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39 Cards in this Set

  • Front
  • Back
Defining characteristics of crusaceans
Head, Thorax, Abdomen
Fusion of head and thorax
first antenna, mandible, second antenna, first maxilla and second maxilla
5 head appendages
name 5 head appendages on crustaceans
1Antennular somite
2antennal somite
3mandibular somite
4maxillulary somite
5maxillary somite
Food handling appendages on crustaceans
maxilliped and chelliped
name of eye on a crustacean
stalked eye
name and identify the parts of the crustacean appendages
protopodite-proximal section, gills or swimming


type of larvae that crustaceans have
nauplius larvae
eye characteristics of crustaceans
simple ocelli and compound eyes (usually on elevated stalks)
how do crustaceans administer gas exchange
Water enters at base of chiliped, aqueous diffusion across branchial "gill" surfaces, exits thru paired nephridial structures (green glands and maxillary glands)
crustacean excretion
diffusion across gills (if they are present), Paired nephridial structures (antennal glands or green glands and maxillary glands)
Subclass Malacostraca has what Order in it?
Decapoda (lobsters, crabs, shrimp, crayfish)
Characteristics of order decapoda?
5 pair of swimming legs
Facts about shrimp
considered primitive group
laterally compressed
exoskeleton is then/flexible
often pelagic, appendages modified for swimming
some benthic, hide in borrows
Facts about lobsters/crayfish
dorsoventrally flattened
heavy bodied
fresh or marine
first walking legs - large claw
typically live in crevices or borrows
facts about crabs
shortened body plan
abdomen carried ventrally
large claws for defense
walk sideways - very fast
highly diverse, largest arthropod
identify the following on a picture of a crab
first antenna
second antenna
stalked eye
What are the two orders under the Subclass Branchipoda under phylum arthropoda?
Cladocera and
how do Branchipoda feed?
filter feed, few carnivores
What are characteristic of the branchipoda? function?
Coxa (leg appendage) modified to form large, flattened paddle. Used for gas exchange and locomotion

2 maxillae are reduced or absent

typically paired comound eye and single simple eye
Charactertistics of Order Cladocera
2nd antennae for swimming
parthenogenesis common (egg dev w/o fertilization)

stress induces females to produce males (sex reproduction)

cyclomorphism (seasonal body form change)

Ephippium - molting of carapace

molting of carapace. Used a as a modified egg case for the Cladoceras
seasonal changes in body form, a response to predation
egg development without fertilization
Order Anostraca
Class Crustacea
Subclass Branchipoda
Order Anostraca

lack carapace or head shield
very small
appendages are biramous
stalked eye
"fairy shrimp"
Brine shrimp taxa
Phylum Arthropoda
Class Crustacea
Subclass Branchipoda
Order Anostraca
Genus Artemia
artemia and salinity
occurs in saline lakes worldwide

tolerant of a wide range of salinity from 10% to 30%

Maintains salt concentrations in blood of 1-3% by excretion of salt through gills
Describe the Artemia life cycle
2 generations per year

eggs produce nauplii

nauplii mature to adults

live brith of second generation

these mature to lay eggs that can diapause
Subclass Ostracoda
Phylum arthropoda
Class crustacea

very small
5 pair appendages: 2 antennae, 1 mandible, 2 maxillae
trunk at most 2 pairs appendages
No external sign of segmentation
body is encased in calcificed, bivalved carapace
lack growth rings
antennae used for locomotion
variety of feeding strategies
Subclass Copepoda
Class Crustacea
Subclass Copepoda

very diverse habitat, do well almost everywhere

can be paracitic
thorax w/6 segments, abdomen with 5 segments

head + 1st thoracic segment is fesed - no carapace, but cephaic shield instead
NO abdominal appendages
naupliar eye
naupliar eye
eye of a copepoda, single in middle of head
What are some functions of copepoda appendages
Food acquistion
what adaptations do male copepods have for mating?
males have one or both of 1st antennae modified with a hinge to capture females

5th thoracic appendages bear claw modified for holding female
which appendages do copepoda use for food aquistion
1st and 2nd maxillae
Subclass Cirripedia
Phylum Arthropoda
Class Crustacea
Subclass Cirripedia

primarily hermaphroditic, some have sep. sexes. Never fertilize themselves

Compound eye secondarily lost and median eyes reduced or absent in adults

modified for attachement

thoracic limbs modified as filtering cirri

no abdomen

colonizers and play important role in ecology of intertidal zone and mangrove swamps

Adults move by commnesalism with other species

Larvae are mobile
Subclass Pentastomida
Phylum Arthropoda
Class Crustacea

Tounge worms
all parasitic, lungs and nasal passages of vertebrates
appendages highly reduced and modified, 2nd pair with claws

Show both annelid and arthropod charact

Cuticle is w/o chitin,
mouthparts = four pairs of chitinous hooks

larval legs unjointed and adults legless
suspension feeder feeding apparatus in Cirripedia
name and identify parts of a lophophore
Tentacles of lophophore, anus, mouth
Lophophore feeding
Cilliary mucus suspension feeders

Tentacles bear cilia
action of cilia drives water into the ring of tentacles from the top and outward between individual structures

Capture of suspended food particles and conducted to mouth by way of food groove
3 phyla categorized as lophophorates
Characteristics of Phylum Phoronida
Trimeric, Veriform
Body divided into:
Coelom, U shaped gut, anus close to mouth, circ. system closed, dioecious or hermaphroditic