نتایج جستجو برای: middle eocene
تعداد نتایج: 158502 فیلتر نتایج به سال:
Pinnularia is an ecologically important and species-rich genus of freshwater diatoms (Bacillariophyceae) showing considerable variation in frustule morphology. Interspecific evolutionary relationships were inferred for 36 Pinnularia taxa using a five-locus dataset. A range of fossil taxa, including newly discovered Middle Eocene forms of Pinnularia, was used to calibrate a relaxed molecular clo...
Several mechanisms have been proposed to explain the high levels of plant diversity in the Neotropics today, but little is known about diversification patterns of Neotropical floras through geological time. Here, we present the longest time series compiled for palynological plant diversity of the Neotropics (15 stratigraphic sections, 1530 samples, 1411 morphospecies, and 287,736 occurrences) f...
A new taxon of swift-like birds is described from the Middle Eocene of Messel (Germany). It is tentatively assigned to the extinct family Jungornithidae and exhibits a completely unexpected feathering, which contrasts sharply with that of recent swifts. The short and rounded wings clearly show that it was not adapted to gliding, but might have caught its prey by sallying flights from a perch. T...
Middle Eocene Cassidae, Charoniidae, Cymatiidae and Personidae species are described illustrated from the Hungarian Paleogene Basin. Pseudosassia n. gen. eight new designated: Cassis kalmani sp., gurdoni traceyi Monoplex s.l. szakonyii Cymatiella dulaii Parasassia vargai Protoplex ? zsoldosi Personopsis merlei sp. Genus Semiranella De Gregorio, 1880 is assigned to family Charoniidae. Sconsia cy...
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