Chlamydodontida

Summary.mw-parser-output table.commons-file-information-table,.mw-parser-output.fileinfotpl-type-information{border:1px solid #a2a9b1;background-color:#f8f9fa;padding:5px;font-size:95%;border-spacing:2px;box-sizing:border-box;margin:0;width:100%}.mw-parser-output table.commons-file-information-table>tbody>tr,.mw-parser-output.fileinfotpl-type-information>tbody>tr{vertical-align:top}.mw-parser-output table.commons-file-information-table>tbody>tr>td,.mw-parser-output table.commons-file-information-table>tbody>tr>th,.mw-parser-output.fileinfotpl-type-information>tbody>tr>td,.mw-parser-output.fileinfotpl-type-information>tbody>tr>th{padding:4px}.mw-parser-output.fileinfo-paramfield{background:#ccf;text-align:right;padding-right:0.4em;width:15%;font-weight:bold}.mw-parser-output.commons-file-information-table+table.commons-file-information-table,.mw-parser-output.commons-file-information-table+div.commons-file-information-table>table{border-top:0;padding-top:0;margin-top:-8px}@media only screen and (max-width:719px){.mw-parser-output table.commons-file-information-table,.mw-parser-output.commons-file-information-table.fileinfotpl-type-information{border-spacing:0;padding:0;word-break:break-word;width:100%!important}.mw-parser-output.commons-file-information-table>tbody,.mw-parser-output.fileinfotpl-type-information>tbody{display:block}.mw-parser-output.commons-file-information-table>tbody>tr>td,.mw-parser-output.commons-file-information-table>tbody>tr>th,.mw-parser-output.fileinfotpl-type-information>tbody>tr>td,.mw-parser-output.fileinfotpl-type-information>tbody>tr>th{padding:0.2em 0.4em;text-align:left;text-align:start}.mw-parser-output.commons-file-information-table>tbody>tr,.mw-parser-output.fileinfotpl-type-information>tbody>tr{display:flex;flex-direction:column}.mw-parser-output.commons-file-information-table+table.commons-file-information-table,.mw-parser-output.commons-file-information-table+div.commons-file-information-table>table{margin-top:-1px}.mw-parser-output.fileinfo-paramfield{box-sizing:border-box;flex:1 0 100%;width:100%}} Description: Chilodonella uncinata - 400x. Date: 18 May 2013, 21:38. Source: Chilodonella uncinata - 400x. Author: Picturepest.

Summary.mw-parser-output table.commons-file-information-table,.mw-parser-output.fileinfotpl-type-information{border:1px solid #a2a9b1;background-color:#f8f9fa;padding:5px;font-size:95%;border-spacing:2px;box-sizing:border-box;margin:0;width:100%}.mw-parser-output table.commons-file-information-table>tbody>tr,.mw-parser-output.fileinfotpl-type-information>tbody>tr{vertical-align:top}.mw-parser-output table.commons-file-information-table>tbody>tr>td,.mw-parser-output table.commons-file-information-table>tbody>tr>th,.mw-parser-output.fileinfotpl-type-information>tbody>tr>td,.mw-parser-output.fileinfotpl-type-information>tbody>tr>th{padding:4px}.mw-parser-output.fileinfo-paramfield{background:#ccf;text-align:right;padding-right:0.4em;width:15%;font-weight:bold}.mw-parser-output.commons-file-information-table+table.commons-file-information-table,.mw-parser-output.commons-file-information-table+div.commons-file-information-table>table{border-top:0;padding-top:0;margin-top:-8px}@media only screen and (max-width:719px){.mw-parser-output table.commons-file-information-table,.mw-parser-output.commons-file-information-table.fileinfotpl-type-information{border-spacing:0;padding:0;word-break:break-word;width:100%!important}.mw-parser-output.commons-file-information-table>tbody,.mw-parser-output.fileinfotpl-type-information>tbody{display:block}.mw-parser-output.commons-file-information-table>tbody>tr>td,.mw-parser-output.commons-file-information-table>tbody>tr>th,.mw-parser-output.fileinfotpl-type-information>tbody>tr>td,.mw-parser-output.fileinfotpl-type-information>tbody>tr>th{padding:0.2em 0.4em;text-align:left;text-align:start}.mw-parser-output.commons-file-information-table>tbody>tr,.mw-parser-output.fileinfotpl-type-information>tbody>tr{display:flex;flex-direction:column}.mw-parser-output.commons-file-information-table+table.commons-file-information-table,.mw-parser-output.commons-file-information-table+div.commons-file-information-table>table{margin-top:-1px}.mw-parser-output.fileinfo-paramfield{box-sizing:border-box;flex:1 0 100%;width:100%}} Description: Chilodonella uncinata - 630x. Date: 18 May 2013, 21:40. Source: Chilodonella uncinata - 630x. Author: Picturepest.

