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57 terms

Arthropods & Crayfish Dissection

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coelomate
arthropods have what body type?
chelicerata
What subphylum has no antennae?
crustacea
What subphylum has 2 sets of antennae?
hexapoda and myriapoda
what two subphylums have 1 pair of antennae?
true
true/false Arthropods are triploblastic?
bilateral
what kind of symmetry do arthropods have?
protostomes
deurostomes or protostomes?
tagmata
segmented body, segments called:
exoskeleton
what kind of skeleton?
chitin
what is the skeleton composed of?
open
arthropods have what kind of circulartory system?
hemocoel
what kind of body cavity? (hint: not acoelomate, coelomate, or pseudocoelomate)
hemolyph
fluid that functions as both blood and lymph, flows through the hemocoel
false
true/false arthropods have an incomplete digestive system
exoskeleton and jointed appendages
name two reasons for the success of arthropods
chelicerae
Subphylum Chelicerta: first pair of appendages called:_____ these find and manipulate food
pedipalps
Subphylum Chelicerta: second pair of appendages called: ______ these assist in movement
chelicerta
subphylum that includes horseshoe crabs, spiders, scorpians, ticks
carapace
part of the skeleton that protects/covers the head (cephalothorax) in the class Merostomata (horseshoe crabs)
opisthosoma
part of the skeleton that protects/covers the abdomen in the class Merostomata (horseshoe crabs)
telson
tail like structure that aids in anchoring in the class merostomata (horseshoe crabs)
cephalothorax
aka prosoma, the head portion that has the head and appendages in the class merostromata (horseshoe crabs) and arachnida
compound eyes
photoreception in the class Merostomata (horseshoe crabs)
ommitidia
receptors in the eyes in the class Merostomata (horseshoe crabs)
ocelli
the simple eyes smaller than the compound eyes in the class Merostomata (horseshoe crabs)
gill opercula
protect book gills in the class Merostomata (horseshoe crabs)
Arachnida
class that has spiders, ticks, mites, and scorpions
fangs
In the arachnida, the chelicerae are modified into these:
abdomen
houses the reproductive, digestive, respiratory, and web-spinning organs
tracheal spiracle
respiration located on the sides of the abdomen
book lungs
thin leaf-like structure for respiration
spinnerets
spinning webs, three paired structures at the posterior of the abdomen
5
Subphylum Crustacea: how many pairs of walking legs?
chelipeds
Subphylum Crustacea: first pair of walking legs modified into pincers are called the:
decapoda
Subphylum Crustacea: name the order that contain the crabs, lobsters, crayfish, and "true" shrimp
malacostraca
What class is the crayfish in?
antennae
Crayfish Dissection: longer paired appendages on the head that function as chemosensory and tactile receptors
antennules
Crayfish Dissection: shorter, paired appendages on the head used for chemosensory, tactile, and equilibrium reception
compound eyes
Crayfish Dissection: light detecting and image forming, held up on stalks
rostrum
Crayfish Dissection: pointed region between the eyes
telson
Crayfish Dissection: tail fin, (middle) for propulsion
uropods
Crayfish Dissection: on either side of the telson, also aid in propulsion
chelipeds
Crayfish Dissection: pincers for food capture and defense, first pair of walking legs
walking legs
Crayfish Dissection: locomation walking on land and crawling on substrate
swimmerets
Crayfish Dissection: abdominal appendages modified for swimming
copulatory swimmerets
Crayfish Dissection: male, larger swimmerets used for transfering sperm during copulation*
seminal receptacle
Crayfish Dissection: female, receives sperm
gastric muscles
Crayfish Dissection: attach from stomach to carapace to help move food
mandibular muscles
Crayfish Dissection: mastication of food, attach from side of stomach to mandible
gastric mill
Crayfish Dissection: chitinous teeth that grind food into a liquid mush
cardiac stomach
Crayfish Dissection: houses the gastric mill, thick walled anterior portion of the stomach
pyloric stomach
Crayfish Dissection: thin walled chamber where chemical digestion of food occurs
intestin
Crayfish Dissection: nutrient absorbtion into the blood
digestive glands
Crayfish Dissection: accessory digestive organ; secretes enzymes into the pyloric stomach
green glands
Crayfish Dissection: paired with excretory organs that release waste through small pores of the body
heart
Crayfish Dissection: contains ostia through which hemolyph enters the heart; specialized muscular chamber that pumps hemolyph into the hemocoel
gills
Crayfish Dissection: respiration and some excretion of nitrogenous waste