The dynamics of stem and crown groups

Cambrian Fossil Record and the Origin of the Phyla1

Within the euarthropods themselves, considerable progress has also been made in sorting out the stem group of the crustaceans (e.g.,Walossek, 1999) and some of ...

The two phases of the Cambrian Explosion | Scientific Reports

Even when highly problematic, all extinct taxa must have stem- or crown group relationships to extant taxa. A crown group is a monophyletic ...

Rapid morphological evolution in placental mammals post-dates the ...

This result supports a Late Cretaceous origin of crown placentals with an ordinal-level adaptive radiation in the early Paleocene.

A crown-group cnidarian from the Ediacaran of Charnwood Forest, UK

The projections in the crown bear greatest similarity to tentacles of living animals, but are preserved as a compound impression rather than as ...

How deep is the conflict between molecular and fossil evidence on ...

Stem lineage: the evolutionary line connecting a crown group with its common ancestor with the most closely related living group (sister group).

Pollinivory and the diversification dynamics of bees - Danforth Lab

diversification dynamics of bees. Biol ... stem and crown ages are available). Four groups did not have crown ages and are represented by square symbols.

Lizard and snake stem group - the transitional fossils

No conclusions can be drawn about the duration of the squamate stem-to-crown transition as the only known member of the stem group is younger than the oldest ...

Causes and consequences of end-Ediacaran extinction: An update

Budd, GE and Mann, RP (2020) The dynamics of stem and crown groups. Science Advances 6, eaaz1626.CrossRefGoogle ScholarPubMed. Burgess, SD ...

The dynamic adaptive landscape of cetacean body size - Cell Press

... stem delphinidans, and for Orcaella (Figures 3 and S4). ... Within the baleen whales (Mysticeti), we only observed shifts within the crown group ( ...

Phylogenomic analyses of echinoid diversification prompt a re ...

This nomenclature refers to the dynamic evolutionary history of the ... crown group echinoids as members of the stem group. Given this ...

Temporal Dynamics of Tree Crown Fractal Dimension in Two ...

In broad terms, there are four main phases recognized in the annual cyclic dynamics of crowns: foliation, stasis at maximum cover, defoliation, ...

Can anyone pls explain total group= crown group + stem ... - Reddit

Crown groups are the last common ancestor of a group of extant animals and all its living or extinct descendants (ie a clade) and the stem group refers to ...

Reconciling molecular phylogenies with the fossil record - PNAS

These methods have raised the possibility of inferring diversity dynamics for groups that lack a detailed fossil record. ... crown group (4). Thus, even ...

Publications – Donoghue Lab - University of Bristol

... Science | PDF. Diversification dynamics of total-, stem- and crown-groups are compatible with molecular clock estimates of divergence times. Beavan AJS ...

Basal area increment and growth efficiency as functions of canopy ...

Crown and canopy structurecorrelate with growth efficiency and also determine stem size and taper as described by the uniform stress principle of stem formation ...

Fossilized Molecules Reveal a Lost World of Ancient Life

At first, the stem group may have had an advantage. Oxygen levels in the atmosphere were significantly lower than they are today. Because ...

Components of the Increment Dynamics of Early and Late Wood of ...

The groups were distinguished by the evelopment of crown (original classification) and its dynamics. The stem cores were taken at a height of 1.3 m from the ...

A New Chengjiang Worm Sheds Light on the Radiation and ... - MDPI

Comparable symmetry patterns are known in numerous Cambrian stem-group or assumed crown-group priapulid worms such as Yunnanpriapulus [17], ...

Forty new specimens of Ichthyornis provide unprecedented insight ...

Forty new specimens of Ichthyornis provide unprecedented insight into the postcranial morphology of crownward stem group birds.

Google Scholar