Comprehensive Description

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Description

Opercular lobes completely divided into two free lobes, operculum similar to maximum width or shorter. Operculum with distal end slope absent (opercular disc perpendicular to longitudinal axis); opercular papillae digitiform, twice longer than wide. Number of opercular papillae 8–10. Form of tentacular filaments simple (unbranched). Oral plates absent, or present. Palps shorter or similar in length to operculum. Medial organ (cirrus) at dorsal junction of lobes present. Number of outer paleae 8–40; arrangement of outer paleae in spirals. Angle of blades and axis of shafts straight; blade of outer paleae cylindrical. Outer paleae denticles on lateral margins absent, arrangement opposite; similar in length along paleae. Distal margins of outer paleae smooth. Outer paleae medial plume absent. Tip of outer paleae symetrical. Middle paleae absent. Number of inner paleae 2–5 pairs; inner paleae giving the appearance of 1 row. Arrangement of inner paleae in short line on juncture of lobes, angle of blades and axis of shafts straight; blade of inner paleae cylindrical, like spines. Inner paleae with internal fusiform outline absent. Medial organ present. Nuchal spines or hooks present; number of nuchal spines or hooks 2–5 pairs; tip shape of spines bent, hooklike. Limbation on hooks present, on the concave side of hooks. Neuropodia on segment 1 with 1 pair(s) of cirri. Neurochaetae on segment 1 present. Number of lateral lobes on segment 2: 2 pair(s). Number of parathoracic segments 2. Thoracic branchiae present. Parathoracic neurochaetae with lanceolate and capillary forms. Branchiae in posterior abdominal segments absent. Dorsal papillae absent.

Description generated from: Hutchings, P.A., Capa, M., & Peart, R. 2012. Revision of the Australian Sabellariidae (Polycheata) and description of eight new species. Zootaxa, 3306: 1-60.

Additional references:
Marenzeller, Emil von 1895. Phalacrostemme cidariophilum, eine neue Gattung und Art der Hermelliden. Anzeiger, Akademie der Wissenschaften, Wien, 32: 191-192.

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© Wilson, Robin

Source: Annelida LifeDesk

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