Secretory end-feet, extracerebral cells, and cerebral sense organs in certain limicole oligochaete annelids

Golding, D. W.; Whittle, A.C.

doi:10.1016/0040-8166(75)90019-1

Cited by 17 publications

(7 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6A-E). This feature is not present in Tubificidae and Lumbriculidae, where a 9×2+2 axoneme was found (Golding and Whittle 1975). 6C, E).…”

Section: Re-evaluation Of Characters Shared By H Periglandulata and mentioning

confidence: 90%

“…This feature is not present in Tubificidae and Lumbriculidae, where a 9×2+2 axoneme was found (Golding and Whittle 1975). 64 bificidae (including Naididae), Lumbriculidae and Enchytraeidae (Golding and Whittle 1975;Basmer and Greven 1993;Rota et al 1999;Locke 2000). In most species the sensory cells bear only a few, normally branched cilia, with the exception of species of Protodriloides Jouin, 1966 and Aeolosoma hemprichi Ehrenberg, 1828 (see Purschke and Müller 1996;Hessling and Purschke 2000).…”

Section: Re-evaluation Of Characters Shared By H Periglandulata and mentioning

confidence: 99%

“…In most species the sensory cells bear only a few, normally branched cilia, with the exception of species of Protodriloides Jouin, 1966 and Aeolosoma hemprichi Ehrenberg, 1828 (see Purschke and Müller 1996;Hessling and Purschke 2000). These organs appear to be structurally uniform and although first reported not to be associated with supporting cells (Golding and Whittle 1975;Basmer and Greven 1993), a glial cell connected to the sensory A Two sense organs (arrows) in the dorsal part of the brain. 64 bificidae (including Naididae), Lumbriculidae and Enchytraeidae (Golding and Whittle 1975;Basmer and Greven 1993;Rota et al 1999;Locke 2000).…”

Section: Re-evaluation Of Characters Shared By H Periglandulata and mentioning

confidence: 99%

See 2 more Smart Citations

Is Hrabeiella periglandulata (Annelida, "Polychaeta") the sister group of Clitellata? Evidence from an ultrastructural analysis of the dorsal pharynx in H. periglandulata and Enchytraeus minutus (Annelida, Clitellata)

Purschke

2002

Zoomorphology

View full text Add to dashboard Cite

The terrestrial polychaete species Hrabeiella periglandulata has many characters in common with Clitellata and with Parergodrilidae, the latter representing another taxon of "Polychaeta" comprising a terrestrial species. Absence of a typical clitellum, different structure and position of the genital organs, different ultrastructure of the spermatozoa and chaetae as well as the presence of nuchal organs, although internal and highly modified, precluded inclusion of H. periglandulata within Clitellata. Consequently, convergent evolution of the clitellate-like features in these groups due to similar selection pressure was generally assumed. Similarities between H. periglandulata and Clitellata are greater than between both of these and Parergodrilidae and include not only reductions and absences but comparatively complex structures as well, among them the dorsally positioned pharynx, so far only known for Clitellata. However, the possibility of homology and thus synapomorphy between Hrabeiella and Clitellata has never seriously been discussed, a view seemingly supported by molecular data. In the present study an ultrastructural investigation of the dorsal pharynx was undertaken in H. periglandulata and in the clitellate species Enchytraeus minutus. The structures in common include a dense ciliation of the dorsal epithelium with short and immobile cilia, a prominent rootlet system which is connected to the musculature, numerous openings of pharyngeal gland cells between the ciliated cells, a cuticular fold surrounding the cilia, an unciliated buccal cavity, and cell bodies of the pharyngeal glands situated outside the pharyngeal epithelium. This makes the general assumption of convergence at least questionable. Likelihood of homology of this type of pharynx is further supported by the corresponding structure of cerebral sense organs and the cen-tral nervous system. Thus, these characters may likewise and more parsimoniously be explained as synapomorphies, making a sister group relationship of H. periglandulata and Clitellata conceivable.

show abstract

“…6A-E). This feature is not present in Tubificidae and Lumbriculidae, where a 9×2+2 axoneme was found (Golding and Whittle 1975). 6C, E).…”

Section: Re-evaluation Of Characters Shared By H Periglandulata and mentioning

confidence: 90%

Section: Re-evaluation Of Characters Shared By H Periglandulata and mentioning

confidence: 99%

Section: Re-evaluation Of Characters Shared By H Periglandulata and mentioning

confidence: 99%

See 1 more Smart Citation

Is Hrabeiella periglandulata (Annelida, "Polychaeta") the sister group of Clitellata? Evidence from an ultrastructural analysis of the dorsal pharynx in H. periglandulata and Enchytraeus minutus (Annelida, Clitellata)

