urochord

• Nom désignant un animal marin primitif au corps en forme de sac, non segmenté, caractérisé par la présence d'une corde dorsale visible au stade larvaire, ou plus précisément la corde de la larve d'un tunicier, généralement limitée à la région caudale.

A noun referring to a primitive marine animal with a saclike, unsegmented body, characterized by a urochord that is prominent in the larval stage, or specifically the notochord of a larval tunicate typically confined to the caudal region.

1. C2formalscientific

   A primitive marine animal with a saclike, unsegmented body and a prominent urochord visible in the larval stage.

   Urocordé (tunicier)

   • The urochord is a fascinating example of early chordate evolution.
   • Marine biologists study the urochord to understand the development of the backbone.
   • The larval urochord displays a distinct tail structure.

   Synonymestunicateurochordate

2. Larval notochordC2formalscientific

   The notochord of a larval tunicate, typically confined to the tail region.

   Notochorde larvaire

   • The urochord provides structural support in the larval tunicate.
   • During metamorphosis, the urochord is reabsorbed.
   • The presence of a urochord is a key characteristic of tunicate larvae.