Strombidium aeilberti, Song, 2005
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publication ID |
https://doi.org/ 10.1080/0022293042000195966 |
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DOI |
https://doi.org/10.5281/zenodo.4581236 |
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persistent identifier |
https://treatment.plazi.org/id/03E44036-FFE4-3B21-FE6A-FC0E6A71FEC8 |
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treatment provided by |
Carolina |
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scientific name |
Strombidium aeilberti |
| status |
sp. nov. |
Strombidium aeilberti nov. spec.
( Figures 1 View Figure 1 , 2 View Figure 2 ; Table I)
Diagnosis. Marine Strombidium , about 45–60 X 35–50 mm in υiυo with truncated obconical body shape and conspicuous distended cell surface which covers the posterior half of the cell; buccal cavity extending posteriorly to about one-third of body length; about eight buccal and 15 collar membranelles; girdle kinety completely closed, consisting of ca 60 dikinetids; ventral kinety prominently long with about 30 densely packed dikinetids, extends anteriorly to girdle area; extrusomes about 20 mm long, grouped in rows and arranged anterior to girdle kinety; single globular macronucleus.
Ecological characteristics for sampling sites. Sandy coastal area with clean water, salinity was 33, pH about 8.1, water temperature ranged from 5 to 9 ° C.
Type deposition. One permanent slide as holotype with protargol-impregnated specimens is deposited in the Laboratory of Protozoology , Ocean University of China, Qingdao .
Dedication. I dedicate this species to Prof. Dr Norbert Wilbert (Institute of Zoology, Bonn University, Germany), a well-respected and great German protozoologist, who has made significant contributions to ciliate taxonomy and ecology during the last 30 years.
Description. Size mostly about 50 X 40 mm in υiυo. Body shape generally invariable, broadly obconical and circular in cross-section, widest at anterior third of cell length ( Figure 1A View Figure 1 ), while in some individuals body might be slightly asymmetric when viewed dorso-ventrally ( Figure 1E View Figure 1 ). Apical protrusion or collar inconspicuous in υiυo, usually undetectable after fixation ( Figure 1F, H View Figure 1 ). Buccal cavity relatively shallow and inconspicuous, extending posteriorly to about 25–30% of cell length ( Figure 1A, E View Figure 1 ). Ventral groove conspicuous and extending from girdle region to posterior cell end, containing long ventral kinety ( Figure 1F View Figure 1 ). Cilia in collar membranelles about 25–30 mm long, stretching anteriorly when swimming, cilia in buccal membranelles ca 10 mm in length ( Figure 1A View Figure 1 ).
Perilemma remarkable, always as conspicuously distended ‘lorica-like’ structure covering the posterior half of live cell ( Figure 1A, E View Figure 1 ), but only about 40% after protargol impregnation where the anterior cell portion is swollen ( Figure 1F View Figure 1 ). No cortical platelets recognizable either in υiυo or in silvered specimens. Extrusome girdle conspicuous, extrusomes about 20 mm long, bar-like and regularly grouped (each group with about six extrusomes), which are closely spaced anterior to the girdle kinety ( Figure 2C View Figure 2 ). Outer ends of extrusomes arranged in oblique rows (anchored obliquely beneath pellicle), which make cell surface granulated and slightly punctated ( Figure 1B View Figure 1 ).
Cytoplasm basically colourless to slightly greyish, containing numerous light-reflecting, lipid-like granules (ca 2–5 mm in diameter) and food vacuoles containing diatoms, flagellates etc., which often render cells rather opaque or even completely dark when observed at lower magnifications ( Figure 1E View Figure 1 ). Macronucleus about 15–20 mm across, spherical in shape and centrally located, usually contains many large roundish nucleoli as demonstrated after impregnation ( Figure 1F View Figure 1 ); no micronucleus recognized.
Locomotion very fast and changing direction frequently, never stops swimming ( Figure 1C View Figure 1 ). This organism seems fragile for it readily bursts especially when a cover glass is used for observing under the microscope.
Buccal apparatus typical of genus, consisting of 14–16 collar membranelles (CM), eight buccal membranelles (BM) and one single-rowed paroral membrane ( Figure 1D View Figure 1 ). Bases of CM about 10 mm long, each composed of three equal-length basal body rows ( Figure 2A, D View Figure 2 : arrowheads); BM being continuous with CM, similar to CM in structure but shorter in length of bases (about 5–7 mm) ( Figure 2A View Figure 2 : arrow), which invaginate ventrally into centre of cell. Paroral membrane (PM) along right border of buccal cavity with densely packed kinetosomes. Pharyngeal fibres up to 20 mm long after protargol impregnation ( Figure 1D View Figure 1 ).
Somatic ciliature as shown in Figure 1F, G View Figure 1 . Girdle kinety (GK) completely closed and posterior to extrusome girdle ( Figure 2E, F View Figure 2 ), composed of approximately 60 dikinetids ( Figure 1F View Figure 1 ). Ventral kinety (VK) conspicuously long, with about 30 densely spaced dikinetids in shallow groove, commencing underneath girdle kinety on ventral side and extending across posterior pole to dorsal side ( Figure 1F, G View Figure 1 ).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.