What organisms are in Cephalopoda?
Cephalopod, any member of the class Cephalopoda of the phylum Mollusca, a small group of highly advanced and organized, exclusively marine animals. The octopus, squid, cuttlefish, and chambered nautilus are familiar representatives.
How many animals are in the class Cephalopoda?
There are over 800 living species of cephalopods, loosely divided into two groups called clades: Nautiloidea (of which the only surviving species is the nautilus) and Coleoidea (squids, cuttlefish, octopuses, and the paper nautilus).
Which of these animals is a mollusk?
Mollusks. The mollusk group spans over 50,000 known species. They include snails, clams, oysters, mussels, squid and octopods. In general, their bodies include three parts: the head, internal organs and a “foot.”.
What are the 4 groups of cephalopods?
A highly intelligent group of ocean dwelling creatures, the living cephalopods include the eight-armed octopuses, the ten-armed squids and cuttlefishes, and the shelled chambered nautiluses.
Is a jellyfish a cephalopod?
But often, people will guess that jellyfish are related to cephalopods—octopuses or squids—since they all have tentacles. It’s not a bad guess. But it’s incorrect. Cephalopods have three layers of tissue while jellyfish only have two, and two openings to their digestive tracts while jellyfish only have one.
Are octopus good moms?
Many octopus mothers, such as the giant Pacific octopus (Enteroctopus dofleini), are known to lay eggs only once in their lives. They guard and care diligently for the eggs, all the while losing weight and weakening due to a lack of food. over the clutch of eggs,” the scientists write.
What are 3 characteristics of all cephalopods?
All cephalopods have the same basic anatomy. They’re made up of a body, a head and a foot. They have a muscular casing called a mantle which contains and protects their organs. They all have arms — at least eight of them — that are attached directly to their heads, but only some species also have tentacles.
What is a female octopus called?
A female octopus, known as a hen,Â may lay 100 thousand eggs… over its one-to-two-week fertile period. The transparent eggs are protected by the mother in the octopus’ lair for several weeks.