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Girvanella
Taxonomy
Girvanella was named by Nicholson and Etheridge (1878). It is not extant. It is considered to be a form taxon. Its type is Girvanella problematica.
It was assigned to Cyanophyta by Nicholson and Etherdge (1878), Danielli (1981); to Porostromata by Kiessling (2003); to Renalcidae by Debrenne et al. (2015); and to Girvanellaceae by Krainer and Vachard (2019).
It was assigned to Cyanophyta by Nicholson and Etherdge (1878), Danielli (1981); to Porostromata by Kiessling (2003); to Renalcidae by Debrenne et al. (2015); and to Girvanellaceae by Krainer and Vachard (2019).
Species
Species lacking formal opinion data
G. ambigua, G. convoluta, G. ducci, G. duci, G. ducii, G. fasciculata, G. gustafsoni, G. incrustans, G. issonella, G. kasakiensis, G. magna, G. media, G. minuta, G. minuta, G. nicholsoni, G. permica, G. prolixa, G. sibirica, G. sinensis, G. staminea, G. staminea, G. tasmaniaensis, G. wetheredi, G. wetheredii, G. wetheredii
Synonymy list
| Year | Name and author |
|---|---|
| 1878 | Girvanella Nicholson and Etherdge |
| 1878 | Girvanella Nicholson and Etheridge |
| 1981 | Girvanella Danielli pp. 94 - 101 |
| 2003 | Girvanella Kiessling |
| 2015 | Girvanella Debrenne et al. p. 917 |
| 2019 | Girvanella Krainer and Vachard p. 22 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Girvanella Nicholson and Etheridge 1878
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†Girvanella mexicana Cooper et al. 1952
†Girvanella problematica Nicholson and Etheridge 1878
†Girvanella richmondensis Miller 1882
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. M. C. Danielli 1981 | Microscopic tubular encrustations and/or impregnations of sheaths of filamentous organisms; filaments arranged at random or prostrate, rarely vertically; filaments single or in growths of variable size, shape and density; orientation parallel to random; filaments unbranched and slightly to highly sinuous; cell space approximately circular in cross section, sometimes compressed or with slight irregularities; cell space usually occupied by cement spar but sometimes micritic, cement developing either by growth from grains in the micritic tube or independently, as druses or equidimensional particles; aseptate micritic calcite tube comprising prisms or equidimensional grains, or both, the prisms with their long axes arranged perpendicularly to the filament axis and in a single layer, sometimes with smaller intercalated prisms. |
Measurements
No measurements are available
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| Source: g = genus, p = phylum | |||||
| References: Church 1991, Vachard and Aretz 2004 | |||||
Collections (414 total)
Oldest occurrences | |||
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Ediacaran | China (Shaanxi) | G. sp. (51735) | |
| Nemakit-Daldynian | Russian Federation (Taymyr) | G. sp. (81110) | |
| Atdabanian | Spain (Córdoba) | G. sp. (78585) | |
| Atdabanian | Germany (Brandenburg) | G. sp. (24190) | |
| Atdabanian | Russian Federation (Krasnoyarskiy Kray) | G. sp. (81429) | |
| Atdabanian | Mongolia | G. problematica (63210) G. sibirica (45947) | |
| Atdabanian | Morocco | G. sp. (80879 80880 80885) | |
| Atdabanian | Russian Federation (Tuva) | G. sp. (81246 81247) | |
| Atdabanian | Australia (South Australia) | G. sp. (81170 81172 97741) | |
| Atdabanian - Botomian | Mongolia | G. sp. (22939 22940) | |
Youngest occurrences |
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| Time interval | Ma | Country or state | PBDB collection number |
| Early/Lower Aptian | Egypt (Sinai) | G. problematica (193559) | |
| Late/Upper Aptian | France | G. sp. (148645) | |
| Late/Upper Aptian | Japan | G. sp. (49990) | |
| Early/Lower Albian | Spain | G. sp. (56771) | |
| Late/Upper Albian | Brazil | G. sp. (157868 157869) | |
| Turonian | Tunisia | G. sp. (74219) | |
| Santonian | Germany | G. sp. (74483 74486) | |
| Campanian - Maastrichtian | Marshall Islands | G. sp. (74534) | |
| Paleocene | Croatia | G. sp. (87251) | |
| Messinian | Italy | G. sp. (168730) | |