Trichodina nandusi Mitra 2013

Göçmen, Bayram, 2017, First record of ectoparasitic ciliates, of genus Trichodina (Ciliophora: Trichodinidae) parasiting cultured Oranda Gold Fish (Carassius auratus auratus L.) in India, Zootaxa 4319 (1), pp. 128-142 : 138-139

Trichodina nandusi Mitra 2013

( Fig 3E , 4E ; Table 5)

Description. (n=15) A medium to small sized trichodinid having a body diameter of 40.5–52.3 µm (46.4±8.3). The adhesive disc is 33.0–45.0 µm (39.0±8.4) in diameter, surrounded by a wide border membrane of 4.5–6.5 µm (5.5±1.4). The central area is 4.4–12.5 µm (8.45±5.7) in diameter, which is surrounded by a denticulate ring, having a diameter of 22.6–29.0 µm (25.8±4.5) consisting of 20–24 (22±2.8) numbers of denticles. Tips of the rays are evenly touches with a margin of central area. The blades are elongated, having a length of about 4.6–7.5 (6.05±2.0) and 10.5–13.0 (11.75±1.7) in width which become softly curved with a viewable thickening of the posterior border. Anterior border is angular which forming a conical apex that extends almost all areas towards the y+1 axis (Figure 7a and Figure 7b). The central part usually triangular in shape. The tip of central part extends an almost half portion towards y-1 axis. The denticle rays are usually longer in comparison to the blades measuring about 4.5–7.5 µm (6.0±2.1) in length. Ray is tapered to a rounded tip with a central part having a diameter of 1.5– 2.3 µm (1.9±0.5).

Taxonomic summary

Host: Carassius auratus auratus (L.)

Locality: Hoogly, West Bengal, India (230 01'20''N– 220 39'32''N / 880 30'15''E–870 39'32'' E)

Location: Gills

Reference material: Lectotype: In slide no. GF-TND-10/2014, deposited in the collection of the Parasitology Laboratory , Department of Zoology , University of Kalyani , Kalyani, Nadia, West Bengal, India

Remarks. On analyzing the photomicrographs of specimens, and morphometric and meristic data from all the populations are illustrated the specimen was readily identified as Trichodina nandusi Mitra et al (2013) . T. nandusi was firstly reported from the gill of N. nandus of in the freshwater fishes of the river Rupnarayan in the Howrah district of West Bengal, India by Mitra et al. (2013) but in this study, this species recorded for the first time as a pathogen of Carassius auratus auratus (L.) in India. Trichodina nandusi obtained in the present study is morphometrically compared with an earlier one ( Table 5).

Figures

FIGURE 3. A – F Photomicrographs of silver nitrate impregnated adhesive discs of Trichodinid species. (A) Trichodina reticulata Hirschman & Partesh 1955 (B) Trichodina mutabilis Kazubski & Migala 1968 (C) Trichodina acuta Lom 1961 (D) Trichodina ngoma Van & Basson 1992 (E) Trichodina nandusi Mitra et al. 2013 (F) Trichodina domergui Wallengren 1897 identified from Carassius auratus auratus (L.). Scale Bar – 20 µm.

FIGURE 4. A – F Diagrammatic drawings of the denticles of Trichodinid species i. e. (A) Trichodina reticulata Hirschman and Partesh 1955 (B) Trichodina mutabilis Kazubski & Migala 1968 (C) Trichodina acuta Lom 1961 (D) Trichodina ngoma Van & Basson 1992 (E) Trichodina nandusi Mitra et al. 2013 (F) Trichodina domergui Wallengren 1897 obtain in the present study.