Actinopterygii (ray-finned fishes) > Ophidiiformes
(Cusk eels) > Bythitidae
(Viviparous brotulas) > Brosmophycinae
Etymology: Monothrix: Greek, monos = one + Greek, thrix = hair (Ref. 45335). More on author: Ogilby.
Environment: milieu / climate zone / depth range / distribution range
Marine; reef-associated. Temperate
Southwest Pacific: eastern Australia. Record from Japan (Machida, 1992) is erroneous (Ref. 34024).
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 5.0 cm SL male/unsexed; (Ref. 76869); 5.3 cm SL (female)
soft rays: 64 - 76;
Vertebrae: 45 - 47. This species possess the following set of characters: anterior nostril low on snout; copulatory organ of male with a simple and small flap-like pair of (outer) pseudoclaspers; small, size < 5.5 cm SL, short predorsal length 26.5-30.7 % SL; 13-14 precaudal vertebrae, 45-47 total vertebrae; D 93-104, A 64-76, branchiostegal rays 6-7, V in D 2.4-2.6; scale patch only on cheek, scaleless operculum; presence of upper preopercular pore; joined opening for the first and second lower preopercular pore; otolith elongate, its length to height 2.3-2.4, its sulcus with nearly straight dorsal and convex ventral rim, short with otolith length to sulcus length 2.0, colliculi is fused; maxilla expanded posteroventrally; short anterior anal fin pterygiophore (Ref. 76869).
Common species found on shallow reefs (Ref. 34024). Benthic species which occurs in inshore waters (Ref. 75154).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Schwarzhans, W. and P.R. Møller, 2007. Review of the Dinematichthyini (Teleostei: Bythitidae) of the Indo-west Pacific. Part III. Beaglichthys, Brosmolus, Monothrix and eight new genera with description of 20 new species. The Beagle, Records of the Museums and Art Galleries of the Northern Territory 23:29-110. (Ref. 76869)
IUCN Red List Status (Ref. 120744)
CITES (Ref. 115941)
Threat to humans
Fisheries: of no interest
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00447 (0.00174 - 0.01147), 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 (11 of 100) .