Large and Mainly Unnoticed: The First Lower Tithonian Record of a Suspension-Feeding Pachycormid from Southern Gondwana
| Autor: | Soledad Gouiric-Cavalli |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
010506 paleontology Pachycormiformes Osteology biology Neopterygii Paleontology biology.organism_classification 010603 evolutionary biology 01 natural sciences Gill raker Gondwana Leedsichthys Laurasia Mesozoic Ecology Evolution Behavior and Systematics Geology 0105 earth and related environmental sciences |
| Zdroj: | Ameghiniana. 54:283-289 |
| ISSN: | 1851-8044 0002-7014 |
| DOI: | 10.5710/amgh.16.11.2016.3029 |
| Popis: | A large fossil specimen could easily go unnoticed, especially when the specimen osteology is not well known, is usually represented by fragmentary material and has a sparsely ossified skeleton resulting in low preservation potential. This is particularly true for the suspensionfeeding Pachycormiformes, a clade of actinopterygians. This work provides the description of a complete gill raker recovered from the Upper Jurassic (lower Tithonian) levels of the Vaca Muerta Formation at Cerro Lotena, Neuquen Province, southwestern Argentina. The specimen is referred to the suspension-feeding pachycormid, Leedsichthys, based on similarities in size and shape morphology of the gill raker stalk, the shape of the gill raker base and for having similar morphology of the fimbriae (growing tongue-like distally). Although suspension-feeding pachycormids are known mainly from Laurasia, some remains were also recovered from Gondwana. The lower Tithonian Leedsichthys record extends the geographic and stratigraphic... |
| Databáze: | OpenAIRE |
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