Phylum Annelida: Segmented Worms

Flashcards focusing on the key vocabulary from the lecture notes about segmented worms in Phylum Annelida, covering definitions and characteristics of various classes and structures.

Eukarya

A domain that includes organisms with complex cells, containing a nucleus.

Phylum Annelida

A phylum that includes segmented worms, which have a true coelom and a segmented body.

Peritoneum

The cellular layer that lines both sides of the coelom in annelids.

Class Oligochaeta

A class within Phylum Annelida that includes earthworms and freshwater worms, characterized by having few bristles.

Setae

Small bristles found on the body of annelids, aiding in movement and anchorage.

Clitellum

A glandular, enlarged ring on certain segments of the earthworm that secretes mucus during copulation.

Coelom

A fluid-filled body cavity within annelids, providing space for internal organs.

Typhlosole

A swollen ridge inside the intestine of annelids that increases surface area for nutrient absorption.

Peristalsis

The wave-like muscle contractions that facilitate movement of the worm through soil and digestion.

Class Polychaeta

A class of annelids that are primarily marine and characterized by multiple bristles and often possess parapodia.

Class Hirudinea

A class of annelids that includes leeches, which are distinguished by their lack of setae and presence of suckers.

Anticoagulant

A substance secreted by blood-feeding leeches to prevent blood from clotting during feeding.

Where does the digestive system begin

It starts at the mouth and the anus is on the other end.

What is one feature the word doesn’t have that marine animals have

Gills

What does the worm do in order for it to move ?

It contracts the inner longitudinal muscle into the posterior part and sticks the setae into the soil