S. elegans ?
	 375 x 60 μm
	 Onnenai
	 Kushiro marsh
	 Hokkaido, 2005 | 
 
	 S. elegans ?
	 320 μm
	 Senjo-ga-hara
	 Nikko
	 Tochigi, 2003 | 
 
	 S. elegans
	 241 x 60 μm
	 Shirakawa
	 Fukushima, 1999 | 
 
	 S. elegans
	 242 x 54 μm
	 Kawaguchi Natural p.
	 Kawaguchi
	 Saitama, 2005 | 
 
	 S. elegans
	 167 x 45 μm
	 Iyari marsh
	 Omachi
	 Nagano, 2006 | 
 
	 S. elegans
	 162 x 58 μm
	 Imou bog
	 Toyohashi
	 Aichi, 2004 | 
 
	 S. elegans
	 130 x 35 μm
	 Lake Shirakaba
	 Tateshina & Chino
	 Nagano, 2005 | 
 
	 S. elegans ?
	 - Valve view -
	 138 x 53 μm
	 Japan, 1998 | 
 
	 S. capronii
	 170 x 65 μm
	 Kitayama park
	 Higashi-Murayama
	 Tokyo, 2004 | 
 
	 Surirella sp.
	 206 x 50 μm
	 Japan, 1998 | 
 
	 S. robusta ?
	 - Girdle view -
	 138 x 75 μm
	 Japan, 1998 | 
 
	 S. robusta ?
	 - Girdle view -
	 230 x 110 μm
	 Omotsubo marsh
	 Tetta-cho
	 Okayama, 2004 | 
 
	 S. robusta ?
	 - Girdle view -
	 310 x 136 μm
	 Ichinose-enchi
	 Norikura highland
	 Nagano, 2005 | 
 
	 S. robusta ?
	 - Girdle view -
	 162 x 118 μm
	 Omotsubo marsh
	 Tetta-cho
	 Okayama, 2004 | 
 
	 S. robusta ?
	 - Girdle view -
	 162 x 118 μm
	 Igashira park
	 Mooka
	 Tochigi, 2006
	
   | 
 
	 S. robusta ?
	 - Valve view -
	 152 x 50 μm
	 Omotsubo marsh
	 Tetta-cho
	 Okayama, 2004 | 
 
	 Surirella sp.
	 315 x 62 μm
	 Onnenai
	 Kushiro marsh
	 Hokkaido, 2005 | 
 
	 Surirella sp.
	 - Girdle view -
	 140 μm
	 Zenko-ji
	 Nagano, 2003 | 
 
	 Surirella sp.
	 - Girdle view -
	 134 x 56 μm
	 Japan, 1998 | 
 
	 Surirella sp.
	 87 x 41 μm
	 Imou bog
	 Toyohashi
	 Aichi, 2004 | 
 
	 S. tenera ?
	  μm
	 Lake Shoji
	 Yamanashi, 1997 | 
 
	 S. linearis ?
	 86 x 37 μm
	 Numa-no-hara m.
	 Madarao highland
	 Niigata, 2005 | 
 
	 S. linearis ?
	 119 x 27 μm
	 Yoshigadaira m.
	 Shirane mountain
	 Gunma, 2005 | 
 
	 S. linearis ?
	 101 x 33 μm
	 Sukawa highland
	 Kurikoma mountain
	 Akita, 2005 | 
 
	 S. linearis
	 or S. ovalis ?
	 33 x 16 μm
	 Kawaguchi n.p.
	 Kawaguchi city
	 Saitama, 2005 | 
 
	 S. linearis ?
	 71, 80 x 31 μm
	 Japan, 1998 | 
 
	 S. pantocsekii
	 73 x 12-16 μm
	 Kitayama park
	 Higashi-Murayama
	 Tokyo, 2004 | 
 
	 Surirella sp.4 ??
	 55 x 50 μm, x 400
	 Japan, 1998 | 
 
	 Surirella sp.5 ??
	  μm
	 Japan, 1999 | 
 
	 Surirella sp.3
	 31 x 13 μm, x 400
	 Japan, 1998 | 
 
	 Surirella sp.3
	 30 x14 μm
	 Japan, 1998 |