Echiniscus trisetosus Cuénot, 1932

Gąsiorek, Piotr & Vončina, Katarzyna, 2023, Atlas of the Echiniscidae (Heterotardigrada) of the World-part I: West Palaearctic Echiniscus species, Zootaxa 5344 (1), pp. 1-72 : 56-58

20. Echiniscus trisetosus Cuénot, 1932

Figure 4B

Synonyms

Echiniscus osellai Maucci, 1974 syn. nov.

Echiniscus storkani Bartoš, 1940 : Gąsiorek et al. (2019b)

Terra typica : France.

Etymology: From Latin tres = three + saetōsus = bristly, referring to the presence of three trunk cirri (C, Cd, D) on each side of the body. An adjective in nominative singular.

Shortened description. Medium-sized to large (ca. 250–380 μm, typically 300–350 μm). Body appendage configuration A-C-Cd- D-Dd ( Fig. 4B ), all but Dd cirrous, and Dd –spiniform. See E. blumi above for the remaining characters.

Phylogenetic position: Echiniscus trisetosus is firmly located at the base of the Echiniscus phylogenetic tree (Figs 1–2).

Remarks: Echiniscus osellai Maucci, 1974 syn. nov. has an identical chaetotaxy and sculpturing ( Figs 5G–I ) as E. trisetosus , and there are no discriminative criteria between these two species. Besides, as above for E. blumi .

Figures

FIGURE 4. Echiniscus blumi-canadensis complex of species (PCM): A—E. blumi in dorsolateral view (insert shows claws III), B—E. trisetosus in dorsal view, C—E. canadensis in lateral view. Scale bars in μm.

FIGURE 5. Dorsal plate sculpturing of the blumi-canadensis complex (PCM): A—scapular plate of E. trisetosus, B—scapular plate of E. trojanus syn. nov. (paratype, upper magnification), C—scapular plate of E. trojanus syn. nov. (paratype, lower magnification), D—median plate 1 of E. trojanus syn. nov. (paratype), E—paired segmental plate I of E. trojanus syn. nov. (paratype), F—caudal (terminal) plate of E. trojanus syn. nov. (paratype), G—scapular plate of E. osellai syn. nov. (paratype), H—paired segmental plate I of E. osellai syn. nov. (paratype), I—caudal plate of E. osellai syn. nov. (paratype). Scale bars = 10 μm.