Invertebrates #2 Flashcards
What are the major characteristics of Phylum Anthropoda?
- Bilateral symmetry
- Segmented body and legs
- Chitinous exoskeleton
- must molt to grow
• largest phylum w/ 80% of all animals
What subphylum is in Phylum Anthropoda?
Subphylum Crustacea
What is the exoskeleton made of of Phylum Anthropoda?
bodies and legs have distinct segmentation and are covered with a chitinous exoskeleton.
In Phylum Anthropoda what is molting?
Exoskeleton must molt in order to grow, in a process involving a series of hormones
What are the characteristics of crustaceans?
•Primarily marine with a few freshwater and
terrestrial forms
• All crustaceans respire with gills
What do crustaceans respire with?
Gills
What are four major categories of crustaceans?
decapods, isopods, amphipods, and barnacles.
What animals are in decapods?
crabs, shrimp, crayfish, and lobsters.
What characteristics do decapods have?
- Five pairs of legs
- body is divided into a cephalothorax and abdomen
how many pairs of legs does a decapod have?
5
What’s the difference between a cray fish and spiny lobster?
A cray fish is smaller with big pinchers. A spiny lobster is bigger with no pinchers
What is the external difference between a male and female crab?
- female crabs abdomen is wider
- male crabs abdomen is narrow
What is the carapace?
the upper part of the exoskeleton/shell that covers the cephalothorax
What type of shape do shore crabs have?
They have a distinct “square” shaped carapace
Shore crabs are seen scavenging where?
Rocky shorelines
What are the characteristics of a kelp crab?
are the color of kelp, and have a carapace that is in the shape of a “shield”
What type of carapace do sand crabs have?
streamlined carapace
Where do hermit crabs live?
live in empty gastropod shells for extra protection
What are the characteristics of an isopod?
- Dorso-ventrally flattened
- lack carapace.
- Has many similar legs.
What type of animals are isopods?
wood lice, sow bugs, pill bugs
How do isopods respire?
respires with gills that need to stay moist
Where are isopods found?
in cool, moist, plant material.
How many pairs of legs does a pill bug have?
seven
Is the pill bug wider than it is taller? or taller than it is wider?
wider than it is taller
What are the characteristics of an amphipod?
- Laterally flattened
- lacks carapace.
- Has many specialized legs.
What animals are amphipods?
beach hoppers, beach fleas
What are the characteristics of barnacles?
Sessile marine crustaceans that live in in a permanent home
What animals are barnacles?
Acorn barnacles and goose barnacles
Where do barnacles grow?
to rocks, pier pilings, and other hard surfaces along the shoreline.
How do acorn barnacles feed?
They filter feed when covered with water at high tide
What happens to Acorn Barnacles when exposed to low tide?
withdraw into their protective home
How do goose barnacles live?
in a home of overlapping plates that are on top of a rubbery stalk.
What is the external anatomy of the Class Arachnid?
- Eight legs
Eight eyes (usually)
No antennae
2 major body parts
What are the 2 body parts of Class Arachnid called?
cephalothorax and abdomen
What animals are in the Class Arachnid?
spiders, tics, mites, scorpions.
How do Arachnids respire?
with spiracles that lead to trachea and/or book lungs
In an arachnid what is the function of the pedipalps?
Serve as sensory structures
In an Arachnid what is the function of the chelicerae?
to catch pray
What are the function of the eyes in an arachnid?
identification
In arachnid was is the function of the fangs?
to inject venom into it’s prey
In an Arachnid what is the function of spinnerets?
To produce silk
In an arachnid what is the function of the spiracle?
To allow oxygen to enter the trachea
In an arachnid what is the function of the spiracle?
To allow oxygen to enter the trachea
In an arachnid what is the function of the book lungs?
Where gas exchange takes place
What is #1?
cephalothorax
What is #2?
abdomen
What is #3?
spinnerets
What is #4?
book lungs
What is #5?
spiracles that lead to trachea
What is #6?
eyes
What is #7?
pedipalps
What is #1?
fangs
What is #2?
chelicerae
What is #3?
spider head
Why are arachnids important?
Important carnivores in terrestrial ecosystems
Where do black widows live?
live in cool, dark, undisturbed places like junk piles, storage sheds, etc.
What are the characteristics of the class insecta?
Six legs
• One pair of antennae
• 3 major body parts
• Respire with spiracles
What animal diagram is this?
Insecta diagram
What is #1
head
What is #2?
thorax
What is #3?
abdomen
How many classes are in Phylum Anthropoda?
4
What classes are in Phylum Arthropoda?
Class Arachnid, Class Insecta, Class Chilopoda, and Class Diplopoda
Characteristics of Class Chilopoda
- Centipedes
- Flattened bodies
- 1-pair of legs per segment
- Carnivore with poison claws
- 1-pair of antennae
- Spiracles
Characteristics of Class Diplopoda
- Millipedes
- Rounded body
- Two pairs of legs per segment
- No claws
- One pair of antennae
- Spiracles
What animal is in Class Chilopoda vs Diplopoda?
Centipedes Chilopoda Vs millipede Diplopoda
What type of bodies do Chilopoda have vs Diplopoda?
Chilopoda are flat, diplopoda are round
How many pair of legs does a chiplopoda vs a diplopoda have?
Chiplopoda has 1 pair, diplopoda has 2 pair
How many claws do Chiplopoda have vs Diplopoda?
Chiplopoda have 1 venomous one, Diplopoda have none
How many pairs of antennae do Chiplopoda have vs Diplopoda?
both have 1 pair
Do Chiplopoda vs Diplopoda have spiracles?
yes both
