Olgunia
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| Olgunia Temporal range: late Ediacaran ~ | |
|---|---|
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| Reconstruction of Olgunia bondarenkoae | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Porifera (?) |
| Family: | †Olgunidae |
| Genus: | †Olgunia Luzhnaya, 2025 |
| Species: | †O. bondarenkoae |
| Binomial name | |
| †Olgunia bondarenkoae Luzhnaya, 2025 | |
Olgunia is an extinct genus of colonial, sponge-like organisms from the late Ediacaran of the Russia, and is the namesake of the family Olgunidae. It is a monotypic genus, containing only Olgunia bondarenkoae.
The holotype material, and accompanying material, of Olgunia was found in the Erga Beds of the Mezen Formation, Arkhangelsk Oblast, Russia, and formally described and named in 2025.[1]
The generic name Olgunia, and specific name bondarenkoae are derived from the Latinised forename and surname of Olga Borisovna Bondarenko, who is an associate professor at the Department of Paleontology at Lomonosov Moscow State University, known researcher on Paleozoic heliolitid corals, and also a teacher to the author that described the fossil material.[1]
Description
Olgunia bondarenkoae consists of a grouping of oval, saccular bodies, which grow up to a maximum length of 50 mm (2.0 in), and a width of 10 mm (0.4 in). These are suggested to have stood up above the surface, and were attached to the substrate via small attachment disks, similar to Funisia and Vaveliksia, which are recorded to get up to 7 mm (0.3 in) in diameter, with some noted to have tubercles in their center. The saccular bodies are noted to have irregular transverse partitions, ranging from intervals of 1–5 mm (0.0–0.2 in), with noted zonal 'grouping' of some of the partitions, which has been suggested to be a response to a change in the local environment, something observed in tabulate corals.[1]
Whilst it is noted to be similar to other members of the family Olgunidae, it still has many noted distinctive differences. Compared to Vaveliksia, there are a greater number of less regularly arranged partitions, alongside dichotomous branching of the saccular bodies and a colonial lifestyle. Compared to Funisia, the bodies are more sac-like in nature instead of stick-like, and the differing concentric nature of either organism.[1]