Species Groups of the Genus Paramiana contrasta GROUP  The
contrasta species group contains the single species Paramiana
contrasta. Paramiana contrasta exhibits a number of unique
features and a case could be made to apply the available generic
name Euamiana to this single species. The vesica of contrasta is
globular near the its base tapering toward the tail. The spine-
like cornuti are arranged in a single, slightly curved, diffuse
band running along the length of the vesica. No diverticulum is
present. The vesica of the other species of Paramiana have a
large, lateral diverticulum with a row of spines. The female
bursae of contrasta is elongate with the appendix bursae region
and the ductus seminalis reflected backward in a caudal
direction, one of the defining character states of Ruacodes. The
outer ring of the frontal process is more strongly pronounced in
contrasta than in endopolia and the other species of Paramiana,
but both species (contrasta and eupolia) have a distinct central
process. The stronger