Overview

Brief Summary

Introduction

Joubin (1933) collected 18 young squid of this species but based his description on three specimens, 61 (arm tip to tail), 45 and 17 mm (tentacle tip to tail). All specimens, in spite of the rather large size, these are paralarvae that lack most subadult characteristics.

Brief diagnosis:

A mastigoteuthid ...

  • with large tubercules in advanced paralarvae.
  • with a fin that is longer than wide.

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Comprehensive Description

Characteristics

  1. Arms
    1. Arm suckers without teeth.
    2. Figure. Oral-oblique view of arm IV sucker of M. danae, specimen 1. Drawing from Joubin (1933).

  2. Tentacles
    1. Stalk about 2 mm in length and slender.
    2. Club enlarged in diameter, ca. 7 mm long.
    3. Club tip slender, ca. 3 mm long, with sucker buds.
    4. Figure. Lateral view of the club of specimen 2 of M. danae, 45 mm total length, ca. 20 mm ML (without tail). 16°N, 62°W. Drawing from Joubin (1933).

  3. Head
    1. Funnel pocket unknown.

  4. Funnel locking-apparatus
    1. Funnel locking-apparatus with a very large tragus and a distinct antitragus.
    2. Figure. Funnel/mantle locking-apparatus of M. danae. Left - Ventral view of funnel component. Right - Dorsal view of mantle component. Drawings from Joubin (1933).

  5. Mantle and Skin
    1. Mantle and other skin, except fins, covered with small, cartilagenous tubercules.
    2. Tubercules absent from a 17 mm total length specimen.
    3. Figure. Left - Side view of the head of M. danae, ca 45 mm ML. Right - Shape of tubercules. A - External view. B - Side view. Drawings from Joubin (1933).

  6. Fins
    1. Fins longer than broad.
    2. Long tail present in small paralarvae but nearly absent in large paralarvae.
    3. Figure. Fins and tail of M. danae, specimen 2 (ca. 20 mm ML, without tail). Drawing from Joubin (1933).

  7. Photophores
    1. Photophores absent.

  8. Pigmentation
    1. Few chromatophores present.

  9. Measurements
    Total length 61 mm to tip of arm IV 45 mm to tip of tentacle
    Mantle length (without fins) 25 mm
    Mantle length (with fins)* 46 mm
    Head width 17 mm
    Head length 7 mm
    Fin length 25 mm 11 mm*
    Fin width 17 mm 7 mm
    Arm I, length 3 mm
    Arm II, length 5 mm
    Arm III, length 4 mm
    Arm IV, length 14 mm
    Tail < 1 mm* 9 mm
    Tentacle length -- 45 mm
*Estimated from drawing.

Comments

This description is taken from Joubin (1933). M. danae is known only from paralarvae and may represent the young stage of a known species. perhaps M. atlantica.

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Distribution

Range Description

This species is known from the localities in the North Atlantic of the three specimens originally described by Joubin (from southeast of the Azores, near the Antilles and east of the Canary Islands) and from off Somalia (Salcedo-Vargas 1997). Because of taxonomic confusion in the family, distribution records should be treated with caution.
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Type locality: North Atlantic; 34°40'N, 33°16'W, SE of the Azores; 16°03'N, 62°29'W near the Antilles; 30°51'N, 21°00'W east of the Canary Islands.

Salcedo-Vargas (1997) described four specimens (15-30 mm ML) from off Somalia, western Indian Ocean.

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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Members of the Mastigoteuthidae family are deep water pelagic or benthopelagic squids that have a vertical distribution of 500 to 1,000 m during the day and rising up at night to shallower depths (50 to 100 m) (Roper and Sweeney 1992). They appear to have planktonic paralarval young (Roper and Sweeney 1992). Mastigoteuthis species are reddish in colour and have an elongate, solid pair of fourth arms as well as elongate, thin tentacles (Norman 2003). The tentacles are covered in small suckers, which are probably used to catch small crustacean prey from off or near the seabed floor (Norman 2003). Little is known about the biology and ecology of this particular species.

Systems
  • Marine
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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
2014

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

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

Contributor/s
Duncan, C.

Justification
Mastigoteuthis danae belongs to one of the most taxonomically confused families of squid. Because the species are not yet properly delineated, it is impossible to make inferences on their distribution and population size. We therefore consider all species of squid in this family to be Data Deficient. Further research is recommended in order to better understand the taxonomy, precise distribution, population dynamics, life history and ecology, and the 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 unknown.
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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 taxonomy, precise distribution, population dynamics, life history and ecology, and potential threat processes affecting this species.
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Wikipedia

Idioteuthis danae

Idioteuthis danae is a species of whip-lash squid. Known only from specimens of paralarvae, the species may be the juvenile form of M. atlantica.

References

  • Joubin, L. 1933. Notes préliminaires sur les Céphalopodes des croisières du Dana (1921-1922). 4e Partie. Annales de l'Institut Océanographique 13: 1-49.
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