DistomaDistomumn.

Etymology: modern Latin, Gaertner 1775, < Greek δίστομος, δίστομον double-mouthed, < δι- twice + στόμα, plural στόματα mouth. The form distoma has plural diˈstomata; distomum, plural distoma. The etymological form is Distomum representing Greek δίστομον; Distoma as a neuter, with plural Distomata is absurd, such a form as δίστομα, -όματα, being impossible in Greek But Distoma as a feminine of modern formation, would be admissible.Previous versions of the OED give the stress as: ˈDistoma.

Zoology.

A genus of digenetic Trematoda, parasitic worms or flukes, having two suckers (whence the name), of which numerous species infest the alimentary canal, liver, etc., of vertebrates, the best-known being the liver-fluke ( D. hepaticum) which causes rot in sheep. It is the typical genus of the family Distomidæ.

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the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Platyhelminthes > [noun] > class Trematodes > order Digenea > suborder Prostomata > division Distomata > distoma hepaticum

liver flukec1795

Distoma1854

distome1876

distomian1876

liver distome1897

brainworm1969

1854 R. G. Mayne Expos. Lexicon Med. Sci. (1860) 280/1 Distoma., Zool., name of a genus of the Entozoa Trematodea, in which there is a sucker at the anterior extremity of the mouth, and a cup a little posterior to it on the venter.

1871 T. R. Jones Gen. Outl. Animal Kingdom (ed. 4) vii. 158 The now tailless animal assumes the appearance of a Distoma or fluke.

1876 J. Van Duyn & E. C. Seguin tr. E. L. Wagner Man. Gen. Pathol. 120 The young..in the distomata go through a complicated alternate generation connected with metamorphosis.

1884 Public Opinion 12 Sept. 331/1 Death caused by..distoma.

1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 643 On the oral extremity of some species of Distomum.

attributive.1885 W. Roberts Urinary & Renal Dis. (ed. 4) iii. xiii. 650 We no longer doubt that the symptoms were produced by distoma-processes.

Derivatives

diˈstomian n. a member of the family Distomidæ, or group Distomea.

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