Phylum Anthropoda, Annelida, Brachiopoda, Ectoprocta Flashcards
When did animals colonize land?
~450 mya
Thought to be relative of phylum Arthropoda
pros of an exoskeleton for phylum Arthropoda
resist gravity, reduce desiccation
made of chitin (part of ecdysozoa, same as nematodes, roundworms)
jointed/segmented
Characteristics of phylum Arthropoda
bilateral, triploblastic, coelomate (body cavity surrounded by mesoderm), open gut
*Phylum Arthropoda has an open or closed circulatory system?
open circulatory system (heart, artery, no veins)
Tracheal Tubes
respiratory-> insects
book lung-> spiders
Malpighian Tubes
osmoregulation; balance of water and solutes in body (insects)
Class Trilobita
extinct, Paleozoic (dominant)
Phylum Arthropoda
Class Merostomata
horseshoe crabs
phylum arthropoda
Class Arachnida
spiders, scorpions (4 sets of walking legs)
Class Arachnida: Chelicera
front-most appendage (fang)
Class Arachnida: Pedipalp
food handling
Class Arachnida: booklung
gas exchange
Class Chilopoda
centipedes (1 walking legs/ segment)
subphylum myriapoda
Class Diplopoda
millipedes (2 walking legs/segment)
subphylum myriapoda
Class Insecta
enormous diversity: coevolution with pollinators & flight
complete metamorphosis: chrysalis or cocoon (only some, not all)
phylum arthropoda
Class Maxillopoda
barnacles, copepods (zooplankton)
subphylum crustacea
Class Malacostraca
crabs, krill
larva = nauplius larva
subphylum crustacea
Phylum Annelida
“segmented worms”
bilateral, triploblastic, coelomate, open gut
Class Polychaeta
“polychaete worms”, has parapodia & many setae (hairs)
Phylum Annelida
Class Clitellata
no parapodia, few setae (hairs)
•subclass Oligochaeta: earthworms
•subclass Hirudinea: leaches
Phylum Annelida
What do phylum Brachiopoda and Ectoprocta feed with?
lophophores
Phylum Brachiopoda
“lamp shells”, similar looking to clams but have hairs in & feet out
Phylum Ectoprocta
“bryozoans” aka moss animals
