1 / 4

Lecture 5 Animal Evolution – The Invertebrates

Echinoderms, meaning "spiny-skinned," are coelomate animals distinguished by their unique anatomy, including spines, spicules, and plates of calcium carbonate that serve defensive functions. This diverse group, including starfish, sea urchins, and sea cucumbers, mainly exhibits radial symmetry, with some showing bilateral traits. Echinoderms possess a decentralized nervous system, allowing them to respond to stimuli without a centralized brain. Their active predatory lifestyle is aided by tube feet, fluid-filled structures critical for locomotion, burrowing, and gripping surfaces, integral to their water vascular system.

kert
Télécharger la présentation

Lecture 5 Animal Evolution – The Invertebrates

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Lecture 5Animal Evolution – The Invertebrates

  2. Echinoderms • Means spiny-skinned. • Coelomate animals with spines, spicules/plates of calcium carbonate in the body wall-serve as defensive functions. • E.g Star fishes, sea urchins, sea cucumbers • Most have well-developed internal skeleton. • Adults are radial with some bilateral symmetry. • Active preadtors

  3. Echinoderms • Adults are brainless but with decentralized nervous system which responds to food, predators and so forth coming in any directions. • Have tube-feet. • Tube-feet: • fluid-filled, muscular structures & sucker-like adhesive disks. • used for walking, burrowing, clinging to rocks, gripping clams/snails. • components of a water-vascular system unique to echinoderms.

  4. Tube feet

More Related