Subclass Aspidogastrea Faust &amp; Tang, 1936.

Rohde, Katrin S.; Gibson, David I.; Jones, A.; Bray, R. A.

doi:10.1079/9780851995472.0005

Cited by 23 publications

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“…The Aspidogastrea and Digenea are generally considered to represent subclasses of the class Trematoda (Skryabin 1952;Baer and Joyeux 1961;Gibson and Chinabut 1984;Gibson 1987Gibson , 2002aRohde et al 1995;Rohde 2001Rohde , 2002. However, the generally accepted position of the Aspidogastrea within the class Trematoda has been questioned.…”

Section: Introductionmentioning

confidence: 99%

Ultrastructural characteristics of the uterine epithelium of aspidogastrean and digenean trematodes

Poddubnaya

Levron

Gibson

2011

Acta Parasitologica

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The ultrastructure of the uterus proper of the aspidogastrean Aspidogaster limacoides Diesing, 1835 and two digenean species, Phyllodistomum angulatum Linstow, 1907 (Plagiorchiida, Gorgoderidae) and Azygia lucii (Müller, 1776) (Strigeida, Azygiidae), was examined by transmission electron microscopy (TEM). The uterine epithelial lining of these species is thin, except for the perinuclear region of the epithelial cells. Septate junctions occur between adjacent epithelial cells within the uterine wall. The luminal surface of the cells is elevated into microlamellae, which project into the uterine lumen and cover the entire epithelial lining. Basally the uterine epithelium is attached to a basal matrix, and its supporting layers of muscle fibres are weak and composed of scattered circular muscles. Despite the marked similarity in the ultrastructural pattern of the aspidogastrean and two digeneans studied, there is some degree of variation in the secretory activity of their uterine epithelium. The high level of vesicular exocytotic activity in the epithelial cytoplasm of A. lucii may be associated with differences in egg emission and the subsequent life cycle involving a non-ciliated, non-swimming and non-free-living miracidium, as opposed to the free-swimming miracidium of P. angulatum. The similar nature of the uterine epithelium in all three species studied represents an ultrastructural marker possibly supporting a close phylogenetic relationship between the Aspidogastrea and the Digenea.

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Section: Introductionmentioning

confidence: 99%

Ultrastructural characteristics of the uterine epithelium of aspidogastrean and digenean trematodes

Poddubnaya

Levron

Gibson

2011

Acta Parasitologica

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“…All of the species whose life-cycle is known use a mollusc as an obligate host and, in most cases, a lower vertebrate as a facultative or obligate final host (Rohde 1972(Rohde , 1994(Rohde , 2001(Rohde , 2002Gibson 1987). Parthenogenetic generations (asexual larval multiplication), such as occur in the Digenea, are absent in known life-cycles of aspidogastreans.…”

Section: Introductionmentioning

confidence: 99%

“…This group has retained some archaic characters of the hypothetical proto-trematodes (Rohde 1972(Rohde , 1994(Rohde , 2001(Rohde , 2002Gibson 1987) and has been considered to comprise two orders, four families, 12 genera and only about 80 species (Gibson and Chinabut 1984, Rohde 2001, although some doubt concerning the higher level classification has been expressed following a limited molecular study (Chen et al 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Rohde (1972Rohde ( , 2001, in his major reviews of the biology and relationships of the Aspidogastrea, has considered that a closer examination of this group may shed more light on its phylogenetic affiliations with other platyhelminth groups. According to this author (Rohde 2001(Rohde , 2002, the more complex life-history patterns of the Digenea likely evolved from the simple life-cycle of the aspidogastreans.…”

Section: Introductionmentioning

confidence: 99%

“…The cotylocidium differs from the digenean larva, the miracidium, which develops within the egg, in that it possesses the fundamental organisation of the adult form and thus more closely resembles the digenean metacercaria, i.e. the cotylocidium develops directly into an adult, either in the same host or in another individual of the same or a different species (Rohde 1972(Rohde , 1994(Rohde , 2002Świder-ski et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Advanced stages of embryonic development and cotylocidial morphogenesis in the intrauterine eggs of Aspidogaster limacoides Diesing, 1835 (Aspidogastrea), with comments on their phylogenetic implications

Świderski

Poddubnaya

Gibson

et al. 2012

Acta Parasitologica

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Ultrastructural aspects of the advanced embryonic development and cotylocidial morphogenesis of the aspidogastrean Aspidogaster limacoides are described. The posterior or distal regions of the uterus are filled with eggs containing larvae at advanced stages of morphogenesis and fully-formed cotylocidia. Various stages and organs of this larva are described in detail, including the aspects of the developing and fully-differentiated cotylocidium, the body wall (tegument and musculature), glandular regions and the protonephridial excretory system. Blastomere multiplication by means of mitotic divisions takes place simultaneously with the degeneration or apoptosis of some micromeres; this frequently observed characteristic is compared and discussed in relation to corresponding reports for other neodermatans. During the advanced stages of the embryonic development of A. limacoides, the vitelline syncytium disappears and the size of the embryo increases rapidly. Evident polarization of the differentiating larva was observed; towards one pole of the egg, cytodifferentiation of the mouth, surrounded by the oral sucker and cephalic glands, takes place, whereas, towards the opposite pole, differentiation of the posterior sucker (incipient ventral disc) occurs. The oral and posterior suckers are formed from numerous embryonic cells which have differentiated into myocytes. The central part of the oral sucker undergoes invagination and forms the future pharynx and intestine. Fully-developed cotylocidia of A. limacoides have a neodermatan type of tegument, flame cells and two types of glandular structures. These results suggest a sister relationship between the Aspidogastrea and the Digenea, although the systematic position of aspidogastreans in relation to other platyhelminth taxa remains somewhat equivocal.

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Biology of Trematodes and Leeches

Baker¹

2007

Flynn's Parasites of Laboratory Animals

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Subclass Aspidogastrea Faust & Tang, 1936.

Abstract: This chapter discusses the identification of the subclass Aspidogastrea and provides keys to its families (Aspidogasteridae, Multicalycidae, Rugogastridae, Stichocotylidae) and subfamilies (Aspidogasterinae, Cotylaspidinae, Rohdellinae).

Cited by 23 publications

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Ultrastructural characteristics of the uterine epithelium of aspidogastrean and digenean trematodes

Ultrastructural characteristics of the uterine epithelium of aspidogastrean and digenean trematodes

Advanced stages of embryonic development and cotylocidial morphogenesis in the intrauterine eggs of Aspidogaster limacoides Diesing, 1835 (Aspidogastrea), with comments on their phylogenetic implications

Biology of Trematodes and Leeches

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