General Characters and Classification of Echinodermata in Zoology: B.Sc. 2nd Sem
B.Sc. 2
nd
Sem (Honours)
Subject: Zoology
Paper: ZC-203T
Topic:
General Characters and
Classification of Echinodermata
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General Characters of Phylum- Echinodermata:-
•
The echinoderms are exclusively marine.
•
They occur in all seas from the intertidal zone to the great depths.
•
They possess radial symmetry.
•
Body is triploblastic, coelomate with distinct oral and aboral surfaces.
•
Body shape rounded or cylindrical or star-like.
•
Presence of water vascular system or ambulacral system is the most
characteristic feature.
•
Circulatory or haemal or blood lacunar system is typically present.
•
Nervous system is primitive.
•
Sense organs are poorly developed.
•
Sexes are separate (dioecious) with few exceptions.
•
Reproduction is usually sexual, few reproduce asexually or by
regeneration.
•
Development involves larval stages which undergo metamorphosis.
Feather- Star
Feather- Star
5 different classes of
5 different classes of
Phylum Echinodermata
Phylum Echinodermata
Table: 1
Table: 1
Thank you
Echinoderms, marine animals with radial symmetry, feature a unique water vascular system. This content covers their general characteristics, five classes, and a classification table. Dr. Merina Narah from Silapathar College, Assam, presents valuable insights into the fascinating world of Echinodermata.
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Presentation Transcript
B.Sc. 2nd Sem (Honours) Subject: Zoology Paper: ZC-203T Topic: General Characters and Classification of Echinodermata Dr. Merina Narah Assistant Professor Dept. of Zoology Silapathar College Silapathar, 787059, Assam.
General Characters of Phylum- Echinodermata:- The echinoderms are exclusively marine. They occur in all seas from the intertidal zone to the great depths. They possess radial symmetry. Body is triploblastic, coelomate with distinct oral and aboral surfaces. Body shape rounded or cylindrical or star-like. Presence of water vascular system or ambulacral system is the most characteristic feature. Circulatory or haemal or blood lacunar system is typically present. Nervous system is primitive. Sense organs are poorly developed. Sexes are separate (dioecious) with few exceptions. Reproduction is usually sexual, few reproduce asexually or by regeneration. Development involves larval stages which undergo metamorphosis.
5 different classes of Phylum Echinodermata Feather- Star
