Arthropoda Flashcards
(Trilobita) Origins date from before the ________ period; extinct for _______ million years - _______ fossil
Cambrian, 200, index
(Trilobita) Trilobed body - ________, _________ & ________ (tail)
Cephalon, trunk, pygidium
(Trilobita) Head w/ ________, ________ eyes and appendages but no true ________.
Antennae, compound, mouthparts
(Trilobita) _________ trunk - pill bug like
Segmented
(Trilobita) Flattened __________, ________ feeder, scavenger
Dorsoventrally, bottom
(Trilobita) Ranged in size from ________ to _______ long.
1 inch, 6 feet
(Chelicerata) Means “_____________” - modification of the other appendages.
Having mouthparts
(Chelicerata) ________ pairs of appendages from cephalothorax including a single pair of _______ (mouth parts), a single pair of ________ - handling and sense of touch, _____ pairs of walking legs.
Six, chelicerae, pedipalps, four
(Chelicerata) No…
Antennae
(Chelicerata) Feed by _______________ from prey - use of digestive enzymes.
Sucking liquified food
(Merostomata, Eurypterid) _____________; largest of all arthropods, now extinct.
Giant water scorpions
(Merostomata, Eurypterid) Cephalon of ______ fused segments w/ both ________ & _________, chelicerae & pedipalps
Six, simple, compound eyes
(Merostomata, Eurypterid) _______ pairs of walking legs & segmented abdomen
Four
(Merostomata, Eurypterid) ________ telson or tail.
Spiked
(Merostomata, Xiphosurida) These are the…
Horseshoe crabs
(Merostomata, Xiphosurida) A living fossil; unchanged since the…
Triassic
(Merostomata, Xiphosurida) Body w/ ______, hinged ________ & ________ telson.
Carapace, abdomen, spiked
(Merostomata, Xiphosurida) Appendages: ________, _______ & ________ pair walking legs.
Chelicerae, pedipalps, four
(Merostomata, Xiphosurida) __________ on abdomen.
Book gills
(Merostomata, Xiphosurida) _______ compound eyes, ______ simple eyes.
Lateral, medial
(Merostomata, Xiphosurida) ___________ in wet sand at high tideline; eggs hatch & young return to the sea at a subsequent high tide.
External fertilization
(Pycnogonida) Are the…
Sea spiders
(Pycnogonida) _______ body & legs (~3 ft)
Long thin
(Pycnogonida) ________ of segments may add more sets of walking legs.
Repetition
(Pycnogonida) Respiration thru _______; _______ circulation.
Exoskeleton, limited
(Arachnida) Two tagmata (________ & ________).
Cephalothorax, abdomen
(Arachnida) Cephalothorax w/ ______ pair of chelicerae, pedipalps & _____ pair of walking legs (_______ on abdomen)
One, four, NONE
(Arachnida) Abdomen w/ __________, ________ & ______ organs.
Reproductive, respiratory, digestive
(Arachnida, Araneae) Cephalothorax & abdomen, chelicerae may be modified into ________, pedipalps for tactile & __________, _______ inside abdomen.
Fangs, sperm transfer, book lungs
(Arachnida, Araneae) Excretion by ___________ which filter wastes & dump into intestines where water can be reabsorbed, _______ to ______ simple eyes; sensilla detect ________.
Malpighian tubules, zero, eight, vibrations
(Arachnida, Araneae) Silk glands & spinnerets produce ____________, reproduction by ________, _______ fertilization; female lays ________.
Liquid protein thread, courtship, internal, fertilized eggs
(Arachnida, Araneae) Females usually much ________, males are practically just sperm donors (huge ______ for transfer) → many killed post fertilization to reduce ________ for young and provide _______.
Larger, pedipalps, competition, nourishment
(Arachnida, Scorpiones) Cephalothorax w/ small ________ & larger pincer-like ________.
Chelicerae, pedipalps
(Arachnida, Scorpiones) Pair of large ________ eyes with other _______ eyes.
Median, lateral
(Arachnida, Scorpiones) Preabdomen (________) w/ segments.
Unhinged
(Arachnida, Scorpiones) Long, slender flexible post abdomen (______) w/ telson (_______).
Hinged, stinger
(Arachnida, Opiliones) These are the…
Harvestmen
(Arachnida, Opiliones) Abdomen & cephalothorax _________.
Almost fused
(Arachnida, Opiliones) Two eyes set forward on…
Tubercle
(Arachnida, Opiliones) _______ pairs of long, thin legs.
Four
(Arachnida, Opiliones) Chelicerae are pincer-like; _________, Poisonous NOT venomous
Carnivorous
(Arachnida, Acari) These are…
Ticks & mites
(Arachnida, Acari) Mouth parts extend _______ of body.
Forward
(Arachnida, Acari) Many have no _____ - sensory adaptations to find _____.
Eyes, host
(Arachnida, Acari) ________ fusion of cephalothorax & abdomen.
Complete
(Arachnida, Acari) Many are ________ at some stage.
Ectoparasites
(Arachnida, Acari) Ticks are 2 mm to 3cm; Mites less than 1 mm, many are _________ in mammalian hair follicles.
Endemic
