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Comprehensive Description

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Description

Psychroteuthis glacialis, Thiele, 1921

 

 

Sta. 91, November 5, 1965. Trawling depth 410-396 m. 1♀; ML – 128 mm

 

Sta. 200, March 15, 1965. Trawling depth 560-730 m. 1♀; ML - 131 mm

 

 

A single species of this endemic antarctic genus has been described (Thiele, 1921) from the fragments of some specimens taken from the stomachs Weddell seals and penguins in the Antarctic. There have been no records of living specimens until now. Therefore description of our specimens would be useful.

 

Description. (Fig. 6) The mantle cylindrical, tapering rapidly from the beginning of the fins. The anterior mantle margin is slightly produced dorsally in the midline, while ventrally it is emarginated beneath the funnel with small lateral lappets (Fig. 6a).

 

The fins are large, rhomboidal, wider than long, with the length slightly exceeding half the mantle length.

 

The head is narrower than the mantle, with small eyes and 2 neck folds on each side of the head.

 

The funnel is wide at its base, and tapers rapidly to the safe end. It is short and reaches to about the level of the eyes. The funnel organ consists of an inverted V-shaped dorsal pad with a small papilla in the middle of its ante­rior margin and 2 ventral oval pads.

 

The funnel cartilage is simple with a somewhat sinous, longitudinal groove. The corresponding member on the mantle is a ridge of the same length.

 

The arms are moderately long, stout in the base, gradually tapering to the end. Their suckers are biserial and are protected on either side by a low protective membrane. The suckers are provided with smooth horny rings except the terminal ones which have finely toothed rings (Fig. 6e).

 

 

TABLE 2. The measurements (mm) and indices of 2 specimens of P. glacialis

                                                     
 

 
 

 
 

 
 

ML

 
 

128

 
 

131

 
 

MWI

 
 

-

 
 

24.4

 
 

FLI

 
 

57.7

 
 

57.2

 
 

FWI

 
 

71.8

 
 

64.8

 
 

arms

 
 

I

 
 

44.5

 
 

56.4

 
 

 
 

II

 
 

53.1

 
 

59.5

 
 

 
 

III

 
 

51.5

 
 

57.2

 
 

 
 

IV

 
 

50.7

 
 

55.7

 
 

 

 

The tentacles are considerably longer than the arms, with the strong, slightly expanded clubs curved like palms (Fig. 6b). The club bears 4 rows of suckers with horny rings provided with sharp teeth bent outwards (Fig. 6f). The central suckers have 25-26 teeth. Some of the suckers of the central rows are distinctly larger than the outer ones. The distal part of the club bears minute suckers which sit in 5 rows. At the base of the club there is a row of mi­nute adhesive suckers and pads which run along the tentacle stalk.

 

The gladius is lanceolate, weak and transparent, with a short rachis, rather wide and long vane, the margins of which are fused in the distal part and form a pocket without a bottom (Fig. 6c). The gladius does not reach the end of the body.

 

There are no photophores. The skin is thin and lightly coloured.

 

Both specimens are females with ova­ries and nidamental glands insignifi­cantly developed.”

 

 

(Filippova, 1972: 398-400)

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Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© National Museum of Natural History, Smithsonian Institution

Source: Antarctic Invertebrates Website (NMNH)

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