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); jackrandalli: Named for John (Jack) E. Randall.
Environment: milieu / climate zone / depth range / distribution range
Marine; reef-associated; depth range 2 - 4 m (Ref. 57884). Tropical
Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri
Northwest Pacific: Ryukyu Islands, Japan.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 7.9 cm SL male/unsexed; (Ref. 57884)
Morphology | Morphometrics
soft rays: 60 - 67;
Vertebrae: 40 - 41. The species is distinguished by the following: Vertebrae 11+29-30=40-41, dorsal fin rays 76-79, anal fin rays 60-67; small eyes (1.6-2.1% SL); outer pseudoclasper moderately large, wing- shaped, slightly bent outwards; inner pseudoclasper almost free, bifurcate, with stout hook-like anterior branch and broad flap-like posterior branch; scale patch on cheek with 6-7 rows of small scales on upper cheek, 2 large scales on operculum above opercular spine; head massive, broad; otolith length to height ratio 2.1. This is the only species of the genus which combines small eyes (about 2.1% SL) with presence of scales on the operculum (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
CountriesFAO areasEcosystemsOccurrencesIntroductionsStocksEcologyDietFood itemsFood consumptionRation
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 (15 of 100) .