Biology:Eoginkgoites
| Eoginkgoites | |
|---|---|
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Order: | †Bennettitales |
| Family: | †Williamsoniaceae |
| Genus: | †Eoginkgoites Bock 1952 |
| Type species | |
| Eoginkgoites sectoralis Bock 1952[1]
| |
| Species | |
| |
Eoginkgoites is an extinct form genus of bennettitalean leaves from the Late Triassic of North America.[1][2] Despite its palmate (hand-shaped) appearance similar to some early ginkgo species, it belongs to a different gymnosperm order, the Bennettitales. The leaf is deeply segmented into five to seven narrow, club-shaped lobes (pinnae or leaflets) which twist around a very short rhachis. This leads to an overall fan-shaped leaf (similar to a ginkgo but much more strongly segmented) situated at the end of a long petiole (leaf stalk). The leaf has paracytic stomata (with subsidiary cells laterally flanking the guard cells) and veins which strongly branch and lead to a marginal vein at the edge of each leaflet. These structural traits are all shared with benettitaleans.[1][2] Williamsonia carolinensis, an ovule-bearing bennettitalean cone, has been found closely associated with Eoginkgoites leaves, seemingly confirming its benettitalean identity.[3]
References
- ↑ 1.0 1.1 1.2 Ash, Sidney R. (1976). "The Systematic Position of Eoginkgoites" (in en). American Journal of Botany 63 (10): 1327–1331. doi:10.1002/j.1537-2197.1976.tb13218.x. ISSN 0002-9122. https://onlinelibrary.wiley.com/doi/10.1002/j.1537-2197.1976.tb13218.x.
- ↑ 2.0 2.1 Axsmith, Brian J.; Taylor, Thomas N.; Delevoryas, Theodore; Hope, Robert C. (1995). "A new species of Eoginkgoites from the Upper Triassic of North Carolina, USA" (in en). Review of Palaeobotany and Palynology 85 (3–4): 189–198. doi:10.1016/0034-6667(94)00131-3. https://linkinghub.elsevier.com/retrieve/pii/0034666794001313.
- ↑ Pott, Christian; Axsmith, Brian J. (2015). "Williamsonia carolinensis sp. nov. and Associated Eoginkgoites Foliage from the Upper Triassic Pekin Formation, North Carolina: Implications for Early Evolution in the Williamsoniaceae (Bennettitales)" (in en). International Journal of Plant Sciences 176 (2): 174–185. doi:10.1086/679471. ISSN 1058-5893. https://www.journals.uchicago.edu/doi/10.1086/679471.
Wikidata ☰ Q113543862 entry
 |  |
