its co-inhabitant, Cryptotora thamicola, is found in water cascading over flowstone. A population estimate suggests that there are 104-105 individuals, a large population for a subterranean fish (Trajano, Mugue, Krejca, Vidthayanon, Smart and Borowsky 2002).  

Systematics

Nemacheilus reidi is postulated as a sister species of this species although it is pointed out that the relationships of the fish fauna of Thailand are very poorly known (Kottelat 1988a). Data on pigmentation and behaviour collected by Trajano, Mugue, Krejca, Vidthayanon, Smart and Borowsky (2002) suggest that this species is a neo stygobite.

Conservation Status

[VU D2:3.1:2011]

(Vidthayanon, C. 2011. Schistura oedipus. The IUCN Red List of Threatened Species 2011: http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T19976A9126230.en. Downloaded on 14 July 2017). This species is only known from subterranean streams in caves of Pang Mapha karst formation in north-western Thailand. Given the nature of the hydrological system and the likely limited extent of occurrence (considered to be much less than 2,000 km²), the species is assessed as Vulnerable (D2). Current and potential threats are tourism development and degradation of the surrounding watershed and water quality. R (IUCN 1990), R (IUCN 1993).

Museum Holdings

As above only.

Key References

Kottelat, M. Journal Article 1988 Two species of cavefishes from northern Thailand in the genera Nemachilus and Homaloptera (Osteichthyes, Homalopteridae)
Kottelat, M. Journal Article 1990 New species and populations of cave nemacheilines in south and south-east Asia (Osteichthyes, Balitoridae)
Borowsky, R. and Mertz, L. Journal Article 2001 Genetic differentiation among populations of cave fish Schistura oedipus (Cypriniformes: Balitoridae)
Borowsky, RL and Vidthayanon, C Journal Article 2001 Nucleotide diversity in populations of balitorid cave fishes from Thailand
Trajano, E, Mugue, N, Krejca, J, Vidthayanon, C, Smart, D and Borowsky, R. Journal Article 2002 Habitat, distribution, ecology and behaviour of cave balitorids from Thailand (Teleostei: Cypriniformes)
Kottelat, M Journal Article 2012 Draconectes narinosus, a new genus and species of cave fish from an island of Halong Bay, Vietnam (Teleostei: Nemacheilidae).
Schistura oedipus gold morph. Photograph by Paul Loiselle.
Schistura oedipus regenerating melanin. Photograph by Paul Loiselle.