Crustaceans

what phylum are crustaceans in?

insects and crustacea make up what percent of animal species

what are crustaceans names for

main distinguishing feature of crustaceans

what does biamous mean?

habitat of most crustaceans

in addition to antennae what is on the crustacean head?

do derived crustaceans have more or less segments than ancestral forms?

closest arthropod relative to insects

probably the most abundant animals in the world

typical major body tagmata

\n In most crustaceans, one or more thoracic segments are \n fused with the head. What is this segment called?

how many body segments do current crustaceans have?

dorsal cuticle found in many crustaceans that may \n cover most of body including thoracic and abdominal segments or just the cephalothorax in some species.

what is the cuticle made of?

what do joints allow?

end of abdomen ends that bears anus

Dorsal cuticular plates

lateral plates

ventral plates

are most crustacea monoecious or dioecious?

where is sperm introduced to females

where do female crustaceans hold eggs

major space in arthropods that came from persistent blastocoel which is filled with blood

two parts of protopods

what basic plan is seen in crayfish appendages?

condition where biamous appendages are homologous but may have been modified to have different functions

what systems in the thorax and abdomen show segmentation

Most muscles arranged as _________ groups (perform opposite functions) with flexors drawing limb toward the body and extensors straightening a limb out.

what type of circulatory system?

how many chambers in crustacean heart?

do crustaceans have arteries or veins

name for crustacean blood

why can hemolymph be different colors

green glands in excretory system

Double ventral nerve cord has a pair of ______ for each segment to control appendages, muscles, and other parts

photoreceptor units that make up compound eyes

covers each eye

small squares and hexagons in cornea called that focus light.

Common larval form with uniramous first antennules. First larval form after the egg

what two layers is the procuticle divided into?

dissolved by enzymes during molting

layers of cuticle shed by animal during ecdysis

how does an animal break cuticle in ecdysis?

the shedding of the old cuticle

the physiological process of making a larger cuticle

feeding habits found in crustaceans

how many parts to a crayfish stomach?

one of the few truly terrestrial crustaceans that also have \n marine and freshwater forms

why must isopods live in moist environments?

light-producing organ that gives krill bioluminescence

what is unique about the gills of krill?

Approximately 18,000 species which includes crayfishes, lobsters, crabs, and true shrimp

Crabs have a __________ cephalothorax and __________ abdomen as compared to crayfish or lobsters.

largest sense organs in crustceans

3 sets of eye pigment cells

optical units made up of the three eye pigments that form the compound eye

Barnacles are _________ but generally cross-fertilize

where do most crustaceans brood eggs?

what secretes cuticle

growth phase of molting where animals grow with soft tissue increasing in size until there is no space within the cuticle

molting phase where body fills cuticle and epidermal cells enlarge prior to ecdysis

located on the median side at the base of the fifth pair of walking legs in crayfish

located on the median side at the base of the third pair of walking legs in crayfish

located at the midventral line between fourth and fifth pair of walking legs