TRICHODINIDS AND OTHER PARASITIC PROTOZOA FROM THE INTERTIDAL ZONE AT NANAIMO, VANCOUVER ISLAND

Abstract

Haemogregarina bigemina Laveran and Mesnil (Sporozoa: Coccidia) is reported from the padded sculpin, Artedius fenestralis Jordan and Gilbert, and Eupoterion pernix MacLennan and Connell (Ciliata: Holotricha) and Scyphidia ubiquita Hirshfield (Ciliata: Peritricha) from the limpet, Acmaea cassis Eschscholtz. These are new host and locality records. Two trichodinids (Ciliata: Peritricha) are described from A. fenestralis. Trichodina vancouverense n. sp. has 16 to 25 (av., 22) denticles with blades averaging 3.0 μ in height, the striated membrane extending for about the same distance beyond them. The diameter of the denticulate ring at the outer limits of the denticles corresponds with the inner diameter of the macronucleus. T. decipiens n. sp. has 23 to 34 (av., 28) denticles, the blades of which average 6.5 μ in height and almost reach the levels of the outer edges of the striated membrane and macronucleus.