The Philippine journal of science. [Vol. 57, no. 1]

57, 2 Africa and Garcia: Trematodes of Man and Dog 255

Eggs 0.021 by 0.013 mm, symmetrically oval with distinct
"shouldering" at opercular end.
Specific diagnosis.-Heterophyes: Size 2.1 mm by 0.4 mm,
body leaflike; prepharynx long and capillary, pharynx large, 0.12
mm in diameter; esophagus short; intestine simple tubes; acetabulum removed considerably anterior from equator, alongside
but independent of the genital sac; ovary in the middle of the
body directly anterior to anterior testes; vitellaria long, closely
applied to the lateral margin of body; testes removed from the
posterior end of body, one behind the other in a straight line;
uterine coils extend beyond posterior border of hind testes to
extreme posterior end of body; genital sac close behind acetabulum, a little to the left, filled by a mushroomlike, apparently
protrusible gonotyl, which bears a circlet of about 105 rodlets;
eggs, 0.021 by 0.013 mm.
Host.-Native dog.
Location.-Small intestine.
Locality.-Manila, Philippine Islands.
Type specimen.-Parasitological collection, School of Hygiene
and Public Health, University of the Philippines.
Remarks.-Witenberg (1929), following a thorough revision
of members of the family Heterophyide, has discarded many
members of doubtful validity from the genus Heterophyes, and
recognized as valid only three species of this genus; namely,
Heterophyes heterophyes Siebold, 1852, Heterophyes dispar
Looss, 1902, and Heterophyes xqualis Looss, 1902. All the rest
with the exception of Heterophyes nocens Onji and Nishio, 1915,
which he said required further study to establish its validity, are
considered synonyms of either one or another of the surviving
species. However, Lane (1929) seems quite definite that H. nocens, which is most likely identical with H. katsuradai Osaki
and Azada, 1926, is synonymous with the type species Heterophyes heterophyes.
Our specimens differ from the three established species of the
genus in that (a) their testes are removed from the posterior
extremity of the body and placed one behind the other, whereas
in the established species they are obliquely in the hindermost
portion of the body; (b) the vitellaria in our specimens are
long and closely applied to the lateral margin of the body, whereas in the established species they are short with median distribution of their follicles confined between testes and ovary; (c)
the ventral sucker in our specimens is far removed anteriorly