Palissya

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This article is about extinct conifer. For the angiosperm with a junior synonym of the same name, see Necepsia.

Palissya
Temporal range: Rhaetian–Aptian
Scientific classification e
Kingdom: Plantae
Clade: Tracheophytes
(unranked): Gymnosperms
Division: Pinophyta
Class: Pinopsida
Order: †Palissyales
Family: †Palissyaceae
Genus: †Palissya
Endlicher, 1847
Species

See text

Palissya is an extinct genus of conifer, known from the Late Triassic to the Early Cretaceous. The cone of Palissya is noted for its unusual construction, which is borne on a large bract (modified leaf), and consists of two parallel rows of ovules that run along the midline of the adaxial surface of the bract which are encased in cup-like structures formed by scales. The bracts are helically arranged around an axis, forming a compound catkin-like structure. The seeds are thin-walled were likely only viable for a short period of time, and were likely adapted to wind dispersal. Palissya has been considered in some aspects to be similar to some Paleozoic Voltziales, as well as Taxaceae and Podocarpaceae. Most leaves assigned to the genus do not belong to the same plant as the conifer cone. The specimens from the Middle Jurassic of Yorkshire are associated with Elatocladus like leaves. Several species that were formerly considered part of the genus have been moved over to the separate genus . Palissya first appeared in the Northern Hemisphere during the latest Triassic (Rhaetian) and spread to Eastern Gondwana during the Middle Jurassic. The youngest known records of Palissya in the Northern Hemisphere are from the Middle Jurassic, but Palissya persisted in Eastern Gondwana into the Early Cretaceous, with the youngest records being from the Aptian.[1]

Species[]

After[1]

Species Authority Country Age
P. hunanensis Wang 2012  China (Hunan) Late Triassic (Rhaetian)
P. sphenolepis (Braun 1843) Nathorst 1908 emend.

Florin 1958

 Germany (Franconia)

 Sweden (Stabbarp)

 Poland[2]

 Canada[2]

Late Triassic-Early Jurassic (Rhaetian-Hettangian)
P. harrisii C.R. Hill ex

Pattemore & Rozefelds

 England (Yorkshire) Middle Jurassic (Aalenian)
P. bartrumii Edwards 1934  New Zealand Middle Jurassic (Callovian) ?Late Jurassic (?Tithonian)
P. elegans Parris et al. 1995  Australia (Victoria) Early Cretaceous (Valanginian)
P. tillackiorum Pattemore & Rozefelds, 2019  Australia (Queensland) Early Cretaceous (Valanginian)
Palissya sp. (Koonwarra) N/A  Australia (Victoria) Early Cretaceous (Aptian)
P. antarctica Cantrill 2000  Antarctica (Antarctic Peninsula) Early Cretaceous (Aptian)

References[]

  1. ^ a b Pattemore, Gary A.; Rozefelds, Andrew C. (2019-12-01). "Palissya – absolutely incomprehensible or surprisingly interpretable: a new morphological model, affiliations and phylogenetic insights". Acta Palaeobotanica. 59 (2): 181–214. doi:10.2478/acpa-2019-0015. ISSN 2082-0259.
  2. ^ a b Van Konijnenburg-Van Cittert, Johanna H.A.; Pott, Christian; Schmeißner, Stefan; Dütsch, Günter; Kustatscher, Evelyn (2021-05-01). "The Rhaetian flora of Wüstenwelsberg, Bavaria, Germany: Description of selected gymnosperms (Ginkgoales, Cycadales, Coniferales) together with an ecological assessment of the locally prevailing vegetation". Review of Palaeobotany and Palynology. 288: 104398. doi:10.1016/j.revpalbo.2021.104398. ISSN 0034-6667.
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