السهيم حيوان. معلومات عن حيوان السهيم

	Anatomy of Branchiostoma lanceolatum amphioxus showing external anatomyand segmented muscles
Cross section of an adult Branchiostoma through the pharyngeal region	Anatomy of Branchiostoma lanceolatum amphioxus showing internal anatomy

معلومات عن السهيم

From Gergus and Schuett 1997 Labs for Vertebrate Zoology.