Structure and Ultrastructure of the Larvae and Metacestodes of Hymenolepis Diminuta

Ubelaker, John E.

doi:10.1016/b978-0-12-058980-7.50007-5

Cited by 25 publications

(34 citation statements)

References 83 publications

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“…Filamentous microtriches have been recorded from all cestode groups examined (e.g., Caryophyllidea: Hayunga 1991; Trypanorhyncha: Hildreth and Lumsden 1987;Palm et al 1998;Proteocephalidea: Thompson et al 1980;Cyclophyllidea: Hess and Guggenheim 1977;Ubelaker 1980); they are most abundant and were previously considered as the prototype microthrix by Holy and Oaks (1986). Also in the present study these microtriches were found on all six species examined and in all dierent scolex portions.…”

Section: Filamentous Microtrichesmentioning

confidence: 54%

Sensory receptors and surface ultrastructure of trypanorhynch cestodes

2000

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The scolices of six different trypanorhynch species--Heteronybelinia alloiotica (Dollfus, 1960), Pseudolacistorhynchus noodti Palm, 1995, Otobothrium cysticum (Mayer, 1842), O. penetrans Linton, 1907, Poecilancistrum caryophyllum (Diesing, 1850), and Prochristianella hispida (Linton, 1890)--were examined for surface morphology and the occurrence of sensory receptors. Filamentous microtriches with different internal ultrastructural features were found. Acerosate, hook-like, and spiniform microtriches were detected on the surface of the tentaculariid H. alloiotica. Their internal structure clearly differed from that of pectinate microtriches observed in the other five trypanorhynch species lacking a basal and a junctional region. All pectinate microtriches had the same general architecture, independent of the number of digitiform processes. All trypanorhynchs studied harbored ciliated sensory receptors within the tegument. Even though sensory receptors were scarce in H. alloiotica, they were more abundant in the lacistorhynchid P. noodti and the otobothriids P. caryophyllum and O. penetrans, which exhibited two, six, and three kinds of receptors, respectively. Bothridial pits in O. penetrans and O. cysticum were invaginations of the bothridial surface, being characterized by the lack of sensory receptors and the presence of characteristic microtriches. These differed from other microtriches in that they were larger and had a base consisting of a widely enlarged matrix. The occurrence of different kinds of microtriches and sensory receptors within trypanorhynch cestodes is summarized, and the meaning of these surface structures and of bothridial pits as characters within future trypanorhynch classification is emphasized.

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Section: Filamentous Microtrichesmentioning

confidence: 54%

Sensory receptors and surface ultrastructure of trypanorhynch cestodes

2000

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“…In other cestode groups, there are numerous more recent LM and TEM studies on larvae, mostly in other cyclophyllidean families; some have been reviewed by Ubelaker (1980Ubelaker ( , 1983 and Jarecka et al (1981). Other studies on various types of larval cestodes (Caley 1974(Caley , 1976Burt and Jarecka 1984;Krasnoshchekov and Pluzhnikov 1984;Burt 1987;Conn 1986Conn , 1988aConn , 1990Conn , 2005Conn et al 2002;Galán-Puchades et al 2002;OEwiderski et al 2002a;Georgiev et al 2005) have yet to be reconsidered in a broader comparative context.…”

Section: Introductionmentioning

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

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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).

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“…In some aquatic groups, the inner envelope also provides motility for the larva by developing as a ciliated free-swimming larval stage, which must emerge from the outer envelope and shell before swimming (Berrada-Rkhami andGabrion 1990, Świderski 1994a). When the oncosphere larva, including its surrounding embryonic envelopes, is ingested by a suitable host, the hexacanth emerges from the envelopes, penetrates host tissues, and begins metamorphosis into the juvenile metacestode stage (Jarecka 1975, Ubelaker 1980, 1983, Conn 2004c, Świderski 2007.…”

mentioning

confidence: 99%

A standardised terminology of the embryonic envelopes and associated developmental stages of tapeworms (Platyhelminthes: Cestoda)

Conn

Świderski²

2008

FOLIA PARASIT

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Abstract. Over the past 40 years, much has been published on the ultrastructure and cellular development of embryonic structures in a wide range of cestodes. However, the literature contains many discrepancies in both terminology and interpretations because of the facts that these organisms are phylogenetically diverse within their respective orders and families, the habitats that affect embryonic envelope structure are diverse, and the work has been done in various laboratories around the world. This review and synthesis was initiated by a working group of biologists from around the world convened at the Fifth International Workshop on Cestode Systematics and Phylogeny in České Budĕjovice, at the Institute of Parasitology of the Biology Centre, Academy of Sciences of the Czech Republic. It brings together the data from published work and establishes a uniform terminology and interpretation based on the data as they are presented. A consensus was reached for standardised definitions of the oncosphere, hexacanth, coracidium, embryonic envelopes, outer envelope, inner envelope, embryophore, vitelline capsule, shell, and outer coat. All of these are defined as components of the embryo or its vitellocyte-derived or uterine-derived coatings.

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Structure and Ultrastructure of the Larvae and Metacestodes of Hymenolepis Diminuta

Cited by 25 publications

References 83 publications

Sensory receptors and surface ultrastructure of trypanorhynch cestodes

Sensory receptors and surface ultrastructure of trypanorhynch cestodes

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

A standardised terminology of the embryonic envelopes and associated developmental stages of tapeworms (Platyhelminthes: Cestoda)

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