Echinoderes sp.

Grzelak, Katarzyna & Sørensen, Martin V., 2022, Echinoderes (Kinorhyncha: Cyclorhagida) from the Hikurangi Margin, New Zealand, European Journal of Taxonomy 844, pp. 1-108 : 81-82

publication ID

https://doi.org/ 10.5852/ejt.2022.844.1949

publication LSID

lsid:zoobank.org:pub:193EDD91-B24D-455C-B8AA-8133586A00A1

DOI

https://doi.org/10.5281/zenodo.7225539

persistent identifier

https://treatment.plazi.org/id/03B48788-5B7C-2A41-FE5D-3E7C67C0FBB4

treatment provided by

Felipe

scientific name

Echinoderes sp.
status

 

Echinoderes sp. aff. E. galadrielae / E. beringiensis

Fig. 32 View Fig ; Table 20

Material examined

NEW ZEALAND • 1 ♀; Hikurangi Slope , stn TAN1004/4; 41.6837° S, 175.6642° E; 1046 m b.s.l.; Apr. 2010; NIWA TAN1004 Voyage; soft sediment; NIWA-159427 . Mounted for LM in Fluoromount G on glass slide GoogleMaps 2 ♂♂; Hikurangi Slope , stn TAN1004/38; 41.5937° S, 175.8532° E; 1121 m b.s.l.; Apr. 2010; NIWA TAN1004 Voyage; soft sediment; personal reference collection of MVS. Mounted for SEM GoogleMaps 1 ♀; Hikurangi Slope , stn TAN1004/76; 41.6833° S, 175.6500° E; 1282 m b.s.l.; Apr. 2010; NIWA TAN1004 Voyage; soft sediment; NHMD-921503 . Mounted for LM in Fluoromount G on HS slide GoogleMaps 1 ♂; same collection data as for preceding; personal reference collection of MVS. Mounted for SEM GoogleMaps 1 ♀, 1 ♂; Pahaua Canyon , stn TAN1004/12; 41.5508° S, 175.7250° E; 1350 m b.s.l.; Apr. 2010; NIWA TAN1004 Voyage; soft sediment; NHMD-921498 to 921499. Mounted for LM in Fluoromount G on glass slides GoogleMaps 2 ♂♂; Pahaua Canyon , stn TAN1004/27; 41.4983° S, 175.7043° E; 1013 m b.s.l.; Apr. 2010; NIWA TAN1004 Voyage; soft sediment; personal reference collection of MVS. Mounted for SEM GoogleMaps 1 ♂; Honeycomb Canyon , stn TAN1004/53; 41.4563° S, 175.8970° E; 948 m b.s.l.; Apr. 2010; NIWA TAN1004 Voyage; soft sediment; NHMD-921500 . Mounted for LM in Fluoromount G on glass slide GoogleMaps 1 ♂; Honeycomb Canyon , stn TAN1004/58; 41.4080° S, 175.8977° E; 1171 m b.s.l.; Apr. 2010; NIWA TAN1004 Voyage; soft sediment; NHMD-921502 . Mounted for LM in Fluoromount G on HS slide GoogleMaps 1 ♀; Seamount 310, stn TAN1004/69; 41.3353° S, 176.1882° E; 670 m b.s.l.; Apr. 2010; NIWA TAN1004 Voyage; soft sediment; NHMD-921501 . Mounted for LM in Fluoromount G on glass slide GoogleMaps .

Distribution

Hikurangi Margin, from slope, through canyon, and seamount habitats, 670–1350 m b.s.l. See Fig. 1 View Fig for a geographic overview of stations and Table 1 View Table 1 for station and specimen information.

Brief description and remarks

The examined specimens closely follow the morphology of E. galadrielae sp. nov. in terms of distribution of spines, tubes, glandular cell outlets, and even the middorsal division of the tergal plate of segment 11. However, E. galadrielae and E. aff. E. galadrielae / E. beringiensis differ at two important points, i.e., spine morphometrics (see Table 20) and the shape of the tergal extensions (compare Figs 30A View Fig , 31D, I View Fig with Fig. 32 View Fig ). Middorsal spines were in general longer in this current set of specimens, while the lateroventral ones were shorter than in E. galadrielae . The unidentified specimens have also markedly longer lateral terminal spines, which in most cases exceed the trunk length, resulting in markedly higher LTS/TL ratio in this species compared to E. galadrielae (average LTS/TL: 106% vs 87%, respectively). The most conspicuous difference between E. galadrielae and these unidentified specimens is expressed in the tergal extensions, which are exceptionally long in E. galadrielae ( Figs 29–31 View Fig View Fig View Fig ). This stands in strong contrast to the short, triangular tergal extensions in the unidentified specimens ( Fig. 32 View Fig ). These tergal extensions are much more similar to those in E. beringiensis as well as many other species of Echinoderes .

We would, on the other hand, hesitate in identifying the specimens as E. beringiensis , since they differ in the distribution of sensory spots and lack the midlateral glandular cell outlets type 2 that characterizes females of E. beringiensis (see Adrianov & Maiorova 2022). In addition, E. beringiensis has a longer trunk (TL: 331 µm vs 208 µm, respectively) and has proportionally shorter lateral terminal spines (LTS/TL: 50% vs 106%, respectively). In conclusion, these enigmatic specimens appear to represent an intermediate between E. galadrielae sp. nov. and E. beringiensis , and it would require a molecular comparison to unveil their true identity.

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