Zoology for UPSC and State PSC exams
Feature Urochordates Cephalochordates Examples Ascidia, Salpa, Doliolum Amphioxus (Branchiostoma) Adult Sedentary Free swimming Segmentation Absent Present Notochord Absent in adult Present Nerve Cord Absent in adult Present Coelom Absent Present…
Metamorphosis is a change from the juvenile to adult stage in which larval stage is quite different fromthe adult stage.In retrogressive metamorphosis the larva possesses advanced characters which are lost…
Ametabolous(No metamorphosis) Newly hatched creature looks exactly like an adult except for size and development of spine and setae.e.g. Silverfish and Spring Tails. Hemimetabolous(Incomplete metamorphosis) Immature stages are the nymphs…