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Hemichordata are marine deuterostome animals characterized by a soft, unsegmented body divided into three regions: proboscis, collar, and trunk. They are classified into four classes: Enteropneusta, Pterobranchia, Planctosphaeroidea, and Graptolita, with Enteropneusta and Pterobranchia being the most notable. Reproduction is primarily sexual with external fertilization, and development can be indirect with a free-swimming larva or direct in some forms.

Author
jamessokokulo
Language
EN