Galeripora megastoma – Microworld

Microworld

world of amoeboid organisms

Menu

Galeripora megastoma

Large shell, 370 µm in diameter

Galeripora megastoma (Penard, 1902) n. comb.
Basionym: Arcella megastoma Penard, 1902

Diagnosis: Shell very flattened with a wide aperture; ratio diameter aperture/shell usually 0.45-0.53; with 2-200 nuclei.

Dimensions: Shell diameter 140-402 µm; apertural diameter 40-216 µm. My measurements: Shell 197-370 µm, apertural diameter 87-190 µm.

Ecology: Freshwater, marshes and ponds, among algae. Common, but never abundant.

Remarks: I have measured the diameter of the aperture and the shell of a number of discoid Galeripora specimens from several locations in the Netherlands. The results are plotted in the graph below and show the existence of probably four different taxa, including G. discoides and G. megastoma.

Galeripora megastoma

Galeripora megastoma

Galeripora megastoma, aperture with pores.

Arcella megastoma

Galeripora megastoma in lateral view

Ferry Siemensma
Created februari 22, 2019
Last updated januari 16, 2022

Menu

Recent posts

Apolimia

juni 30, 2022

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

Erugomicula

juni 29, 2022

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,

Erugomicula bidens

juni 29, 2022

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,

Cylindrothecina

juni 29, 2022

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

Organic-walled species

mei 11, 2022

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,

Velamentofex tyrolensis

april 21, 2022

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

Raphidiophrys spec. nov.

april 19, 2022

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;

Lacogromia spec. Naardermeer

februari 17, 2022

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

Sphenoderia rhombophora

februari 17, 2022

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

Sphenoderia ovoidea

februari 17, 2022

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