Species [var. pseudopyramidatum]: Cell body medium in size, 42-61 μm long, 25-41 μm wide, L/W=1.8, isthmus 12.5-14 μm wide; semicells pyramidal or semielliptical in shape with flattened apex, basal corners rounded, lateral margins convex; a single chloroplast in each semicell.
[var. stenonotum Nordstedt f. minor Raciborski]: Cell body small, 28-42 μm long, 24-25 μm wide, isthmus 10-11 μm wide.
[var. carniolicum Lütkemüller]: Cell body 46-59 μm long, 29-34 μm wide, L/W=1.5, isthmus 12.6-14 μm wide; lateral margins concave (Illustrations of The Japanese Fresh-water Algae, 1977).

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var. pseudopyramidatum: Cell body 42-61 μm long, L/W=1.8
C. pseudopyramidatum 62 x 34 μm L/W= Miyatoko m.3 Minami-Aizu Fukushima, 2008	C. pseudopyramidatum 53 x 32 μm L/W=1.7 Omine-numa Minakami Gunma, 2007.4	C. pseudopyramidatum μm L/W= Omine-numa 4 Minakami Gunma, 2007.10	C. pseudopyramidatum 55 x 33 μm 53 x 29 μm Omine-numa Tsukiyono Gunma, 2003
C. pseudopyramidatum 51 x 29 μm L/W=1.8 Ushidome-ike Norikura highland Nagano, 2005	C. pseudopyramidatum 50 x 28 μm L/W=1.8 Ushidome-ike Norikura highland Nagano, 2006	C. pseudopyramidatum μm L/W= Mi-ike 3 Norikura highland Nagano, 2007
C. pseudopyramidatum μm L/W= Iroha-numa 5 Zao mountain Yamagata, 2008	C. pseudopyramidatum μm L/W= Iroha-numa 4 Zao mountain Yamagata, 2008	C. pseudopyramidatum 62 x 37 μm L/W=1.7 Kashibaru marsh Karatsu Saga, 2008
var. stenonotum f. minor: Cell body 28-42 μm long
C. pseudopyramidatum 49 x 27 μm Yahei-daira m.2 Azuma mt. Yamagata, 2007
var. carniolicum: Cell body 46-59 μm long, L/W=1.5
C. pseudopyramidatum v. carniolicum 57 x 34 μm Dojo-ike Norikura highland Nagano, 2006	C. pseudopyramidatum v. carniolicum 48 x 33 μm Kashibaru m.4 Karatsu Saga, 2008

Similar species -- >> C. pyramidatum (58-100 μm); C. microsphinctum (36-42 μm); C. granatum (23-47 μm);

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