The Post-embryonic Developmental Stages of Cestodes

Voge, Marietta

doi:10.1016/s0065-308x(08)60379-6

Cited by 20 publications

(5 citation statements)

References 80 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the classical definitions of cysticercoids and cysticerci, it has always been an essential characteristic whether fully-developed scoleces were invaginated or retracted, although these terms were used interchangeably by Wardle and McLeod (1952). In their reviews on cestode post-embryonic development, Voge (1967) and Šlais (1973) considered scolex retraction or invagination as prominent, key developmental features. Freeman (1973), on the other hand, did not include this character in his phylogenetic analysis because he considered the scolex as a labile structure, stating that "there is some evidence that the scolex of the metacestode may evert and retract as need be…" (Freeman 1973;p.…”

Section: Significance Of Scolex Invagination or Retractionmentioning

confidence: 99%

Post-embryonic development and ultrastructural characteristics of the polycephalic larva of Taenia parva Baer, 1926 (Cyclophyllidea, Taeniidae)

Z¹,

Miquel²,

Młocicki³

et al. 2007

Acta Parasitologica

View full text Add to dashboard Cite

Post-embryonic development and fully-formed polycephalic larvae of Taenia parva Baer, 1926 were examined by light (LM) and transmission electron microscopy (TEM). Three developmental stages were recognised: (1) an early stage of exogenous budding at the surface of the central vesicle; (2) a stage of polycephalic cyst development accompanied by segmentation of the growing larval strobile and an obvious decrease in the size of the central vesicle; (3) fully-formed larval strobile and invaginated scoleces. In fully-developed encysted polycephalic larvae, there are usually 14-24 segmented larval strobilae, each terminating with an invaginated scolex; larval strobilae arise from a common central vesicle and remain attached posterior to it during the entire development. The number of segments varies between 109 and 120 per larval strobila. The polycephalic larvae examined closely resemble the strobilocercus type of taeniid larvae. The structure of developing and fully-formed larvae was examined by TEM. The tegument, scolex, subtegumental musculature of the strobilar segments, protonephridial system, calcareous corpuscles and medullary parenchyma of larvae exhibit general similarity with the same structures in adults at both LM and TEM levels. The morphogenesis of the larva of T. parva is compared with that of the polycephalic larvae of other Taenia spp. (T. krepkogorski, T. twitchelli and T. endothoracica) and with other asexually-multiplying cestode larvae (mesocestoidids, hymenolepidids and dilepidids).

show abstract

Section: Significance Of Scolex Invagination or Retractionmentioning

confidence: 99%

Post-embryonic development and ultrastructural characteristics of the polycephalic larva of Taenia parva Baer, 1926 (Cyclophyllidea, Taeniidae)

Z¹,

Miquel²,

Młocicki³

et al. 2007

Acta Parasitologica

View full text Add to dashboard Cite

show abstract

“…However, Mead and Olsen (1971) reported that O. filaroides developed in the final host, the tiger salamander (Ambystoma tigrinum), directly without any second intermediate host. Voge (1967) also thought this was a typical pattern of Proteocephala including Ophiotaenia. It is regretted that in the next experiment, the development in other hosts were not successful.…”

Section: Discussionmentioning

confidence: 90%

The experimental development of Ophiotaenia monnigi Fuhrmann, 1924 in Cyclops leuckarti

Cheng

Lin

2008

Parasitol Res

View full text Add to dashboard Cite

Cyclops leuckarti and C. prasinus can serve as the intermediate hosts of Ophiotaenia monnigi, Fuhrmann, 1924. From the hexacanth, the parasite developed to a mature procercoid larva without a cercomere, although it appeared in the development processes. At the two-part development stage, all the hooks transferred to the cercomere, and it dropped off in the latest time of the larval developing. In the development, a coelom presented in the front part as well as in the cercomere. An apical appeared, and two pairs of gland cells were found after the sucker. The whole developmental course took more than 11 days, and it was even longer in the host, C. prasinus, in which the parasite larva developed slower.

show abstract

“…During the enteral period of its life, the worm exists as an adult that continu ally sheds segments ova-containing. Ova may be imbibed by its intermediate host, the pig, and develop into larvae (oncospheres and mctacestodes), which can exist in the paren teral environment or, if the egg is eaten di rectly by the human host, the worms behave the same as if they were in the intermediate host [3], Upon emerging from the egg, the hexacanth (6-toothed) larva penetrates the intestinal wall and travels via lymphatics and vascular system to muscles and central ner vous system [4, 5J. As the larva (or onco sphere) develops, it becomes the metacestode or cysticercus.…”

Section: Discussionmentioning

confidence: 99%

Electron Microscopic Observations of Intravitreal <i>Cysticercus cellulosae (Taenia solium)</i>

Friedman¹,

Pokorny²,

Suhan³

et al. 1980

Ophthalmologica

View full text Add to dashboard Cite

Cysticercus cellulosae, the larval stage of Taenia solium, was studied by light and electron microscopy after its removal from the vitreous. The ultrastructure of the larva is highly organized and displays a superficial tegument and deeper parenchyma. The tegument contains a microvillous surface overlying a syncytial cytoplasm. A deeper muscular layer overlies the parenchyma, within which are highly specialized structures important in water balance, flame cells, and acid-neutralizing calcareous corpuscles.

show abstract

The Post-embryonic Developmental Stages of Cestodes

Cited by 20 publications

References 80 publications

Post-embryonic development and ultrastructural characteristics of the polycephalic larva of Taenia parva Baer, 1926 (Cyclophyllidea, Taeniidae)

Post-embryonic development and ultrastructural characteristics of the polycephalic larva of Taenia parva Baer, 1926 (Cyclophyllidea, Taeniidae)

The experimental development of Ophiotaenia monnigi Fuhrmann, 1924 in Cyclops leuckarti

Electron Microscopic Observations of Intravitreal <i>Cysticercus cellulosae (Taenia solium)</i>

Contact Info

Product

Resources

About