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Chapter 28: Invertebrates - Coggle Diagram
Chapter 28: Invertebrates
Introduction
~95% of All Animal Species
~35 Phyla
Mostly Aquatic
Freshwater or Marine
Exception
Arthropods Have Many Land Species
Size Varies
Very Small < 2mm
Very Large > 12m
Basal Animals
Porifera (Sponges)
Aquatic, Mostly Marine
Lack True Symmetry
Sessile as Adults
Filter Feeders
Pass Water Across Structures That Trap Tiny Food Bits
Choanocytes Create Currents to Trap & Ingest Food (Phagocytosis)
Amoebocytes Distribute Food
All Digestion Intracellular
Lack True Tissues
All Cell Processes Occur at Cellular Level
No Neurons or Muscle Cells
Cell Types Can Change Roles
Spicules & Spongin
Body Supported by Hard Spicules & Spongin Protein Fibers
Made by Amoebocytes in Mesohyl
Reproduction
Fragmentation
Sexually
Hermaphroditic
Male or Female at Different Times
No Gonads
Gametes Form in Mesohyl
Flagellated Larvae Disperse & Settle
Basal Eumetazoans
Cnardia
Radial Symmetry
Aquatic
Sessile Polyp
Sit & Wait Carnivores
Stinging Tentacles Around Central Mouth Catch Prey With Cnidocytes
Sac-Like Body
Gastrovascular Cavity
Mouth & Anus Opening to Digestive Sac
Extracellular & Intracellular Digestion
Cavity Distributes Nutrients to Entire Body
Diploblastic
Mesoglea Gel Between Tissue Layers
Direct O2 & CO2 Exchange Between Cells & Water
Metabolic Waste Easily Diffuses Out
No Mesoderm
Contractile Cells
Epidermis & Gastrodermis
Loosely Coordinated by Neurons in Simple Nerve Net
Not True Muscle Cells
Drifting Medusa