Family: Scales round to elliptical, thin.
Genus: Test round or oval in cross-section; pseudostome terminal with dentate scales.
Species: Size, 55-88 μm long; 25-30 μm diam. Cross-section round, pseudostome round; 3- 8 spine-scales 20 to 35 μm long at base (Illustrated Guide, 1985).

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s. = scales

Spines long, few (3-4, arising from a narrow subapical zone)
Scales more than 10 μm long
E. acanthophora ? 108 x 44 μm Test; L/W=2.5 s. 9 x 7 μm Scale; L/W=1.3 rows Japan, 1998	E. acanthophora 93 x 47 μm Test; L/W=2.0 s. 10 x 9 μm Scale; L/W=1.1 rows Kannon-numa Shimogo Fukushima, 2005	E. acanthophora 85 x 37 μm Test; L/W=2.3 s. 11 x 8 μm Scale; L/W=1.4 rows Senjo-ga-hara Nikko Tochigi, 2003	E. acanthophora 80 x 41 μm Test; L/W=2.0 s. 11 x 9 μm Scale; L/W=1.2 rows Onnenai Kushiro marsh Hokkaido, 2005
E. acanthophora 72 x 41 μm Test; L/W=1.8 s. 10 x 9 μm Scale; L/W=1.1 Numa-no-hara m. Madarao highland Niigata, 2005	E. acanthophora 70 x 36 μm Test; L/W=1.9 s. 10? x 7 μm Scale; L/W=1.4 ? Nidanuma Tsuchiyu-onsen Fukushima, 2005	E. acanthophora 70 x 38 μm Test; L/W=1.8 s. 11 x 7 μm Scale; L/W=1.4 Kumakubo Nasu-shiobara Tochigi, 2005	E. acanthophora 73 x 37 μm Test; L/W=2.0 s. 9 x 7.5 μm Scale; L/W=1.2 Kannon-numa Shimogo Fukushima, 2005
Scales less than 10 μm long
E. acanthophora 78 x 37 μm Test; L/W=2.1 s. 8 x 8 μm Yukawa-numa Nishiwaga Iwate, 2007	E. acanthophora 71 x 33 μm Test; L/W=2.2 s. 8 x 7 μm Scale; L/W=1.1 rows Hiroshima, 1998	E. acanthophora 69-75 x 37 μm Test; L/W=1.8-2.0 s. 8 x 6 μm Scale; L/W=1.3 rows Japan, 1997	E. acanthophora 70 x 31 μm Test; L/W=2.3 s. 9 x 6 μm Scale; L/W=1.5 Onnenai Kushiro marsh Hokkaido, 2005
var. flexuosa ? 68 x 34 μm Test; L/W=2.0 s. 9 x 9 μm Scale; L/W=1.0 rows Hiroshima, 1998	var. flexuosa ? 65 x 33 μm Test; L/W=2.0 s. 7-9 μm φ Scale; L/W=1.0 Onnenai Kushiro marsh Hokkaido, 2005	var. flexuosa ? 65 x 33 μm Test; L/W=2.0 s. 9 x 6 μm Scale; L/W=2.0 Onnenai Kushiro marsh Hokkaido, 2005
E. acanthophora 65 x 32 μm Test; L/W=2.0 s. μm Scale; L/W= Kusatsu Onsen b.t. Kusatsu Gunma, 2005	E. acanthophora 62 x 30 μm Test; L/W=2.1 s. 9 x 7 μm Scale; L/W=1.3 Tane-ike Togakushi highland Nagano, 2005	E. acanthophora 55 x 30 μm Test; L/W=1.8 s. 5 x 5 μm Scale; L/W=1.0 rows Japan, 1998	E. acanthophora 65 x 25 μm Junichogata s.k. Himi Toyama, 2006
Spines long, many (5-6?, arising from wide subapical area)
E. acanthophora cell division Test; L/W= Scale; L/W= rows Japan, 199?	E. acanthophora 57 x 29 μm Test; L/W=2.0 s. μm Scale; L/W= rows Kitayama park Nishi-no-miya Hyogo, 2004	E. acanthophora 62-67 x 35 μm Test; L/W=1.8 s. μm Scale; L/W= rows Japan, 1997	E. acanthophora 50 x 28 μm Test; L/W=1.8 s. μm Scale; L/W= rows near Yamaguchi Univ. Yamaguchi, 2004
Spines short
var. brevispina ? 92 x 51 μm Test; L/W=1.8 s. μm Scale; L/W=1.4 Ichinose-enchi Norikura highland Nagano, 2005	var. brevispina ? 90 x 44 μm Test; L/W=2.0 s. μm Scale; L/W= Ichinose-enchi Dojo-ike Nagano, 2006	E. acanthophora 71 x 40 μm Test; L/W=1.8 s. 10 x 8 μm Scale; L/W=1.3 rows Uruguay, 1999	var. brevispina ? 72 x 38 μm Test; L/W=1.9 s. μm Scale; L/W= rows Japan, 1998
var. brevispina ? 56-63 x 30 μm Test; L/W=1.9-2 s. μm Scale; L/W= rows Japan, 1998	var. brevispina ? 74 x 40 μm Test; L/W=1.9 s. 9 x 8 μm Scale; L/W=1.1 rows Japan, 1998	var. brevispina ? 74 x 39 μm Test; L/W=1.9 s. 11 x 8 μm Scale; L/W=1.4 rows Imori pond Myoko highland Niigata, 2004	var. brevispina ? 74 x 39 μm Test; L/W=1.3 s. 10 x 8 μm Scale; L/W= rows Aizu Recreation p. Aizuwakamatsu Fukushima, 2005
Spines very short
E. acanthophora 77 x 36 μm Test; L/W=2.1 s. 9 x 6 μm Scale; L/W=1.5 rows Senjo-ga-hara Nikko Tochigi, 2003	E. acanthophora 72 x 40 μm Test; L/W=1.8 s. 7 x 5 μm Scale; L/W=1.4 rows Japan, 1998	E. acanthophora 66 x 34 μm Test; L/W=1.9 s. 6 x 6 μm Scale; L/W=1.0 rows Japan, 1998	E. acanthophora 65 x 37 μm Test; L/W=1.8 s. 9 x 8 μm Scale; L/W=1.1 rows Torimiyama p. Kagami-ishi Fukushima, 2003
E. tuberculata 60 x 39 μm Test; L/W=1.5 s. 10 x 9 μm Scale; L/W=1.2 ? rows Chaya-numa p. Fukushima Fukushima, 2005	E. acanthophora 56 x 33 μm Test; L/W=1.6 s. 9 x 7 μm Scale; L/W=1.3 rows Japan, 1998
large variety
E. acanthophora ? 85 x 60 μm Test; L/W=1.4 s. 11 μm φ Scale; L/W=1.0 rows Senjo-ga-hara Nikko Tochigi, 2003

Similar species -->> E. crenulata; E. gauthieri; E. hutchinsoni;

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