Two New Species of Alloglossidium Simer 1929 (Trematoda: Macroderoididae) from Minnesota Leeches

Abstract

The adult Alloglossidium turnbulli sp. n. is described from the intestine of Haemopis grandis. It differs from other members of the genus in having the ovary larger than either testis and in the nature and placement of tegumental spines and vitellaria. A. hamrumi sp. n. is described from adults from the intestine of Haemopis plumbea and Macrobdella decora. It is closely related to A. macrobdellensis Beckerdite and Corkum 1974, but differs in the extent of vitellaria and spines, width of individual spines, size of cirrus pouch, and location of Mehlis' gland. The first adult trematode reported from leeches was Alloglossidium hirudicola Schmidt and Chaloupka 1969, from the gastric ceca of preserved leeches, Haemopis sp., of unknown origin. Taft and Kordiyak (1973) reported the natural occurrence of flukes they regarded as A. hirudicola in Wisconsin leeches, Haemopis sp. and Macrobdella decora. A second species, A. macrobdellensis, was described from Macrobdella ditetra from Louisiana by Beckerdite and Corkum in 1974 and a partial life history was reported by Corkum and Beckerdite in 1975. Examination of six species of hirudinid leeches from Minnesota and Iowa during the summer of 1974 revealed material which, when compared with examples of A. hirudicola and A. macrobdellensis from Minnesota leeches and A. corti from bullheads, represents two new species. Details on incidence and host specificity of all species of adult trematodes found in Minnesota leeches will be presented in a later paper. Flukes were removed from the intestines of leeches narcotized with sodium pentabarbital and studied alive or fixed in AFA. Whole mounts were fixed with light coverslip pressure and stained with Mayer's paracarmine and fast green. Specimens for sectioning were fixed without flattening, cut at 8 /jm and stained with hematoxylin and eosin. Drawings were made with the aid of a microprojector and all measurements are in micrometers unless otherwise indicated. The description of A. Received for publication 25 July 1975. * Supported in part by a grant from the Gustavus Research Fund. t Present address: Department of Anatomy, University of Michigan, Ann Arbor, Michigan 48104. turnbulli is based on serial cross sections of four specimens and 53 whole mounts, and that of A. hamrumi on three sets of serial cross sections and 25 whole mounts. Measurements were taken from 20 representative whole mounts of each species and ranges are presented followed by averages in parentheses. Names of hirudinid leeches follow Sawyer