QUÉ SIGNIFICA GASTRAEA EN INGLÉS
Urmetazoan
El Urmetazoan es el hipotético último antepasado común de todos los animales. Era indudablemente marina, pero más allá de esto su forma es difícil de determinar; Se han planteado cinco hipótesis diferentes y es difícil discriminar entre ellas porque las relaciones de los filamentos animales no están completamente resueltas. Los biólogos consideran que los animales han evolucionado a partir de un eucariota flagelado. Sus parientes vivos conocidos más cercanos son los choanoflagelados, flagelados con collar que tienen una morfología similar a los coanocitos de ciertas esponjas. Los estudios moleculares colocan a los animales en un supergrupo llamado opisthokonts, que también incluyen los choanoflagelados, los hongos y algunos pequeños protistas parásitos. El nombre proviene de la ubicación posterior del flagelo en las células móviles, como la mayoría de los espermatozoides animales, mientras que otros eucariotas tienden a tener flagelos anteriores.
definición de gastraea en el diccionario inglés
La definición de gastraea en el diccionario es una forma primitiva de doble pared parecida a un saco cuya existencia es hipotética por Haeckel; La teoría de gastraea supone que todos los animales descienden de esta forma primitiva.
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10 LIBROS DEL INGLÉS RELACIONADOS CON «GASTRAEA»
Descubre el uso de
gastraea en la siguiente selección bibliográfica. Libros relacionados con
gastraea y pequeños extractos de los mismos para contextualizar su uso en la literatura.
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
...
NOTICIAS EN LAS QUE SE INCLUYE EL TÉRMINO «GASTRAEA»
Conoce de qué se habla en los medios de comunicación nacionales e internacionales y cómo se emplea el término
gastraea en el contexto de las siguientes noticias.
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, Sep 08»