Comprehensive Description

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Description

"Dilepidonotus falklandicus, new species

 

(Plate 2)

 

 

Record: 6:11 sta. 558 (1, TYPE).

 

 

Description: Length of body is 33 mm, width 8 mm without, and 12 mm with, parapodia, and setigerous segments number 26. The body is broadly depressed and blunt at both ends. The prostomium (Fig. A) is a long, flat lobe without color or eyes; the appendages of the frontal an­tennae are fallen away but their bases are long, linear and continuous with the prostomium ; the base of the median antenna is much thicker and extends farther forward than that of the paired antenna. Palpi are thick, taper distally and surpass other cirriform appendages in thickness and length. First parapodia are smallest, directed forward and have few acicular spines. The second parapodia are directed obliquely forward, at the sides of the prostomium.

 

Elytra, numbering 12 pairs, are detached for the most part; all are heavily fimbriated along the outer half and smooth along the inner half. Median elytra are broadest laterally and taper medially. An elongated scar, near the outer edge, is surmounted by a patch of globular vesicles (Fig. C). Median parapodia (Fig. B) have large pseudoelytra directed medially so that the two of a pair nearly meet middorsally. The mid­dorsum of each segment has a broad crest, resembling that in species of Barrukia; a slight nuchal flap extends over the posterior end of the prostomium. Nephridial papillae are long, pedunculate, and first present from the fourth segment; they continue, with increasing size, posteriorly. Ventral and dorsal cirri are slender, cirriform; the dorsal are longer. Notosetae (Fig. D) are numerous, very slender, silky, occur in short tufts emerging from small notopodia. Neurosetae (Fig. E) are much thicker, coarse, dark brown, and occur in linear series extending from the long, distally truncate neuropodium.

 

 

Distribution: Falkland Islands, in 646-845 m."

 

 

(Hartman: 1967)

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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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