Microworld

world of amoeboid organisms

Menu
Multicilia lacustris
M. lacustris – from Lauterborn, 1895

Genus Multicilia (Cienkowki, 1881) Lauterborn, 1895

Diagnosis: Cells small, 20-40 µm, spherical or slightly ovoid, with amoeboid locomotion. Surface covered with numerous long cilia, 1.5-3 times the cell diameter. Between the cilia one can often observe short blunt bulges. No difference between endo- and ectoplasm. One or more vesicular nuclei. Contractile vacuoles only observed in freshwater species. Feeding by means of blunt pseudopodia.

Two species.

Remarks: Lauterborn describes the cilia as true cilia (flagella), which never change, not disappear or appear, but are always present.

Multicilia lacustris Lauterborn, 1895

Diagnosis: Cell body spherical or slightly ovoid, usually with slight amoeboid locomotion. Outer layer of cytoplasm with numerous embedded granules. Cilia 1.5-2 X the cell diameter, usually of different length. Several nuclei present; contractile vacuoles small, very numerous, close to the cell membrane. Cell body always filled with preyed flagellates (Chlamydomonas sp.)

Dimensions: body 30-40 µm

Ecology: Freshwater, River Rine, Germany (Lauterborn)

Multicilia marina Cienkowski, 1881

Diagnosis: Cell body spherical, colorless, rather vivid amoeboid locomotion. Cilia up to three times the cell diameter, slowly moving. One nucleus; no contractile vacuoles observed.

Dimensions: Cell diameter 20-30 µm

Ecology: Marine; White Sea, Black Sea, Mediterranean

Remarks: Multicilia marina is a multiciliated amoeboid protist that was first isolated in 1880 by L. Cienkowski (Cienkowski,1881) at the Solovetskaya station (Onega Bay, White Sea). Its cells are usually spherical, about 30–40 µm in diameter, although some of them can have an oblong or irregular form. Typically, each cell has approximately 20–30 cilia.
Multicilia marina normally feeds by phagocytosis, using lobopodia for the capture of large prey (gymnamoebae). Cells in culture roll over the substratum without any polarity, and have normally 20–30 long cilia beating more irregularly and without visible coordination; a peculiar formation of small cells with 2–4 cilia and giant, branching and budding ones with 100–200 cilia is described.
Ultrastructural study (Mikrjukov et al, 1998) shows the cells to be covered with a free glycocalyx, to have a single central nucleus, mitochondria with tubular cristae, and to have no modifications in the cortical cytoplasm. The basal apparatus of each cilium is represented by a single kinetosome, an open conical microtubular sheath surrounding it, and a microtubular fiber connecting each kinetosome with the sheath of a neighboring one. No structural connection between the basal apparatus and the centrally located nucleus has been observed. The irregular movement of Multicilia seems to result from its adaption to capturing its main food: naked amoebae.

Mikrjukov (1998) proposed a new phylum Multiflagellata to include the genus Multicilia, and amended the diagnosis of M. marina.

Literature:

Lauterborn, R (1895) Protozoenstudien. III. Über eine Süßwasserart der Gattung Multicilia Cienkowsky (M. lacustris nov. spec.) und deren systematische Stellung. Zeitschrift für wissenschaftliche Zoologie Bd.60: 236-248

Recent posts

Kibisidytes

K. marinus, after Jepps, 1934 Kibisidytes marinus Jepps, 1934 Diagnosis: Small amoeboid organism occurring in the sea, attached to the surface film or to some

Read More »

Phaeobola

P. aeris from Dumack et al., 2000 Phaeobola Dumack et al., 2000 Diagnosis: Cells roundish to oval shaped. Shell colorless to amber-colored, rough surface, few

Read More »

Rhizaspis armata

R. armata, 68 µm long, excl. spines – Laegieskamp Rhizaspis armata (Lauterborn, 1901) Dumack et al., 2021 Basionym: Pamphagus armatum Lauterborn, 1890 Diagnosis: Theca membranous,

Read More »

Rhizaspis spinosa

The original description with original drawings, Penard, 1890. Rhizaspis spinosa (Penard, 1890) Dumack et al., 2021 Basionym: Trinema spinosum Penard, 1890 Diagnosis: Theca membranous, ovoid

Read More »

Difflugia “pseudoclaviformis”

Difflugia “pseudoclaviformis”, front and side view, 424 µm Difflugia “pseudoclaviformis” Diagnosis: Shell pyriform, compressed, with a more or less pronounced aboral protuberance; shell composed of

Read More »

Difflugia from Lolo Pass

Shells 461-448 µm, stacked image. I found this large en remarkable shells in sediment of a small mountain lake near Lolo Pass, Montana USA. It differs

Read More »

Foraminifer drome

Unknown species, collected from the river Drôme, France, 2021 Unknown species September 2021, I found about ten specimens of an agglutinated foraminifer in a sample

Read More »

Cyclopyxis spec

Cyclopyxis spec., 168 µm Cyclopyxis spec. Diagnosis: Shell circular in ventral and dorsal view, more or less hemispherical in lateral view (height/diameter ≈ 0.5); lateral

Read More »

Difflugia fallax

Difflugia fallax, from Penard, 1902 Difflugia fallax Penard, 1890 Diagnosis: Shell hyaline or yellowish-greenish, black at low magnification, round in cross section, formed of a

Read More »