Seven scuticociliates (Protozoa, Ciliophora) from Alabama, USA, with descriptions of two parasitic species isolated from a freshwater mussel Potamilus purpuratus Author Xuming Pan text European Journal of Taxonomy 2016 249 1 19 journal article 37563 10.5852/ejt.2016.249 09521c67-41e4-40da-9d43-97412eb789e9 118-9773 200009 urn:lsid:zoobank.org:pub:43278833-B695-4375-B1BD-E98C28A9E50E Uronema marinum Dujardin, 1841 Fig. 4 F–I; Table 1 Description Description based on Alabama population: Size in vivo 10–25 × 6–10 μm, elongate-elliptical in outline ( Fig. 4 F). Anterior end flat, with an apical plate, dorsal posterior area slightly rounded ( Fig. 4 F–H). Buccal field 50% of body length. Pellicle smooth ( Fig. 4 F–I). Extrusomes approximately 1 µm long, rodshaped, closely beneath pellicle. One large globular to ellipsoidal macronucleus centrally located with numerous tiny (approximately 1×1 μm) irregularly-shaped peripheral nucleoli ( Fig. 4 F–I). Contractile vacuole about 3 μm in diameter at posterior end of cell ( Fig. 4 H). Movement unremarkable, either swimming continuously or resting on the bottom. Twelve to 13 ciliary rows. Buccal apparatus typical of genus: M1 positioned near apical plate and composed of 5–7 kinetosomes; M2 slightly longer than M1; M3 very short ( Fig. 4 I). PM on right of shallow buccal cavity, composed zigzaging row of basal bodies, extending anteriorly to middle of M2 ( Fig. 3 I).