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Spirotrichea: Hypotrichia: Euplotida: Aspidiscidae

 Aspidisca cicada
(Müller, 1786) Claparède and Lachmann, 1858
Synonyms: A. costata (Dujadin, 1841), Stein, 1859; A. sulcata Kahl, 1930-5.
Aspidisca cicada Genus: Ovoid, firm; dorsal side convex, ventral side flattened; dorsal surface ridged; adoral zone reduced or rudimentary; macronucleus U-shaped or in two rounded parts (Kudo, 1966). No mariginal or caudal cirri; common genus (Carey, 1992).
Species: Ovoid, small and convex on the right; up to 45 μm long, body outline smooth; peristome at posterior expanded to form a swelling; dorsal ridges vary in shape and number; 7 ventral, 5 transverse cirri; macronucleus C-shaped (Carey, 1992).
Aspidisca cicada (Müller, 1786) Claparède and Lachmann, cell body 28 μm long, 23 μm wide, x 640, Tama river, Chofu city, Tokyo, Japan, February 24, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Aspidisca cicada Aspidisca cicada

A. costata (Dujardin, 1842 ?) Kahl, 1932 (synonym: A. cicada ?): Ovoid; 25-40 μm long, 17-28 μm wide; outline smooth but posterior swell; 6 longitudinal dorsal ridges; 7 frontoventral, 5 transverse cirri; macronucleus horseshoe-shaped; fresh water (Gensei-dobutu-zukan, 1981).

A. cicada (Müller, 1786) Claparède and Lachmann, 1858 (Syn. Aspidisca costata (Dujardin, 1841 ?) Stein, 1859; Aspidisca sulcata Kahl, 1930-5): Ovoid; 45 μm long; outline smooth but posterior swell; longitudinal dorsal ridges vary in shape and number; 7 frontoventral, 5 transverse cirri; macronucleus C-shaped (Carey, 1992).

A. polypoda (Dujardin, 1841) Kahl, 1930-5: Ovoid; 55 μm long; outline smooth but 7-8 dorsal ribs; 7 frontoventral, 6 transverse cirri; macronucleus horseshoe-shaped (Carey, 1992).

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