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Comprehensive Description

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Description

Aricidea belgicae (Fauvel).

 

(Fig. 16.)

 

Paraonis belgicae Fauvel, 1936, 29, fig. 3a–e.

 

Sta. 107. 66° 45' S., 62° 03’ E., off MacRobertson Land, D R L, 219 m. (3).

 

Distribution : Off Alexander I Land and MacRobertson Land.

 

These specimens agree closely with Fauvel's account, except that they have a small tentacle which was not present in his example. The tentacle is present in two out of the three specimens, and in the third there is no trace of it. In my opinion the tentacle had been broken off in Fauvel's example. The prostomium (fig. 16a) is bluntly conical and divided into three lobes by a pair of deep nuchal grooves, and the anterior end is separated by a light furrow from the median pad which bears the single, rather thick, tentacle. I see no ciliated button in front. Ventrally the first two chaetigers are involved with the mouth (fig. 16b).

 

The anterior region is flattened, and in the middle region there are reddish-brown, seg­mental transverse bands on the ventral surface. None of the specimens is complete, and the largest measures 15 mm. by 2 mm. at the widest part for 72 chaetigers. The gills begin at the fourth chaetiger and end on the 19th, 22nd and 24th chaetigers respectively. They have small cirriform terminal points exactly as figured by Fauvel. The bristles are much more numerous in the anterior region than in the middle, and they consist of capillary bristles only. With Fauvel I can find neither lyre-bristles nor hooks. The feet and dorsal cirri are as figured by Fauvel.

 

The genus Aricidea carries modified bristles in the posterior ventral rami. In this species they are absent, and it is therefore not strictly capable of inclusion within the genus. Aricideop­sis Johnson appears to be the same as Aricidea, and Cirrophorns Ehlers has modified bristles in the posterior dorsal rami. Paraonis Grube, to which Fauvel attributed the species, has no median tentacle.”

 

 

(Monro, 1939)

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© National Museum of Natural History, Smithsonian Institution

Source: Antarctic Invertebrates Website (NMNH)

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