Circumpolles

Circumpolles; Temporal range: Triassic to Cretaceous PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Plantae
(unranked):	Gymnospermae
Genus:	Circumpolles

Circumpolles is a gymnosperm pollen type that is important in biostratigraphy and paleoenvironmental reconstruction.^[1] It characterizes the time between the middle Triassic to the middle Cretaceous Periods. This pollen has a unique morphology: it has a circular, equatorial colpus, which divides the pollen grain into two hemispheres. Circumpolles is also unique as it is the only gymnosperm with well developed columellae.^[2]

Circumpolles is a synonym of Classopollis. Classopollis were produced by shrubs that tolerated semiarid conditions, and Classopollis is correlated with evaporites and are therefore associated with desert basins, but the shrubs may have also lived in xeric uplands.^[3]

References[]

^ Pocock, S.A.J.; Vasanthy, G; Venkatachala, B.S (October 30, 1990). "Pollen of circumpolles — An enigma or morphotrends showing evolutionary adaptation". Review of Palaeobotany and Palynology. 65 (1–4): 179–193. doi:10.1016/0034-6667(90)90069-U.
^ 1925-, Traverse, Alfred (1988). Paleopalynology. Unwin Hyman. ISBN 978-0045610013. OCLC 17674795.CS1 maint: numeric names: authors list (link)
^ SRIVASTAVA, SATISH K. (October 1976). "The fossil pollen genus Classopollis". Lethaia. 9 (4): 437–457. doi:10.1111/j.1502-3931.1976.tb00985.x. ISSN 0024-1164.

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[1] Pocock, S.A.J.; Vasanthy, G; Venkatachala, B.S (October 30, 1990). "Pollen of circumpolles — An enigma or morphotrends showing evolutionary adaptation". Review of Palaeobotany and Palynology. 65 (1–4): 179–193. doi:10.1016/0034-6667(90)90069-U.

[2] 1925-, Traverse, Alfred (1988). Paleopalynology. Unwin Hyman. ISBN 978-0045610013. OCLC 17674795.CS1 maint: numeric names: authors list (link)

[3] SRIVASTAVA, SATISH K. (October 1976). "The fossil pollen genus Classopollis". Lethaia. 9 (4): 437–457. doi:10.1111/j.1502-3931.1976.tb00985.x. ISSN 0024-1164.

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