Lec 3: Anthropoda, Annelida, Ectoproda, Brachiopoda

Question 1

Phylum Anthropoda

Answer 1

Largest phylum in animal kingdom (insects, arachnids, crustaceans, myriapods) Segmented body, chitin exoskeleton, bilateral symmetry, triploblastic, coelomate, developed sensory, open circulatory sys (no veins) molting

Question 2

Class Trilobita (phylum anthropoda)

Answer 2

Extinct marine arthropods, first to develop hard exoskeletons, help date rock layers, dominant, paleozoic

Question 3

Class merostomata (phylum anthropoda)

Answer 3

Horseshoe crabs, blood used to detect bacteria contamination in biotech, specialized mouthpart chelicerae (food)

Question 4

Class arachnida (phylum anthropoda)

Answer 4

Spiders, scorpions, ticks, mites. 4 sets of legs, chelicera (fangs) pedipalp (sensing/feeding) book lung (gas exchange, spiders/scorps) tracheal tube (ticks, mites)

Question 5

Subphylum myriapoda (phylum anthropoda)

Answer 5

millipedes, centipedes. elongated body, many legs, antennae, mandibles (feeding) Ocelli (“simple eyes”)

Question 6

class diplopoda (Subphylum Myriapoda)

Answer 6

Millipedes, 2 walking legs per seg. , segmented, herbivores

Question 7

Class chilopoda (subphylum myriapoda)

Answer 7

Centipedes, one pair legs per seg. , carnivorous, venomous

Question 8

Class Insecta (phylum anthropoda)

Answer 8

Enormous diversity, metamorphosis chrysalis or cocoon (complete Meta) or nymph to adult (incomplete) coevolution with pollinators

Question 9

Phylum Annelida

Answer 9

Segmented worms. Bilateral symmetry, coelomate, complete digestive system, closed circulatory system

Question 10

Class Polychaeta (phylum Annelida)

Answer 10

“Marine worms” Parapodia (paddle like appendages for locomotion/respiration/sensation) Setae ( hair-like structure, locomotion/sensory) Distinct head

Question 11

Class Clitellata (phylum Annelida)

Answer 11

Leeches (hirudinea) and earthworms (oligochaeta) Bilateral, triploblastic, coelomate, open gut, *clitellum (saddle-like region of adult body, responsible for production of mucus/eggs in reproduction)

Question 12

Phylum Brachiopoda

Answer 12

“Lamp shells” (look like clams) 2 shell halves, smaller half = dorsal, larger = ventral. Lophophore (cilliated feeding structure) Pedicle (foot used to attach to ocean floor) Sessile (non moving, uses pedicle)

Question 13

Phylum Ectoprocta

Answer 13

“Bryozoans” (moss animals) Primarily colonial, individuals called zooids, often connected by shared exoskeleton. Lophophore (cilliated filter feeding structure) Sessile (non moving, attach to hard surfaces)

Question 14

class maxillopoda (subphylum crustacea)

Answer 14

Barnacles, copepods (zooplankton) nauplius larva = free swimming crustacean larvae

Question 15

Class malacostraca (subphylum crustacea)

Answer 15

Krill (zooplankton) Crabs, lobsters, shrimp, crayfish