Pseudocohnilembus hargisi Evans & Thompson, 1964

Xuming Pan, 2016, Seven scuticociliates (Protozoa, Ciliophora) from Alabama, USA, with descriptions of two parasitic species isolated from a freshwater mussel Potamilus purpuratus, European Journal of Taxonomy 249, pp. 1-19 : 6

Pseudocohnilembus hargisi Evans & Thompson, 1964

Fig. 3A–D ; Table 1

Description

Description based on Alabama population: Size in vivo 20–30 × 8–12 μm, elongate-elliptical in outline, with cell width becoming wider toward posterior end ( Fig. 3A–C ). Cytoplasm colourless to grayish, containing several to many shining granules ( Fig. 3A–B ). Extrusomes not observed. One caudal cilium 10 μm long or approximately 30% of body length. Single macronucleus. Somatic cilia approximately 5 μm long. Twelve to 13 somatic kineties. M1 and 2 parallel to the cell’s longitudinal axis, each formed by a single row of kinetosomes ( Fig. 3D ). M2 started anteriorly near the second paired kinetids of somatic kinety 1, terminated posteriorly near the mid-body region ( Fig. 3D ). Length of M2 80% of buccal field; M3 consisting of three rows of kinetids.

Figures

Fig. 3. A – D. Pseudocohnilembus hargisi Evans & Thompson, 1964. E – J. Parauronema cf. longum Song, 1995. A – C, E – I. In vivo. D, J. After silver impregnation. A, E. Ventral views of typical individuals, arrow in (A) shows caudal cilia. B – C, F – G. Different individuals, showing varying body shapes, arrowheads in (F) mark somatic kineties. D, J. Detailed structure of the buccal area. H. Ventral view, arrow refers to dumbbell-shaped crystals. I. Posterior end, arrow marks caudal cilium. Abbreviations: M 1, 2, 3 = membranelle 1, 2 and 3; PM = paroral membrane; Sc = scutica. Scale bars: A – B = 15 μm; C, E = 40 μm; G = 60 μm.