Overview

Brief Summary

Introduction

M. famelica is one of two common Mastigoteuthis species in the region of the Hawaiian Archipelago.

Brief diagnosis:

A member of the M. glaukopis Group with ...

  • a Pacific Ocean Distribution.
  • barely detectable protective membranes on tentacular clubs.

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Comprehensive Description

Nomenclature

The holotype is no longer extant (Sweeney, et al., 1988) and we designate the specimen described here (immature female, 241 mm ML), Museum No. xxx, as the neotype. Nesis (1980) incorrectly synonymized this species (it had been incompletely described at the time as Chiroteuthis famelica) Berry, 1909 with Chiroteuthis acanthoderma (= Asperoteuthis acanthoderma).

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Characteristics

  1. Tentacles
    1. Club with barely detectable protective membranes.
    2. Club suckers uniform in size over club until club diameter diminishes near tip where suckers become smaller.

      Figure. Four views of the club of M. familica, preserved, neotype. Left - Oral view in midregion of club. Left middle - Side view in midregion of club at lower magnification. Right middle - Aboral view in midregion of club. The distinctive mantle pigmentation is seen in the background. Right - Oral view of club base. The separate sucker patches on the latter may be an artifact of damage. The tentacle is a bit shriveled from long preservation. Photographs by R. Young.

    3. Club suckers slightly elongate, 0.36 mm in length, with 2-3 large, blunt knobs on each side of outer ring that project into aperature. Inner ring with 2 or 3 tiny rounded teeth on distal margin.
    4. Figure. Oral view of preserved club suckers of M. famelica, neotype.

    Scanning electron micrographs of the suckers can be found here.

  2. Head
    1. Beaks. Description of the beaks can be found here.
    2. Beaks: Descriptions can be found here: Lower beak; upper beak.
  3. Fins
    1. Fins slightly longer than broad.
    2. Anterior and posterior fin lobes absent.

  4. Photophores
    1. Eyelid photophore present; other photophores absent.
    2. Figure. Lateral view of the head of M. famelica showing eye size and size of eyelid photophore (arrow), immature female, 140 mm ML, preserved, Hawaiian waters. The rather large eyelid photophore (ca 2.3% of ML in longest measurement) may be hidden by pigmentation. Photograph by R. Young.

Comments

More details of the description can found here.

M. famelica is very similar to M. atlantica from the central North Pacific in having large eyelid photophores, absence of all other photophores and fins that are slightly longer than wide. These two species clearly differ, however, in the size of the protective membrane on the tentacular clubs (well developed in M. atlantica and nearly absent in M. famelica). The small (37 mm ML, holotype) M. glaukopis from the Indian Ocean as described by Chun (1910) is very similar except for differences in the size and dentition of the club suckers. Since these latter features change with size, we can find no differences that separate M. glaukopis Chun, 1908 and it is probably synonymus with M. atlantica Joubin, 1933 or M. famelica Berry, 1909, but has priority over both. Until larger specimens of M. glaukopis are available from the Indian Ocean, we maintain all three species. We suspect, however, on the basis of the distinct protective membrane on the tentacular club in the illustrations of Chun (1910) that M. glaukopis and M. atlantica may be synonymus.

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Distribution

Range Description

This species is known from the Pacific Ocean in the region of the Hawaiian Islands (Young 2010). Because of taxonomic confusion in the family, distribution records should be treated with caution.
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Type locality: Vicinity of Kauai Island, Hawaiian Islands. Known only from the central north Pacific Ocean to about 3°S.

Vertical distribution

According to Young (1978), most specimens captured in his study were taken at depths between 675 and 800 m, both day and night. The two presummed contaminants were taken at 240 m during the day; the previous tow had fished at 700 m and captured three specimens.

Figure. Vertical distribution chart of M. famelica. Captures were made with both open and opening/closing trawls. Bar - fishing depth-range of opening/closing trawl. Circle - Modal fishing depth for either trawl. Blue-filled circle - Night capture. Yellow-filled circle - Day capture. Unfilled circle - probable contaminant from previous tow. Note the breaks in the x-axis. Chart modified from Young (1978).

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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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Depth range based on 14 specimens in 1 taxon.

Environmental ranges
  Depth range (m): 240 - 1000

Graphical representation

Depth range (m): 240 - 1000
 
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

Figure. Ventral and dorsal views of two Paralarval stages of M. famelica. Thumbnail (far left): Ventral view showing relative sizes of the two paralarvae. Left - 4.8 mm ML paralarva, Hawaiian waters. Right: 8.5 mm ML paralarva, Hawaiian waters. Drawings from Young (1991).The scale bar is l mm.

Paralarvae

At 5 mm ML M. famelica paralarvae are separated from similar-sized paralarvae of M. microlucens, the only other common mastigoteuthid in Hawaiian waters, by the more slender shape, smaller eyes, more anterior digestive gland and tentacular suckers and chromatophores extending much of the tentacle length.

At 7-9 mm ML arms III are only small papillae; the mantle is very slender; fins are large (length 1/3 of ML) and without anterior or posterior fin lobes; eyes each have a silvery rostrum projecting ventrally or anteriorly. Funnel organ with tragus and antitragus recognizable at 25 mm ML. At 7-9 mm ML the absence of fin lobes, the slender shape, elongate fins, tentacular stalk suckers and chromatophores also distinguishes M. famelica from M. microlucens. At larger sizes, and, by at least 17 mm ML up to at least 40 mm ML, skin tubercules easily distinguish M. famelica. The differences between the two species diminish at sizes below 5 mm ML. The position of the digestive gland appears capable of distinguishing M. microlucens to at least 3.5 mm ML although the smallest M. familica paralarva examined was 4.8 mm ML.

Tubercles in paralarvae

Small multicuspid tubercles on mantle, funnel, head and aboral surface of arms seen in young of 17 - 42 mm ML. Most of the head tubercules are not visible in the photograph at the right but some on the funnel and its enlargement are visible.

Figure. Left - Lateral view of preserved head and funnel of a paralarva of M. famelica, 35 mm ML, Hawaiian waters. Right - enlargement of a portion of the funnel, 35 mm ML, Hawaiian waters. Paralarva stained with methylene blue. Photographs by R. Young.

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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 famelica 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 famelica

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