Echinoderes cf. angustus, Higgins and Kristensen, 1988

Sánchez, Nuria, García-Cobo, Marta, Shimabukuro, Mauricio, Zeppilli, Daniela, Nomaki, Hidetaka & González-Casarrubios, Alberto, 2024, Discovery of a new Kinorhyncha species from the uncharted South Orkney Trench (Southern Ocean), Zoologischer Anzeiger 313, pp. 315-331 : 323-325

Echinoderes cf. angustus ( Fig. 6 and Table 3)

Material examined: female, collected in 2019/12/19 at South Orkney Trench, Southern Ocean : Station A 5200; Coordinates 60 ◦ 52′ 30.000″ S, 41 ◦ 36′ 2.400″ W; at 5.251 m depth; mounted in DMHF, deposited at NHMD under catalogue number: NHMD-1790787 .

3.2.1. Brief description

Echinoderes with middorsal spines present on segments 4 to 8, and spines in lateroventral positions on segments 6 to 9. Tubes in lateroventral positions on segment 5. Glandular cell outlets type 2 in subdorsal, laterodorsal, sublateral and ventrolateral positions on segment 2, subdorsals on segment 4, midlateral on segment 5,sublateral on segment 8 and laterodorsal on segment 10.

Adults with head, neck and eleven segments. Overview of measures and dimensions are given in Table 3.

Segments 1 and 2 as complete cuticular rings ( Fig. 6 A and B). Segment 1 with a single middorsal glandular cell outlet type 1 and a pair in lateroventral positions ( Fig. 6 A and B), plus subdorsal sensory spots. Segment 2 with subdorsal, laterodorsal, sublateral and ventrolateral glandular cell outlets type 2, plus a single middorsal glandular cell outlet type 1 and a pair in ventromedial positions, and subdorsal and ventromedial sensory spots (likely also in midlateral positions) ( Fig. 6 A and B). Segment 3 without any conspicuous cuticular structures ( Fig. 6 A and B), except for a single middorsal glandular cell outlet type 1, a pair in ventromedial positions, plus subdorsal sensory spots (likely also in sublateral positions). Segment 4 with acicular middorsal spine, subdorsal glandular cell outlets type 2 ( Fig. 6 A–D), plus paradorsal and ventromedial glandular cell outlets types 1, present on this and following five segments. Segment 5 with acicular middorsal spine and lateroventral tubes, midlateral glandular cell outlets type 2, and subdorsal and ventromedial sensory spots ( Fig. 6 C–F). Segment 6 with acicular middorsal and lateroventral spines, plus subdorsal and ventromedial sensory spots (likely also in paradorsal and midlateral positions) ( Fig. 6 D–E, H). Segment 7 with acicular middorsal and lateroventral spines, and ventromedial sensory spots (likely also in paradorsal and midlateral positions) ( Fig. 6 D–E, G). Segment 8 with acicular middorsal and lateroventral spines, plus sublateral glandular cell outlets type 2 ( Fig. 6 E–G), and paradorsal sensory spots. Segment 9 with lateroventral spines, and sensory spots in paradorsal, subdorsal and ventrolateral positions (likely also in midlateral positions) ( Fig. 6 G–K). Rounded, small sieve plates in sublateral positions. Segment 10 with laterodorsal structure, likely glandular cell outlets type 2 ( Fig. 6 G–I), single middorsal glandular cell outlet type 1 and a pair in ventromedial positions, plus laterodorsal and ventromedial sensory spots ( Fig. 6 G–K). Posterior edge of segments 1 to 10 with primary pectinate fringe. Segment 11 with long lateral terminal spines, thin lateral terminal accessory spines, sensory spots in subdorsal positions and two glandular cell outlets type 1 located middorsal. Conspicuous protuberance, pointed forward in middorsal position ( Fig. 6 J). Tergal extensions short and triangular ( Fig. 6 L). The posterior margins of the sternal plates rounded, shorter than tergal extensions.