Current Biodiversity (part 4) Flashcards
what does segmentation allow?
increased size (“copy”/”paste”), increased diversity
what does a complete gut allow?
increased size; can eat and digest at the same time
what does vascularization allow for?
bigger bc of closed circulation and have a delivery system (instead of diffusion), increased size, decreased predation, move more efficiently
chaetae
bristles on annelids that allow for defense, sensory, movement
what are chaetae made of?
chitin
protostomia
develop mouth 1st
- annelids and platyhelminthes
deuterostomia
develop anus 1st
- animals w/ spines
most diverse phyla
arthropods (insects)
2nd most diverse phyla
mollusca
“pen”
internal shell (squids and octopi)
radula
allow for feeding; sand-paper texture, scrape w/ sharp tongue (algae, etc.)
gills allow for… and folds in gills allow for…
- better gas exchange
- increased surface area = increased exchange
Mollusca is more closely related to ___ than to platyhelminthes bc…
annelids bc… molluscas and annelids have coelems
modular body plan
generalized body plan w/ some diferences
chromatophores
allow for squids/octopi to change color/texture
cephalopods have the unique ability to…
change appearance (color/texture) in response to vibrations/external stimuli; allows them to camouflage
the most diverse phyla of animals is…
arthropoda
arthropods account for about __% of all known species
90%
arthropods are the first to use the biome/ecosytem of…
air
difference between tagmatization and segmentation
tagmatization includes specialized segments w/ functional groups (not just all the same segments repeated)
arthropods skeletons are made from
chitin and protein
arthropods have the first __ (anatomical thing)
respiratory lungs
what is the benefit of having different life stages?
reduces (infraspecific) competition between offspring/parents bc at diff life stages they have diff environments/food
ecdysis
shedding of outer layer/molting
