Leitoscoloplos rankini Blake, 2017, new species

• Main Author: Blake, James A.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2017
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Orbiniidae; Leitoscoloplos; Leitoscoloplos rankini; Drake Passage; Weddell Sea
• Online Access: https://doi.org/10.5281/zenodo.4901763; http://treatment.plazi.org/id/8F2387DD0636092BFF31F8AEFCA2FA5C

Leitoscoloplos rankini new species Figures 17–18 Haploscoloplos sp. Hartman 1978: 156 (in part, Glacier Sta. 69-19). Material examined. Drake Passage, ANDEEP I ANT XIX-3, R/V Polarstern , Sta. PS-61/43- 2, 3959 m (1, SEM, JAB); Sta. PS-61/46- 3, 2888 m (1, ZMH P-27799).—Weddell Sea, Glacier Sta. 69- 19, 11 Mar 1969, 74.105°S, 32.603°W, 1622 m, holotype (USNM 1013903); ANDEEP III ANT XXII-3, R/V Polarstern , Sta. PS-67/121- 6, 2618 m (1, ZMH P-27800). Description. Holotype posteriorly incomplete, broken into three parts, 22 mm long, 1 mm wide for 50 setigerous segments; 10 thoracic setigers. Specimen from Sta. PS-61, 46-3 complete, 19 mm long, 0.8 mm wide for 80 setigers; with 11 thoracic setigers. Specimen from Sta. PS-67, 110-11 smaller, complete, in two parts, 7 mm long, 0.4 mm wide for 40 setigers; with 9 thoracic setigers. Thoracic region widest part of body, with 9–11 setigers, rounded in cross section, not depressed (Fig. 17 B). Transition between thorax and abdomen abrupt (Fig. 17 A) or with one transitional segment. Abdominal segments becoming narrow in posterior one-third of body. Branchiae from setiger 18–21, small and stubby at first, becoming thin, about twice as long as notopodial postsetal lobes (Fig. 17 C). Prostomium conical, pointed; no eyespots (Figs. 17 A, 18A); nuchal organs as large slit between prostomium and peristomium (Fig. 18 B). Peristomium with one achaetous ring (Figs. 17 A, 18A). Thoracic segments all similar, with prominent postsetal lobes; notopodial postsetal lobes subtriangular (Fig. 17 B); neuropodial postsetal lobe arising from low postsetal ridge (Fig. 17 B). Middle and posterior abdominal parapodia dorsally elevated; elevated parapodia fused across dorsum, forming raised dorsal crest from which branchiae arise, best observed in posterior abdominal segments (Fig. 18 C). Abdominal notopodia with narrow fingerlike postsetal lobe (Figs. 17 C, 18D); neuropodia elongated, apically expanded, divided into two lobes between which setae arise (Fig. 17 C); without subpodial flange. ...