Overview

Brief Summary

Introduction

Material of Histioteuthis meleagroteuthis examined by Voss et al. (1998) and earlier workers cited therein found no indication of population differentiation over the broad geographical, but interrupted, range of this species. However some variation in the sucker enlargement pattern of the club is a possible exception. Additional squid are needed to evaluate the latter. Also, descriptions of spermatophores from different geographical regions are needed.

Brief diagnosis:

A Histioteuthis ...

  • with 8-10 series of photophores on arm IV.
  • with tubercules.

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Comprehensive Description

Characteristics

  1. Head
    1. Beaks: Descriptions can be found here: Lower beak; upper beak.

  2. Arms
    1. Tubercules form serrate ridge along aboral midline proximally on arms I-III. on middorsal line on anterior 1/2-2/3 of mantle beneath epithelium and on proximal half of arms I-III.
  3. Mantle
    1. Tubercules form serrate ridge along middorsal line on anterior 1/2-2/3 of mantle beneath epithelium and on proximal half of arms I-III.

      Figure. Dorsolateral view of the mantle tubercules of H. meleagroteuthis, showing undamaged region covered by skin adjacent to a damaged area (center left) with skin lost. Photograph by M. Vecchione.

Comments

More details of the description can be found here.

Species of the meleagroteuthis-group are distinguished by the following characteristics:

  1. Photophores
    1. In 8-10 series on arm IV base.
    2. Usually 19-22 photophores on right eyelid.
    3. Compound photophores of uniform size, small and densely packed on anterior 3/4 of ventral mantle.

H. meleagroteuthis is easily separated from the other member of the meleagroteuthis-group, H. heteropsis, by the presence of tubercles.

The above information is taken from Voss (1969) and Voss, et al. (1998).

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Distribution

circum-(sub)tropical
  • UNESCO-IOC Register of Marine Organisms
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© WoRMS for SMEBD

Source: World Register of Marine Species

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Range Description

This species occurs throughout the subtropical and tropical regions of the world's oceans (Young and Vecchione 2006). It is absent from waters of low productivity such as the Caribbean Sea, Californian and Peru-Chile currents, and central Pacific waters close to Hawaii (Young and Vecchione 2006).
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Source: IUCN

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Geographical distribution

Type locality: South Pacific, north of New Zealand at 35°45'S, 176°20'E, 549-686 m depth.

H. meleagroteuthis has been taken throughout much of the world's tropical and subtropical waters. However, it appears to be absent from the oligotrophic subtropical waters south of Bermuda, the Gulf of Mexico and Caribbean Sea in the Atlantic and transitional waters of the California and Peru-Chile currents (habitat occupied by its close relative H. heteropsis) and the northern tropical central waters around Hawaii in the Pacific (Voss, et al., 1998).

Figure. Distribution chart of H. meleagroteuthis, modified from Voss et al., 1998.

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Ecology

Habitat

Known from seamounts and knolls
  • Stocks, K. 2009. Seamounts Online: an online information system for seamount biology. Version 2009-1. World Wide Web electronic publication.
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© WoRMS for SMEBD

Source: World Register of Marine Species

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mesopelagic
  • UNESCO-IOC Register of Marine Organisms
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© WoRMS for SMEBD

Source: World Register of Marine Species

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Habitat and Ecology

Habitat and Ecology
This species' distribution seems to relate to land masses and submarine ridges and mounts (Voss et al. 1998). Closing nets have collected small juveniles (Voss et al. 1998) at 100-300 m depth and larger juveniles have been captured deeper. Open nets have caught individuals in midwater and near the seafloor between 200 and 1,950 m in depth (Voss et al. 1998), and mature specimens between 910 and 1,010 m in depth at night (Voss et al. 1998). Females may spawn in deep water (Voss et al. 1998). The spermatophores of mature males (65-102 mm in mantle length) are short in length (1.2-1.7 mm; Voss et al. 1998). Mature egg length is unknown (Voss et al. 1998).

Histioteuthids typically undergo diel vertical migrations and often occur in high abundances (Voss et al. 1998). Sexually mature adults often demonstrate changes in photophore and body morphology, and descend to deeper depths (e.g. to more than 2,000 m in depth; Voss et al. 1998, Young and Vecchione 2007). Mating probably occurs at deep depths, although spawning may occur either at deep depths or in near surface waters depending on species (Voss et al. 1998). They are important in the diets of a variety of marine mammals, seabirds and fish (Voss et al. 1998).

Systems
  • Marine
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Depth range based on 70 specimens in 1 taxon.
Water temperature and chemistry ranges based on 70 samples.

Environmental ranges
  Depth range (m): 45 - 3109
  Temperature range (°C): 2.715 - 21.397
  Nitrate (umol/L): 0.495 - 36.323
  Salinity (PPS): 34.336 - 36.588
  Oxygen (ml/l): 1.558 - 6.416
  Phosphate (umol/l): 0.046 - 2.531
  Silicate (umol/l): 0.908 - 94.535

Graphical representation

Depth range (m): 45 - 3109

Temperature range (°C): 2.715 - 21.397

Nitrate (umol/L): 0.495 - 36.323

Salinity (PPS): 34.336 - 36.588

Oxygen (ml/l): 1.558 - 6.416

Phosphate (umol/l): 0.046 - 2.531

Silicate (umol/l): 0.908 - 94.535
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Life History and Behavior

Life Cycle

Life History

Females mature at 114 mm ML (spent female, 27°S, 37°W); males at 65-102 mm ML (Voss, et al., 1998).

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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
Young, R., Vecchione, M. & Böhm, M.

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

Justification
Histioteuthis meleagroteuthis is an oceanic species which has been assessed as Least Concern, as it has a wide geographic distribution, making it less susceptible to human impact. 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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