Marine biology Module 5 Notes

==MARINE INVERTEBRATES II==

Vocab

  • Mantle
  • Radula
  • Chitin
  • Open Circulatory System
  • Closed Circulatory System
  • Molting
  • Cephalothorax
  • Carapace
  • Water Vascular System
  • Ambulacral groove
  • Notochord
  • Dorsal Nerve Cord

Important words to focus on ā†’

- The Phylum Mollusca

- The Phylum Arthropoda

- The Phylum Echinodermata

- The Phylum Chordata

A mantle is a layer of tissue surrounding the animal

A Radula is made up of multiple rows of small teeth that are used for scarping food into the organismā€™s mouth

- The class Gastropoda

The Nudibranchs do not have shells

- The Class Bivalvia Is made up of organisms such as mussels, clams, Oysters, and scallops

The location where the valves hinge together is a noticeable hump called the umbo

In the class Cephalopoda some can camouflage, which is achieved as a result of Chromatophores

Hermaphroditic means that each individual has a male and female gonads and can produce both male and female gametes

FUN FACTSā†’

  • The 4 Phylum highlighted above are much more complex in their body and processes that other organisms you have learned about previously
  • Mollusks have more representative species in the ocean than any other group
  • They can be found in major marine environments
  • Some of the most common Mollusks Clams, abalone, cone shells, squid, and octopus.
  • Most mollusks have a bilaterally symmetric soft body protected by a shell
  • There are 7 classes of Mollusks
  • The head of a Gastropod is a very complex compared to that of many otherā€™s mollusk
  • Some bivalves such as clams burrow themselves into the sand using their muscular foot
  • Cephalopods have a very complex eye structure that includes a retina, cornea, iris, and lens
  • All species in this class are very agile swimmers, This is because of their mantle structure
  • Some octopus spies can inject a paralyzing poison in to their prey
  • Chitions live on rocky shores and graze on algae
  • All mollusks have a one way gut
  • Some nubibranches actually can photosynthesize
  • Fertilization is usually external, with the animals releasing the sperm and eggs into the water
  • In most Cephalopods, fertilization is internal
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