Comprehensive Description

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Description

Vermiliopsis notialis, n.sp.

 

St. 148. 9. i. 27. Off Cape Saunders, South Georgia. From 54° 03' S, 36° 39' W to 54° 05’ S, 36° 36' 30" W. 132-148 m. Gear OTL. Bottom: grey mud and stones. Two specimens.

 

DESCRIPTION. Along and across a Cidarid spine is a number of small Serpulid tubes, in contact all their length with the substratum. They have large peristomes and three parallel toothed crests, recalling those of the Mediterranean V. multicristata. Unfortu­nately I was unable to extract a worm from them in any but a very poor condition. The measurements are about 10 mm. by ∙5 mm. Owing to the bad condition I cannot with certainty discover the number of thoracic chaetigers. There are probably seven, the usual number for the genus. I am also unable to give an account of the collar and thoracic membrane. A thoracic membrane is at any rate present. Each branchial lobe (Fig. 87, a) has six rather short filaments, which are adherent and have the barbules continued to the tip (Fig. 87, b). The opercular peduncle has neither barbules nor wings. The operculum itself (Fig. 87, c and d) is a vesicular body, surmounted by a long cone ending in one example in a cup-like disk. The cone is covered with long chitinous spines except for a triangular area running up its outer face.

 

The 1st chaetiger has limbate bristles (Fig. 87, e) and fine capillary bristles (Fig. 87, f) with a denticulated edge. The remaining thoracic notopodia have similar bristles, and from the 3rd chaetiger backwards a number of Apomatus bristles (Fig. 87, g) in addition. The thoracic hooks (Fig. 87, h) have 10 to 12 teeth of which the basal is far the most prominent: this tooth is not excavated. The abdominal hooks are similar in form, but smaller. The ventral abdominal bristles (Fig. 87, i) are geniculate, and in the posterior abdominal segments there are a number of simple capillary bristles (Fig. 87, k). I figure a portion of a tube (Fig. 87, 1).

 

REMARKS. The description of this species must remain incomplete until the acquisition of more and better material. The operculum with its chitinous spines seems to be charac­teristic. In fact, under the present system of using rather wide variations in the oper­culum as generic differentials, it might justify the establishment of a new genus. On the other hand, in all characters except the operculum, the species agrees with Vermilopsis; and the reduplication of Serpulid genera based on differences in the operculum alone is to be deprecated.”

 

(Monro, 1930)

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© National Museum of Natural History, Smithsonian Institution

Source: Antarctic Invertebrates Website (NMNH)

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