Unit 2 Invertebrates Marine Animals without Backbones http
Unit 2 Invertebrates Marine Animals without Backbones
http: //www. oceanicresearch. org/edu cation/wonders/sponges. html 2
l. Sponges are invertebrate l. Invertebrate = no backbone l. Kingdom: Animalia l. Phylum: Porifera
Symmetry l. Two types l 1) Bilateral: right and left symmetry l 2) Radial: divided around a common point 4
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1. Sponges – Phylum Porifera
General Characteristics l. Distinguishing Features – collar cells l. General Habitat – benthic l. Level of organization – cellular l. Symmetry – none l. Feeding type – filter feeder l. Sessile – attached to surface
Outer surface structure l. Covered with epithelial cells and pore cells l. Pores- allow water to pass into the center of organism l. Osculum- Large opening at the top of the sponge
Inner structure l. Spicule- rigged support l. Spongin- flexible support 9
Structure l. The inner layer consists of collar cells whose function is to circulate water through the sponge. l. Between the epidermis and the collar cells are cells called amebocytes 10 9
• Amebocytes travel around distributing food and oxygen to the cells of the epidermis.
Reproduce Asexually and Sexually l. Asexual Reproduction: l 1) Budding l 2) Regeneration l 3) Gemmule ( an internal bud) 12 12
Asexual Reproduction
Sexual Reproduction l. Collar Cells produce gametes l. Both egg and sperm l. Most sponge species are hermaphrodites, they can produce both eggs and sperm.
Types of Sponge: Encrusting
Types: Boring 16
Types: Bath 17
Types: Glass 18
- Slides: 18