Invertebrate Diversity 1

Invertebrate Diversity 1 - Invertebrate Diversity 1 What...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Invertebrate Diversity 1 What are Invertebrates? - Invertebrates: animals that lack a backbone - Majority of animal phyla are invertebrates (34 of 35 phyla)! - Inverts make up >95% of animal species - Arthropods represent >85% of animals species Important evolutionary characters - Symmetry (radial or bilateral) - True tissues - Tissue layers (diplo/tripoblastic) - Digestive tract (complete/incomplete) - Circulatory system (open/closed) - Coelm (a/pseudo/coelm) Super-phylum Porifera: Sponges - Asymmetric, no true tissues/ organs - Suspension feeders - Spicules (calcium carbonate or silica); provide structural support - Cell types: choanocytes, amoebocytes - Diploblastic; layers separated by gelatinous mesohyl Phylum Cnidaria: Corals and JellyFsh - Organ System - Nervous system - Contractile tissues - Digestive system - Cnidos means “stinging nettle”, cnidocyte contains nematocyst
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
- Two body plans: Polyp (sessile) and medusa (mobile); most alternate body plans - Gastrovascular cavity: functions in both digestion and circulation
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/21/2011 for the course BSC 2010 taught by Professor Bowes during the Spring '08 term at University of Florida.

Page1 / 4

Invertebrate Diversity 1 - Invertebrate Diversity 1 What...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online