Invertebrate Animals: Characteristics and Classification
Classified in Biology
Written at on English with a size of 5.23 KB.
Porifera and Cnidarians: Structure
Porifera (sponges) and Cnidarians (anemones, corals, and jellyfish) are simple, aquatic invertebrates.
Porifera (Sponges)
- Mostly marine, some freshwater species
- Bag-shaped body with pores that communicate with the atrial cavity
- The atrial cavity connects with the exterior through the osculum
- High capacity for regeneration
Cnidarians
- Anemones, corals, and jellyfish (all marine), hydra (freshwater)
- Radial symmetry
- Soft body with a single opening surrounded by tentacles
- Stinging cells (cnidocytes)
- Gastrovascular cavity that functions as a stomach
- Carnivorous
- Two forms:
- Polyps: Tubular, bag-shaped with the opening at the top
- Medusae: Umbrella-shaped, actively swim or float in the water
Worms: Platyhelminthes, Nematodes, and Annelids
Worms... Continue reading "Invertebrate Animals: Characteristics and Classification" »