Description: English: Chilodonella belongs to a morphological group called cyrtophorids which is characterized by special basket formed oral region. Collected from littoral region (stand of Phragmites) of a rain storage reservoir in Kiel (Schleswig-Holstein, Germany). Images were taken using Zeiss Universal with Olympus C7070 CCD camera. Date: 2010. Source: http://www.protisten.de/gallery_CIL/4.html. Author: Wolfgang Bettighofer.

Summary.mw-parser-output table.commons-file-information-table,.mw-parser-output.fileinfotpl-type-information{border:1px solid #a2a9b1;background-color:#f8f9fa;padding:5px;font-size:95%;border-spacing:2px;box-sizing:border-box;margin:0;width:100%}.mw-parser-output table.commons-file-information-table>tbody>tr,.mw-parser-output.fileinfotpl-type-information>tbody>tr{vertical-align:top}.mw-parser-output table.commons-file-information-table>tbody>tr>td,.mw-parser-output table.commons-file-information-table>tbody>tr>th,.mw-parser-output.fileinfotpl-type-information>tbody>tr>td,.mw-parser-output.fileinfotpl-type-information>tbody>tr>th{padding:4px}.mw-parser-output.fileinfo-paramfield{background:#ccf;text-align:right;padding-right:0.4em;width:15%;font-weight:bold}.mw-parser-output.commons-file-information-table+table.commons-file-information-table,.mw-parser-output.commons-file-information-table+div.commons-file-information-table>table{border-top:0;padding-top:0;margin-top:-8px}@media only screen and (max-width:719px){.mw-parser-output table.commons-file-information-table,.mw-parser-output.commons-file-information-table.fileinfotpl-type-information{border-spacing:0;padding:0;word-break:break-word;width:100%!important}.mw-parser-output.commons-file-information-table>tbody,.mw-parser-output.fileinfotpl-type-information>tbody{display:block}.mw-parser-output.commons-file-information-table>tbody>tr>td,.mw-parser-output.commons-file-information-table>tbody>tr>th,.mw-parser-output.fileinfotpl-type-information>tbody>tr>td,.mw-parser-output.fileinfotpl-type-information>tbody>tr>th{padding:0.2em 0.4em;text-align:left;text-align:start}.mw-parser-output.commons-file-information-table>tbody>tr,.mw-parser-output.fileinfotpl-type-information>tbody>tr{display:flex;flex-direction:column}.mw-parser-output.commons-file-information-table+table.commons-file-information-table,.mw-parser-output.commons-file-information-table+div.commons-file-information-table>table{margin-top:-1px}.mw-parser-output.fileinfo-paramfield{box-sizing:border-box;flex:1 0 100%;width:100%}} Description: Chilodonella uncinata - 630x. Date: 18 May 2013, 21:41. Source: Chilodonella uncinata - 630x. Author: Picturepest.

