Abstract
Trichodina labrisomi n.sp. from the gills of the hairy blenny, Labrisomas nuchipinnis (Quoy and Gaimard), in Mangrove Lake, Bermuda, is described using light microscopy and scanning electron microscopy (SEM). Light microscopy reveals that the dimensions and morphology of T. labrisomi are similar to those given for only 13 previously described species of Trichodina (T. acuta Lom, 1961; T. baicalensis Dogiel, 1957; T. cottomephori Stein, 1979; T. dalli Zhukov, 1964; Trichodina domerguei domerguei Lom and Shtein 1966; T. elegans Stein, 1979; T. fultoni Davis, 1947; T. jadranica Haider, 1964; T. jadranica noblei Lom, 1970; T. partidisci Haider, 1964; T. reticulata Hirschmann et Partsch, 1955; T. tenuidens Faure-Fremiet, 1943; and T. tenuiformis Stein, 1979). However, compared with these similar forms, T. labrisomi n.sp. is distinguished by the dimensions of its body and denticulate ring and (or) the appearance of its silver-impregnated adhesive disc and denticles. Features of T. labrisomi examined by SEM include the body shape, pellicle, aboral pellicular pores, border membrane, aboral ciliary complex, and adoral ciliature, which are described and compared with those of other trichodinids studied using SEM. SEM also revealed that bacilli were distributed circumequatorially over the oral surface of T. labrisomi.
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