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Homalometron pallidum
''Homalometron pallidum'' is a species of marine fluke in the class Trematoda. It is an endoparasite of the mummichog, ''Fundulus heteroclitus'', a small fish found in brackish water along the east coast of the United States and Canada. It has a complex life cycle and lives inside several different host species at different stages.
==Description==
The original description of ''Homalometron pallidum'' was given by Linton in 1899 and reads:
"Body very minutely spinose, white, translucent; acetabuhuni and oral sucker about same size; outline of body, long oval; neck short, continuous with body; greatest breadth in region of testes, near posterior end; ecaudate; acetabuhum sessile; ranii of intestines simple, elongate ; esophagus as long as pharynx; testes, two, in median line behind uterus; seminal vesicle dorsal to ovary and posterior border of acetabulum; ovary between acetabulum and testes, on right side; pharynx, subglobular; genital aperture in front of acetabulum, on median line; vitelline glands lying at posterior end and along sides of body as far
as acetabulum; ova few, relatively large."
"Dimensions of specimen in formalin, given in millimeters: length, 2.72; breadth, anterior 0.43, at acetabulum 0.89, middle 1.07; near posterior 0.36 ; diameter of oral sucker, 0.26; diameter of acetabulum, 0.29; diameter of ovary, 0.21; diameter of testes, 0.33 and 0.39; ova, 0.11 and 0.07 in the two principal diameters."
Stafford used these diagnostic characteristics when he formally described the species in 1904. He was criticized for doing so in 1907 by the German parasitologist, Arthur Looss, who considered the description insufficient, pointing out that it was not possible to use this description to distinguish this species from other similar parasitic flukes.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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