Download presentation
Presentation is loading. Please wait.
Published byTodd Gaines Modified over 8 years ago
1
Phylum Mollusca Gastropods (Snails, slugs) Bivalves (oysters, clams, mussels) Cephalopods (squid, cuttlefish, octopus) Marine, freshwater, moist land Secretes shell Locomotive foot
2
Class Gastropoda Mantle –Tissue that secretes shell Radula –Rows of rasping teeth for grazing –Modified in predators
3
Cone shells Single harpoon tooth –evolved from rowed ancestors –filled with paralyzing venom Conotoxins –Medical value for specific neural & muscle treatment –Addictive-free pain killers
4
Class Bivalvia Clams, oysters, mussels… Suspension filter feeders –Incurrent & excurrent siphons Spade-foot for locomotion Two valves (shells) secreted by mantle –Held closed by powerful adductor muscles
5
Class Polyplacophora –Chitons Graze on microalgae 8 overlapping plates Class Scaphopoda –Tusk shells Open at both ends Deeper benthic sand/mud
6
Class Cephalopoda Squid, octopus, cuttlefish, nautilus Shell: internal, external, or lacking Well developed nervous system Most adapted for active predatory lifestyle
7
Muscular foot modified to arms &/or tentacles –Siphon for locomotion Hydropropulsion Ink sac or gland –defense Chromatophores –Adjustable pigment cells Conotoxins in some
8
Phylum Arthropoda Insects, spiders, crabs, shrimp, centipedes Aquatic and land External skeleton Jointed bilateral appendages Segmented body Open circulatory system Many marine crustaceans –Two pairs of antennae –gills
9
Class Copepoda Very abundant plankton Long first antennae
10
Class Cirripedia Suspension feeders –Cirri Protected by calcareous plates Free-swimming larvae
11
Decapoda Shrimps, crabs, lobsters… 5 pairs walking legs –Thoracic pereopods –1 st pr as cheliped 5 pairs abdominal appendages –Pleopods or swimmerets
12
Amphipoda & Isopoda Laterally flattened Shrimp-like Dorsal-ventrally flattened
13
Phylum Echinodermata Spiny skin 5 classes –Crinoidea--feather stars and sea lilies –Asteriodea--sea stars –Ophiuroidea--brittle stars and basket stars –Echinoidea--sand dollars and sea urchins –Holothuroidea--sea cucumbers All marine; mostly benthic (sea floor) Radial symmetry Water vascular system –Tube feet Some regenerate asexually
15
Lophophorates Lophophore = unique ciliated feeding structure Bryozoans –Colonial moss animals –Secrete CaCO3 Brachiopods –Two valves (shells) Chaetognaths –Lophophore modified –Voracious predators
16
Phylum Chordata Notochord –Flexible rod-like structure Dorsal nerve cord –Tube for nerves Pharyngeal gill slits –Respiration and feeding Post-anal tail –Reabsorbed in some species Invertebrate chordates examples –Urochordata Tunicates, sea squirts, ascidians –Cephalochordata lancelets
Similar presentations
© 2024 SlidePlayer.com. Inc.
All rights reserved.