Hydrolagus trolli

Didier & Séret, 2002


Pointy-nosed blue chimaera
Classification: Holocephali Chimaeriformes Chimaeridae

Reference of the original description
Didier, D.A. & Séret, B. (2002)
Chimaeroid fishes of New Caledonia with description of a new species of Hydrolagus (Chondrichthyes, Holocephali). Cybium, 26(3), 225–233

Image of the original description
Image in copyright.

Synonyms / new combinations and misspellings
Hydrolagus cf. trolli



Description :


Citation: Hydrolagus trolli Didier & Séret, 2002: In: Database of modern sharks, rays and chimaeras, www.shark-references.com, World Wide Web electronic publication, Version 03/2024

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Hydrolagus trolli Didier & Séret, 2002 © National Institute of Water and Atmospheric Research (NIWA)
Common names
fra \(T\) Chimère bleue à museau pointu, eng Pointy-nosed blue chimaera

Short Description
Original diagnosis after DIDIER & SÉRET, 2002 [687]: A species of chimaeroid fish assigned to the genus Hydrolagus on the basis of a ventral caudal fin that is not deeply indented at its origin to form a separate anal fin. Hydrolagus trolli is distinguished from its congeners by the following combination of characters: even blue-gray coloration with dark line around orbit and dark shadowing along edges of lateral-line canals; distinctly pointed snout; preopercular and oral lateral-line canals typically sharing a common branch; first dorsal fin concave with pale margin; males with frontal tenaculum deeply curved, upturned distally with spines along dorsal upturned edge; prepelvic tenacula deeply indended along distal margin; and pelvic claspers with pale fleshy distal lobes, divided distally for 1/3 their length, tips usually extending beyond distal edge of pelvic fins.

Distribution
Western Pacific: New Caledonia and New Zealand [687].
first record: 2016: REICHERT et al. 2016 [24556]: North Pacific, off central California, southern California, and west of the Hawaiian Islands Source: www.gbif.org

Biology
Oviparous [17086].

Size / Weight / Age
112 cm TL (male/unsexed; (Ref. 45071)); 120.4 cm TL (female) [687]

Habitat
bathydemersal; marine; depth range 612 - 1707 m [687]

Dentition
Tooth plates yellowish. Upper anterior tooth plates (vomerine) small, incisor-like with 6 or 7 rows of tritor knobs visible along the cutting edge. Posterior upper tooth plates (palatine) with tritors on worn surface (details not readily visible in specimens with mouths fixed shut). Lower tooth plates (mandibular) incisor like with two large tritors at the symphysis forming a pointed blade that becomes deeply indented along the edge; occluding with the vomerine tooth plates then rises again at the postero-lateral (labial) edge of the tooth plate; 2 large tritors at the leading edge as the tooth plate gradually slopes posteriorly along worn edge. [687]

Remarks
shark-references Species-ID=3094;