Polycirrus coibensis Glasby & Hutchings 2014, n. sp.
Creators: name: Glasby, Christopher J.
name: Hutchings, Pat
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Terebellida
Terebellidae
Polycirrus
Polycirrus coibensis

description: Polycirrus coibensis n. sp.
Figs 18a–e, 19a–f
Polycirrus sp. A. Capa, 2003: 335–336.
Type locality. Pacific coast of Panama.
Material examined. HOLOTYPE: Panamá, Parque Nacional de Coiba, Isla de Granito de Oro, Stn CM1 J96, 7º35ʹ30′′ N, 81º42′20′′ W, 2.3 m, dead coral substrate, MNCN 16.01 /14703, PARATYPE AM W43207. Both from same locality.
Description. Holotype complete, gravid, 18 mm long, 1 mm wide, about 75 chaetigers (Capa 2003). Dorsum anteriorly smooth. Venter anteriorly with mid-ventral groove and discrete ventro-lateral pads; pads more-or-less smooth, extending from segment 2 to 10. Mid-ventral groove from segment 3, not extending posteriorly beyond segment 10 (Figs 18a, 19f).
Buccal tentacles numerous, of three types: (1) leaf-shaped, deeply furrowed, (2) cylindrical, thickened distally, distinctly grooved, and (3) cylindrical, uniformly thin, weakly grooved, all arising dorsally on prostomial ridge. Prostomial ridge slightly curved, not extending laterally. Upper lip trefoiled with lateral, blindly ending enclosed diverticulae, margin of medial lobe thickened and overturned; oral surface glandular and ciliated. Inner lower lip circular, smooth; outer region flat, shield-like (slightly inflated), subtriangular and pointing toward mouth, weakly rugose, extending posteriorly to segment 3. Achaetous segments visible dorsally but obscured by expanded outer lower lip ventrally.
Notochaetigerous segments 39 or 40 (left side 39), extending to segments 41 or 42. Notopodia digitiform, prechaetal lobe low, postchaetal lobe digitiform, slightly longer than prechaetal (Fig. 19a,f). Notochaetae within a chaetiger consisting of two types (chaetiger 3 examined), smooth, narrowly winged and faintly hirsute, uniformly tapered, posteriorly same form as those anteriorly; secondary notochaetae in all chaetigers pinnate (Figs 18b, c; 16d). Neurochaetae beginning on segment 7. Neuropodial tori ridge-like anteriorly or erect pinnules posteriorly. Uncini with short neck and straight to convex base (Type 1), teeth above main fang arranged in double transverse series (MF:3–5:8–10) enlarged median tooth above main fang present, subrostral process absent (Figs 18d, e; 19b, c,e).
Nephridial papillae present, globular. Pre-gular membrane nephridial papillae absent. Post-gular membrane nephridial papillae present, extending from segment 5 to 8; situated at base of notopodia. Pygidium simple rosette.
Comments. Polycirrus coibensis n. sp., appears to be closest to several Polycirrus species described from the Pacific coast of the Americas and P. swakopianus from Namibia. It differs from P. californicus (San Diego) and P. chilensis (Valparaiso) in having a smooth anterior dorsum (tessellated in P. californicus; papillose in P. chilensis) and it differs from P. swakopianus in having digitiform, more slender notopodia and with uncini lacking a subrostral process. Polycirrus coibensis n. sp., differs from P. mexicanus (La Paz, Mexico) in the dentition of the uncini—a single tooth above MF in P. mexicanus versus a double transverse series in P. coibensis n. sp.
Etymology. The species name refers to the type locality, the National Park de Coiba, Panama.
Habitat. In amongst dead coral substrate in shallow water.
description: Published as part of Glasby, Christopher J. & Hutchings, Pat, 2014, Revision of the taxonomy of Polycirrus Grube, 1850 (Annelida: Terebellida: Polycirridae), pp. 1-117 in Zootaxa 3877 (1) on pages 41-42, DOI: 10.11646/zootaxa.3877.1.1, http://zenodo.org/record/4948375