Summary.mw-parser-output table.commons-file-information-table,.mw-parser-output.fileinfotpl-type-information{border:1px solid #a2a9b1;background-color:#f8f9fa;padding:5px;font-size:95%;border-spacing:2px;box-sizing:border-box;margin:0;width:100%}.mw-parser-output table.commons-file-information-table>tbody>tr,.mw-parser-output.fileinfotpl-type-information>tbody>tr{vertical-align:top}.mw-parser-output table.commons-file-information-table>tbody>tr>td,.mw-parser-output table.commons-file-information-table>tbody>tr>th,.mw-parser-output.fileinfotpl-type-information>tbody>tr>td,.mw-parser-output.fileinfotpl-type-information>tbody>tr>th{padding:4px}.mw-parser-output.fileinfo-paramfield{background:#ccf;text-align:right;padding-right:0.4em;width:15%;font-weight:bold}.mw-parser-output.commons-file-information-table+table.commons-file-information-table,.mw-parser-output.commons-file-information-table+div.commons-file-information-table>table{border-top:0;padding-top:0;margin-top:-8px}@media only screen and (max-width:719px){.mw-parser-output table.commons-file-information-table,.mw-parser-output.commons-file-information-table.fileinfotpl-type-information{border-spacing:0;padding:0;word-break:break-word;width:100%!important}.mw-parser-output.commons-file-information-table>tbody,.mw-parser-output.fileinfotpl-type-information>tbody{display:block}.mw-parser-output.commons-file-information-table>tbody>tr>td,.mw-parser-output.commons-file-information-table>tbody>tr>th,.mw-parser-output.fileinfotpl-type-information>tbody>tr>td,.mw-parser-output.fileinfotpl-type-information>tbody>tr>th{padding:0.2em 0.4em;text-align:left;text-align:start}.mw-parser-output.commons-file-information-table>tbody>tr,.mw-parser-output.fileinfotpl-type-information>tbody>tr{display:flex;flex-direction:column}.mw-parser-output.commons-file-information-table+table.commons-file-information-table,.mw-parser-output.commons-file-information-table+div.commons-file-information-table>table{margin-top:-1px}.mw-parser-output.fileinfo-paramfield{box-sizing:border-box;flex:1 0 100%;width:100%}} Description: Chilodonella uncinata - 400x. Date: 18 May 2013, 21:43. Source: Chilodonella uncinata - 400x. Author: Picturepest.

Summary.mw-parser-output table.commons-file-information-table,.mw-parser-output.fileinfotpl-type-information{border:1px solid #a2a9b1;background-color:#f8f9fa;padding:5px;font-size:95%;border-spacing:2px;box-sizing:border-box;margin:0;width:100%}.mw-parser-output table.commons-file-information-table>tbody>tr,.mw-parser-output.fileinfotpl-type-information>tbody>tr{vertical-align:top}.mw-parser-output table.commons-file-information-table>tbody>tr>td,.mw-parser-output table.commons-file-information-table>tbody>tr>th,.mw-parser-output.fileinfotpl-type-information>tbody>tr>td,.mw-parser-output.fileinfotpl-type-information>tbody>tr>th{padding:4px}.mw-parser-output.fileinfo-paramfield{background:#ccf;text-align:right;padding-right:0.4em;width:15%;font-weight:bold}.mw-parser-output.commons-file-information-table+table.commons-file-information-table,.mw-parser-output.commons-file-information-table+div.commons-file-information-table>table{border-top:0;padding-top:0;margin-top:-8px}@media only screen and (max-width:719px){.mw-parser-output table.commons-file-information-table,.mw-parser-output.commons-file-information-table.fileinfotpl-type-information{border-spacing:0;padding:0;word-break:break-word;width:100%!important}.mw-parser-output.commons-file-information-table>tbody,.mw-parser-output.fileinfotpl-type-information>tbody{display:block}.mw-parser-output.commons-file-information-table>tbody>tr>td,.mw-parser-output.commons-file-information-table>tbody>tr>th,.mw-parser-output.fileinfotpl-type-information>tbody>tr>td,.mw-parser-output.fileinfotpl-type-information>tbody>tr>th{padding:0.2em 0.4em;text-align:left;text-align:start}.mw-parser-output.commons-file-information-table>tbody>tr,.mw-parser-output.fileinfotpl-type-information>tbody>tr{display:flex;flex-direction:column}.mw-parser-output.commons-file-information-table+table.commons-file-information-table,.mw-parser-output.commons-file-information-table+div.commons-file-information-table>table{margin-top:-1px}.mw-parser-output.fileinfo-paramfield{box-sizing:border-box;flex:1 0 100%;width:100%}} Description: Chilodonella uncinata - 400x. Date: 9 June 2013, 22:47. Source: Chilodonella uncinata - 400x. Author: Picturepest.

