158
MARINE MOLLUSCS AS HOSTS FOR SYMBIOSES
Description of stages in mollusc. Anisogamy and sporogony occur in
molluscan host ; oocyst or zygote contains numerous spores ; each spore
includes two sporozoites, each measuring 4-5 p in diameter (Fig. 47).
FIGS. 47-49. stages in the life cycle of Pseudoklo.%sia glomernta. (47) Oocyst enclosing
spores, each in turn containing two sporozoites; (48) gametocysts in process of
entering epithelial lining of nephridium of Tapes jloridus, one (a) in renal excretory
canal, second (b) in hypertrophied host cell, and third (c) in lumen of excretory
canal ; (49) aggregate of parasites in host’s renal cavity. H N , nucleus of host cell.
(Redrawn after LBger and Duboscq, 1915.)
Life cycle. LBger and Duboscq (1915) have given a detailed account
of the formation of micro- and macrogametes from gametocytes in
addition to a detailed cytological account of sporogony. Schizogony
MARINE MOLLUSCS AS HOSTS FOR SYMBIOSES
Description of stages in mollusc. Anisogamy and sporogony occur in
molluscan host ; oocyst or zygote contains numerous spores ; each spore
includes two sporozoites, each measuring 4-5 p in diameter (Fig. 47).
FIGS. 47-49. stages in the life cycle of Pseudoklo.%sia glomernta. (47) Oocyst enclosing
spores, each in turn containing two sporozoites; (48) gametocysts in process of
entering epithelial lining of nephridium of Tapes jloridus, one (a) in renal excretory
canal, second (b) in hypertrophied host cell, and third (c) in lumen of excretory
canal ; (49) aggregate of parasites in host’s renal cavity. H N , nucleus of host cell.
(Redrawn after LBger and Duboscq, 1915.)
Life cycle. LBger and Duboscq (1915) have given a detailed account
of the formation of micro- and macrogametes from gametocytes in
addition to a detailed cytological account of sporogony. Schizogony