. Fresh-water biology. Freshwater biology. PARASITIC FLATWORMS 389 70 (73) Large flattened distomes; ovary and testes both highly branched; uterus median, a short series of transverse coils. Family Fasciolidae Railliet 1895. Large distomes with muscular, more or less broad and flattened leaf-shaped body. Ventral sucker powerful, close to anterior end. Intestinal crura extend to posteror end. Excretory bladder tubular, extends anteriad beyond testes. Genital pore median, at anterior margin of acetabulum. Cirrus and cirrus sac well developed. Ovary lateral, in front of acetabulum, testes symmetr
. Fresh-water biology. Freshwater biology. PARASITIC FLATWORMS 389 70 (73) Large flattened distomes; ovary and testes both highly branched; uterus median, a short series of transverse coils. Family Fasciolidae Railliet 1895. Large distomes with muscular, more or less broad and flattened leaf-shaped body. Ventral sucker powerful, close to anterior end. Intestinal crura extend to posteror end. Excretory bladder tubular, extends anteriad beyond testes. Genital pore median, at anterior margin of acetabulum. Cirrus and cirrus sac well developed. Ovary lateral, in front of acetabulum, testes symmetrical, postacetabular. Vitellaria extensive, reaching posterior end. Uterus short, in condensed coil, entirely preovarian. Eggs very large, thin shelled, in moderate num- bers. Development with alternation of hosts and generations. Parasites in intestine and gall ducts of Mammalia. Reported in North America. Subfamily Fasciolinae Stiles and Hassall 1898 71 71 (72) Anterior tip distinctly set off from main body; vitellaria both dorsal and ventral to intestinal branches. Fasciola Linnaeus 1758. Very large distomes with leaf-shaped body having so-called "cephalic cone" set off at anterior end, and pointed posterior end. Skin spinous. Acetabulum large, at junction of cephalic cone and main body. Esophagus short, with pharynx and prepharynx. Intestinal crura near median line, extend to posterior end, provided on mesial aspect with short branches and on outer side with long branches which again may be branched. Uterus in front of acetabulum, forming a rosette. Vitellaria richly de- veloped in lateral area, and in posterior region also on both surfaces of body. In the gall passages of herbivores, very rarely in Type species. Fasciola hepatica Linnaeus 1758. An introduced species (F. hepatica) common in sheep and cattle in limited regions; Long Island, N. Y., introduced from Texas, Gulf States, California. The North American intermediate host is not known. Stiles suspect
Size: 961px × 2600px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
