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Laubieriopsis brevis (Hartman 1967)

Description

provided by NMNH Antarctic Invertebrates

“Fauveliopsis brevis, new species

(Plate 37, Figs. A, B)

Record: 1:13 sta. 749 (1); 2: 3 sta. 208 (4);

6:11 sta. 558 (1); 7: 2 sta. 474 (1); 9:la sta. 740 (6, TYPE).

Description: Small perhaps mature individuals measure 3 mm long by 0.56 mm wide and consist of 28 setigerous segments (Fig. A); the last segments are shortest, and others are cylindrical, with segmental lines obscure. The anterior end is truncate, with withdrawn prosto­mium and rounded first segment, marked chiefly by the short acicular spines of the first segment; parapodia are short, papillar throughout and identifiable chiefly by the sparse setal fascicles in lateral position. The pos­terior end terminates in a pair of lateral papillae at the sides of the broad pygidium.Segmental grooves are indistinct medially but marked laterally by the parapodial setae.

The first segment has short, lateral biramous parapodia with char­acteristic acicular spines; the notopodium (Fig. B) has two slenderer, slightly curved spines and the neuropodium has a much thicker, curved spine accompanied by a slenderer one; a broad interramal space has a spherical papilla. The second segment has similar parapodia but their setae are slenderer spines. More posterior parapodia have slenderer setae, resembling those in front but less modified; all are simple, distally pointed, and obscurely barred.

Fauveliopsis brevis differs from F. challengeriae, the only other known species of the genus, in having 28 segments. Interramal papillae are spherical instead of distally expanded and nail-like; the cephalic re­gion is truncate instead of tapered.

Distribution: Off Santiago, Chile, in 1007 m; off southwestern Chile, in 957 m; Falkland Islands, in 646-845; Shag Rocks, in 3495-3537; Drake Passage, in 384-494 m.”

(Hartman, 1967)