Microworld

world of amoeboid organisms

Menu
Pyxidicula patens var.
Pyxidicula patens var., just after dividing

Pyxidicula patens var.

Diagnosis: Shell hemispherical, aperture nearly as large as the diameter of the shell; aperture bordered by a clear rim, which is a broadened extension of the shell wall; this rim has an alveolated structure; usually a hyaline veil is attached to the rim; it is usually curved inwards and strongly curved outwards and more or less undulated; nucleus single, spherical, with some dispersed spherical granules.

Dimensions: My measurements: 35-44 µm, nucleus c. 10 µm.

Ecology: freshwater, in Sphagnum from the Haaksbergerveen, and Kloosterhaar, the Netherlands. It was abundantly present in samples.

Remarks: This species differs from the nominal species by the structure and angle of its rim, which is thicker and not curved inward. The veil is large, seemingly hollow and often irregular shaped. It is difficult to imagine the real shape and structure of this veil. It is also hard to observe where this veil is attached to the shell. What looks like a flat broad rim, is in fact a wide depressed tubular ring.
All photomicrographs on this page show cells from the same sample.

Pyxidicula patens var.
Pyxidicula patens var.
Pyxidicula patens var., with pseudopodia (left) and hyaline fringe
Pyxidicula patens var.
Cross section of the shell, with the collar marked by arrows.
Pyxidicula patens var.
Pyxidicula patens var.
Living cell, lateral view, and shell, with nucleus (arrow)
Pyxidicula patens var.
Pyxidicula patens var.
Living cell, lateral view, with smooth veil; the rim or collar has an alveolated structure (arrow)
Pyxidicula patens var.
Pyxidicula patens var.
Rim, with alveoli and veil
Pyxidicula patens var.
Pyxidicula patens var.
Rim with alveoli and veil and shell without pronounced collar and without veil
Pyxidicula patens var.
Structure of a shell
Recent posts

Haplomyxa spec.

Main cell body Haplomyxa spec. Description: The cell had a cylindrical flattened body from which numerous granuloreticulopodia emerged. The common shape was more or less

Read More »

Valkanovia delicatula

V. delicatula, after Valkanov, 1962 Genus Valkanovia  Tappan, 1966 Diagnosis: Shell ovoid, oblate, elliptical in cross-section, composed of elongated elliptical hyaline scales arranged in a

Read More »

Gocevia pontica

Gocevia pontica, after Valkanov, 1934 Gocevia pontica Valkanov, 1934 Diagnosis: Clearly addressed bipolarity. Body covered by a weakly flexible tectum covered with foreign bodies. The

Read More »

Nabranella

N. brevis, after Snegovaya and Alekperov, 2009 Genus Nabranella Snegovaya and Alekperov, 2009 Diagnosis: Shell oval or spherical shape without neck. Apical top flat and

Read More »

Armipyxis

Genus Armipyxis Dekhtiar, 2009 Genus Armipyxis was created by Dekhtiar (2009) to accommodate all species with internal struts. However, C. aculeata may also have struts, although

Read More »

Netzelia pseudolimnetica

N. pseudolimnetica, after Penard, 1902 Netzelia pseudolimnetica Ogden and Meisterfeld, 1989 Synonym Difflugia limnetica (Levander, 1900) Penard, 1902. D. limnetica – Pejler, 1962, Oikos, 12,

Read More »

Cylindrifflugia hiraethogii

C. hiraethogii, after Ogden. 1983 Cylindrifflugia hiraethogii (Ogden, 1983) González-Miguéns et al., 2022 Diagnosis: the shell is light yellow or transparent, thin pyriform with a distinct

Read More »

Cylindrifflugia bacillariarum

  C. bacillariarum, 103 – 114 µm – Fochteloërveen, Netherlands   Cylindrifflugia bacillariarum (Perty, 1849) n. comb. González-Miguéns et al., 2022 Diagnosis: shell transparent, colorless or

Read More »

Cylindrifflugia elegans

C. elegans, length 84-102 µm, Gaasterland Cylindrifflugia elegans (Penard, 1890) n. comb. González-Miguéns et al., 2022 Basionym: Difflugia elegans Penard, 1890 Diagnosis: shell outline rough, pyriform

Read More »

Cylindrifflugia lanceolata

C. lanceolata, shells 153-169 µm long, nuclei 23-26 µm (Naardermeer, Netherlands) Cylindrifflugia lanceolata (Penard, 1890) n. comb. González-Miguéns et al., 2022 Basionym: Difflugia lanceolata Penard,

Read More »