Overview

Comprehensive Description

Biology

Ovoviviparous (Ref. 205).
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Distribution

Range Description

Currently known only from oceanic ridges near New Caledonia (Norfolk and Lord Howe Ridges), but could be wider-ranging and possibly semi-oceanic.
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Norfolk Ridge, southwestern Pacific.
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Western Pacific: Norfolk Ridge and Lord Howe Ridge off New Caledonia.
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Physical Description

Size

Max. size

45.3 cm TL (male/unsexed; (Ref. 45056)); 41.4 cm TL (female)
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Diagnostic Description

Body cigar-shaped; deep head conical with a short bulbous snout; preoral length 7.3-8.2 % TL. Eye almost round with a small opalescent lunate patch on upper eyelid margin. Pectoral fins small, rear tip about cornea diameter in front of D2 origin. Dorsal and ventral coloration dark; white conspicuous pineal blotch small and triangular. Caudal peduncle short (14.8-16.6% TL). Upper teeth of mature males usually with 7 cusps, others 9-11, in separated rows; central cusps greatly expanded, about 2 times longer than those adjacent. Denticles small, with a single erected, slightly curved cusps, arranged in irregular rows. Anterior branch of pelvic marking long and slender, posterior branch truncated. Precaudal marking with very long finger-like extensions reaching to central caudal fin. Monospondylous centra 46-47 (Ref. 45056).
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Known from only a few specimens, caught on the bottom at 1,043 to 1,102 m on oceanic ridges. Morphology suggests that it may be wider ranging. Biology is unknown. All specimens taken were 40 to 45 cm in length, all males mature.

Systems
  • Marine
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Environment

bathypelagic; marine; depth range 668 - 1170 m (Ref. 45056)
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Depth range based on 4 specimens in 1 taxon.
Water temperature and chemistry ranges based on 4 samples.

Environmental ranges
  Depth range (m): 935 - 1119
  Temperature range (°C): 4.321 - 5.174
  Nitrate (umol/L): 29.897 - 33.100
  Salinity (PPS): 34.461 - 34.475
  Oxygen (ml/l): 4.065 - 4.271
  Phosphate (umol/l): 2.042 - 2.293
  Silicate (umol/l): 41.099 - 52.696

Graphical representation

Depth range (m): 935 - 1119

Temperature range (°C): 4.321 - 5.174

Nitrate (umol/L): 29.897 - 33.100

Salinity (PPS): 34.461 - 34.475

Oxygen (ml/l): 4.065 - 4.271

Phosphate (umol/l): 2.042 - 2.293

Silicate (umol/l): 41.099 - 52.696
 
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Life History and Behavior

Life Cycle

Distinct pairing with embrace (Ref. 205).
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Etmopterus pseudosqualiolus

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 2
Species With Barcodes: 1
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Barcode data: Etmopterus pseudosqualiolus

The following is a representative barcode sequence, the centroid of all available sequences for this species.


No available public DNA sequences.

Download FASTA File
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2003

Assessor/s
Fowler, S.L. & Séret, B. (SSG Australia & Oceania Regional Workshop, March 2003)

Reviewer/s
Fowler, S. & Musick, J.A. (Shark Red List Authority)

Contributor/s

Justification
This small lantern shark has been recorded from only a small area and relatively narrow depth band on oceanic ridges near New Caledonia. There is very limited deepwater fishing within its range, the species is not targeted but discarded if occasionally caught on the unsuitable large hooks of commercial gear. There is no reason to suspect a decline in range, habitat quality or number of individuals. It may also prove not to be restricted to such a small area if additional survey are undertaken.
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Population

Population
Population size unknown.

Population Trend
Unknown
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Threats

Major Threats
Deepwater fisheries are very uncommon around New Caledonia. This species is not targeted, discarded if caught, and unlikely to be caught frequently on large commercial fishing hooks.
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Least Concern (LC)
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Management

Conservation Actions

Conservation Actions
There are currently no conservation measures in place for this species.
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Wikipedia

False lanternshark

The false lanternshark, Etmopterus pseudosqualiolus, is a shark of the family Etmopteridae found in the western Pacific from the Norfolk Ridge and Lord Howe Ridge off New Caledonia.

References

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