Echinoderes, Yamasaki & Neuhaus & George, 2018

Yamasaki, Hiroshi, Neuhaus, Birger & George, Kai Horst, 2018, 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, Zootaxa 4387 (3), pp. 541-566 : 561-564

publication ID

https://doi.org/ 10.11646/zootaxa.4387.3.8

publication LSID

lsid:zoobank.org:pub:DA75D56E-22BB-487E-8BA3-42C5C98F9E53

DOI

https://doi.org/10.5281/zenodo.5952909

persistent identifier

https://treatment.plazi.org/id/03CD87E0-2442-FFD4-3D86-2BF208FAFDD7

treatment provided by

Plazi

scientific name

Echinoderes
status

 

Echinoderes sp. 2

( Fig. 12 View FIGURE 12 ; Tables 8, 9)

Material examined. One adult female (ZMB 11595), collected at station 742 in the deep-sea plain near the Sedlo Seamount ( Fig. 1A, B View FIGURE1 ; Table 1), mounted as glycerol-paraffin slide on a Cobb aluminum frame.

Brief description. Adult with head, neck, and eleven trunk segments ( Fig. 12A View FIGURE 12 ). 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. 12B View FIGURE 12 ). Additional spines and tubes absent.

Segment 5 with middorsal acicular spine and lateroventral tubes ( Fig. 12B, C View FIGURE 12 ). Additional spines and tubes absent.

Segment 6 with middorsal and lateroventral acicular spines ( Fig. 12B–D View FIGURE 12 ). Additional spines and tubes absent.

Segment 7 with lateroventral acicular spines ( Fig. 12C, D View FIGURE 12 ). Additional spines and tubes absent.

Segment 8 with middorsal and lateroventral acicular spines ( Fig. 12E, F View FIGURE 12 ). Lateral accessory tubes present ( Fig. 12F View FIGURE 12 ). Type-1 glandular cell outlets present in paradorsal and ventromedial position ( Fig. 12F View FIGURE 12 ).

Segment 9 with lateroventral acicular spines ( Fig. 12F View FIGURE 12 ). Paradorsal and ventrolateral sensory spots present ( Fig. 12E, F View FIGURE 12 ). 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. 12F View FIGURE 12 ). Two type-1 glandular cell outlets aligned middorsally ( Fig. 12E View FIGURE 12 ). Additional pair of type-1 glandular cell outlets present in ventromedial position.

Segment 11 with lateral terminal spines ( Fig. 12A View FIGURE 12 ). Lateral terminal accessory spine present in observed female specimen ( Fig. 12A View FIGURE 12 ). Two type-1 glandular cell outlet present middorsally ( Fig. 12E View FIGURE 12 ).

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. 2016a).

Echinoderes sp. 2 can be easily distinguished from E. augustae , E. dujardinii , and E. gerardi by the spine lengths: Echinoderes sp. 2 has relatively long middorsal spines (e.g., 86 µm on segment 7 and 110 µm on segment 8) and long lateral terminal spines (224 µm), whereas E. augustae has short middorsal spines (e.g., 44–63 µm and 51–74 µm on segments 7 and 8, respectively) and very short lateral terminal spines (31–44 µm), and E. dujardinii and E. gerardi have very short middorsal acicular spines (e.g., 13–23 µm and 16–27 µm on segments 7 and 8, respectively in E. dujardinii ; and 10 µm and 12 µm on segments 7 and 8, respectively in E. gerardi ) and slightly shorter lateral terminal spines (160–192 µm in E. dujardinii and 172 µm in E. gerardi ) ( Higgins 1977, 1978; Sørensen & Landers 2014).

Echinoderes sp. 2 and E. muricatus reveal more or less a similar lengths of spines. But Echinoderes sp. 2 differs from E. muricatus at least in the presence of type-2 glandular cell outlets on segment 2 (Pardos et al. 2016a).

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.

Kingdom

Animalia

Phylum

Cephalorhyncha

Class

Kinorhyncha

Order

Cyclorhagida

Family

Echinoderidae

Loc

Echinoderes

Yamasaki, Hiroshi, Neuhaus, Birger & George, Kai Horst 2018
2018
Loc

Echinoderes

Yamasaki & Neuhaus & George 2018
2018
Loc

Echinoderes

Yamasaki & Neuhaus & George 2018
2018
Loc

Echinoderes

Yamasaki & Neuhaus & George 2018
2018
Loc

Echinoderes

Yamasaki & Neuhaus & George 2018
2018
Loc

E. augustae

Sorensen & Landers 2014
2014
Loc

E. augustae

Sorensen & Landers 2014
2014
Loc

E. gerardi

Higgins 1978
1978
Loc

E. gerardi

Higgins 1978
1978
Loc

E. gerardi

Higgins 1978
1978
Loc

E. gerardi

Higgins 1978
1978
Loc

E. dujardinii

Claparede 1863
1863
Loc

E. dujardinii

Claparede 1863
1863
Loc

E. dujardinii

Claparede 1863
1863
Loc

E. dujardinii

Claparede 1863
1863
GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF