Angursa antarctica Víllora-Moreno, 1998

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 : 19

Angursa antarctica Víllora-Moreno, 1998

N= 62 specimens occurrence: ANDEEP I; 2,893 m bsl.

Fig. 9A–B ; Supplementary Table 1.7

Short description

Small Angursa with slender body (106–150 µm long, 19–22 µm width, n=5) and primary clavae shorter than cirri A. Individuals with long cephalic cirri and cirri E. Secondary clavae are present ( Fig. 9A, A 2 ). Short hemispherical sensory organs on legs IV present ( Fig. 9A ). Males have gonopore as in the original description ( Fig. 9B ).

Remarks

A. antarctica belongs to the A. lanceolata group with primary clavae shorter than cirri A ( Fujimoto & Hansen 2019). This species is recognisable by hemispherical leg IV sensory organs. Annulated scapi of cirri E sometimes not clearly visible ( Víllora-Moreno, 1998).

Figures

FIGURE 2. Absolute abundances of Tardigrada from all 130 analysed core samples of expeditions ANDEEP-1 to 3 and ANDEEP-SYSTCO to the Southern Ocean plotted against depth. Samples were taken at different working areas in the Cape Basin, in the Lazarev Sea, in the Weddell Sea, in the Ona Basin, and at different working stations in the Drake Passage

FIGURE 9. Angursa lanceolata group. A Angursa antarctica, male, light microscopy (DIC), dorsal view. A2 Angursa antarctica, male, light microscopy (DIC), dorsal view, secondary clavae indicated. B Angursa antarctica, male, light microscopy (DIC), ventral view, note male gonopore (arrowhead). C Angursa lanceolata, female, light microscopy (DIC), ventral view. D Angursa lingua, female, light microscopy (DIC), dorsal view. E Angursa lingua, light microscopy (DIC), sagittal view, note cE (arrowhead). Abbreviations: cA—cirrus A, cE—cirrus E, pb—pharyngeal bulb, pc—primary clava, sc—secondary clava, se—leg sensory organ, tc—tertiary clava.