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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. [147]-160 PDF (4.1 MB)

Page 148

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
  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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