Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections)
Species [var. ansatum ]: Cell body medium in size, elongate pyramid-shaped, side margins cocaved, 87-95 μm long, 39-42 μm wide, L/W=2, isthmus 11-14 μm wide; cell wall dotted, with 5 bulges conspicous (2 central, 3 basal) (Illustrations of The Japanese Fresh-water Algae, 1977).
[var. dideltiforme ]: Cell body 81-109 μm long, 42-53 μm wide, constriction 11-15 μm wide; semicells tapered to terminal lobe, anterior lateral lobes slightly developed
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| var. ansatum: Lateral margins slightly depressed; 87-95 μm long, 39-42 μm wide | |||
v. ansatum 88 x 44 μm L/W=2.0 Hiroshima, 1998 |
v. ansatum 100 x 41,44 μm L/W=2.4 Omine-numa Tsukiyono Gunma, 2003 |
v. ansatum μm L/W= Omine-numa Minakami Gunma, 2007  |
v. ansatum μm Kareki-numa Nikko Tochigi, 2008 |
v. ansatum 96 x 34 μm L/W=2.8 Omotsubo marsh Niimi Okayama, 2006 |
v. ansatum 91 x 39 μm L/W=2.8 Kashibaru marsh 6 Karatsu Saga, 2006 |
v. ansatum 100 x 41 μm L/W=2.4 Kashibaru marsh 3 Karatsu Saga, 2006 |
v. ansatum 103 x 43 μm L/W=2.4 Kashibaru marsh 5 Karatsu Saga, 2006 |
v. ansatum 91 x 38 μm L/W= Kashibaru m.II Karatsu Saga, 2008 |
v. ansatum 94 x 38 μm L/W= Kashibaru m.3 Karatsu Saga, 2008 |
v. ansatum ? 112 x 53 μm L/W= Kashibaru m.3 Karatsu Saga, 2008 |
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| Similar species -->> E. cuneatum; | |||
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var. pyxidatum: Lateral margins straight or slightly wavy; Apex narrower than dideltiforme; 53-84 μm long, 28-39 μm wide |
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v. pyxidatum ? or E. sinuosum ? v. parallelum 96 x 50 μm L/W= Hanadate SWL Yuri-Honjo Akita, 2008 |
v. pyxidatum ? or v. javanicum ? 86 x 47 μm L/W=1.8 Imori pond Myoko highland Niigata, 2004 |
v. pyxidatum ? or v. javanicum ? 87 x μm L/W= Senjo-ga-hara Nikko Tochigi, 2003 |
v. pyxidatum or v. javanicum ? 76 x 35 μm L/W= Kareki-numa Nikko Tochigi, 2008 |
v. pyxidatum or v. javanicum ? 79 x 36 μm L/W= Motoyu m. Nikko Tochigi, 2008 |
v pyxidatum ? or E. sinuosum ? 100 x 51 μm L/W=2.0 Imori pond Myoko highland Niigata, 2004 |
v pyxidatum ? 90 x 46 μm L/W= Water field Kusu Oita, 2008 |
v. pyxidatum ? or E. sinuosum ? v. parallelum 73 x μm L/W= Omine-numa Tsukiyono Gunma, 2003 |
v. pyxidatum ? or E. sinuosum ? v. parallelum 78 x μm L/W= Omine-numa Minakami Gunma, 2008 |
v. pyxidatum ? or E. sinuosum ? v. parallelum 91 x μm L/W= Ko-numa 3 Minakami Gunma, 2008 |
v. pyxidatum ? or E. sinuosum v. ceylanicum ? 78 x 36, 81 x 38 μm L/W=2.1, 2.2 Maimeno-ike Norikura highland Nagano, 2006 |
v. pyxidatum 65 x 33 μm 75 x 37 μm Water reservoir Iiyama Nagano, 2008 |
| Similar species -->> E. sinuosum; | |||
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var. dideltiforme: Lateral margins straight or slightly wavy; Apex broader than pyxidatum; 81-109 μm long, 42-53 μm wide |
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v. dideltiforme 86 x 43 μm L/W=2.0 Yamakado marsh Nishi-Azai Shiga, 2008 |
v. dideltiforme 100 x 47 μm L/W=2.1 Koshigaya Saitama, 2001 |
v. dideltiforme 94 x 41 μm L/W=2.3 Koshigaya Saitama, 2001 |
v. dideltiforme 94 x 47 μm L/W=2.0 Tashirodaira m. 5 Hakkoda mountain Aomori, 2006 |
| Similar species -->> E. didelta; | |||
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var. javanicum: Lateral margins straight or slightly wavy;
two pores at the center of the semicells; 106 μm long, 52 μm wide |
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v. javanicum 114 x 55 μm L/W=2.1 Yamakado marsh Nishi-Asai Shiga, 2008 |
v. javanicum or v. dideltiforme ? 96 x 46 μm L/W=2.1 Kannon-numa Shimogo Fukushima, 2006 |
v. javanicum or v. dideltiforme ? 104 x 51 μm L/W=2.0 Iyari marsh 1 Omachi Nagano, 2007 |
v. javanicum μm L/W= Water reservoir Iiyama Nagano, 2008 |
v. javanicum or μm L/W= Mi-ike 2 Norikura highland Nagano, 2007 |
v. javanicum or v. dideltiforme ? 80 x 38 μm L/W=2.1 near Omine-numa Minakami Gunma, 2006 |
v. javanicum or v. dideltiforme ? 81 x 40 μm L/W=2.0 Omine-numa 6 Minakami Gunma, 2007 |
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