Classification / Names
Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa
Teleostei (teleosts) >
Perciformes/Zoarcoidei (Eelpouts and pricklebacks) >
Zoarcidae (Eelpouts) > Lycodinae
Etymology: Pyrolycus: Greek, pyr = fire + Greek, lykos = wolf (Ref. 45335); jaco: Name 'jaco from the type locality of the new species, Jacó Scar site, which was also named after the nearby coastal district Jacó.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; demersal; depth range 1604 - 1854 m (Ref. 137812). Tropical
Eastern Central Pacific: Costa Rica.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 1.1 cm SL male/unsexed; (Ref. 137812)
Short description
Identification keys | Morphology | Morphometrics
Dorsal soft rays (total): 37 - 57; Anal soft rays: 22 - 43; Vertebrae: 80. This species is distinguished from its congeners by the following set of characters: five suborbital bones with 5 pores, occipital pores 2, postorbital pores 3; vertebrae 23 + ~57 = ~80, presence of vomerine 7-8 and palatine teeth 12-15; total gill rakers 2-3+13-15= 16-17, pectoral fin rays 14-15, upper jaw short 33.9-42.4% HLl; snout short 21.3-24.3% HL; precaudal vertebrae 22-23; postorbital pores 3; pectoral-fin rays 4-15 ; occipital pores (1-0-1); eye diameter 12.1-14.9; gill slit 26.9-34.7 (Ref. 137812).
Body shape (shape guide): eel-like; Cross section: circular.
This species feeds on benthic sessile invertebrates associated with the hydrothermal seep area. Dissection and scans reveal limpets and snail in the gut of the paratype (Ref 137812).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Frable, B.W., C.A. Seid, A.W. Bronson and P.R. Møller, 2023. A new deep-sea eelpout of the genus Pyrolycus (Teleostei: Zoarcidae)
associated with a hydrothermal seep on the Pacific margin of Costa Rica. Zootaxa 5230(1):79-89. (Ref. 137812)
IUCN Red List Status (Ref. 130435: Version 2025-2)
Threat to humans
Harmless
Human uses
Fisheries: of no interest
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