Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Ophidiiformes
(Cusk eels) > Bythitidae
(Viviparous brotulas) > Brosmophycinae
Etymology: Diancistrus: Greek, di = two + Greek, agkistron = hook (Ref. 45335); vietnamensis: Named for its type locality, Vietnam.
Environment: milieu / climate zone / depth range / distribution range
Marine; reef-associated. Tropical
Western Pacific: northernmost Viet Nam (Cat Ba Islands) and adjacent southernmost China.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 6.2 cm SL male/unsexed; (Ref. 57884); 7.2 cm SL (female)
Morphology | Morphometrics
soft rays: 58 - 64;
Vertebrae: 31 - 33. This species is distinguished by the following: vertebrae 11+31-33=42-44, dorsal fin rays 69-80 (mostly <77), anal fin rays 58-64, D/V 7-8; moderately large eyes (2.0-2.9% SL); outer pseudoclasper with hook-shaped extension oriented backward at 90° angle and slightly bent outwards and with rounded tip; inner pseudoclasper short, joined to outer pseudoclasper anteriorly, with supporter, with anterior hook oriented forward at 90° angle and wide thin flap at its base; narrow scale patch on cheek with 4-5 scale rows on upper cheek, 4-5 scales in 2 rows on operculum above opercular spine; the head profile high-necked, broad; otolith length sulcus length at least 2.3, sulcus inclined at 5-10° (Ref. 57884).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Schwarzhans, W., P.R. Møller and J.G. Nielsen, 2005. Review of the Dinematichthyini (Teleostei, Bythitidae) of the Indo-West-Pacific. Part I. Diancistrus and two new genera with 26 new species. The Beagle, Records of the Museum and Art Galleries of the Northern Territory 21:73-163. (Ref. 57884)
IUCN Red List Status (Ref. 119314)
CITES (Ref. 115941)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00457 (0.00179 - 0.01169), b=3.10 (2.87 - 3.33), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.2 ±0.5 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Low vulnerability (14 of 100) .