A new gnetalean pollen genus Chomsiipites from cretaceous deposits of the eastern mediterranean

Smirnova, S. B.

doi:10.1134/s0031030110010132

Cited by 2 publications

(1 citation statement)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These grains are comparable in general morphology to those found in association with Bicatia, but all are larger (38-52 µm). Grains of J. semistriata Schrank also have a much broader non-plicate zone bordering the aperture (Schrank 2010). Other records of polyplicate pollen from the Early Cretaceous of Gondwana, most notably from the Crato Formation (Osborn et al 1993), are generally of the ephedroid type that lack a colpus.…”

Section: Comparison To Dispersed Polyplicate-monocolpate Pollen From mentioning

confidence: 99%

Welwitschioid diversity in the Early Cretaceous: evidence from fossil seeds with pollen from Portugal and eastern North America

Friis

Pedersen

Crane

2014

Grana

View full text Add to dashboard Cite

Bicatia gen. et sp. nov. from the Early Cretaceous of the Northern Hemisphere is described based on three species of dispersed seeds: Bicatia costata from the Juncal and Famalicão localities (western Portugal) and the Kenilworth locality (eastern North America), B. juncalensis from the Juncal locality, and B. rugosa from the Puddledock locality (eastern North America). Seeds of B. costata and B. rugosa are known from both lignitised (Juncal, Kenilworth, Puddledock) and charcoalified specimens (Famalicão, Puddledock), whereas seeds of B. juncalensis are known only from lignitised material (Juncal). All three species have the same characteristic chlamydospermous organisation seen in the wide range of other Early Cretaceous seeds that have been assigned to the Bennettitales-Erdtmanithecales-Gnetales (BEG) group. However, the species of Bicatia differ from all previously described BEG seeds in having a disymmetrical and flattened seed envelope with more or less distinct lateral wings. All three species are also closely associated with polyplicate pollen grains that have a prominent distal colpus. Pollen grains of this kind are very similar to those of extant Welwitschia. The combination of seed and pollen features seen in Bicatia provides the strongest documentation so far of Welwitschia-like plants in the Northern Hemisphere during the Early Cretaceous.

show abstract

Section: Comparison To Dispersed Polyplicate-monocolpate Pollen From mentioning

confidence: 99%

Welwitschioid diversity in the Early Cretaceous: evidence from fossil seeds with pollen from Portugal and eastern North America

Friis

Pedersen

Crane

2014

Grana

View full text Add to dashboard Cite

show abstract

Palynological Analysis of Amber‐Bearing Clay from the Lower Cretaceous of Central Lebanon

Azar

Dejax

Masure

2011

Acta Geologica Sinica (Eng)

View full text Add to dashboard Cite

An amber‐bearing lignitic layer of sandy clay from the Lower Cretaceous of Central Lebanon (Mderej‐Hammâna) yielded a well‐preserved, moderately variegated palynoflora, which origin is mixed between land plants and marine microflora. Its detailed analysis led to fulfill its inventory, to propose a paleoenvironmental reconstruction, and to draw the paleoclimate which prevailed over the region: an estuarian area under a rather humid, temperate climate; a variety of ferns grew near the shore‐side and in the inward land. A tiny piece of amber containing angiospermous pollen grains of stratigraphical interest allows a precise dating. The marine microflora, poorly diversified, includes chitinous foraminifer linings and dinoflagellate cysts, among which Early Aptian guide taxa are present; their occurrence slightly narrows the stratigraphical range indicated by some palynological taxa which are related to land plants.

show abstract

A new gnetalean pollen genus Chomsiipites from cretaceous deposits of the eastern mediterranean

Cited by 2 publications

References 3 publications

Welwitschioid diversity in the Early Cretaceous: evidence from fossil seeds with pollen from Portugal and eastern North America

Welwitschioid diversity in the Early Cretaceous: evidence from fossil seeds with pollen from Portugal and eastern North America

Palynological Analysis of Amber‐Bearing Clay from the Lower Cretaceous of Central Lebanon

Contact Info

Product

Resources

About