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Il y a 2 jours · Ascidians (Phylum: Chordata, Class: Ascidiacea), or sea squirts, are the largest and most diverse class of the sub-phylum Tunicata (also known as Urochordata). They comprise approximately 3000 described species found in all marine habitats from shallow water to the deep sea.
Il y a 5 jours · We propose that the chordate ancestor possessed a mesoderm organized in an axial domain with two cell populations: a prechordal-plate like region in the anterior part (dark purple), and a ...
Il y a 3 jours · The Cambrian explosion (also known as Cambrian radiation [1] or Cambrian diversification) is an interval of time approximately 538.8 million years ago in the Cambrian period of the early Paleozoic when a sudden radiation of complex life occurred, and practically all major animal phyla started appearing in the fossil record.
Il y a 1 jour · The timeline of human evolution outlines the major events in the evolutionary lineage of the modern human species, Homo sapiens, throughout the history of life, beginning some 4 billion years ago down to recent evolution within H. sapiens during and since the Last Glacial Period . It includes brief explanations of the various taxonomic ranks in ...
Il y a 1 jour · Salamandroidea. Native distribution of salamanders (in green) Salamanders are a group of amphibians typically characterized by their lizard -like appearance, with slender bodies, blunt snouts, short limbs projecting at right angles to the body, and the presence of a tail in both larvae and adults. All ten extant salamander families are grouped ...
Il y a 4 jours · Enantiornithes. The Enantiornithes, also known as enantiornithines or enantiornitheans in literature, are a group of extinct avialans ("birds" in the broad sense), the most abundant and diverse group known from the Mesozoic era. [3] [4] [5] Almost all retained teeth and clawed fingers on each wing, but otherwise looked much like modern birds ...
Il y a 2 jours · Le clitoris, terme latin issu du Grec ancien κλειτορίς, « clef » ou « fermoir », est un organe exclusivement féminin. Il appartient au système reproducteur des amniotes mais il peut disparaître au cours du développement embryonnaire. Le clitoris est issu de la même structure que le pénis qui est donc son homologue.
