Overview

Distribution

Range Description

This species ranges from the Northwest Pacific near Japan to Hawaiian waters (Tsuchiya 2009).
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Physical Description

Type Information

Paratype for Abraliopsis pacificus Tsuchiya & Okutani, 1990
Catalog Number: USNM 817633
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Sex/Stage: male; female;
Preparation: Isopropyl Alcohol
Year Collected: 1987
Locality: Izu-Ogasawara Trench, Japan, North Pacific Ocean
Depth (m): 95
Vessel: Kaiyo Maru R/V
  • Paratype: Tsuchiya, K. & Okutani, T. Bull. Nat. Sci. Mus. 16(2): 48.; Tsuchiya, K. & Okutani, T. 1990. Bull. Nat. Sci. Mus. 16(2): 48.
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Paratype for Abraliopsis pacificus Tsuchiya & Okutani, 1990
Catalog Number: USNM 817632
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Sex/Stage: male;
Preparation: Isopropyl Alcohol
Year Collected: 1987
Locality: Izu-Ogasawara Trench, Japan, North Pacific Ocean
Depth (m): 102
Vessel: Kaiyo Maru R/V
  • Paratype: Tsuchiya, K. & Okutani, T. Bull. Nat. Sci. Mus. 16(2): 48.; Tsuchiya, K. & Okutani, T. 1990. Bull. Nat. Sci. Mus. 16(2): 48.
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Source: National Museum of Natural History Collections

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Paratype for Abraliopsis pacificus Tsuchiya & Okutani, 1990
Catalog Number: USNM 817634
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Sex/Stage: female;
Preparation: Isopropyl Alcohol
Year Collected: 1982
Locality: Izu-Ogasawara Trench, Japan, North Pacific Ocean
Depth (m): 1 to 876
Vessel: Kaiyo Maru R/V
  • Paratype: Tsuchiya, K. & Okutani, T. Bull. Nat. Sci. Mus. 16(2): 48.; Tsuchiya, K. & Okutani, T. 1990. Bull. Nat. Sci. Mus. 16(2): 48.
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Source: National Museum of Natural History Collections

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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
This species appears to undergo vertical migration ranging from 900-500 m in depth during the day, rising up to 263-102 m at night (Tsuchiya and Okutani 1990). The spermatophores in mature males measured 6.5-7 mm in length (Tsuchiya and Okutani 1990). Enoploteuthids generally occur in mid-depths in the ocean and occasionally over the continental shelf (Norman 2003). They undergo diel vertical migrations, rising into the upper water column at night to feed (Norman 2003). Females spawn small eggs (0.9 and 1.5 mm in diameter depending on species, Young et al. 1992) individually into gelatinous strings (Norman 2003).

Systems
  • Marine
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Depth range based on 2 specimens in 1 taxon.
Water temperature and chemistry ranges based on 2 samples.

Environmental ranges
  Depth range (m): 95 - 102
  Temperature range (°C): 18.907 - 18.907
  Nitrate (umol/L): 1.848 - 1.848
  Salinity (PPS): 34.774 - 34.774
  Oxygen (ml/l): 5.024 - 5.024
  Phosphate (umol/l): 0.237 - 0.237
  Silicate (umol/l): 3.995 - 3.995

Graphical representation

Depth range (m): 95 - 102
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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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
2014

Assessor/s
Barratt, I. & Allcock, L.

Reviewer/s
Vecchione, M., Young, R. & Böhm, M.

Contributor/s
Duncan, C. & Carrete-Vega, G.

Justification
Abraliopsis pacificus is an oceanic species which has a wide geographic distribution, making it less susceptible to human impact. It has therefore been assessed as Least Concern. However, further research is recommended in order to determine the precise distribution, population dynamics, life history and ecology, and potential threat processes affecting this species.
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Population

Population
There is no population information available for this species.

Population Trend
Unknown
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Threats

Major Threats
The threats to this species are not known.
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Management

Conservation Actions

Conservation Actions
There are no species-specific conservation measures in place for this species. Further research is recommended in order to determine the precise distribution, population dynamics, life history and ecology, and potential threat processes affecting this species.
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Wikipedia

Abraliopsis pacificus

Abraliopsis pacificus is species of enoploteuthid cephalopod from the northwestern Pacific Ocean, from Japan to Hawaiʻi. This species undergoes vertical migration from 900–500 m depth during the day, rising to 263–102 m depth at night. Male spermatophores are 6.5–7 mm in length.

References[edit]

  1. ^ Barratt, I. & Allcock, L. (2014). "Abraliopsis pacificus". IUCN Red List of Threatened Species. Version 2014.2. International Union for Conservation of Nature. Retrieved 28 August 2014. 
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