Styraconyx takeshii Fujimoto, Suzuki, Ito, Tamura & Tsujimoto, 2020

Trokhymchuk, Roman, Schmidt-Rhaesa, Andreas, Utevsky, Serge, Kristensen, Reinhardt Møbjerg & Kieneke, Alexander, 2024, Towards a better understanding of deep-sea tardigrade biogeography: numerous new records from the Southern Ocean, Zootaxa 5543 (1), pp. 1-39 : 21

Styraconyx takeshii Fujimoto, Suzuki, Ito, Tamura & Tsujimoto, 2020

N= 1 specimen: female occurrence: ANDEEP II; 1,109 m bsl.

Figs 10F–I ; Supplementary Table 1.11

Short description

Adult female (145 µm long, n=1) with the typical character combination of this species. Dorsal cuticle undulated ( Fig. 10F ). Primary clavae elongated ( Fig. 10F ). Large secondary clavae are present ( Fig. 10G ). Head cirri are divided into three regions ( Fig. 10G ). Thick seminal receptacle duct openings with no terminal swelling as lateral projections ( Fig. 10H ). Digits with proximal pads and small peduncles ( Fig. 10I ). Leg IV sensory organs as elongated papillae ( Fig. 10H ).

Remarks

Styraconyx takeshii is well recognisable by the shape of dorsal cuticle with transversal ridges, elongated form of primary clavae, small peduncles and robust seminal receptacle opening ( Fujimoto et al. 2020).

Figures

FIGURE 10. Genus Styraconyx. A Styraconyx qivitoq, male, light microscopy (DIC), dorsal view. B Styraconyx qivitoq, male, light microscopy (DIC), head, dorsal view, note secondary clava (arrowhead). C Styraconyx qivitoq, male, light microscopy (DIC), head, ventral view, note neck folds (arrowhead). D Styraconyx qivitoq, male, light microscopy (DIC), leg III, note digit covered with a cuticle hood (arrowhead). E Styraconyx qivitoq, male, light microscopy (DIC), caudal region, note male gonopore (arrowhead). F Styraconyx takeshii, female, light microscopy (DIC), sagittal view, note undulated dorsal cuticle (arrowhead). G Styraconyx takeshii, female, light microscopy (DIC), sagittal view. H Styraconyx takeshii, female, light microscopy (DIC), sagittal view. I Styraconyx takeshii, female, light microscopy (DIC), sagittal view. Abbreviations: cA—cirrus A, cE—cirrus E, ec—external cirrus, go—gonopore, ic—internal cirrus, mc—median cirrus, pc—primary clava, pe—peduncle, pp—proximal pad, se—leg sensory organ, sro—seminal receptacle opening.