Observations on Morphogenesis in a marine ciliate Tachysoma ovata (Protozoa: Ciliophora: Hypotrichida)

1999 ◽  
Vol 79 (1) ◽  
pp. 35-38 ◽  
Author(s):  
Weibo Song ◽  
Alan Warren
Keyword(s):  
Cell Division ◽  
Anterior Part ◽  
Marine Ciliate ◽  
Protozoa Ciliophora ◽  
Left And Right ◽  
Definite Period

Divisional morphogenesis of the marine hypotrichous ciliate, Tachysoma ovata was investigated based on protargol impregnated specimens. Its morphogenesis reveals the following peculiarities: (1) there is a definite period during which the anterior part of the newly formed adoral zone of membranelles (AZM) in the opisthe connects with the parental AZM which remains unchanged during the morphogenesis. (2) The anlagen of left and right marginal rows do not develop simultaneously. (3) The replication processes of macronuclear segments are not recognizable during cell division. It is likely that the replication takes place during the interphase. (4) The origin of the fronto-ventral-transverse (FVT) cirral anlagen in the opisthe is characteristic: in other Tachysoma spp. these primordia are generated either from differentiated parental ciliatures (or are orientated by pre-existent organelles), or by division of the proter's FVT-cirral primordia. (5) The primordium of the undulating membranes in the proter always keeps the form of two streaks (so-called ‘semi-anlagen’). There is no conspicuous dedifferentiation or reorganization of the undulating membranes. A morphogenetic comparison with other species of this genus was carried out.

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

Zootaxa ◽  
2006 ◽  
Vol 1296 (1) ◽  
pp. 1 ◽  
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.

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

2001 ◽  
Vol 81 (3) ◽  
pp. 377-382 ◽  
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.

Morphogenetic observations on the marine ciliate Euplotes vannus during cell division (Protozoa: Ciliophora)

2009 ◽  
Vol 90 (4) ◽  
pp. 683-689 ◽  
Author(s):  
Jiamei Jiang ◽  
Chen Shao ◽  
Henglong Xu ◽  
Khaled A.S. Al-Rasheid
Keyword(s):  
Cell Division ◽  
De Novo ◽  
Marine Ciliate ◽  
Daughter Cells ◽  
Euplotes Vannus ◽  
Protozoa Ciliophora ◽  
The Right ◽  
Primary Pattern

Morphogenetic events during the division of the marine ciliate, Euplotes vannus (Müller, 1786) Diesing, 1850 were investigated using protargol impregnation: (1) the opisthe's oral primordium develops de novo in a subsurface pouch above the marginal cirri; (2) the cirral anlagen for the frontal, ventral and transverse cirri in both dividers develop separately on the surface epi-apokinetally, cirrus I/1 and marginal anlagen for daughter cells are formed de novo separately; (3) the dorsal kinety anlagen occur in a non-typical primary pattern within the parental structures at mid-body, of which the 3 right-most ones produce the 3 caudal cirri for the proter; and (4) the opisthe acquires 2 caudal cirri from the end of the right-most 2 kineties. Based on the data available, the reasons for the variation in the number of caudal cirri in E. vannus are discussed.

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

2008 ◽  
Vol 88 (1) ◽  
pp. 29-34 ◽  
Author(s):  
Xiaozhong Hu ◽  
Alan Warren ◽  
Weibo Song
Keyword(s):  
Anterior Part ◽  
Posterior Part ◽  
Differential Interference Contrast ◽  
Marine Ciliate ◽  
Contrast Microscope ◽  
Protozoa Ciliophora ◽  
Differential Interference Contrast Microscope ◽  
Planktonic Ciliate ◽  
Dual Origin

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.

scholarly journals Reconsideration of the taxonomy of the marine ciliate Neobakuella aenigmatica Moon et al., 2019 (Protozoa, Ciliophora, Hypotrichia)

2020 ◽  
Vol 2 (2) ◽  
pp. 97-108 ◽  
Author(s):  
Tengyue Zhang ◽  
Jingyi Dong ◽  
Ting Cheng ◽  
Lili Duan ◽  
Chen Shao
Keyword(s):  
Marine Ciliate ◽  
Protozoa Ciliophora

Cell division and morphology of the marine ciliate, Condylostoma spatiosum Ozaki and Yagiu (Ciliophora, Heterotrichida) based on a Chinese population

2006 ◽  
Vol 42 (1) ◽  
pp. 9-19 ◽  
Author(s):  
Chen Shao ◽  
Weibo Song ◽  
Xiaozhong Hu ◽  
Honggang Ma ◽  
Mingzhuang Zhu ◽  
...  
Keyword(s):  
Cell Division ◽  
Chinese Population ◽  
Marine Ciliate

Frontonia lynni n. sp., a new marine ciliate (Protozoa, Ciliophora, Hymenostomatida) from Qingdao, China

Zootaxa ◽  
2005 ◽  
Vol 1003 (1) ◽  
pp. 57 ◽  
Author(s):  
HONGAN LONG ◽  
WEIBO SONG ◽  
JUN GONG ◽  
XIAOZHONG HU ◽  
HONGGANG MA ◽  
...  
Keyword(s):  
New Species ◽  
Oral Cavity ◽  
Silver Staining ◽  
Sandy Beach ◽  
Contractile Vacuole ◽  
Marine Ciliate ◽  
Protozoa Ciliophora ◽  
Staining Methods ◽  
Ciliate Protozoa

The morphology, infraciliature and silverline system of a new marine ciliate, Frontonia lynni n. sp., isolated from a sandy beach at Qingdao, China, was investigated using live observation and silver staining methods. The new species is recognized by the combination of the following characters: body about 100–210 x 70–150 µm in vivo, elliptical in outline; dorsoventrally flattened (3:1); one large contractile vacuole equatorially located, right of median; 71–83 somatic kineties and three vestibular kineties; small oral cavity with peniculi 1 and 2 each having four ciliary rows and peniculus 3 possesses five gradually shortened rows.

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