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Classes Flashcards

(12 cards)

1
Q

Merostomata

A

-2 body regions
-cephalothorax and abdomen
-covered by exoskeleton
-joint appendages
-pincer-like chelicerate mouthparts
-heavy gnathobases spine
-book gills, increase surface area over which animal can absorb oxygen from the water
-horseshoe crab

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2
Q

Arachnida

A

-Chelicerate mouthparts
-pedipalps near mouth
-4 pairs of walking legs
-2 body regions, cephalothorax and abdomen
-no antennae

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3
Q

Chilopoda

A

-head and many segmented body
-2 antennae (1 pair)
-Mandibles, jaw like mouth parts
-poison fangs are first pair behind head
-1 pair of legs
-centipedes

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4
Q

Diplopoda

A

-head, many segmented body
-2 antennae (1 pair)
-2 pairs of walking legs (4) per segment
-produce bad smelling chemicals
-mandibles
-herbivore
-millipedes

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5
Q

Crustacea

A

-mandibles
-cephathorax and abdomen
-various number of appendages
-appendage on abdominal segment
-2 branched (biramous) appendages
-2 pairs on antennae (4) on head

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6
Q

Hexapoda

A

-head, thorax, abdomen
-3 pairs of walking legs on thorax
-segmented body
-no appendages
-2 antennae (1 pair)
-mandibles
-can have wings

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7
Q

What are and who have tracheal systems?

A

tubes exposed by spiracles for gas exchange
centipedes, millipedes, insects

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8
Q

Chitons (polyplacophera)

A

diverged early in Mollusk evolution. Fossil evidence indicates that they are closest to the ancestral mollusk body plan.

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9
Q

Gastropods

A

start with similar body plans as chitons, but their bodies go through torsion during development.

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10
Q

Nudibranchs (sea slugs)

A

a shell-less gastropod Many nudibranchs taste bad or are toxic and exhibit warning coloration. Some eat Cnidarians and store the cnidocytes in their skin.

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11
Q

Bivalves

A

have a two-part mantle that makes two hinged shells out of calcium carbonate. Most are filter feeders and are sessile. Bivalves do not have a radula. The foot is used for burrowing into sediments

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12
Q

Cephalopods

A

(octopuses, squid and cuttlefish) have a foot that is modified to form arms, tentacles and a siphon. Most cephalopods have either no shell or a very reduced shell.

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