Macroderoides trilobatus sp. n. (Digenea: Macroderoididae) from the Bowfin, Amia calva, and Emendation of the Genus

Abstract

Macroderoides trilobatus sp. n. is described from the bowfin (Amia calva Linn.) from Georgia. The genus Macroderoides is emended to include a trilobed ovary which distinguishes the new species. Dying fish collected from the Ochlocknee River, Colquit County, Georgia, during a period of very low water were sent to the Southeastern Cooperative Fish Disease Project -yw-? Diagnostic Laboratory. Examination revealed PRE a new species of Macroderoides parasitic in r ,l P the intestine of a bowfin (Amia calva). SpeciE mens were fixed in hot 10% formalin and whole mounts were stained with Semichon's carmine. All measurements are in micrometers. Ranges, given in parentheses, are based on c measurements from nine mature specimens. GP Macroderoides Pearse 1924 Char. emend. Generic diagnosis: Macroderoididae, Macroderoidinae. Body elongate, heavily spined. Oral cl sucker nearly terminal; prepharynx distinct; pharynx small; esophagus short, bifurcating about midway between suckers; ceca terminating near posterior extremity. Acetabulum comparatively small, in anterior half of body. Testes slightly oblique to tandem, in posterior half of body. Cirrus pouch overreaching acetabulum, containing L bipartite seminal vesicle, well-developed prostate l complex, and long thick cirrus. Genital pore v median or submedian, immediately preacetabular. Ovary submedian, compact or lobed, well posterior to acetabulum. Seminal receptacle and Laurer's canal present. Vitellaria follicular, extending from u mid or postacetabular level to mid-posterior testes or posterior extremity. Uterus descending to posterior extremity; egg small. T