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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 spherical, slightly longer than wide, or digitiform, twice longer than wide. Form of tentacular filaments compound (branching). Oral plates absent. Palps shorter or similar in length to operculum. Medial organ (cirrus) at dorsal junction of lobes present. Number of outer paleae 12–42; arrangement of outer paleae in semicircles. Angle of blades and axis of shafts geniculate (forming an angle); blade of outer paleae flat. Outer paleae denticles on lateral margins absent, arrangement opposite. Distal margins of outer paleae denticulated. Outer paleae medial plume present, or absent; smooth, or with denticles. Tip of outer paleae markedly asymetrical. Middle paleae present; number of middle paleae 4–31 pairs; pointing towards the edges of operculum. Middle paleae one type only, or two types, long and short forms; angle of blades and axis of shafts geniculate (strongly geniculate); blade of middle paleae concave, excavated. Number of inner paleae 5–35 pairs; inner paleae giving the appearance of 2 rows. Arrangement of inner paleae in semicircles, angle of blades and axis of shafts geniculate (strongly geniculate); blade of inner paleae concave, excavated. Inner paleae with internal fusiform outline absent. Medial organ present, or absent; eye spots on sides of medial ridge or medial organ present, or absent. Nuchal spines or hooks absent, or present; number of nuchal spines or hooks 3–6 pairs; tip shape of spines straight, spinelike. Neuropodia on segment 1 with 1 pair(s) of cirri. Neurochaetae on segment 1 present. Number of lateral lobes on segment 2: 1 pair(s). Number of parathoracic segments 1. Thoracic branchiae present. Parathoracic neurochaetae with lanceolate and capillary forms. Branchiae in posterior abdominal segments present. Abdominal uncini with 2 rows of teeth. 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:
Linnaeus C. Von. 1767. Systema naturae sive regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Laurentii Salvii, Holmiae. Stockholm, 12th edition, 1, 533-1327.

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© Wilson, Robin

Source: Annelida LifeDesk

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