Summary.mw-parser-output table.commons-file-information-table,.mw-parser-output.fileinfotpl-type-information{border:1px solid #a2a9b1;background-color:#f8f9fa;padding:5px;font-size:95%;border-spacing:2px;box-sizing:border-box;margin:0;width:100%}.mw-parser-output table.commons-file-information-table>tbody>tr,.mw-parser-output.fileinfotpl-type-information>tbody>tr{vertical-align:top}.mw-parser-output table.commons-file-information-table>tbody>tr>td,.mw-parser-output table.commons-file-information-table>tbody>tr>th,.mw-parser-output.fileinfotpl-type-information>tbody>tr>td,.mw-parser-output.fileinfotpl-type-information>tbody>tr>th{padding:4px}.mw-parser-output.fileinfo-paramfield{background:#ccf;text-align:right;padding-right:0.4em;width:15%;font-weight:bold}.mw-parser-output.commons-file-information-table+table.commons-file-information-table,.mw-parser-output.commons-file-information-table+div.commons-file-information-table>table{border-top:0;padding-top:0;margin-top:-8px}@media only screen and (max-width:719px){.mw-parser-output table.commons-file-information-table,.mw-parser-output.commons-file-information-table.fileinfotpl-type-information{border-spacing:0;padding:0;word-break:break-word;width:100%!important}.mw-parser-output.commons-file-information-table>tbody,.mw-parser-output.fileinfotpl-type-information>tbody{display:block}.mw-parser-output.commons-file-information-table>tbody>tr>td,.mw-parser-output.commons-file-information-table>tbody>tr>th,.mw-parser-output.fileinfotpl-type-information>tbody>tr>td,.mw-parser-output.fileinfotpl-type-information>tbody>tr>th{padding:0.2em 0.4em;text-align:left;text-align:start}.mw-parser-output.commons-file-information-table>tbody>tr,.mw-parser-output.fileinfotpl-type-information>tbody>tr{display:flex;flex-direction:column}.mw-parser-output.commons-file-information-table+table.commons-file-information-table,.mw-parser-output.commons-file-information-table+div.commons-file-information-table>table{margin-top:-1px}.mw-parser-output.fileinfo-paramfield{box-sizing:border-box;flex:1 0 100%;width:100%}} Description: Chilodonella uncinata - 400x. Date: 18 May 2013, 21:42. Source: Chilodonella uncinata - 400x. Author: Picturepest.

