Phylogenetic Relationships of Rotifers, as Derived from Photoreceptor Morphology and Other Ultrastructural Analyses

Clément, Pierre

doi:10.1007/978-94-009-9209-2_18

Cited by 24 publications

(47 citation statements)

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“…Specifically, the ultrastructural investigations of Eakin and Westfall (1965), Clément (1975Clément ( , 1977Clément ( , 1980Clément ( , 1987, Amsellem (1986, 1989), Clément and Wurdak (1984), Clément et al (1980Clément et al ( , 1983, and Wurdak et al (1983) provided details on the structure and innervation of sensory receptors, muscles and the coronal cilia. However, the only detailed studies on the structure of the cerebral ganglion are those of Clément (1975) on Trichocerca and the dissertations of Ware (1971) and Seldon (1972) on Asplanchna brightwellii.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional reconstruction and neural map of the serotonergic brain of Asplanchna brightwellii (Rotifera, Monogononta)

Hochberg

2008

Journal of Morphology

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The basic organization of the rotifer brain has been known for nearly a century; yet, fine details on its structure and organization remain limited despite the importance of rotifers in studies of evolution and population biology. To gain insight into the structure of the rotifer brain, and provide a foundation for future neurophysiologic and neurophylogenetic research, the brain of Asplanchna brightwellii was studied with immunohistochemistry, confocal laser scanning microscopy, and computer modeling. A three-dimensional map of serotonergic connections reveals a complex network of approximately 28 mostly unipolar, cerebral perikarya and associated neurites. Cells and their projections display symmetry in quantity, size, connections, and pathways between cerebral hemispheres within and among individuals. Most immunopositive cells are distributed close to the brain midline. Three pairs of neurites form decussations at the brain midline and may innervate sensory receptors in the corona. A single neuronal pathway appears to connect both the lateral horns and dorsolateral apical receptors, suggesting that convergence of synaptic connections may be common in the afferent sensory systems of rotifers. Results show that the neural map of A. brightwellii is much more intricate than that of other monogonont rotifers; nevertheless, the consistency in neural circuits provides opportunities to identify homologous neurons, distinguish functional regions based on neurotransmitter phenotype, and explore new avenues of neurophylogeny in Rotifera.

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Section: Introductionmentioning

confidence: 99%

Three‐dimensional reconstruction and neural map of the serotonergic brain of Asplanchna brightwellii (Rotifera, Monogononta)

Hochberg

2008

Journal of Morphology

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“…The problem of the origin of the rotiferan pseudocoel, including explanations of a possible evolution of the Pseudocoelomata from regressed coelomie worms has been discussed often (see e.g ., Remane, 1963 ;Ruttner-Kolisko, 1963 ;Clement, 1980Clement, ,1985Starobogatov, 1983) . However, in my opinion, this issue is not of prime importance .…”

Section: Discussion Of the Issues Pseudocoelmentioning

confidence: 99%

“…Many scientists have discussed the morphology of the mastax, ciliated corona, organ systems, and ultrastructural organization of rotiferan tissues (e .g ., Hyman, 1951 ;Remane, 1963 ;Clement, 1980Clement, , 1985Lorenzen, 1985 ;Wallace & Colburn, 1989 ;Markevich, 1990b). The principle problems enunciated by these and other authors 521 regarding the phylogeny of rotifers may be summarized as follows .…”

Section: Introductionmentioning

confidence: 99%

Phylogenetic relationships of Rotifera to other veriform taxa

Markevich

1993

Hydrobiologia

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Arguments concerning similarities in general structure and embryogenesis in Bdelloida (Rotifera), Platyhelminthes, and Acanthocephala are considered . Evolution of egg hatching in rotifers (i .e ., loss of the embryonic egg shell) is evaluated in relation to the phylogenetic similarity of rotifers to the Neodermata . Based on this analysis, I proposed uniting Rotifera and Neodermata into superphylum Squamodermata .

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“…Classically, rotifer phylogeny has been based primarily on morphological features (for example, Clement, 1980) . Epp & Lewis (1979), Kutikova (1983), and Wallace & Colburn (1989) derived phylogenies for rotifers that incorporate ecology as well as morphology .…”

Section: Discussionmentioning

confidence: 99%

Analysis of rotifer ribosomal gene structure using the polymerase chain reaction (PCR)

Walsh

Starkweather

1993

Hydrobiologia

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We have used the polymerase chain reaction (PCR) to selectively amplify 18S ribosomal genes in rotifer taxa from major planktonic clades . In each case, we obtained an amplified product of between 1 .8 and 2 .0 kilobase pairs . We analyzed the PCR products using 6-and 4-base cutting restriction enzymes, comparing fragment mobilities . For example, Brachionus plicatilis (BSL strain) 18S genes have no restriction sites for Hind III or Bam HI and only a single site for Eco RI (all 6-base cutters) . The 4-base cutter Msp I, on the other hand, has at least 4 enzymatic sites, producing fragments between approximately 110 and 460 base pairs in length . Results of this type can be used to differentiate among species and species groups within the Rotifera and can be used as the basis for construction of a broad molecular phylogeny of the group .

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Phylogenetic Relationships of Rotifers, as Derived from Photoreceptor Morphology and Other Ultrastructural Analyses

Cited by 24 publications

References 50 publications

Three‐dimensional reconstruction and neural map of the serotonergic brain of Asplanchna brightwellii (Rotifera, Monogononta)

Three‐dimensional reconstruction and neural map of the serotonergic brain of Asplanchna brightwellii (Rotifera, Monogononta)

Phylogenetic relationships of Rotifera to other veriform taxa

Analysis of rotifer ribosomal gene structure using the polymerase chain reaction (PCR)

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