InvertebrateZooP3LEC31

Question 1

phylum Annelida

Answer 1

• Segmented worms with repeating units similar to our spine

ex. earthworms,

Question 2

class Oligochaeta

Answer 2

• named for their chaetae, bristles made of chitin
• include earthworms & many aquatic species
• harmless, important decomposers & for farms

Question 3

class Polychaeta

Answer 3

-have bristles that function as gills and aid
locomotion
-bites, but not venomous
ex. oyster worms, christmas tree worms

Question 4

class Hirudinea

Answer 4

• blood-sucking parasites, such as leeches

- carries no disease

Question 5

phylum Arthropoda

Answer 5

• segmented coelomates
• two-thirds of animal species are arthropods
• found in nearly all habitats of the planet

Question 6

what is the early arthropods called? what do they show?

Answer 6

• trilobites

- little variation from segment to segment

Question 7

As arthropods evolved, what happened to the segments and appendages?

Answer 7

• segments fused

- appendages became more specialized

Question 8

arthropod body Is completely covered by an

exoskeleton made of what?

Answer 8

chitin

Question 9

what is ecdysis?

Answer 9

the process when an arthropod molts its exoskeleton

Question 10

does Arthropods have an open or close circulatory system? do they eat and breathe through the same hole?

Answer 10

• open, in which their green blood is circulated around the organs
• no, have variety of organs for gas exchange

Question 11

subphylum Cheliceriformes

Answer 11

• named for clawlike feeding appendages called chelicerae

- include spiders, mites, scorpions, and horseshoe crabs

Question 12

class arachnida

Answer 12

most surviving cheliceriforms that includes spiders, scorpions, ticks, and mites

Question 13

which arachinds has parental care? diverse & overly collected?

Answer 13

• scorpions

- spiders

Question 14

what are 2 main segments of Arachnids?

Answer 14

abdomen(bottom body) and cephalothorax(top body)

Question 15

class Diplopoda

Answer 15

• have a large number of legs, two per segment
• millipedes, harmless
  ex. african millipedes

Question 16

class Chilopoda

Answer 16

• carnivores with jaw-like mandibles
• have one legs per segment
• centipedes

Question 17

subphylum Insecta

Answer 17

-more species-rich than all other forms of
animal life combined
-they live in almost every terrestrial habitat

Question 18

what is metamorphosis?

Answer 18

a process which every insects undergo where larval stage differ from adult stage

Question 19

how many orders are insects classified into?

Answer 19

about 26 orders including the Coleoptera(beetles) & Lepidoptera (moths & butterflies)

Question 20

subphylum Crustacea

Answer 20

• mostly remained in marine and freshwater environments
• coconut crabs are not like the rest
• barnacles are included

Question 21

order decapoda

Answer 21

• relatively large crustaceans
• include lobsters, crabs, crawfish, & shrimp
  ex. invation of christmas crabs, island northwest of austrailia

Question 22

planktonic copepods

Answer 22

• among the most numerous of all animals

- Krills

Question 23

phylum Echinodermata

Answer 23

• sea stars and other echinoderms
• in clade bilateria, has true coelom & closed vascular system like us
• we are surprisingly closely related to sea stars

Question 24

characteristics of Echinoderms

Answer 24

• slow-moving, sessile marine animals

- spiny skin covers a skeleton of hard calcium carbonate (limestone) plates

Question 25

what is the water vascular system that Echinoderms have?

Answer 25

a network of hydraulic canals for locomotion, feeding, and gas exchange

Question 26

T or F Echinoderms has both radial & bilateral symmetry. explain

Answer 26

true, they change from bilateral to radial symmetry

Question 27

class Asteroidea

Answer 27

• have multiple arms radiating from a central disk
• bear tube feet, each of which can act like a suction cup
• sea stars
• ancesters was bilateral