Zosterodasys acutus ( Ozaki & Yagiu, 1941 ) Jankowski, 2007

Vďačný, Peter & Tirjaková, Eva, 2012, Taxonomic revision of the ciliate genus Zosterodasys Deroux, 1978 (Protista: Ciliophora: Synhymeniida), Zootaxa 3345, pp. 34-58 : 53

Zosterodasys acutus ( Ozaki & Yagiu, 1941) Jankowski, 2007

( Fig. 7 H)

Chilodontopsis acuta Ozaki & Yagiu, 1941: 175 , fig. 23.

Zosterodasys acuta – Jankowski 2007: 729 (combining author).

Diagnosis. Size about 80–130 × 35–50 µm in vivo (?). Body shape narrowly obovate with left margin anteriorly slightly projecting. Macronucleus ellipsoidal with a single globular micronucleus. Three contractile vacuoles arranged in a row near right margin in posterior body half. About 22 ciliary rows on ventral side of cell. About 16 nematodesmal rods. Marine.

Type locality. Under cyanobacterial layer in saltwater ditches near the Onomiti Channel, Japan.

Type material. Deposition of type material not mentioned in the original paper.

Etymology. Not given in the original description. The Latin adjective acut · us, - a, - um ([m, f, n]; acute), obviously refers to the acute posterior body end.

Remarks. Jankowski (2007) combined C. acuta with Zosterodasys , but did not change the species groupname to masculine gender. Thus, according to the Articles 30.2.4, 31.2 and 34.2 of the ICZN (1999), we mandatorily change acuta to acutus because Zosterodasys is masculine gender. Full redescription and neotypification of Z. acutus is recommended because several important data (i.e., somatic and oral ciliary pattern as well as morphometry) and type material are lacking.

Figures

FIGURE 7. Vari o us Zosterodasys species and their supposed synonyms from life (A – C), after Heidenhain’s haematoxylin stain (H), and after protargol impregnation (D – G). (A – D, F, G) Zosterodasys kryophilus, ventral view of a representative specimen (A), lateral view showing dorsoventral flattening of the body (B), ventral view showing cortical granulation and contractile vacuole pattern (C), surface view of cortex showing a fibre bundle extending in parallel and right of the somatic kineties (D), ventral (F) and dorsal (G) view of ciliary pattern and nuclear apparatus. From Petz et al. (1995). (E) Zosterodasys sp., ventrolateral view of ciliary pattern and nuclear apparatus. This species is very likely a misidentified Orthodonella apohamatus, as indicated by the comparatively long preoral area, which can be a rostrum. From Agatha et al. (1993). (H) Zosterodasys acutus, ventral view of a representative specimen showing three contractile vacuoles (arrowheads) arranged in a row near right margin in posterior body half, a unique pattern as yet not found in any other Zosterodasys species. From Ozaki & Yagiu (1941). CV – contractile vacuoles, G – cortical granules.