Phylum Arthropoda Flashcards
(20 cards)
What does “arthropoda” mean?
“jointed legs”
What is interesting about them?
has more kinds species than any other phylum
Pro or Deu
protostome
Skin Layers
triploblastic: coelomate
Digestive Tract
complete digestive tracts
What kind of feeders are they?
- suspension feeders (e.g. barnacles), predators (spiders), herbivores (eat plants, fungi) and fluid feeders (butterfly)
What parts do they use for circulatory system?
gills (aquatic), tracheae (terrestrial): circulatory system for gases → oxygen delivered directly to body parts
Excretion
- use antennal glands
- terrestrial: malpighian tubules, coxal glands
Skeleton Structure
exoskeleton – skeleton on outside of body, not covered by living tissue
Layers of Exoskeleton:
Epicuticle
waxy (hydrophobic so acts as water proofing), outside is not getting wet from inside
Layers of Exoskeleton:
Procuticle
What is it and what does it allow?
- rigid, crunchy part of skeleton
- allows flexible areas of skeleton (e.g. joints)
- allows physical protection
- allows support (leverage – can push against ground effectively)
How do they shed exoskeleton?
Through a process called ecdysis.
Symmetry?
bilateral symmetry w/ cephalization
Level of Organization
organ systems
Nervous System
ganglia + ventral nerve cord
What kind of circulatory system do they have?
open circulatory system (no capillaries) + heart
Do they have tagmatization?
Yes.
What is special about their appendages?
- paired, jointed appendages
Types of Metamorphosis:
- Hemimetabolous
- young resemble adults
- feeds in all stages
- changes are gradual
- series instars (simple stage of life) that indicates age of animal
Types of Metamorphosis:
_ Holometabolous_
- young don’t resemble adults
- doesn’t feed as a pupa
- change is drastic
- adult can move but young can’t → resource partitioning
