Stomatogenesis and morphological re-description of the marine ciliate,Philasterides armatalis(Protozoa: Ciliophora: Scuticociliatida)

The stomatogenesis and morphology of the marine planktonic ciliatePhilasterides armataliscollected from mollusc-culturing waters off the coast of Qingdao, China, were studied using a differential interference contrast microscope for observationsin vivoand protargol impregnation. In terms of its infraciliature, this species possesses typical characteristics of the genusPhilasterides: bipartite paroral membrane, the anterior part double-rowed and the posterior part in a zig-zag-formation, and three well-defined membranelles arranged inParanophrys-pattern. This investigation confirms the dual origin of the buccal apparatus in the opisthe, one derived from the scutica and the other from the paroral membrane. Its stomatogenesis belongs to the ‘Philasterides’ sub-type, although it differs from its only congenerP. armata, in that paroral membrane 1 gives rise to the paroral membrane and the scutica in the proter, and paroral membrane 2 forms the paroral membrane, membranelles 1 and 2 and the scutica in the opisthe. Based on stomatogenetic data, the phylogenetic positions of several genera in the suborder Philasterina are reconsidered.

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Redescription of the marine scuticociliate Glauconema trihymene Thompson, 1966 (Protozoa: Ciliophora): life cycle and stomatogenesis

Zootaxa ◽

10.11646/zootaxa.1296.1.1 ◽

2006 ◽

Vol 1296 (1) ◽

pp. 1 ◽

Cited By ~ 5

Author(s):

HONGWEI MA ◽

WEI B. SONG ◽

ALAN WARREN ◽

DAVID ROBERTS ◽

JUN GONG ◽

...

Keyword(s):

Life Cycle ◽

Silver Nitrate ◽

Major Part ◽

Anterior Part ◽

Posterior Part ◽

Junior Synonym ◽

Marine Ciliate ◽

Frontal Plate ◽

Protozoa Ciliophora

The transformation from trophont to tomite, morphology, and stomatogenesis during asexual division of the marine ciliate Glauconema trihymene Thompson, 1966 were studied using protargol and Chatton–Lwoff silver nitrate impregnation. An improved diagnosis for the genus Glauconema is suggested: Parauronematidae with polymorphic life cycle comprising trophont, tomite and cyst: buccal apparatus dimorphic, membranelles 1 and 2 closely opposed in trophont while well separated in tomite; paroral membrane uniform, extending anteriorly to midway of membranelle 2; single caudal cilium present; conspicuous glabrous frontal plate. Morphological redescription and stomatogenetic studies were made for G. trihymene. Stomatogenesis in G. trihymene is characterized by: paroral membrane and scutica in the opisthe originate from the anterior part of the parental paroral membrane; membranelles 1 and 2 in the opisthe derive from the posterior part of the parental paroral membrane; the major part of the proliferated scutica develops into membranelle 3 with only a small part comprising several kinetosomes joining in the formation of membranelle 2. Several stages of the transformation from trophont to tomite were also observed. This process starts from an anarchic field, which originates from the whole parental paroral membrane. These develop into two primordia that generate the paroral membrane and three new membranelles, respectively. The three parental membranelles are resorbed or join in the formation of the new membranelles, while the scutica is retained and does not take part in the transformation. The genus Urocryptum Pérez-Uz & Guinea, 2001 is considered a junior synonym of Glauconema and U. tortum is hence transferred to the genus Glauconema as G. tortum (Maupas, 1883) nov. comb.

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Stomatogenesis of the marine ciliate Paranophrys magna (Protozoa: Ciliophora: Scuticociliatida) from Qingdao, China

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315401003988 ◽

2001 ◽

Vol 81 (3) ◽

pp. 377-382 ◽

Cited By ~ 5

Author(s):

Hongwei Ma ◽

Weibo Song ◽

Xiaozhong Hu

Keyword(s):

Main Sequence ◽

Anterior Part ◽

Posterior Part ◽

Marine Ciliate ◽

Protozoa Ciliophora

The morphology and stomatogenesis of the marine scuticociliate Paranophrys magna, collected from a crab-culturing pond in Qingdao, China, were studied. It possessed typical characteristics of the genus Paranophrys. The stomatogenesis of this species corresponds basically with the results provided in previous studies for this genus, the main sequence develops can be generalized as follows according to the Qingdao population: (i) in the proter: the remnant of the parental paroral membrane generates the new paroral membrane and the scutica; and (ii) in the opisthe: both the paroral membrane and scutica originate from the proliferation of the anterior part of the secondary primordial field, membranelles 1&2 derive from the posterior part of the secondary primordial field, while membranelle 3 from the proliferation of the parental scutica which form the primary primordial field. Some differences between our results and previous descriptions are compared and discussed.

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