Summary.mw-parser-output table.commons-file-information-table,.mw-parser-output.fileinfotpl-type-information{border:1px solid #a2a9b1;background-color:#f8f9fa;padding:5px;font-size:95%;border-spacing:2px;box-sizing:border-box;margin:0;width:100%}.mw-parser-output table.commons-file-information-table>tbody>tr,.mw-parser-output.fileinfotpl-type-information>tbody>tr{vertical-align:top}.mw-parser-output table.commons-file-information-table>tbody>tr>td,.mw-parser-output table.commons-file-information-table>tbody>tr>th,.mw-parser-output.fileinfotpl-type-information>tbody>tr>td,.mw-parser-output.fileinfotpl-type-information>tbody>tr>th{padding:4px}.mw-parser-output.fileinfo-paramfield{background:#ccf;text-align:right;padding-right:0.4em;width:15%;font-weight:bold}.mw-parser-output.commons-file-information-table+table.commons-file-information-table,.mw-parser-output.commons-file-information-table+div.commons-file-information-table>table{border-top:0;padding-top:0;margin-top:-8px}@media only screen and (max-width:719px){.mw-parser-output table.commons-file-information-table,.mw-parser-output.commons-file-information-table.fileinfotpl-type-information{border-spacing:0;padding:0;word-break:break-word;width:100%!important}.mw-parser-output.commons-file-information-table>tbody,.mw-parser-output.fileinfotpl-type-information>tbody{display:block}.mw-parser-output.commons-file-information-table>tbody>tr>td,.mw-parser-output.commons-file-information-table>tbody>tr>th,.mw-parser-output.fileinfotpl-type-information>tbody>tr>td,.mw-parser-output.fileinfotpl-type-information>tbody>tr>th{padding:0.2em 0.4em;text-align:left;text-align:start}.mw-parser-output.commons-file-information-table>tbody>tr,.mw-parser-output.fileinfotpl-type-information>tbody>tr{display:flex;flex-direction:column}.mw-parser-output.commons-file-information-table+table.commons-file-information-table,.mw-parser-output.commons-file-information-table+div.commons-file-information-table>table{margin-top:-1px}.mw-parser-output.fileinfo-paramfield{box-sizing:border-box;flex:1 0 100%;width:100%}} Description: Chilodonella uncinata - 400x - 55my. Date: 9 June 2013, 22:56. Source: Chilodonella uncinata - 400x - 55my. Author: Picturepest.

Summary.mw-parser-output table.commons-file-information-table,.mw-parser-output.fileinfotpl-type-information{border:1px solid #a2a9b1;background-color:#f8f9fa;padding:5px;font-size:95%;border-spacing:2px;box-sizing:border-box;margin:0;width:100%}.mw-parser-output table.commons-file-information-table>tbody>tr,.mw-parser-output.fileinfotpl-type-information>tbody>tr{vertical-align:top}.mw-parser-output table.commons-file-information-table>tbody>tr>td,.mw-parser-output table.commons-file-information-table>tbody>tr>th,.mw-parser-output.fileinfotpl-type-information>tbody>tr>td,.mw-parser-output.fileinfotpl-type-information>tbody>tr>th{padding:4px}.mw-parser-output.fileinfo-paramfield{background:#ccf;text-align:right;padding-right:0.4em;width:15%;font-weight:bold}.mw-parser-output.commons-file-information-table+table.commons-file-information-table,.mw-parser-output.commons-file-information-table+div.commons-file-information-table>table{border-top:0;padding-top:0;margin-top:-8px}@media only screen and (max-width:719px){.mw-parser-output table.commons-file-information-table,.mw-parser-output.commons-file-information-table.fileinfotpl-type-information{border-spacing:0;padding:0;word-break:break-word;width:100%!important}.mw-parser-output.commons-file-information-table>tbody,.mw-parser-output.fileinfotpl-type-information>tbody{display:block}.mw-parser-output.commons-file-information-table>tbody>tr>td,.mw-parser-output.commons-file-information-table>tbody>tr>th,.mw-parser-output.fileinfotpl-type-information>tbody>tr>td,.mw-parser-output.fileinfotpl-type-information>tbody>tr>th{padding:0.2em 0.4em;text-align:left;text-align:start}.mw-parser-output.commons-file-information-table>tbody>tr,.mw-parser-output.fileinfotpl-type-information>tbody>tr{display:flex;flex-direction:column}.mw-parser-output.commons-file-information-table+table.commons-file-information-table,.mw-parser-output.commons-file-information-table+div.commons-file-information-table>table{margin-top:-1px}.mw-parser-output.fileinfo-paramfield{box-sizing:border-box;flex:1 0 100%;width:100%}} Description: Chilodonella uncinata - 400x. Date: 9 June 2013, 22:49. Source: Chilodonella uncinata - 400x. Author: Picturepest.

Es Pujols, Balearic Islands, Spain

Alfaro, La Rioja, Spain

Grvalos, La Rioja, Espaa

A ciliated protozoon, from Lake Mono, California.

