Genus: Test circular, ovoid or discoid; pseudostome eccentric, circular or ovoidal; with or without spines (Kudo, 1966).
Species: Test variable in shape and size; diameter 100-150 μm; pseudostome 50-60 μm; with 4-6 spines (?); opaque or semitransparent; with fine sand-grains or diatom shells (Kudo, 1966). 138-200 μm in diameter, 48-60 height; several spines; pseudostome 30-60 μm, recurved, invaginated (Illustrated Guide, 1985).

Google Image Search

C. aculeata or C. discoides ? 170 x 140 μm Univ. A.V.M. Obihiro Hokkaido, 2005	C. aculeata 150 x 140 μm 4 spines Japan, 199?	C. aculeata 150 x 150 μm Onnenai Kushiro marsh Hokkaido, 2005	C. aculeata 155 x 133 μm 148 x 132 μm 4 spines Japan, 199?
C. aculeata 155 x 150 μm 4 spines near Karakemi m. Omachi Nagano, 2005	C. aculeata 155 x 153 μm 6 spines Saitama, 1999	C. aculeata 153 x 155 μm 140 x 140 μm 5 spines Uruguay, 1999	C. aculeata 155 x 137 μm 4 spines Kannon-numa Shimogo Fukushima, 2005
C. aculeata 145 x 135 μm 4 spines Japan, 199?	C. aculeata μm 4 spines Japan, 199?	C. aculeata 153 x 153 μm Omine-numa Tsukiyono Gunma, 2003	C. aculeata 150 x 145 μm 2 spines Kawatabi Narugo Miyagi, 2003
C. aculeata 150 x 170 μm spines Ichinose-enchi Norikura highland Nagano, 2005	C. aculeata 143 x 150 μm 8 spines Saitama, 1999	C. aculeata 140 x 143 μm 10 spines Saitama, 1999	C. aculeata 130 x 135 μm 9 spines Yamagata, 1999
C. aculeata 140 x 145 μm φ 12 spines Fukushima, 1999	C. aculeata 140 μm spines Kamonoyachi-numa Zao onsen Yamagata, 2005	C. aculeata ? multinucleate 140 x 120 μm 5 spines Univ. A.V.M. Obihiro Hokkaido, 2005	C. aculeata 125 μm Yokotashiro Katashina Gunma, 2007
C. aculeata ? multinucleate 80 x 85 μm Omine-numa Tsukiyono Gunma, 2003	C. aculeata 100 x 90 μm Omine-numa Tsukiyono Gunma, 2006	C. aculeata ? 130 x 110 μm Furuike marsh Togakushi highland Nagano, 2005	C. aculeata ? 125,135 x μm Nidanuma Tsuchiyu-onsen Fukushima, 2005
C. aculeata ? 90 x μm Mida-ga-hara 5 Gassan Yamagata, 2006	C. aculeata 122 x 110 μm 4 spines near Yamaguchi Univ. Yamaguchi, 2004	C. aculeata 125 x 105 μm 4 spines Yoshigadaira m. Shirane mountain Gunma, 2005
C. aculeata 115 x 95 μm 4 spines Numa-no-hara m. Madarao highland Niigata, 2005	C. aculeata 110 x 107 μm Onnenai Kushiro marsh Hokkaido, 2005	C. aculeata 107 x 90 μm Kisuge konuma Shimogo Fukushima, 2005	C. aculeata 105 x 100 μm 6 spines near Imori pond Myoko highland Niigata, 2004
C. aculeata small var. or ? 85-90 x μm Japan, 199?	C. aculeata small var. or ? 65 x 60 μm Japan, 1998	C. aculeata small var. or ? 63 x 63 μm 68 x 55 μm Japan, 199?	C. aculeata small var. or ? 60 x 53 μm 71 x 60 μm Uruguay, 1999
C. aculeata small var. or ? 60 x 55 μm Iono michi-no-eki Nasu Tochigi, 2004	C. aculeata small var. or ? 70 x 55 μm Ichinose-enchi Norikura highland Nagano, 2005	C. aculeata μm Kuroiso Tochigi, 1998	C. aculeata small var. or ? 46 x 48 μm Japan, 199?

Please click on species name for more images.

Copyright Protist Information Server