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 main lateral nerves fig. These myoblasts are most prominent in the young segments before spermatozoa are found in the vas deferens. Two figures by Creplin 29 are reproduced by Braun The genital pores are situated upon the right-hand margin of the strobila, normally somewhat in front of the middle of each seg- ment fig.
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. In segment it is represented by a little lenticular mass of cells 50 p. In Blanchard’s description the number of testes is given as very few, most often three, which allows a desirable de- gree of latitude to this character. Into it open the cirrus and the vagina, the former posterior and dorsal to the latter.
Before entering the cirrus pouch it passes beyond the base of the latter and then folds back to form a small loop in which are commonly found one or two vesicular enlargements fig. The uterus at first is simply a solid cord of cells fig.
Hymenolepis carioca | definition of Hymenolepis carioca by Medical dictionary
This bulb is apparently homologous to the vaginal sphincter of Drepanidotaenia lanceolata described by Wolff hiigel 00a. Uber den Bau der Taenia infiata Rud. The under surface of the rims is marked by tiny longitudinal ridges in the cuticula, folds made necessary by the decrease in area of the under surface when the rims, instead of extending laterally as in the youngest segments, come to point backward, as they do more and.
It is covered by a prominent layer of nuclei. I am able to confirm Grassi’s observations, in part, as I have sections carilca H. 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.
Through the kindness of Dr.
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Stiles for the op- portunity of comparing with my specimens one from the U. The similarity between the eggs is obvious. These two aggregations of fibers seem to serve the functions of retractors of the cirrus pouch and cirrus, respectively.
The presence of hooks carioc the suckers might ap- pear as a confirmation of the supposition made by Magalhaes that the species is a Davainea, but beyond this characteristic it possesses none of the peculiarities of that genus. From the region of the dorsal vessel where it passes behind the commissure two small canals figs. A division may be necessary, but it must be made upon a different basis than that attempted by Cohn.
PRELIMINARY NOTE ON THE LIFE HISTORY OF HYMENOLEPIS CARIOCA.
The origin of the outer layer is similar to that of H. Notes d’helminthologie bresilienne 8. The worm in question is very slender and delicate. The suckers are spherical, 0. Upon a priori grounds alone such a division seems exceedingly artificial, and indeed Wolffhiigel 00, 00a has demonstrated by two or three cases that it is false and misleading by reason of the non-correspondence of the superficial characters taken by Cohn to more important internal relations.
From hymenolepia diagonal muscles of the proglottis fibers turn in to hymenolfpis to the outer portion of the cirrus sac, serving thus as protractors fig. Ventral view of segments. The apical branches of the median nerves join the ros- tellar ring dorsally and ventrally fig. Beyond this narrow portion the vas deferens is dilated to form a second seminal vesicle figs. Dorsal view of very young segments. The ventral root is long, while the dorsal root is only a mere knob.
The shell gland fig. Deux nouveaux Tenias de la Poule domestique. This cerebral complex corresponds roughly to that of Taenia crassicollis as given by Cohn These cells are to all appearances exactly similar to the cells found in the same position but in much greater numbers in Taenia transversaria, Taenia expansa, and Calliobothri- um coronatum, described by Zschokke 88 as prostate glands.
The outer surface of the projecting rims of the segments is marked by a number of longitudinal grooves fig. Yymenolepis section through the anterior region of scolex. In the regions where the zones approach one another they are connected by interlacing fibers.
It is this outer ring which forms the posterior commissures in T. The remaining few tm continue across to the other side of the segment. Within the pouch is found a further system of fibers fig.
The clear, transparent shell has a thickness somewhat over half a micron. Except for the lack of agreement in the number of testes, Taenia spiculigera? The dorsal canal of each side finally unites with the ventral canal to form a loop right and left carioc the rostellum.