Portrait (ventral surface) of the chilodonellid ciliate Pseudochilodonopsis piscatoris (Blochmann, 1895) Foissner, 1979. The cell is drawn out to the left in a distinct pointed preoral beak. The posterior is broadly rounded. The cell is strongly dorsoventrally compressed. The dorsum is slightly domed and the ventral surface flat. The ciliature is reduced to the ventral surface except for a distinctive dorsal brush which is set back from the anterior edge of the cell and arches across the nearly its entire width. The ventral ciliature consists of right (5) and left (6) kineties separated by a wide bare postoral area. There are two circumoral kineties and a fragmented preoral kinety. The anterior ends of the left somatic kineties abut the transversely oriented fragments of the preoral kinety. These fragments ascend stair-step fashion to the tip of the beak. The cytostome, situated in the anterior 1/4 of the cell, is supported by nematodesmata forming a cyrtos. There are two contractile vacuoles. The nucleus is heteromerous. The genus Pseudochilodonopsis is distinguished from members of the similar genus, Chilodonella, by the fragmented preoral kinety and the long arched dorsal brush. Both features are difficult to appreciate without DIC optics or silver impregnation techniques. P. piscatoris feeds on green algae and diatoms. It is usually found in the surface film of samples collected from a freshwater pond near Boise,Idaho. February 2005. DIC.

Portrait (dorsal surface) of the chilodonellid ciliate Pseudochilodonopsis piscatoris (Blochmann, 1895) Foissner, 1979. The cell is drawn out to the left in a distinct pointed preoral beak. The posterior is broadly rounded. The cell is strongly dorsoventrally compressed. The dorsum is slightly domed and the ventral surface flat. The ciliature is reduced to the ventral surface except for a distinctive dorsal brush which is set back from the anterior edge of the cell and arches across the nearly its entire width(seen in this image). The ventral ciliature consists of right (5) and left (6) kineties separated by a wide bare postoral area. There are two circumoral kineties and a fragmented preoral kinety. The anterior ends of the left somatic kineties abut the transversely oriented fragments of the preoral kinety. These fragments ascend stair-step fashion to the tip of the beak. The cytostome, situated in the anterior 1/4 of the cell, is supported by nematodesmata forming a cyrtos. There are two contractile vacuoles. The nucleus is heteromerous. The genus Pseudochilodonopsis is distinguished from members of the similar genus, Chilodonella, by the fragmented preoral kinety and the long arched dorsal brush (visible here between arrows). Both features are difficult to appreciate without DIC optics or silver impregnation techniques. P. piscatoris feeds on green algae and diatoms. It is usually found in the surface film of samples Collected from a freshwater pond near Boise, Idaho February 2005. DIC.

Infraciliature (ventral surface) of the chilodonellid ciliate Pseudochilodonopsis piscatoris (Blochmann, 1895) Foissner, 1979. The cell is drawn out to the left in a distinct pointed preoral beak. The posterior is broadly rounded. The cell is strongly dorsoventrally compressed. The dorsum is slightly domed and the ventral surface flat. The ciliature is reduced to the ventral surface except for a distinctive dorsal brush which is set back from the anterior edge of the cell and arches across the nearly its entire width. The ventral ciliature consists of right (5) and left (6) kineties separated by a wide bare postoral area. There are two circumoral kineties and a fragmented preoral kinety. The anterior ends of the left somatic kineties abut the transversely oriented fragments of the preoral kinety. These fragments ascend stair-step fashion to the tip of the beak. The cytostome, situated in the anterior 1/4 of the cell, is supported by nematodesmata forming a cyrtos. There are two contractile vacuoles. The nucleus is heteromerous. The genus Pseudochilodonopsis is distinguished from members of the similar genus, Chilodonella, by the fragmented preoral kinety and the long arched dorsal brush. Both features are difficult to appreciate without DIC optics or silver impregnation techniques. P. piscatoris feeds on green algae and diatoms. It is usually found in the surface film of samples Collected from a freshwater pond near Boise, Idaho February 2005.Stained by the silver carbonate technic (see Foissner, W.Europ. J. Protistol.27,313-330;1991). Brightfield.

