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Cordate. Chordata este o încrengătură de animale ce posedă coardă dorsală. Încrengătura include acraniatele, ciclostomatele, peștii, amfibienii, reptilele, păsările și mamiferele . Deși sunt foarte diverse, cordatele posedă caracteristici comune. Toate cordatele au schelet axial, intern.
Figure 29.5 Urochordate anatomy. (a) This photograph shows a colony of the tunicate Botrylloides violaceus. (b) The larval stage of the tunicate possesses all of the features characteristic of chordates: a notochord, a dorsal hollow nerve cord, pharyngeal slits, an endostyle, and a post-anal tail. (c) In the adult stage, the notochord, nerve ...
Categoría:Chordata. Categoría. : Chordata. Apariencia. Ayuda. El artículo principal de esta categoría es: Chordata. Wikimedia Commons alberga una categoría multimedia sobre Chordata. Wikispecies tiene un artículo sobre Chordata.
Figure 29.1.4 29.1. 4: The lancelet, like all cephalochordates, has a head. Adult lancelets retain the four key features of chordates: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail. Water from the mouth enters the pharyngeal slits, which filter out food particles. The filtered water then collects in the atrium ...
Chordata. Los cordaos (nome científicu, Chordata) son un tipu zoolóxicu carauterizáu pola presencia d'una cuerda dorsal o notocordiu, durante tou'l desendolcu o en dalguna de les fases. Hai tres subtipos: vertebraos, urocordaos y cefalocordaos . Árbol filoxenéticu:
According to a long-standing theory, the origin of chordates may be found in transformed larvae of sea-squirts ( tunicates ). Adult tunicates are sessile, but their larvae are motile, and have some features found in early vertebrates. The process of paedomorphosis, where juvenile features are retained in the adult, is the proposed mechanism.
The phylum chordata is named for the notochord, a longitudinal, flexible rod between the digestive tube and the nerve cord; in vertebrates, this is the spinal column. The chordates are also characterized by a dorsal nerve cord, which splits into the brain and spinal cord. Chordata contains two clades of invertebrates: Urochordata (tunicates ...
