1. Invertebrates

2. Introduction Invertebrates lack a spinal column
Account for 98% of known animal species
Classification of these organisms is extremely complex and constantly changing

3. Vocab terms Spicules –needle-like structures
in Porifera – part of the skeleton
in nematoda – reproductive structures
Nematocysts –stinging cell found in Cnidaria
Gastrovascular cavity – body cavity in Cnidaria that digests food and transports nutrients through body. Has one opening out of the animal that food comes in and out of.

4. Vocab terms Acoelomate – organism lacking a colon
Complete digestive tract – digestive system has two openings
Pseudocoelom – a fluid filled body cavity that surrounds the internal organs
Pseudocoelomate – an organism with a three-layered body and a pseudocoelom
Setae – stiff, hair-like structure
Close circulatory system – blood flows through blood vessels (like mammals)
Open circulatory system – Body cavity is filled with blood, no distinct blood vessels

5. Vocab terms
Hydrostatic Skeleton – a skeleton composed of a fluid filled body cavity
Mantle – the dorsal body wall of molluscs that cover the digestive and reproductive organs and aids in movement.
Pedipalps – Arthropoda subphylum Chelicerata, the second pair of appendages of the prosoma in the subphylum Chelicerata.
Chelicerae – the the mouthparts Arthropoda subphylum Chelicerata

6. Day 1 Dissections Ascaris lumbricoides (giant roundworm) Grasshopper
Due Next time:
No assignments due
Quiz over O through S terms

7. Day 2 Dissections Grasshopper Squid Due Next time:
Invertebrate Questions
STUDY FOR MIDTERM!