Infraciliature (ventral surface) of the chilodonellid ciliate Pseudochilodonopsis piscatoris (Blochmann, 1895) Foissner, 1979 in early division. Stomatogenesis is of the telokinetal type in which the oral apparatus of the posterior daughter cell (opisthe) derives from fragments of several left sided kineties. As can be seen here, stomatogenesis precedes cytokinesis. Collected from a freshwater pond near Boise, Idaho February 2005.Stained by the silver carbonate technic (see Foissner, W.Europ. J. Protistol.27,313-330;1991). Brightfield.

This is the ventral face of the ciliate showing kineties running around the mouth. A few somatic kineties run uninterrupted to the right of the cytostome (left in this picture as we are looking at the ventral face) arching around the anterior of the cell. Several right somatic kineties are interrupted by the cytostome. A long membrane of cilia lies anterior to the mouth. Gastronauta feeds mainly on diatoms. Phase contrast illumination

Gastronauta membranaceus (Engelmann in Bütschli,1889), a hypostome ciliate, distinguished by its long transversely oriented cytostome. The cytostome lacks trichites. The body is ovoid in outline and strongly dorsoventrally flattened. Ciliature is restricted to the ventral surface except for two short dorsal kineties anteriorly. A few somatic kineties run uninterrupted to the right of the cytostome arching around the anterior of the cell. Several right somatic kineties are interrupted by the cytostome. The left somatic kineties terminate at the cytostome. A single kinety runs around the circumference of the cytostome. An unciliated bare are overlies the region of the macronucleus posterior to the cytostome. The macronucleus is oblong and heteromerous (i.e. containing areas with markedly differing RNA and DNA contents resulting in irregular staining and optical characteristics). The single micronucleus is quite prominent. Two contractile vacuoles are present, one in the anterior half and one posteriorly. Gastronauta feeds mainly on diatoms. From a freshwater pond near Boise, Idaho. DIC. This image was taken by William Bourland. He now uses a Zeiss Axioskop 2 with a Spot Insight CCD camera (Diagnostic Instruments).

Gastronauta membranaceus (Engelmann in Bütschli,1889), a hypostome ciliate, distinguished by its long transversely oriented cytostome. The cytostome lacks trichites. The body is ovoid in outline and strongly dorsoventrally flattened. Ciliature is restricted to the ventral surface except for two short dorsal kineties anteriorly. A few somatic kineties run uninterrupted to the right of the cytostome arching around the anterior of the cell. Several right somatic kineties are interrupted by the cytostome. The left somatic kineties terminate at the cytostome. A single kinety runs around the circumference of the cytostome. An unciliated bare are overlies the region of the macronucleus posterior to the cytostome. The macronucleus is oblong and heteromerous (i.e. containing areas with markedly differing RNA and DNA contents resulting in irregular staining and optical characteristics). The single micronucleus is quite prominent. Two contractile vacuoles are present, one in the anterior half and one posteriorly. Gastronauta feeds mainly on diatoms. From a freshwater pond near Boise, Idaho. Phase contrast illumination.

Gastronauta membranaceus (Engelmann in Bütschli,1889), a hypostome ciliate, distinguished by its long transversely oriented cytostome. The cytostome lacks trichites. The body is ovoid in outline and strongly dorsoventrally flattened. Ciliature is restricted to the ventral surface except for two short dorsal kineties anteriorly. A few somatic kineties run uninterrupted to the right of the cytostome arching around the anterior of the cell. Several right somatic kineties are interrupted by the cytostome. The left somatic kineties terminate at the cytostome. A single kinety runs around the circumference of the cytostome. An unciliated bare are overlies the region of the macronucleus posterior to the cytostome. The macronucleus is oblong and heteromerous (i.e. containing areas with markedly differing RNA and DNA contents resulting in irregular staining and optical characteristics). The single micronucleus is quite prominent. Two contractile vacuoles are present, one in the anterior half and one posteriorly. Gastronauta feeds mainly on diatoms. From a freshwater pond near Boise, Idaho. Phase contrast illumination.