1 / 10

Echinodermata

Echinodermata. A phylogeny can help us do lots more than simply study evolutionary history. It also helps us know what traits are shared by different but related groups of organisms.

seoras
Download Presentation

Echinodermata

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. Echinodermata

  2. A phylogeny can help us do lots more than simply study evolutionary history. It also helps us know what traits are shared by different but related groups of organisms. 1: Multicellular2: Land plants3: Vascular plants4: Seed plants5: Symmetry and tissues6: Bilateral symmetry, coelom, and nervous system7: Deuterostome development8: Molting of exoskeletons9: Trochophore larva

  3. Adults exhibit pentaradial symmetry, but the larvae are bilaterally symmetrical • Echinoderms are considered deuterostomes, anus formed first • Lack cephalization, have few sensory organs • Have 2 sides: oral-the side with the mouth, aboral-the side without the mouth

  4. The water vascular system aids in locomotion, feeding, attachment, respiration • Water enters through the madreporite and moves through the organism to the arms and tube feet • Tube feet fill with water and help the organism grab surfaces and pull themselves along • Some species have regenerative tissue, they can re-grow limbs

  5. Class: CrinoideaSea lilies and feather stars • This class attaches to a substrate with a stalk • Appx 700 extant species

  6. Class: AsteroideaSea stars • Arms radiate from a central disc, but are not distinct from it • Madreporite and anus are on aboral side • Move with tube feet

  7. Class: OphiuroideaBrittle Stars • Their flexible arms branch from a small central disc • Madreporite is on oral side • Mouth and anus are the same opening • The aboral surface of the disc is protected by plates called sheilds

  8. Class: EchinoideaSea urchins and sand dollars and sea biscuits • Most are free moving but some bore into rock • Tube feet bring food into their mouths • Their teeth are arranged into a structure known as Aristotle’s Lantern

  9. Class: HolothuroideaSea cucumbers • When threatened, they can expel their intestines, which are regenerated later

More Related