Microchlamys
Microchlamys
Microchlamys spec. n=nucleus Second specimen from Huizen

 

Microchlamys n. spec.

This species has a characteristic nucleus, broadly ovoid, where the nucleolar material is arranged peripherally. It was first discovered by Martin Kreutz, who published photomicrographs on a German forum in 2014. Shortly after I found several specimens in a small pond not far from the village of Huizen in the central area of the Netherlands. Food vacuoles contain small algae.

Dimensions: my measurements: shell Ø 47-50 µm, nucleus 10-10.9 µm; Martin Kreutz: shell Ø 42-64 µm.

Microchlamys
Microchlamys
Microchlamys spec. with three contractile vacuoles; n=nucleus
Microchlamys spec. Laegieskamp; notice the up to twelve contractile vacuoles in the periphery.
Microchlamys
Microchlamys
Microchlamys spec. nucleus arrowed – Laegieskamp, and at right structure of the dorsal side of the test.
The photomicrographs below were made by Martin Kreutz, who sent them to me. He thought it was Microchlamys patella, but the arrangement of the nucleolar material is quite different from the central nucleolus as described for Microchlamys patella.
Microchlamys
KV=contractile vacuole
Microchlamys
Fa=folds, KV= contractile vacuole, Mo=pseudostome
Microchlamys
Mo=pseudostome, Fa=folds in the membrane
Microchlamys
ZK=nucleus, S=shell, Mb=membrane
Microchlamys
Mo=pseudostome, Fa=folds in the membrane
Microchlamys
Recent posts

Centropyxis declivistoma

Centropyxis declivistoma, after Chardez, 1990 Centropyxis declivistoma Chardez, 1990 Diagnosis: Test ovoid, slightly compressed dorso-ventrally, especially in the anterior region, embedded with polymorph mineral platelets. Pseudostome

Read More »

Plagiopyxis bicamera

Plagiopyxis bicamera, after Coûteaux, 1978 Plagiopyxis bicamera Coûteaux, 1978 Diagnosis: Test elongated, in ventral view elliptical, dorso-ventrally compressed, colorless or yellowish, with a cryptostome with visor.

Read More »

Arcella jurassica

Arcella jurassica, after Olivier, 1944 Arcella jurassica Olivier, 1944 Diagnosis: Test pyramid-shaped but strongly truncated, in lateral view trapezium-shaped, with 5-8 planes; pseudostome surrounded by

Read More »

Assulina discoides

Assulina discoides , after Bobrov, Shimano and Mazei, 2012 Genus Deharvengia Bobrov, Shimano and Mazei, 2012 Diagnosis: Shell large in size, disc shaped, colorless, transparent,

Read More »

Deharvengia

Deharvengia japonica, after Bobrov, Shimano and Mazei, 2012 Genus Deharvengia Bonnet, 1979, emend. Bobrov, Shimano and Mazei, 2012 Diagnosis: Test transparent, oval or ovoid in

Read More »