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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The subfamily Davaeneinae consequently can no longer be maintained upon its original basis.

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This muscle layer, which is very heavy and prominent in the anterior segments fig. Novae observationes de entozois.

The arrangement of the organs within the cirrus pouch is similar to that of Drepanidotaenia lanceolata Wolff hiigel 00a. Apart from this question it is not even certain that he has wisely modified the definition of the genus in restricting the number of testes to three. Specimens in my possession of Hymenolepis sp. In mature segments the vas deferens is expanded within the cirrus pouch to a large seminal vesicle fig.

A very thin layer of longitudinal muscle fibers forms its outer boundary.

Surrounding each sucker near its posterior pole is a circular ring or zone of nerve fibers, lying in the same horizontal plane as the transverse cerebral commissure, and joined to it at its point of union with the lateral nerve. The number of segments was Both the cirrus pouch and the vagina are dorsal to the nerve and the ex- cretory canal. The rostellum is un- armed. The ventral canal fig.


Ventral view of segments. The possession of armed suckers by a species of Hymenolepis is significant in that it demonstrates how little importance can be attached to such a character in establishing generic relationships.

The structural resemblance is certainly too great to allow of their separa- tion into two different subgenera, if one of the subgenera is also to contain H. The margins of the strobila are serrate fig. It is connected with the latter near the region of crossing by two or three small vessels, and continues ventrad as the outgoing limb of the ventral loop. Some of them are apparently continuations of the other fibers br just men- tioned. Beitrag zur Kenntnis der Vogelhelminthen.

Excretory system in scolex. There is a basket-like plexus of small canals figs. Na- tional Museum, the same from which the figures by Stiles 96 were drawn.

VI-IX, 9 text figs. Whether such action takes place by natural muscular con- tractions is uncertain, but there is certainly a tendency in this di- rection. Histoire naturelle cairoca Helmintb.

[1st proof of Hymenolepis carioca in Lower Austria].

A transverse canal connects the ventral canals in hymenoelpis posterior part of each seg- ment. The accessory lateral nerves are very small and only occasionally evident in cariocs segments, lying a short distance dorsal and ventral from the main nerves. Conard I have had the privilege of seeing his manuscript, as well as his material and preparations, which have proved of great assist- ance in the identification of my specimens. RANSOM form slender, bridge-like connections, so that finally the uterus is modified to a slight degree from its original simple sac-like condi- tion.


It measures as it B. Report upon the Present Knowledge of the Tapeworms of Poultry. Dujardin 45 took two specimens from an Anas boschas, one of which was 52 mm.

The latter is possibly to be identified with Taenia spicidigera Giebel The posterior margins are not prolonged back- ward to any extent, so that there is little or no overlapping of the segments. The main body of the proglottis thus lies anterior to the genital pore, with only the projecting rim extended behind.

Near the middle of the rostellum the dorsal vessel on each side unites with the ventral vessel so that two closed loops are formed. I am able to confirm Grassi’s observations, in part, as I have sections of H.

PoultryDVM Pathogens A-Z | Hymenolepis carioca

RANSOM The dorsal canal continues toward the ventral hyymenolepis, passes around the posterior face of the ventral sucker, and after completing the circuit curves outward and forward to pass anteriad between the dorsal and ventral sucker fig. In ripe segments the last fig. Frontal section through a mature segment No. Cirrus pouch and seminal receptacle. Hymenolepis megalops Nitzsch Was first found by Nitzsch in the intestine of Anas boschas and Dafila acuta.