Sagenopteris trapialensis

Sagenopteris trapialensis
Temporal range: Early Jurassic
Complete Sagenopteris trapialensis leaf, venation obscured
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Division: †Pteridospermatophyta
Order: †Caytoniales
Family: †Caytoniaceae
Genus: †Sagenopteris
Species:
†S. trapialensis
Binomial name
†Sagenopteris trapialensis
Elgorriaga, Escapa et Cuneo, 2019

Sagenopteris trapialensis are leaves of extinct species of seed fern from Chubut, Patagonia Argentina.[1] At the moment, S. trapialensis is based on impression fossils found in the Early Jurassic Lonco Trapial Formation near Paso del Sapo, Chubut Province.

Description

Sagenopteris trapialensis comprises palmately arranged leaves with 4 ovate to obovate leaflets with anastomosing venation. The central leaflets are almost symmetrical, whereas the lateral ones are markedly asymmetrical. Various types of anastomoses are present, and dichotomies are simple. Leaves of various sizes and forms were found, ranging from less than 5 mm. and up to 80 mm long.

References

  1. ^ Elgorriaga, A.; Escapa, I. H.; Cúneo, R. (2019). "Southern Hemisphere Caytoniales: vegetative and reproductive remains from the Lonco Trapial Formation (Lower Jurassic), Patagonia". Journal of Systematic Palaeontology. 17 (17): 1257–1275. Bibcode:2019JSPal..17.1477E. doi:10.1080/14772019.2018.1535456. S2CID 92287804.


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