Juday, Chancey (ed.) / Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume XXI (1924)
Pearse, A. S.
Observations on parasitic worms from Wisconsin fishes, pp. -160 PDF (4.1 MB)
148 Wisconsin Academy of Sciences, Arts, and Letters. The oral sucker is small; the pharynx is almost 11/2 times as long as wide; esophagus, very slender, about three times as long as pharynx; intestinal rami, thick, extending to posterior end of the body. Vitelline glands are in contact with the lateral surfaces of the intestinal rami, extending from the acetabulum to the tips of the rami; a duct from each group of glands extends directly across the body to the middle where it unites with that from the opposite side and enters a rounded yolk reservoir. The testes are somewhat lobate and elongated antero-posteriorly. They lie between the intestinal rami and the posterior, median ,excretory duct. Cirrus sac: very small and ovate. The ovary lies just anterior to the vitelline ducts. It is lobate and elongated. The uterus is filled with eggs and occupies the space between the intestinal rami, from the acetabulum to the posterior end of the body. The bullheads in Lake Pepin were often infected with this trematode. Figure 6 was drawn from a specimen taken from the swim bladder of Ameiurus melas, July 12, 1920 (U. S. Nat. Mus., Cat. No. 7618). Other specimens were found in the swim bladders of A. natalis and A. nebulosus. Young specimens were found encysted in the liver peritoneum of a Schilbeodes gyrinus, June 23, 1920. MACRODEROIDES, new genus Elongated Plagiorchiidae with the two suckers of nearly equal size. The genital opening is at the anterior margin of the aceta- bulum. A slender prepharynx and a longer esophagus are present. The intestinal rami arise from the esophagus some distance anterior to the acetabulum. The body is covered with sharp spines which decrease in size posteriorly. The vitelline glands extend from a short distance behind the acetabulum to the posterior testis. The genus shows resemblances to Macrodera Loos, Iaptometra Loos, -and Glypthelmins Stafford. Type species: Macroderoides spiniferus, Pearse. Macroderoides spiniferus, new species (Fig. 9) Type: Cat. No. 7619, U. S. National Museum; Lake Pepin, Wisconsin; July 11, 1920; collector, A. S. Pearse.
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