Purschke

2002

Zoomorphology

View full text Add to dashboard Cite

show abstract

“…Whereas photoreception is generally accepted if such sensory cells occur together with cells containing shading pigment, the function of these structures which are not associated with shading pigment is still uncertain since no convincing experimental evi-dence for their function exists. Besides light-sensitivity, functions such as chemoreception, including control of neurosecretory activity as well as osmoregulation, and detection of changes in hydrostatic pressure have been suggested for such organs (Zahid & Golding 1974;Golding & Whittle 1975;Rhode 1991). The sensory structures of P. taenioides are enclosed in intra-or extracellular cavities which are not continuous with either the external medium, the interstitium or the blood and so light-sensitivity seems more probable than chemoreception or hydrodynamics.…”

Section: Discussionmentioning

confidence: 99%

Ultrastructure of Presumed Ocelli in Parenterodrilus taenioides (Polychaeta, Protodrilidae) and their Phylogenetic Significance

Purschke

Jouin-Toulmond

1993

Acta Zoologica

View full text Add to dashboard Cite

Three different types of presumed unpigmented ocelli have been found in the anterior end of Parenterodrilus taenioides, a small gutless interstitial polychaete. The type‐1 ocelli are located in the palps and four ocelli have been found along the length of each palp. The type‐2 and type‐3 ocelli lie close together in the head segment and are located in posterior ganglionic expansions of the brain. There is one pair of the minute type‐2 ocelli but at least two pairs of the type‐3 organs, which are the largest ocelli. In each ocellus the sensory cells are of the ciliary type and possess two cilia whose plasma membranes branch into numerous microvilli. With the exception of the type‐1 ocelli they consist of a sensory cell and a supportive cell. In each ocellus the supportive cell forms a thin cup‐shaped envelope around the densely packed ciliary branches. The type‐1 ocelli consist of a single cell forming an intracellular vacuole (phaosome) which contains less densely packed microvillus‐like structures. In particular, the structure of these ocelli is compared with that in other polychaetes, with special emphasis on the remaining genera of the Protodrilida.

show abstract

“…In the Clitellata these structures are always closely associated with the brain. They have so far been reported in species of the Naididae, Tubificidae and Enchytraeidae (Golding and Whittle 1975;Basmer and Greven 1993). In the species investigated they appear structurally uniform: between two and twelve sensory cells, each bearing numerous cilia that project into a cavity partly bordered by glial cells.…”

Section: Ciliary Sense Organs and Sensory Cellsmentioning

confidence: 94%

Immunohistochemical (cLSM) and ultrastructural analysis of the central nervous system and sense organs in Aeolosoma hemprichi (Annelida, Aeolosomatidae)

Hessling¹,

Purschke²

2000

Zoomorphology

View full text Add to dashboard Cite

The Aeolosomatidae are very small limnetic or terrestrial annelids of apparently simple organisation and uncertain phylogenetic position. They have been placed either at the base of the Clitellata, as a highly derived taxon within the Clitellata closely related to the Naididae, or as their sister group within the "Polychaeta". A combined immunohistochemical (cLSM) and ultrastructural investigation of the central nervous system and the sense organs in Aeolosoma hemprichi was undertaken to look for characters which might support one of these theories. The position of the brain within the prostomium and the organisation of the ventral nerve cord, with its intraepithelial paired longitudinal nerves lying far apart from each other and the presence of a median longitudinal nerve, are atypical for the Clitellata and clearly differ from the situation found in Naididae. Moreover, the circumoesophageal connectives are bifurcated and enter the brain as dorsal and ventral roots; this arrangement is unknown in Clitellata, in which these connectives are unbranched. An ultrastructural analysis of the ciliated pits located laterally in the furrow between prostomium and peristomium in A. hemprichi and other Aeolosomatidae show that they are in fact nuchal organs. Such presumed chemosensory organs are typical of "Polychaeta" and absent in all Clitellata. Two pairs of ciliary sense organs are present in the prostomium in front of the brain of A. hemprichi. Although similarly organised sensory structures occur in many species of the Clitellata, they differ in position and certain ultrastructural features and are known from other Annelida as well. These results clearly support the exclusion of the Aeolosomatidae from the Clitellata and do not provide any evidence for a sister-group relationship between these two taxa.

show abstract

Secretory end-feet, extracerebral cells, and cerebral sense organs in certain limicole oligochaete annelids

Cited by 17 publications

References 31 publications

Is Hrabeiella periglandulata (Annelida, "Polychaeta") the sister group of Clitellata? Evidence from an ultrastructural analysis of the dorsal pharynx in H. periglandulata and Enchytraeus minutus (Annelida, Clitellata)

Is Hrabeiella periglandulata (Annelida, "Polychaeta") the sister group of Clitellata? Evidence from an ultrastructural analysis of the dorsal pharynx in H. periglandulata and Enchytraeus minutus (Annelida, Clitellata)

Ultrastructure of Presumed Ocelli in Parenterodrilus taenioides (Polychaeta, Protodrilidae) and their Phylogenetic Significance

Immunohistochemical (cLSM) and ultrastructural analysis of the central nervous system and sense organs in Aeolosoma hemprichi (Annelida, Aeolosomatidae)

Contact Info

Product

Resources

About