盅口属Cyathostomum Molin,1861,sensu lato(线虫纲Nematoda,毛线科Trichonematidae)的分类修订

A REVISED CLASSIFICATION OF THE NEMATODE GENUS CYATHOSTOMUM MOLIN, 1861, SENSU LATO (TRICHONEMATIDAE)

盅口属Cyathostomum Molin,1861,not Cyathostoma Blanchard,1849已经拥有相当多的种,对于这个广义的属的进一步分类,迄今还没有一致的意见,不同作者、不同国家常常各自采用不同的分类系统。为此。

A revised classification of Cyathostomum Molin, 1861, sensu lato, is given. The genera are Trichonema, Cyathostomum, Cylieodontophorus, Petrovinema, Cylicotetrapedon, Cylicocyclus, and Skrjabinodentus. Below is a key to the above genera. 1. Dorsal ray cleft, each barnch giving off two lateral branches or very occasionally three...2 Dorsal ray cleft, each branch giving off one lateral branch……Skrjabinodentus Tshoijo, 1957. 2. The posterior margin of the mouth capsule forming a hoop-like thichening……Cylicocyclus Ihle, 1922 The posterior margin of the mouth capsule without a hoop-like thickening……3 3 Elements of the external leaf-crown general small, those of the internal leaf-crown very large and broad……Cylicodontophorus Ihle, 1922 The above character not not present……4 4. The internal leaf-crown arising from the internal sruface of the mouth capsule, some distance from its anterior margin……Cyathostumum Molin, 1861, not Cyathostoma Blanchard, 1849. The internal leaf-crown arising from near the anterior margin of the buccal capsule……5 5. Buccal capsule outline mostly rectangular or trapezium shaped, or somewhat narrower anteriorly than posteriorly, with teeth in its depth …… Cylicotetrapedon Ihle, 1925 Buccal capsule outline mostly rectangular or trapezium shaped, or somewhat narrower anteriorly than posteriorly, without teeth in its depth ……6 6. Buccal capsule large, the wall of the buccal capsule is much thicker posteriorly than anteriorly …… Petrovinema Erschow, 1943 Buccal capsule small, wall of equal thickness, or gradually become somewhat thicker from before backwards…… Trichonema Cobbold, 1874.