Amythas membranifera Benham 1921

• Main Authors: Schiaparelli, Stefano, Jirkov, Igor A.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2021
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Terebellida; Ampharetidae; Amythas; Amythas membranifera; Princess Elizabeth Land; Terra Nova Bay; Antarc*; Antarctica
• Online Access: https://zenodo.org/record/4531811; https://doi.org/10.5281/zenodo.4531811

Amythas membranifera Benham, 1921 Figs 4, 5 A–E, J–L Amythas membranifera Benham, 1921: 102–105, pl. 10, figs 124–132. Amythas membranifera – Monro 1939: 141–142, fig. 24. Material examined ANTARCTICA • 1 ♂ (BL = 55 mm, 20 AU); Terra Nova Bay; -74.67597º S, 164.24592º E; depth 400 m; 30 Jan. 2014; Schiaparelli leg.; station: DR5; XXIX PNRA expedition (2013-2014); MNA- 07940 • 1 ♂ (BL = 55 mm, 19 AU); same collection data as for preceding; MNA-07939 • 1 ♂ (BL = 13 mm, 17 AU); same collection data as for preceding; MNA-07935 • 1 ♂ (BL = 45 mm, 18 AU); same collection data as for preceding; MNA-07934 • 1 spec., undetermined sex; Princess Elizabeth Land; -67.05000º, 74.48333º; depth 437 m; station: 103; BMNH 1941.3.3.126–127. Description BODY. Body (Fig. 4 A–C) short and thick. Length 13–55 mm, width 9–20 mm; girth of body spindleshaped, increasing to the middle of thorax, decreasing thereafter. PROSTOMIUM. Prostomium trilobed, middle lobe anteriorly broadly rounded; any additional structures (nuchal organs, ridges, horns etc.) absent. BUCCAL TENTACLES. Buccal tentacles numerous, short, smooth, attached behind a large-folded membrane. Lower lip broad, embracing mouth laterally and slightly latero-dorsally, covered by warts. Paleae totally absent. BRANCHIAE. Three pairs of branchiae, the outermost one originating from TC1, the innermost one from TC2, and the middle one from S2 (Fig. 5C). Branchostyles cirriform, short, organized in a straight line and showing a wide middle gap. Branchostyles and branchophores covered with warts. There are no visible nephridial papillae or nephropores. NOTOPODIA AND NEUROPODIA. 17 TC, notopodia with capillary chaetae from S3; anterior notopodia small, increasing in size from first to third pair; elevated or modified notopodia absent; 14 TU, all thoracic neuropodia well developed, with almost equal size, middle ones slightly bigger than anterior and posterior ones. Ventral shields distinct anteriorly and completely disappearing before the end of thorax. Subdivision of thorax absent. ...