Lab 6: Animal Diversity 2 (The Coelomates)

What are the 4 classes in phylum mollusca?

Polyplacophora, gastropoda, bivalvia, cephalopoda

Do all molluscs have a head?

No

What does mollusc/a mean?

Soft

What does placophora mean?

Having plates

With what do chitons scrape algae off rock?

Radula (rough tongue like a cat)

What are the parts of a mollusc?

Foot (piece of muscle for movement), visceral mass (guts), and mantle (layer of tissue to protect mass)

What is this?

Chiton

Which end is anterior? Which is posterior?

Left = anterior; Right = posterior (water flow goes to posterior end)

Do bivalves have a radula?

No (only class that doesn’t have one)

Gastropods either have a type of shell or no shell at all. (T or F)

True

What does the mantle produce?

Shell (fluid hardens)

How many arms (NOT tentacles) does an octopus have?

8

What is the difference between a tentacle and an arm?

Tentacle = suction cups only at tips & retractable

Arm = suction cups running full length

Which cephalopod is the most primitive?

Nautilus

Describe arthropods and give examples

Jointed appendages, chitinous exoskeletons, segmented bodies; Chelicerata (spiders, mites), crustacea (crabs, shrimp), hexapoda (insects), and myriapoda (centipedes, millipedes)

How many antennae do Myriapoda have? Hexapoda? Crustacea? Chelicerata?

Myriapoda & Hexapoda = 2

Crustacea = 4

Chelicerata = 0

How many legs do Myriapoda have? Hexapoda? Crustacea? Chelicerata?

Myriapoda = many

Hexapoda = 6

Crustacea = it varies (no definitive number)

Chelicerata = also varies

What does arthro mean? What does pod mean?

Arthro = joints

Pod = foot

How do myriapods breathe?

They have holes for air that goes through tubes

Difference between millipedes and centipedes?

Millipede = 2 pairs of legs per segment, many poisonous, herbivores

Centipedes = 1 pair of legs per segment, venomous (injected), predators

What is aposematic coloration?

When an animal is brightly colored and harmful

What arthropoda subphylum is this in?

Chelicerata

What arthropoda subphylum is this in?

Myriapoda

What arthropoda subphylum is this in?

Crustacea

What arthropoda subphylum is this in?

Hexapoda

Horseshoe crabs are in subphylum Chelicera. (T or F)

True

What is the arrow on the right pointing to?

Chelicerae (spider fangs)

What is arrow on the left pointing to?

Pedipalp (sensory organs & handle prey)

What is a book lung?

Respiratory organs (holes on outside of body w/ layers) found in spiders, scorpions, and horseshoe crabs

Describe hexapoda.

They are insects with 6 legs and have wings developed from an exoskeleton.

Describe crustaceans.

They have 2 pairs of antennae, they go on land and water, and they have gills (land crustaceans must keep theirs moist).

Is this pill bug a crustacean?

Yes

What phylum are these in?

Arthropoda

What are these?

Gastropods

What are these?

Bivalves

Which class of phlyum mollusca is this in?

Cephalopoda

Which class of phlyum mollusca is this in?

Bivalvia

Which class of phlyum mollusca is this in?

Polyplacophora

Which class of phlyum mollusca is this in?

Gastropoda