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> Cypriniformes (Carps) > Gastromyzontidae (Hillstream loaches)
Etymology: Gastromyzon: Greek, gaster = stomach + Greek, myzo = to suckle (Ref. 45335); extrorsus: From the Latin adjective extrorsus, meaning in an outward direction, referring to the occurrence of this species only in the coastal river basins draining from the west side of the Crocker Range in Sabah.

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

; eau douce démersal; pH range: 7.9 - ?. Tropical

Distribution Pays | Zones FAO | Écosystèmes | Occurrences | Point map | Introductions | Faunafri

Asia: Kimanis and Petagas River basins in Sabah, Malaysia.

Taille / Poids / Âge

Maturity: L_m ? range ? - ? cm
Max length : 7.7 cm SL mâle / non sexé; (Ref. 57871)

Description synthétique Clés d'identification | Morphologie | Morphométrie

Rayons mous dorsaux (Total) : 7; Rayons mous anaux: 4; Vertèbres: 30 - 32. Can be distinguished from other species of the genus by possessing the following unique combination of characters: presence of distinct secondary rostrum; presence of complete post-oral pouch; body brown with up to 9 thin gold bars, head dorsum dark brown with thin gold reticulate pattern; subopercular groove absent; gill slit vertical; sublacrymal groove present; a truncate snout when viewed dorsally; abdomen without scales; lateral line scales 69-77; pelvic fin just touching anal fin origin, adpressed dorsal fin not overlapping level of anal fin origin (Ref. 57871).

Occurs in unshaded fast flowing rivers with boulder, rock and sand substratum (Ref. 57871).

Life cycle and mating behavior Maturité | Reproduction | Frai | Œufs | Fécondité | Larves

Référence principale Upload your references | Références | Coordinateur | Collaborateurs

Tan, H.H., 2006. The Borneo suckers. Revision of the torrent loaches of Borneo (Balitoridae): Gastromyzon, Neogastromyzon). Kota Kinabalu, Sabah, Malaysia : Natural History Publications (Borneo) in association with Raffles Museum of Biodiversity Research. vii, 245 p. : ill. (some col.), maps ; 26 cm. (Ref. 57871)

Statut dans la liste rouge de l'IUCN (Ref. 130435: Version 2024-2)

Quasi-menacé (NT) (B1ab(i,ii,iii)+2ab(i,ii,iii)); Date assessed: 31 December 2018

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Menace pour l'homme

Harmless

Utilisations par l'homme

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Estimates based on models

Phylogenetic diversity index (Ref. 82804): PD₅₀ = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.00617 (0.00268 - 0.01421), b=3.11 (2.91 - 3.31), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).

Niveau trophique (Ref. 69278): 2.0 ±0.1 se; based on size and trophs of closest relatives

Fishing Vulnerability (Ref. 59153): Low vulnerability (10 of 100).

Gastromyzon extrorsus Tan, 2006