Ticoa Temporal range:
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Scientific classification | |
Kingdom: | |
(unranked): | |
(unranked): | |
Order: | |
Genus: | †Ticoa S.Archang.
[1]
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Species | |
|
Ticoa is an extinct genus originally assigned to the Cycadales [1] from the Early Cretaceous of Argentina, Chile, and Antarctica. Other authors view this genus as a member of the polyphyletic " seed ferns". [2]
The genus was erected by Sergio Archangelsky based on material from the Anfiteatro de Ticó formation. [1] The genus first comprised two species, T. harrisii and T. magnipinnulata, with T. lamellata being described from the Bajo Grande locality in Patagonia, Argentina. [3] The species T. magallanica was described from the Springhill formation in Chile. [4] T. jeffersonii was described from Hope Bay in Antarctica. [5] T. lanceolata was described much later from the Anfiteatro de Ticó formation . [6]
Ticoa includes large, bipinnate or tripinnate leaves with pecopteroid pinnules and a robust rachis. The cuticle, either hypostomatous or amphistomatous, presents large stomata sunken in a pit formed by multiple subsidiary and encircling cells.
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Ticoa Temporal range:
| |
---|---|
Scientific classification | |
Kingdom: | |
(unranked): | |
(unranked): | |
Order: | |
Genus: | †Ticoa S.Archang.
[1]
|
Species | |
|
Ticoa is an extinct genus originally assigned to the Cycadales [1] from the Early Cretaceous of Argentina, Chile, and Antarctica. Other authors view this genus as a member of the polyphyletic " seed ferns". [2]
The genus was erected by Sergio Archangelsky based on material from the Anfiteatro de Ticó formation. [1] The genus first comprised two species, T. harrisii and T. magnipinnulata, with T. lamellata being described from the Bajo Grande locality in Patagonia, Argentina. [3] The species T. magallanica was described from the Springhill formation in Chile. [4] T. jeffersonii was described from Hope Bay in Antarctica. [5] T. lanceolata was described much later from the Anfiteatro de Ticó formation . [6]
Ticoa includes large, bipinnate or tripinnate leaves with pecopteroid pinnules and a robust rachis. The cuticle, either hypostomatous or amphistomatous, presents large stomata sunken in a pit formed by multiple subsidiary and encircling cells.
{{
cite journal}}
: Cite journal requires |journal=
(
help)