What do mollusks and annelids have in common?
Most mollusks have tentacles for feeding and sensing, and many have a muscular foot. Mollusks also have a coelom, a complete digestive system, and specialized organs for excretion. Annelids have a coelom, closed circulatory system, excretory system, and complete digestive system. They also have a brain.
Why are annelids and mollusks closely related?
Because annelids are actually more closely related to species within the mollusk phylum than they are to their worm cousins in the flatworm and roundworm phyla. Although they look quite different on the outside, mollusks and annelids share a more recent common ancestor than roundworms and annelids.
How are mollusks and earthworms different?
Mollusks are invertebrates such as the common snail. Most mollusks have shells. Annelids are worms such as the familiar earthworm. Annelids look like roundworms on the outside, but on the inside they are more like mollusks.
What is the larval stage shared between mollusks and annelids?
trochophore, also called trochosphere, small, translucent, free-swimming larva characteristic of marine annelids and most groups of mollusks.
Are mollusks Heterotrophs or Autotrophs?
Yes, all mollusks are heterotrophic, because mollusks are animals, and all animals are heterotopic, meaning that they need to consume organic carbon…
What evidence shows that mollusks and segmented worms are related how are they different?
Evolution of Mollusks Scientists believe these two groups are related because, when they are in the early stage of development, they look very similar. Mollusks also share features of their organ systems with segmented worms. Unlike segmented worms, however, mollusks do not have body segmentation.
What is the difference between Mollusca and Arthropoda?
Mollusks are the soft-bodied invertebrates with one or two shells, whereas arthropods are the invertebrates with segmented bodies, jointed legs and appendages. Furthermore, mollusks have mantles that secrete calcareous outer or inner shell while arthropods have an exoskeleton made up chitin.
What are the four parts of the body plan of most mollusks?
The body plan of most mollusks has four parts: foot, mantle, shell, and visceral mass.
What are the four characteristics of mollusks?
Main characteristics of Mollusca :
- Unsegmented soft body with bilateral symmetry.
- Presence of an internal or external shell.
- A toothed tongue (made mostly of chitin) called the radula.
- A mantle which is a fold in the body wall that lines the shell.
- Muscular foot (and/or tentacles in some).
Do all mollusks have shells?
Not all mollusks have shells, however– there are plenty of species of mollusks without shells. Instead of a shell, their backs are protected by sturdy reinforced skin, scales, spines, or incomplete armored plates. The word “mollusk” comes from the Latin “molluscus,” meaning soft.