Webc) undergo metamorphosis and those that don't. Crustaceans: a) include animals such as spiders and scorpions. b) include animals such as the nautilus and squid. c) have a hard, external skeleton composed of chitin. d) have radial body symmetry. c) have a hard, external skeleton composed of chitin. Webnoun Zoology. any of the nonvertebrate chordates, as the tunicates, cephalochordates, and hemichordates. There are grammar debates that never die; and the ones highlighted in …

Hemichordate neurulation and the origin of the neural tube

WebThe three major clades of deuterostomes are Chordata (e.g. vertebrates ), Echinodermata (e.g. starfish ), and Hemichordata (e.g. acorn worms ). Together with Protostomia and their out-group … WebNotochord, when present, restricted to tail; body covered with tunic, but sometimes only cuticle; atrium, absent in Appendicularia, dorsal and often paired in embryonic development; heart present; generally sessile (attached) as adults; see below Tunicates. Class Ascidiacea (sea squirts) Sessile; benthic; solitary or colonial within a common tunic. qilive watch 2

Chordate Definition, Characteristics, & Facts Britannica

Webnoun. hemi· chor· date ˌhe-mi-ˈkȯr-dət. -ˈkȯr-ˌdāt. : any of a phylum (Hemichordata) of wormlike marine animals (such as an acorn worm) that have in the proboscis an … WebThe notochord is a long, rodlike structure that develops dorsal to the gut and ventral to the neural tube. The notochord is composed primarily of a core of glycoproteins, encased in a sheath of collagen fibers wound into … Web: any of a phylum (Hemichordata) of wormlike marine animals (such as an acorn worm) that have in the proboscis an outgrowth of the pharyngeal wall which superficially resembles the notochord of chordates Word History Etymology New Latin Hemichordata, from hemi- + Chordata chordates First Known Use 1885, in the meaning defined above Time Traveler qillbot words english