MOTS EN ANGLAIS EN RAPPORT AVEC «GASTRAEA»
gastraea
urmetazoan
hypothetical
last
common
ancestor
animals
undoubtedly
marine
beyond
this
form
difficult
determine
five
different
hypotheses
have
been
forward
discriminating
between
them
because
relationships
animal
gastraea
merriam
webster
with
audio
pronunciations
word
games
biol
primeval
larval
double
walled
according
hypothesis
haeckel
other
first
stages
theory
biology
encyclopedia
britannica
though
concepts
recapitulation
were
error
brought
attention
important
biological
questions
tracing
multicellular
origins
higher
life
forms
ernst
basis
seems
provide
reasonable
pictures
organisms
define
stomach
wiktionary
hypothetische
stammform
aller
mehrzelligen
tiere
besteht
ontogenetische
gastrulastadium
defined
yourdictionary
ancestral
flatworms
structured
like
gastrula
stage
embryology
origin
modern
latin
classical
greek
gastēr
collins
always
whose
existence
hypothesised
supposes
descended
jstor
original
unity
classes
kingdom
TENDANCES D'USAGE DU TERME «GASTRAEA»
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Tendances de recherche principales et usages générales de
gastraea
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10 LIVRES EN ANGLAIS EN RAPPORT AVEC «GASTRAEA»
Découvrez l'usage de
gastraea dans la sélection bibliographique suivante. Des livres en rapport avec
gastraea et de courts extraits de ceux-ci pour replacer dans son contexte son utilisation littéraire.
1
Progress in Invertebrate Zoology
The double-layered form, with Urmund (blastopore) and gastral cavity (
archenteron), represents the gastrula stage and is known as the hypothetical
gastraea in the Metazoan ancestor. The gastraea theory was first put forward by
Ha'ckel.
The gastraea hypothesis suggests that the primitive nature of sponges and
coelenterates lies in their persistence at this diploblastic gastrula level. An
extension of the gastraea hypothesis is that an important body cavity of most
metazoans, the ...
Monroe W. Strickberger, 2005
3
Modern Text Book of Zoology: Invertebrates
(4) Endoderm is fundamentally produced by imagination, all other methods being
secondary modifications of invagination. 2. Support. Haeckel's Gastraea Theory
about ancestry of the Metazoa is mainly based on the embryological evidence.
4
Individual Development and Evolution: The Genesis of Novel ...
But the low animal forms which constitute the ancestral line between the
unicellular amoeba and the gastraea, and further between the gastraea and the
ascidian form, can only be approximately conjectured with the aid of comparative
...
5
Invertebrate Relationships: Patterns in Animal Evolution
One variant of gastraea theories that does avoid some of the problem areas has
recently been advanced by Nielsen & N¢rrevang (1985). They suggest that a
common monociliate gastraea stock gave rise directly to Cnidaria, and also via a
...
6
The Evolution of Man (Complete)
Justasthe countless species ofthe Metazoa do actuallydevelop in the
individualfrom the simple embryonicformofthe gastrula, so they
havealldescended inpast time from thecommon stemformofthe Gastraea. In this
fact,andthe fact we have ...
Ernst Heinrich Philipp August Haeckel
Gastraea hypothesis The gastraea hypothesis was proposed by Ernst Haeckel,[2]
shortly after his work on the calcareous sponges. He proposed that this group of
sponges is monophyletic with all eumetazoans, including the bilaterians.
8
Biology Takes Form: Animal Morphology and the German ...
Those forms which were repeated in otherwise widely different types were much
more likely to represent the original state than a later interpolation. This is the
basis for Haeckel's faith in the existence of the ancient gastraea: since he found
the ...
This theory is known as the Gastraea Hypothesis. Today, the Planula Hypothesis,
a variant of the Gastraea Hypothesis, is more popular, but the problems remain
the same as for the Gastraea Hypothesis of Ernst Haeckel (figure 5.5). Using the
...
10
Ontogeny and Phylogeny
Organs or Ancestors: The Transformation of Haeckel's Heterochrony Many have
traced the demise of Haeckel's theory to the inadequacy of his gastraea — that "
lean animal-specter"3 — as a satisfactory ancestor for all metazoans; or rather to
...
ACTUALITÉS CONTENANT LE TERME «GASTRAEA»
Découvrez de quoi on parle dans les médias nationaux et internationaux et comment le terme
gastraea est employé dans le contexte des actualités suivantes.
Acoel development indicates the independent evolution of the …
a, Hypotheses based on a simultaneous evolution of mouth and anus (top) either start with a pelagic hypothetical ancestor (gastraea and ... «Nature.com, sept 08»
