What are the 3 characteristics of cephalopods and of mollusks?

What are the 3 characteristics of cephalopods and of mollusks?

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 unique characteristic of cephalopods compared to other molluscs?

Cephalopods are the only molluscs with a closed circulatory system. Coleoids have two gill hearts (also known as branchial hearts) that move blood through the capillaries of the gills.

What specific feature is only found in cephalopods?

The best-known feature of the cephalopods is the possession of arms and tentacles, eight or 10 in most forms but about 90 in Nautilus. Except for the nautilus, all living members of the class show great modification and reduction of the characteristic molluscan shell.

What do cephalopods have in common?

All cephalopods have either arms or tentacles, have blue-colored blood, and have the ability to use propulsion to help them move swiftly when needed. They use gills to breathe and are invertebrates (lack backbones). Many cephalopods grow fast and die young, the average lifespan of most is just one to three years.

What are the distinguishing features of cephalopods what features of cephalopods show their relation to other molluscs?

Characteristics: Cephalopods are mollusks, where the foot has developed into a set of arms or tentacles. Another common feature is their ability to squirt ink when threatened. Their body is symmetrical, i.e. the left and right side of the body is identical.

Which is not characteristics of cephalopods?

Excretory system – Cephalopods possess a single pair of large nephridia which produce nitrogenous waste and excrete it out from the body. Therefore, from the above discussion it has been clear that Sea squirt is not a cephalopod. Hence, option B is the correct answer.

What are cephalopods physical characteristics?

Cephalopoda means “head foot” and this group has the most complex brain of any invertebrate. Cephalopods are characterized by a completely merged head and foot, with a ring of arms and/or tentacles surrounding the head. The arms, tentacles, and funnel are all derivatives of the foot.

What are the similarities between cephalopods and vertebrates?

Cephalopods and vertebrates have simple eyes like a camera, with one lens projecting an image on the retina, in contrast to the compound eyes of arthropods, with a lens on each retinal element (ommatidium).

Why are cephalopods the most advanced mollusks?

Cephalopod mollusks such as octopus, cuttlefish, and squid (coleoids) are of special interest for studying the evolution and function of learning and memory mechanisms at the system level. They are believed to have the most advanced cognitive behaviors of all invertebrates, rivaling the abilities of many vertebrates.

What are Cephalopods physical characteristics?

What physical features have evolved in Cephalopods?

Early in their evolution, cephalopods relied on the sturdy protection of shells, but over time many eventually lost the outer shell and instead relied on new adaptations like heightened intelligence, a talent for hiding, and strong, flexible arms.

What physical features have evolved in cephalopods?