. Animal parasites and parasitic diseases. Domestic animals; Veterinary medicine. 136 PARASITOLOGY. Acanthocephala (Acanthos—thorn) (Cephale—head). This order belongs to the class Nemathelmintha and includes a group of parasites that are round in shape but are not provided with a digestive tract as the order Nematoda; they obtain nourishment by absorption of digested nutrients from the intestinal tract of the host; there are complete sexes, male and female; the cephalic (head) extemity is provided with a globe-shaped proboscis armed with six rows of hooklets by which means it holds on to the m
. Animal parasites and parasitic diseases. Domestic animals; Veterinary medicine. 136 PARASITOLOGY. Acanthocephala (Acanthos—thorn) (Cephale—head). This order belongs to the class Nemathelmintha and includes a group of parasites that are round in shape but are not provided with a digestive tract as the order Nematoda; they obtain nourishment by absorption of digested nutrients from the intestinal tract of the host; there are complete sexes, male and female; the cephalic (head) extemity is provided with a globe-shaped proboscis armed with six rows of hooklets by which means it holds on to the mucous membrane ; it includes the genus Echinorhynchus, species of which infest the small intestines of the dog, others infest birds and still another, the most im- portant, infests the hog. (Echinos—spined) Echinorhynchus Gigas (Rhynchus—proboscis) (Gigas—giant). Distribution.—Very common in theUnited States; also found in Europe. Description .-Round in shape, about two- thirds the calibre of a lead pencil, with transverse markings. Milk white in color; the cephalic extrem- i t y term inate s Fig. 57—EcHiNORHYNCHus Giras, Female, abruptly and is pro- a. Globe-shaped proboscis, armed with six . -. j •., 1 -u rows of hooklets. videdwith a globe- b, Caudal extremity. shaped proboscis that is armed with six rows of hooklets irregularly. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kaupp, Benjamin Franklyn, 1874- [from old catalog]. Chicago, A. Eger
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