Classificatie / Names
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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
Ecologie
; zoet water benthopelagisch. Tropical
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.
Grootte / Gewicht / Leeftijd
Maturity: Lm ? range ? - ? cm
Max length : 2.5 cm SL mannelijk / geslacht onbekend; (Ref. 122370)
Korte beschrijving
Morfologie | Morfometrie
Dorsale stekels (totaal): 1; Dorsale zachte stralen (totaal): 7; Anale stekels 1; Anale zachte stralen: 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).
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).
Levenscyclus en paargedrag
Maturiteit | Voortplanting | Paaien | Eieren | Fecunditeit | Larven
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)
Status op de Rode Lijst van het IUCN (Ref. 130435)
Gevaar voor de mens
Harmless
Gebruik door de mens
Meer informatie
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Estimates based on models
Fylogenetische diversiteitsindex (Ref.
82804): PD
50 = 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).
Trofisch niveau (Ref.
69278): 3.1 ±0.4 se; based on size and trophs of closest relatives
Weerstandsvermogen (Ref.
120179): Hoog, minimale populatieverdubbelingstijd minder dan 15 maanden (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
