PRELIMINARY NOTE ON THE LIFE HISTORY OF HYMENOLEPIS CARIOCA. By Myrna F. Jones. See allHide authors and affiliations. Science 23 Nov Hymenolepis may refer to: Hymenolepis (plant) · Hymenolepis (tapeworm) · Disambiguation icon. Disambiguation page providing links to articles with similar . 1. Science. Nov 23;68() PRELIMINARY NOTE ON THE LIFE HISTORY OF HYMENOLEPIS CARIOCA. Jones MF. PMID:

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That this difference is not so important as may seem is shown by the fact that the number of testes in humenolepis of H.

The fact alone that it has a definite and persistent uterus precludes the possibility of such a generic relationship, and furthermore its close structural resem- blances to the type of Hymenolepis justify its immediate carioxa to that genus.

The posterior margins are not prolonged back- ward to any extent, so that there is little or no overlapping of the segments. The median and accessory lateral nerves are con- nected behind the complex by numerous commissures with one an- other and with the main lateral nerves. With progressing de- velopment a cavity is formed by a hollowing out of the cord, and humenolepis uterus becomes a thin-walled sac which grows backward on the dorsal side of the ovary.

The lateral nerves are joined in three regions fig. These myoblasts are most prominent in the young segments before spermatozoa are found in the vas deferens. In the parenchyma of the rostellum, just be- neath the cuticula lining hymebolepis cavity, is a dense layer of cells fig. The round neck measures from 0. In the scolex the canals of both sides turn inward and approach each other as they pass forward.


Cirrus pouch and seminal receptacle.

From the diagonal muscles of the proglottis fibers turn in to attach to the outer portion of the cirrus sac, serving thus as protractors fig.

In two specimens examined the dorsal limb of the right-hand loop came from the ventral vessel, of the left-hand loop from the dorsal vessel fig. hynenolepis


Brief synopsis in Brann Hymenolepis carioca is remarkable by reason of the small number of these bands, and their relatively large size. The dorsal canal fig. From the region of the dorsal vessel where it passes behind the commissure two small canals figs. A head, sectioned in situ with a piece of intestine, pos- sessed, upon the suckers, hooks fig. Search the history of over billion web pages on the Internet. In the center of the anterior surface is the caroica orfice of the cavity of the rostellum.

Hymenolepis – Wikipedia

The slender, pointed blade forms an angle of 90 to with the ventral root. The uterus develops in front of the yolk and shell glands, imme- diately dorsal to the ovary. I was unable to demonstrate, however, that these cells opened into the cavity of the vas deferens in H.


In Main lateral nerve. The cirrus pouch cpcaeioca vesicle vsand seminal receptacle acrioca are usually easily recognizable in toto specimens.

Strobilation begins immediately behind the head, and is very distinct almost from the first, by reason of the deep constrictions between the segments. The head is large, 1 mm. Branches of the excretory system apparently sim- ilar to these loops have been described by Mingazzini 99 for Hymenolepis murina.

Through the kindness of Dr. As the uterus enlarges the ovary quickly disappears, and the former soon comes to occupy all the available space within the proglottis fig. Both the cirrus pouch and the vagina are dorsal to the nerve and the ex- cretory canal. It is almost cylindrical, rarely perfectly straight, but bent more or less, usually toward the ventral caruoca in a gentle curve fig. A carioda may be necessary, but it must be made upon a different basis than that attempted by Cohn.

Two of the worms were young and immature. In the scolex the former measure 6 hmenolepis, the latter 4 p.