Ampharete cirrata Webster & Benedict 1887

• Main Authors: Krüger, Lotte, Dietrich, Anna, Bastrop, Ralf, Bick, Andreas
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2022
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Terebellida; Ampharetidae; Ampharete; Ampharete cirrata; North Atlantic
• Online Access: https://doi.org/10.5281/zenodo.6992814; http://treatment.plazi.org/id/2F1987D9704C877270AA891CFF33F8F5

Ampharete cirrata Webster & Benedict, 1887 (Figs 4–8) Ampharete cirrata Webster & Benedict, 1887: 748, Pl. VIII, Figs 110–112. Diagnosis. Medium-sized species of up to 21 mm in length and 2.8 mm in width. Twelve thoracic, two intermediate, and ten abdominal uncinigers with very long neuropodial cirri. Branchiae arranged in two groups separated by a median gap of about 1.5 branchial base width; three pairs in anterior transverse row and last pair in posterior position, directly below middle branchia of anterior transverse row. Paleae long and thin with filiform tips, 9–18 each side. One pair of nephridial papillae on segment IV. Pygidium with up to 17 anal cirri, arranged in two (more or less distinct) rows. Material examined. Type material (based on photographs): North Atlantic Ocean, Eastport, Maine (USA). Syntypes of Ampharete cirrata Webster & Benedict, 1887, USNM 457 (3 specimens). Non-type material: Baltic Sea, north from Isle of Rügen. Site 1–5 (Table 1), SBRO-P 95 (23 specimens), SBRO-P 5528 (5 specimens), SBRO-P 17367 (134 specimens), ZSRO-P2669 (16 specimens), ZSRO-P2670 (15 specimens). Description. Complete specimens 11–21 mm long and 1.7–2.8 mm wide in thorax (Fig. 4A). Prostomium trilobed; median lobe U-shaped and separated by deep lateral grooves (Figs 5A, 6B,E); prostomial glandular ridges and eyespots absent. Nuchal organs not observed. Buccal tentacles papillose (Fig. 6A,C). Four pairs of branchiae arranged in two distinct groups with a median gap of about one and a half times the width of branchial bases (Fig. 5A); branchiae not fused at base; branchiae thick at base and gradually tapering towards distal end, longest branchiae reaching thoracic chaetiger 5–9 (Figs 4A, 6E); anterior three pairs of branchiae arranged in a transverse row on segment II/III, fourth pair slightly posterior to anterior row, directly below middle branchia of transverse row (Fig. 5A, branchial bases can be slightly deformed and displaced through fixation); branchiae of segment II in 2nd outermost position of ...