Invertibrate Exam Flashcards
Innovations in animal evolution
- Body Symmetry
- Tissues
- Body Cavities
- Embryonic development
Acoelomate
No cavity - organs embedded in mesoderm
Pseudocoelomate
False cavity - filled with fluid & suspended organs.
Coelomates
True cavity - better control since more muscles present .
Parazoa
General lack of any definite symmetry (sponges).
Eumetazoa
Habe bilateral symmetry.
What are the 3 classes of Porifera?
Calcarea
Demospongiae
Hexactindellia
Mesophyl
A gelatinous, protein-rich matrix found between the choanocyte layer and the epithelial layer of the body of a sponge.
Spongin
Protien made by sponges as endoskeleton. 90% of sponges use spongin. (10% use collagen)
Metamerism
Evolution of head & brain area in the anterior end of animals.
Nephridia
A tubule that open to the exterior of an invertebrate and acts as an organ of excretion or osmoregulation. Typically has ciliated or flagellated cells and absorptive walls.
What are the 5 classes of Porifera?
Hydrozoa Scyphozoa (jellyfish) Cubazoa (box jellyfish) Anthozoa (corals and anemones) Staurozoa (star jellies)
Phylum Platyhelminths –> Classes
Class Turbellaria
Subphylum Neodermata
- Class Trematoda
- Class Cercomeromorpha
What are the classes of Annelida?
Clitellata
- Leaches
- Earthworms
Poluchaeta
Phylum Cnidaria –> Class hydrozoa
- Majority of marine species
- Predators
Phylum Cnidaria –> Class cubozoa
- All marine
- medusa is dominant
nematocysts are fatal
Phylum Cnidaria –> Class anthozoa
- all marine
- soft corals, anemones, sea fans, sea pens
- solitary or colonial
- no medusa
Phylum Cnidaria –> Class anthozoa –> orders
Hexacorallia (anemones & hard corals)
Octocorallia (soft corals)