The implications of recent descriptions of kinetid structure to the systematics of the ciliated protists

Lynn, D. H.

doi:10.1007/978-3-7091-6714-4_11

Cited by 18 publications

(15 citation statements)

References 63 publications

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“…8.2.a), however, Lynn did not depict isolated transverse microtubules (T2 and TD), which might be present in other metopids (Esteban et al 1995a,b;Lynn 2008;Silva-Neto in Tuffrau and de Puytorac 1994). While microtubules homologous to TD occur in somatic kinetids of various other ciliates (for a revision, see Lynn 2008), T2 are supposedly an apomorphy of litostomatean monokinetids (Lynn 1991(Lynn , 2008Williams et al 1981). Those microtubules are also present in clevelandellids Nyctotherus and Sicuophora (King et al 1961;Paulin 1967;Puytorac and Grain 1969), but also in some heterotrichs (e.g.…”

Section: Discussionmentioning

confidence: 99%

Fine Structure and Molecular Phylogeny of Parametopidium circumlabens (Ciliophora: Armophorea), Endocommensal of Sea Urchins

Silva‐Neto

Paiva

Borges

et al. 2015

J Eukaryotic Microbiology

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Metopid armophoreans are ciliates commonly found in anaerobic environments worldwide; however, very little is known of their fine structure. In this study, the metopid Parametopidium circumlabens (Biggar and Wenrich 1932) Aescht, 1980, a common endocommensal of sea urchins, is investigated for the first time with emphasis on transmission electron microscopy, revealing several previously unknown elements of its morphology. Somatic dikinetids of P. circumlabens have a typical ribbon of transverse microtubules, an isolated microtubule near triplets 4 and 5 of the anterior kinetosome, plus two other microtubules between anterior and posterior kinetosomes, a short kinetodesmal striated fiber and long postciliary microtubules. In the dikinetids of the perizonal stripe, the kinetodesmal fiber is very pronounced, and there is a conspicuous microfibrillar network system associated with the kinetosomes. A new structure, shaped as a dense, roughly cylindrical mass surrounded by microtubules, is found associated with the posterior kinetosome of perizonal dikinetids. The paroral membrane is diplostichomonad and the adoral membranelles are of the "paramembranelle" type. Bayesian inference and maximum-likelihood analysis of the 18S-rDNA gene unambiguously placed P. circumlabens as sister group of the cluster formed by ((Atopospira galeata, Atopospira violacea) Metopus laminarius) + Clevelandellida, corroborating its classification within the Metopida.

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Section: Discussionmentioning

confidence: 99%

Fine Structure and Molecular Phylogeny of Parametopidium circumlabens (Ciliophora: Armophorea), Endocommensal of Sea Urchins

Silva‐Neto

Paiva

Borges

et al. 2015

J Eukaryotic Microbiology

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“…Normal somatic cilia 10 p, m long, those of perizonal stripe and underneath buccal vertex elongated to 13 pm. Invariably about four to six caudal cilia, whose length varies considerably in different populations: as long as body [46], about 30 pm [19], 35 pm in live specimens from a riparian forest soil in Lower Austria, 30-45 pm (a = 38.8 pm, n = 10) in protargolimpregnated cells from Namibia, and 30-76 pm (f = 50 pm, n = 19) in protargol-impregnated specimens from South Africa. Number of ciliary rows rather variable, about 15 in type population (as estimated from Fig.…”

Section: Methodsmentioning

confidence: 99%

Morphology and Morphogenesis of Metopus hasei Sondheim, 1929 and M. inversus (Jankowski, 1964) nov. comb. (Ciliophora, Metopida)

Foissner

1999

J Eukaryotic Microbiology

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The morphology and morphogenesis of Metopus hasei Sondheim, 1929 and M. inversus (Jankowski, 1964) n. comb, were investigated using live observation, silver impregnation, and scanning electron microscopy. Metopus has a spiral body organization and the ventral margin of the preoral dome bears five specialized ciliary rows, that form the so‐called perizonal stripe. Division is homothetogenic, occurs in freely motile (i. e. non‐encysted) condition, and includes a partial reorganization of the parental oral apparatus. During division, the complicated cell shape becomes ellipsoidal and all ciliary rows arrange meridionally. Stomatogenesis is entirely somatic (≅ pleurotelokinetal) and commences with the formation of kinetofragments in some dorsolateral kineties. The fragments become the opisthe's adoral membranelles, while the paroral membrane is generated by the left two perizonal ciliary rows, which proliferate kinetids intrakinetally. The perizonal stripe of the opisthe is generated by the three right parental perizonal kineties, which divide, and by two dorsolateral ciliary rows, which are added. The morphogenetic processes, especially the unique mode of formation of the paroral membrane, are used to define the order Metopida Jankowski, 1980 n. stat. more properly. The ontogenetic, ultrastructural, and sequence data available give no clear indication about metopid phylogeny, but definitely exclude metopids from the classical heterotrichs, with which they were classified for more than 100 years. Accordingly, we place the Metopida as incertae sedis in the subphylum Intramac‐ronucleata Lynn, 1996.

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“…Jacques hooked me on the ciliates that summer with his sense of humour, his encyclopaedic knowledge of general biology, and his professorial stand on a number of issues. I began my doctoral work in his laboratory I Past-President's Address, delivered at the 48th Annual Meeting of the Society of Protozoologists, University of Alabama, Tuscaloosa, July 30,1995 John Corliss, of course, is the North American "grandfather" of systematic ciliatology. His systematic work culminating in his 196 1 book The Ciliated Protozoa: Characterization, Classification, and Guide to the Literature [9] established and formalized the systematic vision of FaurbFremiet and provided me with a monumental professional role model.…”

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confidence: 99%

My Journey in Ciliate Systematics1

LYNN

1996

J Eukaryotic Microbiology

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The implications of recent descriptions of kinetid structure to the systematics of the ciliated protists

Cited by 18 publications

References 63 publications

Fine Structure and Molecular Phylogeny of Parametopidium circumlabens (Ciliophora: Armophorea), Endocommensal of Sea Urchins

Fine Structure and Molecular Phylogeny of Parametopidium circumlabens (Ciliophora: Armophorea), Endocommensal of Sea Urchins

Morphology and Morphogenesis of Metopus hasei Sondheim, 1929 and M. inversus (Jankowski, 1964) nov. comb. (Ciliophora, Metopida)

My Journey in Ciliate Systematics1

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