Ancistrum haliotis, Xu & Song & Warren, 2015

Xu, Kuidong, Song, Weibo & Warren, Alan, 2015, Two New and Two Poorly Known Species of Ancistrum (Ciliophora, Scuticociliatia, Thigmotrichida) Parasitizing Marine Molluscs from Chinese Coastal Waters of the Yellow Sea, Acta Protozoologica 54 (3), pp. 195-208 : 196

Ancistrum haliotis n. sp. ( Figs 1–5 ; Table 1)

Nomenclature: Ancistrum haliotis Xu, Song and Warren, 2003 in Song et al. (2003, p. 129) is invalid because it was not indicated as a new species (see Article 16.1 of the ICZN 1999).

Diagnosis: Size about 70 × 25 µm in vivo; body more or less quadrilateral with anterior end narrower than posterior end. One ellipsoidal macronucleus and one micronucleus. On average 30 somatic kineties, with several ventral-left kineties distinctly curved near posterior end of cell, right kineties distinctly shortened in posterior region of cell forming a distinct glabrous area. Buccal area extending to posterior pole and occupying on average 88% of body length. Three membranelles each composed of two rows of kinetosomes: membranelles 1 and 3 short; membranelle 2 occupying about 70% of body length.

Figures

Figs 1−13. Ancistrum haliotis n. sp. from the abalone Haliotis discus hannai Ino (1–5), Ancistrum mytili (Quennerstedt, 1867) from the blue mussel Mytilus edulis (6, after Kidder 1933) and the horse mussel Modiolus modiolus (7, after Hatzidimitriou and Berger 1977) and Ancistrum crassum Fenchel, 1965 from the purple clam Saxidomus purpuratus (Sowerby) (8–11) and from the short-necked clam Ruditapes philippinarum (12, 13, after Xu et al. 1997), from life (1, 2, 6, 8) and after protargol (3–5, 9, 10, 12, 13) and silver nitrate impregnation (7, 11). 1 – left lateral view of a representative specimen; 2, 3 – ventral view to show the oral structure; 4, 5 – left and right lateral view of the holotype specimen; 6, 7 – lateral and ventral view of A. mytili, which possesses a characteristic reniform macronucleus and a broad buccal field; 8 – left lateral view of body variants; 9–13 – lateral and ventral view of three specimens to show the ciliary pattern. CCo – caudal complex; CyP – cytoproct; M1–3 – membranelles 1–3; MA – macronucleus; MI – micronucleus; PM – paroral membrane; Sc – scutica; SK1, n – somatic kineties 1, n. Scale bars: 30 µm (4, 5 and 7, 9–13 drawn to scale).