Forktail Pygmygoby, Trimma hoesei Winterbottom 1984

Other Names: Forktail Dwarfgoby, Forktail Pygmy Goby

A Forktail Pygmygoby, Trimma hoesei, at Monad Shoals, Malapascua, Philippines, depth 46 m, January 2011. Source: Klaus Stiefel / Flickr. License: CC BY Attribution-NonCommercial

A semi-translucent pygmygoby with a forked tail, a pinkish lower body, a vertical yellow streak on most scales, yellowish fins with pinkish streaks on the caudal fin, and bands/stripes on the dorsal and anal fins.

Cite this page as:
Dianne J. Bray, Trimma hoesei in Fishes of Australia, accessed 18 Jul 2024,

Forktail Pygmygoby, Trimma hoesei Winterbottom 1984

More Info


Known from the southern part of the Great Barrier Reef, and Cocos (Keeling) Islands in the eastern Indian Ocean. Elsewhere, the species occurs in the tropical Indo-west Pacific.
Inhabits steep outer reef slopes, and is often seen swimming upside-down in caves.


Dorsal fin VI + I,9-10; Anal fin I,9-11; Pectoral fin 15-16, 9-10 branched; Longitudinal scale series 23-26; Predorsal scales 2-5.
Body depth ~4.5-4.8 in SL; second and third dorsal-fin spines  elongate; fifth pelvic-fin ray branched, equal in length to fourth ray; caudal fin forked; scales absent from cheek and opercle.

Species Citation

Trimma hoesei Winterbottom 1984, Canadian J. Zool. 62: 704, figs 7, 18-19. Type locality: Chagos Archipelago. 


Dianne J. Bray


Australian Faunal Directory

Forktail Pygmygoby, Trimma hoesei Winterbottom 1984


Allen, G.R. & Erdmann, M.V. 2012. Reef fishes of the East Indies. Perth : Tropical Reef Research 3 vols, 1260 pp. 

Allen, G.R. & Smith-Vaniz, W.F. 1994. Fishes of Cocos (Keeling) Islands. Atoll Research Bulletin 412: 1-21.

Hobbs, J-P.A., Newman, S .J., Mitsopoulos, G.E.A., Travers, M.J., Skepper, C.L., Gilligan, J.J., Allen, G.R., Choat, H.J. & Ayling, A.M. 2014. Fishes of the Cocos (Keeling) Islands: new records, community composition and biogeographic significance. Raffles Bulletin of Zoology Supplement 30: 203–219. 

Winterbottom, R. 1984. A review of the gobiid fish genus Trimma from the Chagos Archipelago, central Indian Ocean, with description of seven new species. Canadian Journal of Zoology 62: 695-715.

Winterbottom, R. & Hoese, D.F. 2015. A revision of the Australian species of Trimma (Actinopterygii, Gobiidae), with descriptions of six new species and redescriptions of twenty-three valid species. Zootaxa 3934: 1-102.

Quick Facts

CAAB Code:37428266

Depth:15-50 m

Habitat:Reef associated

Max Size:3 cm TL

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Species Maps

CAAB distribution map