2 mm individual of Gromia oviformis, copyright Gary McDonald.

Belongs within: Endomyxa.

The Gromiidae are a group of amoeboid protists with an organic test (note that Loeblich & Tappan, 1964, included a number of taxa in Gromiidae that are no longer regarded as closely related to the type genus Gromia; it is possible that other genera listed below are similarly misplaced).

Characters (from Loeblich & Tappan 1964): Test membranous or pseudochitinous, rigid or slightly flexible, without distinct plates or scales, but with some siliceous elements, and commonly with foreign material.

Gromiidae [Gromiacea, Gromiada, Gromidae, Gromiida, Gromiina, Gromiinae, Grominae, Nuditestiidae, Pseudogromiinae]
|--Micramphoraeopsis Sudzuki 1979G86
| `--M. pinangensis Sudzuki 1979G86
|--Amoebogromia Giard 1900LT64
| `--*A. cinnabarina Giard 1900LT64
|--Lagunculina Rhumbler 1904 [=Arlagunculum Rhumbler 1913, Ovulina Gruber 1884 nec Ehrenberg 1845 nec Schultze 1854]LT64
| `--*L. urnula (Gruber 1884) [=*Ovulina urnula, *Arlagunculum urnulum]LT64
|--Urnulina Gruber 1884 [=Arurnulum Rhumbler 1913]LT64
| |--*U. difflugiaeformis Gruber 1884 [=*Arurnulum difflugiaeforme]LT64
| `--U. compressaC40
`--Gromia Dujardin 1835 [incl. Arcellina DuPleiss 1876 non Carter 1856, Hyalopus Schaudinn 1894 non Corda 1838 (ICBN)]LT64
|--*G. oviformis Dujardin 1835LT64
|--G. dubia Gruber 1884G84
|--G. dujardinii Schultze 1854 [=*Hyalopus dujardinii]LT64
|--G. fluvialis Dujardin 1837 [=Allogromia fluvialis]LT64
|--G. lagenoides Gruber 1884G84
|--*Arcellina’ marina DuPleiss 1876LT64
`--G. sphaericaC-SCL15

*Type species of generic name indicated


[C-SCL15] Cavalier-Smith, T., E. E. Chao & R. Lewis. 2015. Multiple origins of Heliozoa from flagellate ancestors: new cryptist subphylum Corbihelia, superclass Corbistoma, and monophyly of Haptista, Cryptista, Hacrobia and Chromista. Molecular Phylogenetics and Evolution 93: 331–362.

[C40] Cushman, J. A. 1940. Foraminifera: Their classification and economic use 3rd ed. Harvard University Press: Cambridge (Massachusetts).

[G86] Golemansky, V. G. 1986. Rhizopoda: Testacea. In: Botosaneanu, L. (ed.) Stygofauna Mundi: A Faunistic, Distributional, and Ecological Synthesis of the World Fauna inhabiting Subterranean Waters (including the Marine Interstitial) pp. 5–16. E. J. Brill/Dr. W. Backhuys: Leiden.

[G84] Gruber, A. 1884. Die Protozoen des Hafens von Genua. Verhandlungen der Kaiserlichen Leopoldinisch-Carolinischen Deutschen Akademie der Naturforscher [Nova Acta Academiae Caesareae Leopoldino-Carolinae Germanicae Naturae Curiosorum] 46 (4): 473–539, pls 7–11.

[LT64] Loeblich, A. R., Jr & H. Tappan. 1964. Sarcodina: chiefly “thecamoebians” and Foraminiferida. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt C. Protista 2 vol. 1. The Geological Society of America and The University of Kansas Press.

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