Comprehensive Description

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Description

Body with fewer than 50 segments. Prostomium with cephalic peaks; median antenna in anterior notch, style smooth; lateral antennae inserted ventrally, styles smooth; anterior pair of eyes dorsolateral on widest part of prostomium, posterior pair dorsal near hind margin of prostomium; palps papillate, tapering.

Tentaculophores lateral to prostomium, each with a single notochaeta and a dorsal and ventral tentacular cirrus. Second segment with first pair of elytra, biramous parapodia, and long buccal cirri.

Fifteen pairs of elytra, covering dorsum (in large specimens dorsum in mid-body region uncovered), on segments 2, 4, 5, 7, then on every second segment to 23, 26, 29, 32; last segments cirrigerous; elytral margin smooth; elytral surface with conical mircotubercles with blunt to pointed tip; thorn-shaped macrotubercles scattered in posterior half of elytron, mainly near outer lateral and posterior margin. Cirrigerous segments with globular dorsal tubercles; dorsal cirri with cylindrical cirrophore and smooth style, slightly inflated subdistally, then abruptly tapering. Ventral cirri with smooth, tapering style.

Parapodia biramous; notopodia of about same size as neuropodia with elongate acicular lobe; neuropodia with elongate prechaetal acicular lobe with digitiform supra-acicular process; neuropodial postchaetal lobe shorter than prechaetal lobe, rounded; tips of noto- and neuroacicula penetrating epidermis. Notochaetae of two kinds independent of size of individual: short, stout notochaetae with rows of spines and more or less pointed tip, and long, stout notochaetae projecting dorsally to meet mid-dorsally with blunt tip and shaft usually smooth (in smaller specimens few rows of spines present distally). Neurochaetae falcate with unidentate tip; one or two neurochaetae with subdistal slit suggesting presence of secondary tooth (but never distinctly bidentate as in Harmothoe).

Size of large specimen, for example: length 50 mm, width 15 mm for 42 segments.

Synonyms

Hermadion ferox Baird, 1865

Harmothoe ferox (Baird, 1865)

Hermadion rouchi Gravier, 1911

Eunoe spica Hartman, 1978

Trusted

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© Ebbe, Brigitte

Source: Southern Ocean polychaetes

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