Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Scorpaeniformes
(Scorpionfishes and flatheads) > Liparidae
Etymology: Psednos: Greek, psednos, -e, -on = rare (Ref. 45335); melanocephalus: From its dark head. More on authors: Chernova & Stein.
Environment: milieu / climate zone / depth range / distribution range
Marine; bathydemersal; depth range 0 - 3172 m (Ref. 58018). Deep-water
Northwest Atlantic: south of Greenland.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 4.8 cm SL (female)
Morphology | Morphometrics
soft rays: 31 - 33;
Vertebrae: 43. Coronal pore present. Opercular flap large, triangular and prominent, anus on vertical through gill opening. Gill opening reaching ventrally in front of 2-3 pectoral rays. Gill rakers unmodified. Pectoral fin rays of lower lobe equal in thickness to rays of upper pectoral fin lobe. Skin with yellowish-brown patterns; head beneath skin blackish-brown; gill arches and gill cavity brownish-black (Ref. 43481).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Chernova, N.V. and D.L. Stein, 2002. Ten new species of Psednos (Pisces, Scorpaeniformes: Liparidae) from the Pacific and North Atlantic oceans. Copeia 2002(3):755-778. (Ref. 43481)
IUCN Red List Status (Ref. 120744)
CITES (Ref. 118484)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates based on models
Preferred temperature (Ref. 115969
): 3.3 - 4.3, mean 3.7 (based on 65 cells).
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01000 (0.00244 - 0.04107), b=3.04 (2.81 - 3.27), in cm Total Length, based on all LWR estimates for this body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.2 ±0.6 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) .