Studies On the Factors Controlling the Rate of Regeneration 3, No. 1
Studies On the Factors Controlling the Rate of Regeneration 3, No. 1
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scleroporum they open separately. Looss (1899 : 551) says one of the most important of generic characters is the structure of the copulatory organs. In A. magnum the testes are further posteriad and the ovary is situated one-fourth to one-third of the body length from the posterior end instead of at the level of the anterior margin of the acetabulum as is the case in S. scleroporum. In 8. scleroporum the testes and ovary are widely separated and in A. magnum they are compara- tively close toget...her. These differences appear to be of sufficient impor- tance to exclude the American species from the genus Schizamphistoma.
A. magnum agrees with S. spinulosum in the presence of oral evag- inations and lack of preoral sphincter, but differs from it in the manner of the coiling of the excretory vesicles, in the presence of a common herm- aphroditic duct and in the character of the vitellaria, as well as the rela- tive positions of the testes and ovary. The morphological facts show differences too fundamental to permit the inclusion of both these species in a single genus.
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To quickly assess the difficulty of the text, read a short excerpt:
scleroporum they open separately. Looss (1899 : 551) says one of the most important of generic characters is the structure of the copulatory organs. In A. magnum the testes are further posteriad and the ovary is situated one-fourth to one-third of the body length from the posterior end instead of at the level of the anterior margin of the acetabulum as is the case in S. scleroporum. In 8. scleroporum the testes and ovary are widely separated and in A. magnum they are compara- tively close toget...her. These differences appear to be of sufficient impor- tance to exclude the American species from the genus Schizamphistoma.
A. magnum agrees with S. spinulosum in the presence of oral evag- inations and lack of preoral sphincter, but differs from it in the manner of the coiling of the excretory vesicles, in the presence of a common herm- aphroditic duct and in the character of the vitellaria, as well as the rela- tive positions of the testes and ovary. The morphological facts show differences too fundamental to permit the inclusion of both these species in a single genus.
What to read after Studies On the Factors Controlling the Rate of Regeneration 3, No. 1?
You can find similar books in the "Read Also" column, or choose other free books by Charles Zeleny to read onlineMoreLess
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