Zosterodasys hisioensis ( 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 : 47

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

( Figs 9 A, B)

Chilodontopsis hisioensis Ozaki & Yagiu, 1941: 171 , Pl. II fig. 4. Zosterodasys hisioensis – Jankowski 2007: 729 (combining author). Zosterodasys texensis Alekperov et al., 2007 /8: 111, fig. 6B.

Diagnosis. Size about 150–230 × 55–75 µm in vivo. Body shape obovate to elliptical with left margin anteriorly slightly projecting. Macronucleus ellipsoidal with a single globular micronucleus. One large posterior contractile vacuole accompanied by 4–5 small ones. About 80 ciliary rows: 45–47 ventral and 30–36 dorsal. Synhymenium incompletely encircles cell. On average 19 (16–22) nematodesmal rods. Marine.

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

Type material. Deposition of type material not mentioned by Ozaki & Yagiu (1941). Alekperov et al. (2007/8) deposited one holotype and two paratype slides with protargol impregnated specimens of Z. texensis in the Institute of Zoology, NAS of Azerbaijan, Baku City.

Etymology. Not given in the original description. We do not know the derivation of “ hisioensis ” but suppose that it is a Latinized Japanese place name.

Remarks. We suggest to synonymize Z. texensis with Z. hisioensis because diagnostic features of these two species are similar or overlap considerably. This concerns the body shape and size (150–200 × 70–75 µm in Z. hisioensis and 180–230 × 55–65 µm in Z. texensis ), the nuclear and contractile vacuole apparatus as well as the number of the nematodesmal rods (16 in Z. hisioensis and 18–22 in Z. texensis ). The number of the ciliary rows was not studied in Z. hisioensis by Ozaki & Yagiu (1941). Alekperov et al. (2007/8) discovered Z. texensis on aquatic plants in shallow bays of the Mexican Gulf.

Figures

FIGURE 9. Va ri ou s Zosterodasys species and their supposed synonyms from life (E), after Heidenhain’s haematoxylin stain (A), after silver carbonate (C, D, F – H) and protargol (B) impregnation. (A) Zosterodasys hisioensis, ventral view of a representative specimen. Length 200 µm. From Ozaki & Yagiu (1941). (B) Zosterodasys texensis, total ventral view of ciliary pattern and nuclear apparatus. From Alekperov et al. (2007 / 8). Reprinted by permission from “ Protistology ”, 2007 / 2008, 5 (2 / 3): 101 – 130. (C, D, H) Zosterodasys serrani, frontal view of oral opening (C) and ventral (D) as well as dorsal (H) view of ciliary pattern and nuclear apparatus. Arrowheads denote synhymenium which is restricted to the ventral body side (D). Length not provided. From Fernandez-Leborans (1990). (E – G) Zosterodasys henarensis, ventral view of a representative specimen (E) and schematized ventral (G) as well as dorsal (F) view of ciliary pattern and nuclear apparatus. Arrowheads denote proximal and distal end of synhymenium that almost completely encircles the body. Length not provided. From Sola et al. (1990).