Paratherochaeta orensanzi Salazar-Vallejo 2013, n. sp.

• Main Author: Salazar-Vallejo, Sergio I.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2013
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Terebellida; Flabelligeridae; Paratherochaeta; Paratherochaeta orensanzi; Antarctic; Argentina; Antarc*
• Online Access: https://zenodo.org/record/7191317; https://doi.org/10.5281/zenodo.7191317

Paratherochaeta orensanzi n. sp. (Fig. 12) TYPE MATERIAL. — Southwestern Atlantic Ocean. Holotype (MACN 39031) and paratypes (two in MACN 39032; one in ECOSUR; one in MNHN), stomach contents of reticulated raja, Psammobatis bergi Marini, 1932, female, 35 cm long (L18 N3), R/V Chiarpesca 59, Cruise REDE 04, 105 m, X-XI.2006 (paratypes anterior fragments 28-34 mm long, 3-4 mm wide, cephalic cage chaetae broken, 18-23 chaetigers; sediment grains small; chaetiger 2 displaced anteriorly; falcate dark neurohooks from chaetiger 5; gonopodial pores in chaetiger 5). ETYMOLOGY. — This species is named as a modest homage to Dr. José M. (Lobo) Orensanz, in recognition of his fine publications on South Atlantic and Antarctic polychaetes and as a means to thank him for providing materials from his collections. TYPE LOCALITY. — Off Central Argentina, Southwestern Atlantic Ocean. DISTRIBUTION. — Only known from the type locality, found in the stomach contents of a ray (P. bergi) caught in 105 m. DESCRIPTION Holotype broken posteriorly, body wall damaged (Fig. 12A), whitish anteriorly, darker in median and posterior chaetigers. Body medially swollen, tapered anteriorly, posteriorly widening; 29 mm long, 3 mm wide, cephalic cage chaetae 8 mm long, broken, 20 chaetigers. Tunic thin, most sediment particles lost; anterior body papillae long, tapered, median papillae shorter, posterior papillae larger, medially swollen. Cephalic hood exposed, cylindrical, made by two similar sized rings. Cephalic hood margin smooth. Anterior end exposed, partly damaged. Prosomium projected cone, eyes not seen (Fig. 12D). Caruncle not reaching branchial plate margin. Palps and branchiae lost. Branchiae arranged into two marginal dorsolateral groups, about 36 filaments per side. Nephridial lobes placed between branchial rows. Cephalic cage partly damaged, remaining chaetae three times as long as body width. Chaetigers 1-2 involved in cephalic cage, chaetiger 2 displaced anteriorly; chaetiger 3 with chaetae shorter, not contributing to cage. Cephalic ...