Microworld

world of amoeboid organisms

Menu
Galeripora arenaria
G. arenaria, after Bonnet, 1964

Galeripora arenaria  (Greeff, 1866) González-Miguéns et al., 2021
Basionym: Arcella arenaria Greeff, 1866
Synonyms: Arcella aureola Maggi, 1888
Arcella microstoma Penard, 1890
Arcella arenaria form. compressa Chardez, 1957: 69
Arcella arenaria var. grandis Bunesco & Matic, 1982
Arcella arenaria var. irregularis Decloître, 1972: 167
Arcella arenaria var. sphagnicola Deflandre, 1928: 249
Arcella arenaria var. sphagnicola form. undulata Decloître, 1965: 33

Diagnosis: Shell always circular in apical view, more or less dome-shaped in lateral view; dorsal surface usually with slight folds, but very often flattened. Shell yellowish brown to dark brown in color. Aperture small, circular in shape, its diameter barely reaching 1/5-1/6 that of the shell. Many small pores, 8-28 in number, around the aperture. Height of the shell not less than 1/2 diameter of the shell. Neither remarkable border nor bosses around the lateral margin. Many nuclei present: the large ones usually 3 in number and arranged in an equilateral triangle, the small ones not constant in number, varying 3-5, arranged irregularly. The pseudopodia very short, 6 at most, many vacuoles developing along the ectoplasm.

Dimensions: In literature shell 75-130 µm in diameter, 21-50 µm in height, aperture 12-28 µm in diameter, pores 8-18.

Ecology: Mostly in dryer mosses; on Hypnum and Polytrichum, also on lichens on trees and between Sphagnum.

Remarks: This species resembles Galeripora catinus Penard; it can also be confused with Galeripora artocrea. The folding of the dorsal surface is most distinct in lateral view.

Reference: González-Miguéns, R., Soler-Zamora, C., Villar-dePablo, M., Todorov, M., Lara, E., 2021. Multiple convergences in the evolutionary history of the testate amoeba family Arcellidae (Amoebozoa: Arcellinida: Sphaerothecina): when the ecology rules the morphology. Zoological Journal of the Linnean Society zlab074. https://doi.org/10.1093/zoolinnean/zlab074

Galeripora arenaria
G. arenaria, dry moss, NL, 2021
Galeripora arenaria
Galeripora arenaria
Arcella arenaria
Arcella arenaria
Recent posts

Apolimia

A. rotundistoma, from Korganova, 1987 Genus Apolimia Korganova, 1987 Diagnosis: Shell ovoid, quite large, opaque, round in cross section, densely covered with round or oval

Read More »

Erugomicula

E. bidens, 315 and 270 µm, Naardermeer, the Netherlands Genus Erugomicula Nasser, Gregory, Singer, Patterson and Roe, 2021 Typespecies: Erugomicula bidens (Penard, 1902) Diagnosis: laterally-compressed,

Read More »

Erugomicula bidens

Two shells from the same sample, 310 µm (Naardermeer, Netherlands) Erugomicula bidens (Penard, 1902) Basionym: Difflugia bidens Penard, 1902 Diagnosis: Test ovoid, compressed in cross-section,

Read More »

Cylindrothecina

Infraorder Cylindrothecina González-Miguéns et al., 2022   Diagnosis:  can be diagnosed by its specific sequences of the mitochondrial and nuclear DNA  markers (COI, NADH and

Read More »

Organic-walled species

Specimen with an optical cross-section of the peduncle (left) Organic-walled species Diagnosis: Multinucleated organic-walled monothalamous foraminifera. Test spherical to oval shaped, with a hyaline, flexible,

Read More »

Velamentofex tyrolensis

V. tyrolensis, two specimens Velamentofex tyrolensis Völcker and Clauß, 2020 April 2022, I found two specimens in a sample from the pond in Crailoo, Netherlands. I could

Read More »

Raphidiophrys spec. nov.

Raphidiophrys n. sp. Raphidiophrys n. sp. Diagnosis: Plate-scales canoe-shaped, elongated, with tapering, rounded poles, slightly curved upwardly. Light microscopically, these plate-scales show a clear rim;

Read More »

Lacogromia spec. Naardermeer

Lacogromia sp., Naardermeer, the Netherlands, 2022 (n=nucleus) Lacogromia sp. Six living specimens were found in an old sediment sample from a freshwater ditch in nature

Read More »

Sphenoderia rhombophora

S. rhombophora , after Bonnet, 1966 Sphenoderia rhombophora Bonnet, 1966 Diagnosis: Test hyaline, ellipsoidal, very slightly compressed. Fundus relatively narrow. Pseudostome largely truncated. Neck very

Read More »

Sphenoderia ovoidea

S. ovoidea , after Jung, 1942 Sphenoderia ovoidea Jung, 1942 Diagnosis: Shell with four layers of plate-scales. Distinguished from S. fissirostris by the ovoid tapering

Read More »