Family: Unicells or cells loosely attached forming hyphae; cell body varied in shape, a constriction at the center in most species; cell walls consisting of two or more parts, with small pores and various ornaments (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Cell body flat, constricted at the center; semicells with two small projections at their apexes; cells connected with each other by the projections.

Google Image Search

S. vertebratum 16 x 18 μm Uruguay, 1999
Sphaerozosma excavatum -> Teilingia excavata
S. excavatum 8.5 x 9 μm Iroha-numa Zao mountain Yamagata, 2005	S. excavatum 9 x 9.5 μm Iroha-numa 2 Zao mountain Yamagata, 2006	S. excavatum 9-10 x 9-10 μm Ko-numa Tsukiyono Gunma, 2007	S. excavatum or S. granulata ? 10 x 10 μm Shijuhachi-ike 2 Shiga highland Nagano, 2006
S. excavatum 9 x 9 μm Ushidome-ike Norikura highland Nagano, 2006
Sphaerozosma granulata -> Teilingia granulata
S. gramulata ? 9 x 9.5 μm Iroha-numa 3 Zao mountain Yamagata, 2006	S. gramulata ? 9.5 x 11 μm Obihiro-Hasshonochi Obihiro Hokkaido, 2005	S. gramulata ? Numappara marsh Kuroiso Tochigi, 2003	S. gramulata ? Sa-numa park Shimotsuma Ibaraki, 2003
S. gramulata ? 8.5 x 9 μm Bessho numa Saitama, 2001	S. gramulata ? 9 x 8-10 μm Kowashimizu Suwa Nagano, 2005	S. gramulata ? 9-11 x 9-11 μm Kowashimizu Suwa Nagano, 2007	S. gramulata ? 9-9.5 x 10 μm Nozomiko 2 Myoko highland Nagano, 2007
S. gramulata ? 9 x 9.5 μm Kejo-numa 1 Osaki Miyagi, 2006	S. granulata or S. excavatum ? 9 x 10 μm Tane-ike Togakushi highland Nagano, 2005	S. granulata μm Numappara marsh Kuroiso Tochigi, 2003
S. granulata 9-10 μm Karakemi marsh Omachi Nagano, 2006	S. granulata 10.5 x 13 μm Maimeno-ike Norikura highland Nagano, 2006	S. granulata 10-11 x 10 μm Dojo-ike Norikura highland Nagano, 2006	S. granulata 10 μm Kodanuki marsh Fujinomiya Shizuoka, 2006
S. granulata μm Ko-numa Minakami Gunma, 2008
Sphaerozosma excavatum or Spondylosium ?
S. excavatum or Spondylosium ? 9-10 x 8-10 μm Ushidome-ike Norikura highland Nagano, 2005	S. excavatum or Spondylosium ? 12 x 9 μm Azami-ike Norikura highland Nagano, 2006

Similar genus -->> Spondylosium; Onychonema;

Please click on species name for more images.

Copyright Protist Information Server