474 



PROTOZOOLOGY 



of silkworms, the nosema-disease of honoy bees, microsporidiosis 

 of mosquito larvae, etc. 



Spore with a single polar filament Suborder 1 Monocnidea 



Spore with 2 polar filaments Suborder 2 Dicnidea (p. 478) 



Suborder 1 Monocnidea Leger et Hesse 



Spore oval, ovoid, or pyriform; if subcylindrical length less than 4 



times breadth Family 1 Nosematidae 



Spore spherical or subspherical Family 2 Coccosporidae (p. 477) 



Spore tubular or cylindrical, width less than 1/5 length; straight or 

 curved Family 3 Mrazekiidae (p. 477) 



Family 1 Nosematidae Labbe 



The majority of Microsporidia belong to this family. 



Genus Nosema Nageli. Each sporont develops into a single 

 spore. Numerous species. 



A^. bombycis N. (Fig. 220, a, h). In all tissues of embryo, larva, 

 pupa and adult of Bombyx mori; spores 3-4)u by 1.5-2/i, polar 

 filament 57-72ijl long ; the causative organism of the pebrine dis- 

 ease of the silkworm. 



A^. bryozoides (Korotneff) (Fig. 220, c, d). In germ cells and 

 cavity of Plumatella fungosa and P. repens; spores 7-10/x by 5-6/x. 



Fig. 220. a, b, Nosema bombycis (a, spore, X1470; b, an infected 

 silk-worm larva, X f ) (Kudo) ; c, d, A'', bryozoides (c, infected funiculus, 

 X270 (Braem); d, a spore, X1200 (Schroder)); e, f, N. apis, X1560 

 (Kudo); g-i, iV. cyclopis, X1560 (Kudo); j, k, A^. anophelis, X1600 

 (Kudo); 1, m, Glugea anomala (1, section of an injected G aster osteus 

 aculeatus (Th^lohan) ; m, a spore, X1500 (Stempell)); n, G. hertwigi, 

 X1670 (Weissenberg); o, Perezia mesnili, X800 (Paillot); p, q, Gurleya 

 richardi, X1200 (C^pede). 



