colony
Phalansterium (fah-lan-stear-ee-um) is a free-living flagellate, usually found in mucoid colonies, with a single apical flagellum surrounded with a tight apical collar. Phase contrast. This image taken by Michele Bahr and David Patterson of material collected from the water column and the margins of Lake Toolik (Alaska, USA) in August, 2001. Image copyright: Michele Bahr and D. J. Patterson, used under license to MBL (micro*scope).
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Phalansterium
From the collection
Lake Toolik, Arctic Alaska
| Description of Phalansterium: Circumscription: Heterotrophic flagellates, forming colonies with cells embedded in an organic globular matrix, a single apical flagellum with tight-fitting continuous cytoplasmic collar. Ultrastructural identity: Mitochondria with tubular cristae, cells with a single apical flagellum with single basal body, anchorage involving concentric rings, which give rise to radiating microtubules. Well-developed dictyosomes associated with basal body. Flagellum with mucus but otherwise without hairs, scales, or other excrescences, no paraxonemal rods. Synapomorphy: Tubulocristate protist with single apical flagellum anchored by a radially symmetrical array of microtubules. Composition: One genus, several species. |
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