Trigonostigma truncata

Trigonostigma truncata Tan, 2020

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Classification / Names Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa

Actinopteri (ray-finned fishes) > Cypriniformes (Carps) > Danionidae (Danios) > Rasborinae
Etymology: Trigonostigma: Greek, tres, tria = three + Greek, gonias= angle, corner + Greek stigma = signal;  truncata: Name from the Latin ‘truncus’ meaning cut off; referring to the caudal apex of the axine not reaching the base of the caudal-fin; noun in apposition.

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

Freshwater; benthopelagic.   Tropical

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

Asia: from the east coast of the Malay Peninsula, from south of the Isthmus of Kra in Narathiwat province of southern Thailand to the Malaysian State of Terengganu.

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm
Max length : 2.5 cm SL male/unsexed; (Ref. 122370)

Short description Morphology | Morphometrics

Dorsal spines (total): 1; Dorsal soft rays (total): 7; Anal spines: 1; Anal soft rays: 6. This species differs from T. heteromorpha in the following characters: a gently sloping lateral head profile to pre-dorsal region (vs. steep convex); sub-superior mouth (vs. terminal); caudal apex of axine not reaching caudal-fin base (vs. reaching and extending to hypural plate); dorsal and ventral apices of axine originate posterior to both dorsal-fin and pelvic-fin origins by up to three scale-widths (vs. dorsal apex starting one scale-width posterior to dorsal-fin origin and ventral apex starting at pelvic-fin origin); faint or indistinct brown humeral streak just posterior to opercular opening (vs. a distinct black humeral streak); base of dorsal fin hyaline and its middle reddish-orange in life (vs. anterior two-thirds orange-red); a distinct orange-red colour on anal fin in life (vs. faint or absence); body in life with a bluish-lilac sheen (vs. reddish or purplish sheen); a shallower body (depth at dorsal-fin origin 28.3-34.6% SL [mean 32.4], vs. 32.6-38.2% [mean 35.8]) (Ref. 122370).

Biology     Glossary (e.g. epibenthic)

This species occurs in lowland freshwater acid swamp-forest stream habitats, usually flowing into riverine habitats. Associated species include the following: Notopterus notopterus (Notopteridae); Barbodes cf. binotatus, Desmopuntius hexazona, Osteochilus vittatus, O. waandersii (Cyprinidae); Boraras maculatus, B. urophthalmoides, Rasbora bankanensis, R. cephalotaenia, R. usonensis, R. einthovenii, R. paucisqualis, Trigonopoma gracile, T. pauciperforatum (Danionidae); Acanthopsoides sp., Lepidocephalichthys furcatus, Pangio cuneovirgata, P. piperata, P. semicincta, P. muraeniformis (Cobitidae); Homalopteroides nebulosus (Balitoridae); Nemacheilus selangoricus (Nemacheilidae); Barbucca diabolica (Barbuccidae); Hemibagrus capitulum, Nanobagrus fuscus, Pseudomystus stenomus (Bagridae); Kryptopterus minor, Silurichthys hasseltii (Siluridae); Parakysis verrucosus (Akysidae); Clarias leiacanthus, C. meladerma (Clariidae); Monopterus javanensis (Synbranchidae); Neostethus smithi (Phallostethidae); Bihunichthys sp., Chaudhuria sp. (Chaudhuriidae); Oryzias minutulatus (Adrianichthyidae); Indostomus crocodilus (Indostomidae); Hemirhamphodon pogonognathus (Zenarchopteridae); Xenentodon canciloides (Belonidae); Doryichthys martensii (Syngnathidae); Brachygobius xanthomelas (Gobiidae); Pristolepis grooti (Pristolepididae); Nandus nebulosus (Nandidae); Betta imbellis, B. pi, stigmosa, Luciocephalus pulcher, Parosphomenus paludicola, Trichopodus trichopterus, Trichopsis vittata (Osphronemidae); Channa limbata, and C. lucius (Channidae) (Ref. 122370).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Main reference Upload your references | References | Coordinator | Collaborators

Tan, H.H., 2020. Trigonostigma truncata, a new species of harlequin rasbora from Malay Peninsula (Teleostei: Danionidae). Raff. Bull. Zool. 68:421-433. (Ref. 122370)

IUCN Red List Status (Ref. 123251)


CITES (Ref. 123416)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless





Human uses

FAO - Publication: search | FishSource |

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Estimates based on models

Phylogenetic diversity index (Ref. 82805):  PD50 = No PD50 data   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01995 (0.00906 - 0.04395), b=3.01 (2.83 - 3.19), in cm total length, based on all LWR estimates for this body shape (Ref. 93245).
Trophic level (Ref. 69278):  3.1   ±0.4 se; based on size and trophs of closest relatives
Resilience (Ref. 120179):  High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153):  Low vulnerability (10 of 100) .