Taxonomic Studies on Three Marine Pleurostomatid Ciliates: Kentrophyllum verrucosum (Stokes, 1893) Petz, Song et Wilbert, 1995, Epiphyllum soliforme (Fauré-Frémiet, 1908) gen. n., comb. n. and Amphileptus sikorai sp. n., with the Establishment of a New Genus Epiphyllum (Ciliophora: Pleurostomatida)
Xiao-Feng Lin；Wei-Bo Song；Alan Warren
Amphileptus sikorai sp. n. ； Epiphyllum gen. n. ； Kentrophyllum ； marine ciliates ； morphology and infraciliature
|Volume or Term/Year and Month of Publication||
44卷2期（2005 / 06 / 01）
129 - 145
The morphology of living cells and infraciliature of three marine pleurostomatid ciliates, Kentrophyllum verrucosum (Stokes, 1893) Petz, Song et Wilbert, 1995, Epiphyllum soliforme (Fauré-Frémiet, 1908) gen. n., comb. n. and Amphileptus sikorai sp. n., collected from mariculture ponds near Qingdao (Tsingtao), China, have been investigated. Based on the present work and on previous data, an improved diagnosis for the genus Kentrophyllum Petz, Song et Wilbert, 1995 is suggested: leaf-shaped Amphileptidae without conspicuous neck-like region and having numerous somatic kineties on both cell sides; spines along ventral and dorsal margins; somatic ciliature on the right side forming sutures; one peripheral kinety consisting of dikinetids and forming a complete circle surrounding cell margin on right side. The new genus Epiphyllum is diagnosed by the following combination of characters, which separates it from other pleurostomatids: (1) sutures present on both right and left sides; (2) peripheral kinety present; (3) numerous somatic kineties on both sides of cell; (4) cell without typical necklike portion, hence generally oval or leaf-like in body outline, although it also exhibits high levels of metaboly; (5) presence of peribuccal papillae along left side of oral slit; (6) spines absent. Redefined diagnoses for K. verrucosum and E. soliforme are also supplied. As a new species, Amphileptus sikorai can be distinguished by: medium-sized marine Amphileptus about 90-200 × 20-60 μm in vivo, leaf-shaped body with a conspicuous hyaline fringe, no neck-like region; 14-17 left and 13-18 right somatic kineties; three perioral kineties bending to dorsal side at anterior end; two macronuclear nodules; two or three contractile vacuoles positioned dorsally in mid-body; bar-shaped extrusomes densely arranged in hyaline fringe along cell margin. Based on the data available, a new key to some closely related genera of pleurostomatids is suggested.