At the phyletic
level, biodiversity is greater in the marine than in the terrestrial, freshwater, or symbiotic realms, with several phyla being exclusively endemic to the oceans (Grassle et al.
Our goal is to assess the potential value of these characteristics in taxonomic and phyletic
Eldredge, "Punctuated Equilibria: An Alternative to Phyletic
Gradualism" in T.
The gut flora of vertebrates and invertebrates extends across phyletic
lines and represents one of the most widespread and ancient of symbioses.
Niles Eldredge & Stephen Jay Gould, Punctuated Equilibria: An Alternative to Phyletic
Gradualism, in MODELS IN PALEOBIOLOGY 82-115 (J.
13) Whole Cell MALDI Mass Spectrometry for the Rapid Characterisation of Bacteria; A Survey of Applications to Major Phyletic
Lines in Microbial Kingdom.
analysis by Paterson & Edgecombe (2006) has placed Estaingia close to Ellipsocephalus, and Paterson & Brock (2007) place the Estaingiidae as a family of the Ellipsocephaloidea.
antennomonstrum and the 2 above mentioned genera evolved independently and, therefore, this similarity does not truly indicate a phyletic
relationship between these taxa.
The first significant contribution to understanding of xylem evolution was that of Bailey and Tupper (1918), who hypothesized a phyletic
shortening of fusiform cambial initials.
The possibility that it evolved independently or that it re-appeared repeatedly in adults of small African barbins, and that therefore those species possessing it may not form a phyletic
lineage, apparently has not been considered before now.
The comparative morphology of the fern gametophyte can be of service in understanding different phyletic
groups (Bower, 1923-1928; Stokey, 1951).
While punctuated equilibrium (PE) reflected in the fossil record is a strong negative evidence to the underlying principle of phyletic
gradualism (PG) enshrined in the evolutionary theory, the phenomenon of cell-directed mutagenesis challenges another tenet of the theory, namely, the requirement of stochastic mutations produced by extra-cellular agents to create heritable changes in the organism.