Phylum Mollusca and Annelida Flashcards
What body cavity do Mollusca and Annelida have?
Coelomate
What phylums are protosomes?
Mollusca
Annelida
Arthropoda
What phylums are deuterostomes?
Echinodermata
Chordata
Mollusks (snails, clams, octopuses, and squids) are soft-bodied animals w/ a specialized layer of epidermal cells called a _____ that secretes a _____.
Mantle, Shell
Mollusca have 4 parts of their body plan, what are they?
- Head-foot - used for locotion
- Visceral Mass - digestion, excretion, repoduction, sensory structures
- Shell - made of calcium carbonate
- Mantle - aid in respiration and locomotion
All mollusks except cephalopods have a ___ circulatory system.
Open
What are the 4 classes of Mollusca?
Polyplacophora
Gastropoda
Bivalvia
Cephlapoda
What is the genus of polyplacophora?
Chiton
A horny-toothed organ in the mouth, scrapes food
Radula
What 2 gastropods do not produce a shell?
Common garden slug, nudibranch
What is nudibranch defense mechanism?
They eat sea jellies, hydrozoans, and corals which all have stinging structures called nematocysts. The stingers are stored on the dorsal surface of the nudibranch.
Clams, oysters, scallops, and mussels are ______.
Bivalves (two shells)
The space between the mantle and the visceral mass is the _____ _____.
Mantle Cavity
The circulatory system of annelids is _____.
Closed
Annelids also have _____, small, bristle-like appendages often occurring in pairs on lateral and ventral surfaces.
Setae
What are the classes of phylum Annelida?
Polychaeta
Oligochaeta
Hirudinea
What is the genus of class polychaeta?
Nereis (clam worm)
Nereis is distinctly segmented and each segment bears a pair of fleshy appendages called _____.
Parapodia
What are 2 functions of setae in Polychaeta?
1 - Setae filled w/ poison and used for defense
2 - Help filter food from water
What is the genus of class Oligochaeta?
Lumbricus Terrestris (earthworm)
What kind of skeleton do Oligochaetes have?
Hydrostatic (water-pressure) support system
Oligochaetes lack parapodia and have ___ setae.
Few
What part of a earthworm is used for reproduction?
Clitellum
Are earthworms monoecious dioecious?
Monoecious / hermaphroditic
Function of pharynx in earthworm
For suction and ingestion of food
Function of esophagus in earthworm
For transport of food
Function of crop in earthworm
For food storage and some digestion
Function of gizzard in earthworm
For crushing of food
Function of intestine in earthworm
Absorption of nutrients
Paired nephridia in earthworms function like kidneys and…
Collect and release excretory wastes
The waste in earthworms is released through external pores called _____.
Nephridiopores
How many aortic arches (hearts) do earthworms have?
5
Hirudineans include leeches which are ____parasites.
Exit
Leeches ____ setae.
Lack
Are leeches monoecious or dioecious?
Monoecious / hermaphroditic
How do leeches reproduce?
Sexually
