Overview

Comprehensive Description

Biology

Oceanic (Ref. 6871). A rare species known only from a few specimens taken by tuna longliners and trawlers (Ref. 6871). Ovoviviparous (Ref. 205), with at least 59 young in a litter (Ref. 26346).
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Distribution

Range Description

Apparently circumglobal in the Southern Ocean.
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Eastern Indian Ocean: southern Australia. Southwest Pacific: New Zealand.
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Southeastern Indian Ocean and southwestern Pacific.
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Physical Description

Morphology

Dorsal spines (total): 0
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Size

Maximum size: 1110 mm TL
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Max. size

111 cm TL (male/unsexed; (Ref. 26346))
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Diagnostic Description

Grey and white, mottled with large brown or black spots; tail mostly white with black tips (Ref. 26346). Dorsal fins small, pectoral fins angular, and an asymmetric caudal fin with a dark-tipped upper lobe (Ref. 6871).
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Depth range: 150 to 500 m. Upper slope (Pukaki Rise, New Zealand), possibly mesopelagic. Reaches at least 111 cm total length (TL). Size at maturity is unknown. The smallest mature female reported was 74 cm TL. This species appears to be highly fecund (litter size more than 59) however, the gestation period and pupping interval is unknown. Size at birth, age and growth, and diet are unknown.

Systems
  • Marine
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Environment

bathypelagic; oceanodromous (Ref. 51243); marine; depth range 150 - 510 m (Ref. 6871)
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Depth range based on 3 specimens in 1 taxon.
Water temperature and chemistry ranges based on 3 samples.

Environmental ranges
  Depth range (m): 200 - 1539.5
  Temperature range (°C): 2.468 - 6.911
  Nitrate (umol/L): 18.632 - 33.855
  Salinity (PPS): 34.325 - 34.684
  Oxygen (ml/l): 4.241 - 6.125
  Phosphate (umol/l): 1.384 - 2.290
  Silicate (umol/l): 6.953 - 71.658

Graphical representation

Depth range (m): 200 - 1539.5

Temperature range (°C): 2.468 - 6.911

Nitrate (umol/L): 18.632 - 33.855

Salinity (PPS): 34.325 - 34.684

Oxygen (ml/l): 4.241 - 6.125

Phosphate (umol/l): 1.384 - 2.290

Silicate (umol/l): 6.953 - 71.658
 
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Depth: 150 - 510m.
From 150 to 510 meters.

Habitat: bathypelagic. Oceanic. A rare species known only from a few specimens taken by tuna longliners and trawlers. Probably ovoviviparous.
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Migration

Oceanodromous. Migrating within oceans typically between spawning and different feeding areas, as tunas do. Migrations should be cyclical and predictable and cover more than 100 km.
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Trophic Strategy

Found on the continental shelf (Ref. 75154).
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Life History and Behavior

Life Cycle

Probably ovoviviparous (Ref. 6871), with at least 59 young (Ref. 26346). Distinct pairing with embrace (Ref. 205).
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Scymnodalatias albicauda

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 2
Species With Barcodes: 1
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
DD
Data Deficient

Red List Criteria

Version
3.1

Year Assessed
2003

Assessor/s
Duffy, C. (SSG Australia & Oceania Regional Workshop, March 2003)

Reviewer/s
Shark Specialist Group Australia & Oceania Regional Group (Shark Red List Authority)

Contributor/s

Justification
This species appears to be widespread in the Southern Ocean but is known from very few specimens. It is naturally rare and there is insufficient information on its biology, distribution and exploitation to assess it beyond Data Deficient.
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Population

Population Trend
Unknown
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Threats

Major Threats
Infrequently taken in deepwater trawl and tuna longline fisheries.
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Data deficient (DD)
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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

Whitetail dogfish

The whitetail dogfish, Scymnodalatias albicauda, is a very rare sleeper shark of the family Somniosidae, found from the eastern Indian Ocean round southern Australia to New Zealand, at depths of between 150 and 500 m. Its length is up to 1.1 m.

The whitetail dogfish is a rare species known only from a few specimens taken by tuna longliners and trawlers. The dorsal fins are small, the pectoral fins are angular, and there is an asymmetric caudal fin with a dark-tipped upper lobe.

Coloration is grey and white, mottled with large brown or black spots, the tail mostly white with black tips.

The whitetail dogfish is ovoviviparous, with at least 59 pups per litter.

References

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