Echinoderes Yamasaki, Neuhaus, and George 2018
- Dataset
- New species of Echinoderes (Kinorhyncha: Cyclorhagida) from Mediterranean seamounts and from the deep-sea floor in the Northeast Atlantic Ocean, including notes on two undescribed species
- Rank
- GENUS
Classification
- kingdom
- Animalia
- phylum
- Cephalorhyncha
- class
- Kinorhyncha
- order
- Cyclorhagida
- family
- Echinoderidae
- genus
- Echinoderes
description
Although many characters could not be observed because of the broken specimen, Echinoderes sp. 2 can be assumed to represent an undescribed species. However, we do not formally describe the species as a new species, because we had only a single deteriorated specimen available for study.
discussion
Remarks. Echinoderes sp. 2 shares with Echinoderes augustae Sørensen & Landers, 2014, Echinoderes dujardinii Claparède, 1863, Echinoderes gerardi Higgins, 1978, Echinoderes muricatus Pardos et al., 2016 the presence of middorsal acicular spines on segments 4 – 8, lateroventral spines / tubes on segments 5 – 9, lateral accessory spines / tubes on segment 8 and the absence of any tube on the dorsal side on segment 2 (Claparède 1863; Higgins 1977, 1978; Sørensen & Landers 2014; Pardos et al. 2016 a).
materials_examined
Material examined. One adult female (ZMB 11595), collected at station 742 in the deep-sea plain near the Sedlo Seamount (Fig. 1 A, B; Table 1), mounted as glycerol-paraffin slide on a Cobb aluminum frame. Brief description. Adult with head, neck, and eleven trunk segments (Fig. 12 A). See Table 8 for measurements and Table 9 for cuticular structures (sensory spots, glandular cell outlets, spines, and tubes). Further cuticular structures may be present especially on segments 3 – 7 as well as on the ventral side of segment 2, but these were difficult to study because of the broken specimen. Head not examined in detail. Neck with 16 placids. Midventral placid broadest. Remaining placids similar in size. Segment 1 consisting of complete cuticular ring. Sensory spots located at least in subdorsal and laterodorsal position. Type- 1 glandular cell outlets present at least in middorsal and lateroventral position. No spines and tubes present. Segment 2 with complete cuticular ring as segment 1. Sensory spots present at least in middorsal position. Type- 2 glandular cell outlets in laterodorsal position. No spines and tubes on the dorsal to lateral area, but the ventral area could not be observed. Segment 3 and following eight segments consisting of one tergal and two sternal plates. Cuticular structures not observable on segment 3. Segment 4 with middorsal acicular spine (Fig. 12 B). Additional spines and tubes absent. Segment 5 with middorsal acicular spine and lateroventral tubes (Fig. 12 B, C). Additional spines and tubes absent. Segment 6 with middorsal and lateroventral acicular spines (Fig. 12 B – D). Additional spines and tubes absent. Segment 7 with lateroventral acicular spines (Fig. 12 C, D). Additional spines and tubes absent. Segment 8 with middorsal and lateroventral acicular spines (Fig. 12 E, F). Lateral accessory tubes present (Fig. 12 F). Type- 1 glandular cell outlets present in paradorsal and ventromedial position (Fig. 12 F). Segment 9 with lateroventral acicular spines (Fig. 12 F). Paradorsal and ventrolateral sensory spots present (Fig. 12 E, F). Type- 1 glandular cell outlets present in paradorsal and ventromedial position. Segment 10 with laterodorsal tubes. Sensory spots present at least in ventrolateral position (Fig. 12 F). Two type- 1 glandular cell outlets aligned middorsally (Fig. 12 E). Additional pair of type- 1 glandular cell outlets present in ventromedial position. Segment 11 with lateral terminal spines (Fig. 12 A). Lateral terminal accessory spine present in observed female specimen (Fig. 12 A). Two type- 1 glandular cell outlet present middorsally (Fig. 12 E).