Fluvionectes Temporal range: Campanian ~ | |
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Holotype with gastroliths | |
Scientific classification ![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Reptilia |
Superorder: | † Sauropterygia |
Order: | † Plesiosauria |
Family: | † Elasmosauridae |
Genus: | † Fluvionectes Campbell et al., 2021 |
Species: | †F. sloanae |
Binomial name | |
†Fluvionectes sloanae Campbell et al., 2021 | |
Fluvionectes (meaning "river swimmer", from both Latin and Greek) is a genus of elasmosaurid plesiosaur found in the Dinosaur Park Formation in Alberta, Canada. [1]
The holotype specimen of Fluvionectes is a partial skeleton preserving an osteologically mature, likely a young adult individual that would have reached 5–5.2 m (16–17 ft) long and weighed 392 kilograms (864 lb). [1] [2] A more mature, larger, but more fragmentary specimen (TMP 2009.037.0007) is also known, consisting of a partial rib and gastralium, and left humerus, indicating that this taxon may have reached 7 m (23 ft) in maximum body length. A number of other fragmentary specimens are also known. [1]
The holotype skeleton had 76 gastroliths, largely disc-shaped stones. All were composed of black chert and grey quartzite, the largest of which weighed 15.3 grams. [1] [2]
The describers placed Fluvionectes in Elasmosauridae, in a clade with Albertonectes , Nakonanectes , Styxosaurus , and Terminonatator , which by definition places it in the Elasmosaurinae subfamily. [1]
Fluvionectes appears to have been a freshwater and brackish water animal based on its discovery from a non-marine to paralic sedimentary unit. Both the holotype and the largest specimen (TMP 2009.037.0007) were found in brackish estuarine deposits, but a number of other specimens were found in nearby freshwater fluvial deposits. This is significantly different in contrast to most elasmosaurs which were oceanic. [1]
Other fossils associated with the holotype specimen included the turtle Kimurachelys slobodae and the rhinobatoid ray Myledaphus. Three dinoflagellates were also found, suggesting a marine influenced environment, although their low abundance and diversity suggests that it was not an open-marine environment. [1]
The holotype was discovered alongside many pieces of coalified wood, which is interpreted as the carcass having been caught in a log jam. [2]
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