Table of Contents
Do segmented worms have shells?
Most mollusks have shells. Annelids are worms such as the familiar earthworm. They have segmented bodies. Annelids look like roundworms on the outside, but on the inside they are more like mollusks.
What are segmented worms made of?
collagen fibers
Annelids’ cuticles are made of collagen fibers, usually in layers that spiral in alternating directions so that the fibers cross each other. These are secreted by the one-cell deep epidermis (outermost skin layer).
Is the scale worm a parasite?
Arctonoe vittata is a species of scaled polychaete worms commonly known as a “scale worm”. This species often lives as a commensal of another marine animal….
| Arctonoe vittata | |
|---|---|
| Scientific classification | |
| Class: | Polychaeta |
| Order: | Phyllodocida |
| Family: | Polynoidae |
Do worms have a segmented body?
Segmented Worms: Phylum Annelida. The worms in the phylum Annelida (from the Latin root word annelus meaning ring) typically have complex segmented bodies (Fig. 3.43). The body of an annelid is divided into repeating sections called segments with many internal organs repeated in each segment.
Is segmentation present in Mollusca?
The phylum Mollusca is the second most diverse phylum after Arthropoda with over 110,000 described species. Mollusks may be primitively segmented, but all but the monoplacophorans characteristically lack segmentation and have bodies that are to some degree spirally twisted (e.g. torsion).
What will scale worms do if disturbed?
When you disturb them, they will take some time to settle back down before they go back to eating. If that is OK with you, then poke away.
How many species of segmented worms are there?
Polychaetes – The polychaetes include about 12,000 species that are characterized by having multiple hairs on each segment. They have nuchal organs on their neck that function as chemosensory organs. Most polychaetes are marine animals although some species live in terrestrial or freshwater habitats.
What kind of worms have dorsal dorsal scales?
Written By: Scale worm, any member of the superfamily Aphroditoidea (class Polychaeta, phylum Annelida), a group of widely distributed free-moving, segmented marine worms that possess dorsal scales.
Where can I find a red scale worm?
Red scale worm ( Levensteiniella kincaidi) found near hydrothermal vents of the northeastern Pacific Ocean. Scale worm, any member of the superfamily Aphroditoidea (class Polychaeta, phylum Annelida), a group of widely distributed free-moving, segmented marine worms that possess dorsal scales.
How big is an aphroditoidea scale worm?
Alternative Title: Aphroditoidea. Scale worm, any member of the superfamily Aphroditoidea (class Polychaeta, phylum Annelida), a group of widely distributed free-moving, segmented marine worms that possess dorsal scales. Scale worms range in size from 0.5 to 25 cm (about 0.2 to 10 inches).