Amphiglena Claparède, 1864

Giangrande, Adriana, Putignano, Matteo, Licciano, Margherita & Gambi, Maria Cristina, 2021, The Pandora’s box: Morphological diversity within the genus Amphiglena Claparède, 1864 (Sabellidae, Annelida) in the Mediterranean Sea, with description of nine new species, Zootaxa 4949 (2), pp. 201-239 : 204

Genus Amphiglena Claparède, 1864

Type species: Amphicora mediterranea Leydig, 1851 , subsequent designation by Bush (1905).

The following diagnosis is based on that by Fitzhugh, 1989, revised by Capa & Rouse (2007).

Diagnosis: Small-sized sabellin species bearing 5 to 8 pairs of radioles; radiolar skeleton with two rows of cells. Palmate membrane and radiolar flanges absent. Dorsal lips with dorsal radiolar appendages; dorsal pinnular appendages absent. Ventral lips absent; parallel lamellae absent. Ventral basal flanges of branchial crown present, as a pair of thin, erect, membranous flanges extending from the base of radioles and posteriorly across the anterior peristomial ring to proximal region of ventral-most radioles. Peristomial ring generally divided by a mid-ventral incision. Anterior margin of anterior peristomial ring low, of equal height all around, but often not visible all around because thinner and fused to the posterior ring. Posterior peristomial ring longer than the anterior ring with anterior margin horizontal or prolonged ventrally on both sides of the mid-ventral incision. Posterior peristomial ring collar absent.

Variable number of thoracic chaetigers. Superior thoracic notochaetae broadly-hooded. Inferior thoracic notochaetae paleate, arranged in single transverse row. A single transverse row of abdominal neurochaetae assumed to be anterior row (posterior row absent); composed of elongate, broadly hooded chaetae. Thoracic uncini with teeth above main fang of equal size; hood absent; breast well developed, expanded; handles of variable length. Companion chaetae with distal end slightly inflated, dentate and with a thin mucro extending from this. Abdominal uncini with main fang surmounted by teeth of equal size; breast well developed, handles very short. Abdominal chaetiger not numerous. Pygidial eyes present.