Quiz 7- arthropoda, echinodermata

Question 1

List the organisms known to have chelicerae

Answer 1

Subphylum Chelicerata

Question 2

Define chelicerae

Answer 2

either of a pair of appendages in front of the mouth in arachnids and some other arthropods, usually modified as pincer-like claws

Question 3

general characteristics of arthropoda

Answer 3

3 tissue layers
coelom
complete gut
bilateral symmetry
external cuticle made of chitin
segmentation + jointed appendages
rigid skeleton- molting necessary
sometimes have antennae that can taste + smell
compound + simple eyes

Question 4

Orders of subphylum Chelicerata

Answer 4

Xiphosura and Pycnogonida

Question 5

Chelicerata general characteristics

Answer 5

body divided into TWO major sections
1st section has 6 pairs of appendages

Question 6

Subphylum Chelicerata, Class Pycnogonida

Answer 6

most common in shallow water, but some larger ones found in deep water
Usually consume soft-bodied invertebrates with proboscis
Usually have EIGHT walking legs
legs are thin enough that they can efficiently absorb oxygen thru diffusion

Question 7

Subphylum crustacea general characteristics

Answer 7

Head with 2 pairs of antennae & specialized mouthpart appendages
Feeding and/or walking appendages on thorax (mid-section)
Posterior abdomen may have appendages used for respiration or swimming
Great range of feeding adaptations: crabs are largely carnivores, barnacles are suspension feeders, amphipods are detritus feeders

Question 8

Describe Horseshoe Crab reproduction.

Answer 8

Breeding - Spring and Summer in NE US
Migrate to shallow coastal waters (notable in Delaware bay area!)
Male latches on back of female and fertilizes eggs while they are laid in the sand
Females can lay between 60,000 and 120,000 eggs
Eggs take about 2 weeks to hatch

Question 9

Differentiate between the Xiphosura and Pycnogonida.

Answer 9

horseshoe crabs vs sea spiders

Question 10

List the major classes of (subphylum) Crustacea.

Answer 10

Malacostraca
Thecostraca

Question 11

List the major orders of class Malacostraca.

Answer 11

Decapoda
Stomatopoda

Question 12

Decapoda

Answer 12

Crabs + lobsters
DECA –> 10 legs
lobsters- live in crevices/burrows on the seafloor
3/5 of the pairs of legs have claws

Question 13

Stomatopoda

Answer 13

mantis shrimp

Question 14

Thecostraca

Answer 14

barnacles

Question 15

Understand how the water vascular system works, and what major phylum of invertebrates it is associated with.

Answer 15

ECHINODERMATA
water exchanged thru a madreporite (dorsal sieve plate: eg: starfish mouth)
Relief valves (pipettes) and water movement together cause pressure + suction
Tube feet used for suction + mucus secretion, (+ locomotion in sea urchins)

Question 16

List the major classes of (phylum) Echinodermata

Answer 16

Asteroidea
Echinodea
Crinoidea
Holothuroidea
Ophiuroidea

Question 17

Asteroidea

Answer 17

True starfish

Question 18

Echinoidea

Answer 18

Sea Urchins, Sand Dollars, Heart Urchins

Question 19

Crinoidea

Answer 19

sea lillies + feather stars

Question 20

holothuroidea

Answer 20

sea cucumbers

Question 21

ophiuroidea

Answer 21

brittle stars + basket stars