Exam (elaborations)
BIO 112 final exam invertebrates and vertebrates
- Course
- Institution
BIO 112 final exam invertebrates and vertebrates
[Show more]
Content preview
BIO 112 final exam invertebrates andvertebrates
Annelid Diversity - ANS-bristle worms, tube worms, earthworms, leeches
Annelida - ANS-Lophotrochozoan, segmented worms
segmentation= external and internal features are repeated
Reduced in leeches
Soft body: segmented true coelom acts as hydrostatic skeleton
Well-developed organ systems
Closed circulatory system
Alimentary canal w/ specialized areas
Intake: mouth and pharynx, then esophagus
Storage: crop
Mechanical digestion and absorption: intestine
Waste expelled: anus
Metanephridia expel metabolic waste and osmoregulate
1. Coelomic fluid collected 2. Useful solutes reabsorbed into blood 3. dilute urine
expelled
Separate sexes or hermaphroditic
Marine species: trochophore larvae
Earthworms: direct development
Arthopoda diversity - ANS-chelicerates, myriapods, crustaceans, hexapods
Basal eumetazoans - ANS-Cnidaria and Ctenophora
bristle worms - ANS-active marine predators w/ jaws
Fleshy parapodia and chitinous bristles
Chelicerates clade - ANS-Ecdysozoans: arthropoda: chelicerates,
Feed using chelicerae
Claw-like appendages
Poisonous fangs in spiders
Body plan: cephalothorax + abdomen
No antennae
First ones were marine and freshwater eurypterids
Today, the only aquatic chelicerates are marine horseshoe crabs and sea spiders
Marine sea spiders are piercing-sucking carnivores (not spiders)
Most are arachnids
Land predators are arachnids
1 pair pedipalps + 4 pair walking legs
Arachnids include
, Predatory scorpions and spiders
Parasitic ticks and mites
Chordates - ANS-an animal phylum that has a notochord, a dorsal hollow nerve cord,
and gill slits at some time in its life cycle
Present in embryos; not always in adults
Class Bivalvia - ANS-Lophotrochozoans: mollusca
Class bivalvia: bivalves 2 part shell joined by hinge
No distinct head
Freshwater or marine: suspension-feeders
Filter-feed with ciliated gills; no radula
Burrowing or sessile
Class Cephalopoda - ANS-Lophotrochozoans: mollusca
Mostly active marine predators
Foot modified into grasing arms and tentacles (w/suckers)
Beak-like jaws, often w/ poison
Well developed eyes and brain
Water-jet propulsion: excurrent siphon + mantle cavity
Protective ink and skin color changes
nautilus - only living cephalopod w/ external shell
Squid to cuttlefish- reduced internal shell
Octopus- no shell; biggest brain
Class gastropods - ANS-Lophotrochozoans: mollusca
Largest class: land, freshwater, marine
Single shell or no shell
Viscera twists so that mantle cavity lies over head-end (allows retraction into shell)
Feed with radula
Some graze on plants, algae, bacteria
Some are predators
Some are freshwater snails
Schistosomiasis hosts- three species that help spread infection
Many are marine snails
Some are marine shell-less sea slugs and nudibranchs
cnidaria reproduction - ANS-- sexual or by budding
-gonads reproduce eggs and sperms
- many cycle thru polyp form and medusa form... ex obelia
Crustaceans clade - ANS-Mostly marine and freshwater; some land
Predators, herbivores, scavengers, filter-feeders, and a few parasites
2 pair antenna; feed with chewing mandibles
Many legs
Lobster, shrimp, crayfish, krill, crabs, also pillbugs, sowbugs, rollipolle
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller LUCKYSTAR2022. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
79373 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now