Capsular Protonephridia in Male Oligacanthorhynchus atrata (Acanthocephala)

Dunagan, T. T.; Rashed, Rowaida

doi:10.2307/3282495

Cited by 21 publications

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“…Morphology and overall organization of uterus and vagina appear to vary little within the Acanthocephala. For example, in P. ambiguus , O. atrata and M. moniliformis the uterus consistently was found to be a tubelike muscular syncytium with two nuclei, and the vagina is always described as being composed of three concentric syncytia (binucleate outer and inner sphincter, epithelium mostly with four nuclei) (see Asaolu 1980; Dunagan and Rashed 1988; present study). Corresponding numbers of uterine and vaginal nuclei can also be found in the descriptions of other acanthocephalan species, that are representatives of the Echinorhynchus ‐group (see Hamann 1891; Kilian 1932; Meyer 1933; Whitfield 1968).…”

Section: Discussionmentioning

confidence: 51%

Ultrastructure and overall organization of ligament sac, uterine bell, uterus and vagina in Paratenuisentis ambiguus (Acanthocephala, Eoacanthocephala) – the character evolution within the Acanthocephala

Herlyn

Röhrig

2003

Acta Zoologica

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As an adaptation to their endoparasitic lifestyle, Acanthocephala (Palaeacanthocephala, Eoacanthocephala, Polyacanthocephala, Archiacanthocephala) have evolved a highly specialized reproductive system. Most of our present knowledge of the efferent duct system of the female is based on palaeacanthocephalan and archiacanthocephalan representatives. In order to provide a basis for further elucidating the phylogenetic relationships within the Acanthocephala, we herein describe ultrastructure and overall organization of the ligament sac and efferent duct system in females of Paratenuisentis ambiguus (Eoacanthocephala, Neoechinorhynchida). Only one ligament sac was found. The uterine bell consists of two contractile binucleate syncytia (bell wall syncytium, lateral pocket syncytium), two pairs of contractile cells (lappet cells, uterine bell retractors) and three pairs of noncontractile cells (median cells). The contractile uterus bears four nuclei. The vagina is composed of a syncytial epithelium (four nuclei) and two binucleate sphincters. A comparison of the present findings with literature data leads to the following conclusions: except for the uterine bell retractors, the uterine bell components found in P. ambiguus can be assumed to be autapomorphies for the Acanthocephala. The sheathing syncytium and median dorsal cell belong to the basal pattern (sensu ground pattern) of a palaeacanthocephalan subclade termed the Echinorhynchus‐group in the present study. The median oviduct syncytium and paired uterine bell retractors can be assumed to be basal pattern characteristics of the Archiacanthocephala and Neoechinorhynchida, respectively. The study includes a tabular survey of terminological synonyms used in the literature.

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Section: Discussionmentioning

confidence: 51%

Ultrastructure and overall organization of ligament sac, uterine bell, uterus and vagina in Paratenuisentis ambiguus (Acanthocephala, Eoacanthocephala) – the character evolution within the Acanthocephala

Herlyn

Röhrig

2003

Acta Zoologica

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Acanthocephala inThe Journal of Parasitology, 1914–2014

Amin¹

2016

A Century of Parasitology

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The Evolution of Organ Systems

Schmidt‐Rhaesa

2007

218

243

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The field of systematics has developed remarkably over the last few decades. A multitude of new methods and contributions from diverse biological fields — including molecular genetics and developmental biology — have provided a wealth of phylogenetic hypotheses, some confirming traditional views and others contradicting them. There is now sufficient evidence to draw up a ‘tree of life’ based on fairly robust phylogenetic relationships. This book aims to apply these new phylogenies to an evolutionary interpretation of animal organ systems and body architecture. Organs do not appear suddenly during evolution: instead they are composed of far simpler structures. In some cases, it is even possible to trace particular molecules or physiological pathways as far back as pre-animal history. What emerges is a fascinating picture, showing how animals have combined ancestral and new elements in novel ways to form constantly changing responses to environmental requirements. The book starts with a general overview of animal systematics to set the framework for the discussion of organ system evolution. The chapters deal with the general organization, integument, musculature, nervous system, sensory structures, body cavities, excretory, respiratory and circulatory organs, the intestinal and reproductive system, and spermatozoa. Each organ system is presented with its function, the diversity of forms that are realized among metazoan animals, and the reconstruction of its evolution.

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Capsular Protonephridia in Male Oligacanthorhynchus atrata (Acanthocephala)

Cited by 21 publications

References 0 publications

Ultrastructure and overall organization of ligament sac, uterine bell, uterus and vagina in Paratenuisentis ambiguus (Acanthocephala, Eoacanthocephala) – the character evolution within the Acanthocephala

Ultrastructure and overall organization of ligament sac, uterine bell, uterus and vagina in Paratenuisentis ambiguus (Acanthocephala, Eoacanthocephala) – the character evolution within the Acanthocephala

Acanthocephala inThe Journal of Parasitology, 1914–2014

The Evolution of Organ Systems

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