Genus Lesquereusia Schlumberger (1845)

Diagnosis: test with asymmetrical neck, more or less attached to the body, composed of endogenous siliceous rods or in other species with collected mineral particles, bound together with organic cement. Nucleus ovular.

Type species: Lesquereusia spiralis (Ehrenberg 1840).

Ecology: in mosses like sphagnum and in detritus. Species feeding on diatoms and green algae.

Remarks: Species differ mainly in shape of the siliceous rods, the amount of mineral particles and the orientation of the neck.

This genus was erected by Schlumberger (1845) and obviously named after the swiss naturalist Lesquereux. By lapsus it was first published as Lecqereusia. The currently used spelling was introduced by Hopkinson (in Cash & Hopkinson, 1909)!

16 species have been described, the type species is Lesquereusia spiralis (Ehrenberg, 1840). Three well known species are L. spiralis, L. modesta and L. epistomium.  However, D. modesta and D. spiralis are sometimes hard to distinguish from each other, because they can have a mixture of endogenous rods and mineral particles. I am not sure if both species are  really different species.

Lesquereusia spiralis
Lesquereusia modesta
Lesquereusia spiralis and L. modesta, typical forms
Lesquereusia spiralis, with dark mucus surrounding the collar
Recent posts

Microcorycia spec. 4

Microcorycia spec. , folded Microcorycia spec.? I found this specimen in a sample from moss on a fallen tree in a marsh in the Naardermeer,

Read More »

Microchlamys spec.

Microchlamys spec., the same cell in lateral view Microchlamys spec. Diagnosis: Shell relatively high compared with all described species. The diameter is twice the height.

Read More »

Excentrostoma

Infraorder Excentrostoma Kosakyan et al., 2016   Diagnosis: Testate amoebae with an eccentrically placed aperture; test organic with few or many xenosomes. Family Centropyxidae Jung, 1942  

Read More »

Longithecina

Infraorder Longithecina Kosakyan et al., 2016   Diagnosis: Testate amoebae with a more or less tubular or cylindrical test and a terminal aperture; test with

Read More »