Classification / Names
Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa
Actinopteri (ray-finned fishes) > Lampriformes
(Velifers, tube-eyes and ribbonfishes) > Radiicephalidae
Etymology: Radiicephalus: Latin, radius + Greek, kephale = head (Ref. 45335); kessinger: Name from Latin 'kessinger' for 'scarecrow', referring to the tattered, ribbon-like body.
Environment: milieu / climate zone / depth range / distribution range
Marine; pelagic-oceanic; depth range - 100 m (Ref. 123098), usually - m (Ref. ). Subtropical; 0°C -
Northwest Pacific: Taiwan.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 61.8 cm SL male/unsexed; (Ref. 123098)
Morphology | Morphometrics
soft rays: 6. This species can be distinguished from R. elongatus by the following: A 6 (vs. 7); pectoral-fn rays 11 (vs. 10); pelvic-fn rays 5 (vs. 9-10); upper caudal-fn rays 5 (vs. 4); caudal vertebrae 88 (vs. 77-80); end of dorsal-fn base anterior to middle of anal and caudal fns (vs. posterior), the distance between end of dorsal-fn base and caudal-fn base 20.7% SL and 144.7% HL (vs. 14.0-15.5% SL and 94.5-102.7% HL); anal-fn rays short [the frst ray very short, 0.7% HL (vs. 1.8-2.1% HL)]; lateral line through middle of body at pectoral-fn base, its height 50.3% (vs. higher than middle, 54.3-58.6%); lower jaw completely covered by upper jaw (vs. not covered by upper jaw); anterior tip of upper jaw projecting anteriorly beyond lower jaw when mouth open (vs. not projecting); mandible with a single irregular row (vs. 2 irregular rows), teeth larger and sharper than premaxillary teeth (vs. similar to premaxillary teeth) (Ref. 123098).
Th e holotype was collected shallower than 100 m depth by a mid-water trawl targeting the Sakura-shrimp Lucensosergia lucens (Ref. 123098).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Koeda, K. and H.-C. Ho, 2019. A new tapertail species (family Radiicephalidae; Lampridiformes) from Taiwan, the first confirmed western Pacific Ocean record of the family. Ichthyol. Res. 66:207-214. (Ref. 123098)
IUCN Red List Status (Ref. 124695)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Phylogenetic diversity index (Ref. 82805
= No PD50 data [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00180 - 0.00842), b=3.12 (2.94 - 3.30), in cm total length, based on all LWR estimates for this body shape (Ref. 93245
Trophic level (Ref. 69278
): 4.0 ±0.6 se; based on size and trophs of closest relatives
Vulnerability (Ref. 59153
): Moderate to high vulnerability (48 of 100) .