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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 150


150    Wisconsin Academy of Sciences, Arts, and Letters.
  Sixteen specimens of this trematode were taken from the intes-
tine of a mooneye caught in Lake Pepin, June 25, 1920. Two
other mooneyes were captured at the same time. One contained
twenty-one of the parasites; the other, none.
               Allocreadium armatutm MacCallum
                            (Fig. 8)
  Length of a large contracted specimen, 3.2 mm. (U. S. Nat.
Mus., Cat. No. 7620); width, 1.08 mm.; diameter of oral sucker,
.35 mm.; diameter of acetabulum, .6 mm.; egg, .11 by .07 mm.
Length of a smaller expanded specimen, 2.8 mm.; width, .53 mm.
Cuticle minutely denticulate, especially toward the anterior end.
  The diameter of the oral sucker is nearly two-thirds that of
the acetabululm, which is situated at the posterior end of the an-
terior third of the body. A short prepharynx is present. The
pharynx is about half the diameter of the oral sucker in length, and
it is about as wide as long. The intestinal rami are slender and
reach nearly to the posterior end of the body.
  The ovary is about half as long as the anterior testis and oval,
with the long axis extending across the body. It lies on the right
side of the body just behind the acetabulum. The uterus is coiled
between the acetabulum and the anterior testis, lying mostly on
the left side. It may contain as many as eleven eggs. The genital
pore is on the median line anterior to the acetabulum. The vitel-
line glands surround the intestinal rami in the posterior third of
the body and extend forward outside the rami nearly to the
middle of the acetabulum.
  The two testes are somewhat lobate and are slightly elongated;
their long axes lying across the body. They lie close together
immediately posterior to the ovary between the intestinal rami,
one being directly behind the other. The posterior testis is slightly
larger than the anterior. The cirrus pouch is oval, about a third
as wide as long, and is about as long as the diameter of the
acetabulum.
  Sixty-five specimens were taken from a sheepshead, Aplodinotus
grunniens Rafinesque, caught in Lake Pepin, Wisconsin, July 9,
1920. Other specimens were taken from the same locality and
species on July 10, 13; from sunfishes Eupomotis gibbosus (Lin-
naeus) at Sturgeon Bay, Wisconsin, July 19, 23.


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