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Comprehensive Description

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Description

Amphitretus pelagicus, n. sp.

 

 

The Body is short, rounded, of gelatinous consistency, and semitransparent. The mantle adheres to the sides of the siphon, so that the mantle-opening, which is single in all other known Cephalopods, is here divided into two pocket-like openings, which lie one beneath each eye. The siphon is very long and narrow, and extends forwards anteriorly to the margin of the mantle, for a distance almost equal to the length of the body, and is a little swollen at the extremity.

 

The Head is undistinguishable from the body except by the possession of the eyes, which are situated near together on the dorsal surface; they consist of a larger basal spheroid, through the walls of which pigment is clearly visible, upon which stands a smaller, very prominent spheroid, white, opaque, and of glistening surface.

 

The Arms are equal and rather more than twice as long as the body; they are slender, and taper at first gradually and then more rapidly to comparatively blunt points. The um­brella extends more than two thirds up the arms, and is thin, delicate, transparent, and much damaged. The suckers are firm, muscular cups embedded in the softer tissue of the arms, as in Cirroteuthis; there are about twelve placed at some distance apart on that portion of the arm up which the web extends, and eleven closely set and showing a tendency to biserial arrangement on the free extremities. There are no cirri nor is there any trace of the formation of a hectocotylus.

 

The Surface appears to have been quite smooth originally; there is no sign of any cirri or warts.

 

The Colour is a dull yellow, apparently due to preservation in picric acid, and the mantle and umbrella are thickly sprinkled with small brown chromatophores.

 

Hab. Near the Kermadec Islands, South Pacific; on the surface (Station 171). One specimen, sex ?”

 

 

(Hoyle, 1885: 235-236)

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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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