Phylum Lophotrochozoa Flashcards
what are the phylum in Lophotrochozoa? (there is 4)
- Rotifera
- platyhelminthes
- mollusca
- annelida
describe the general characteristics of phylum rotifera.
- wheel organ/corona
- mastax and pseudocoelomate
3.eutely - filter feeder
- no circulatory system
- all female exception when stressor (myxis)
describe the general characteristics of phylum platyhelminthes.
- free-living or parasitic (many)
- acoelomate
3.bilateral symmetry - organ-level development
- syncytical tegument
- gastrovascular cavity (or none)
what are the classes in phylum platyhelminthes? (there is 4)
Turbellaria: Free living flat worms
Trematoda: Parasitic flukes. Have complex life
Monogenea: Monogenic fluke. Have one host.
Cestoda: tapeworms
describe the general characteristics of phylum mollusca.
- eucoelomate
- bilateral symmetry
- open or closed (in cephalopods) circulatory system
- ctenidial gills
- huge, diverse group- probably 3rd largest phylum
what are the classes in phylum mollusca? (Theres 3)
Gastropod: Snails and slugs
Bivalvia: two halves of a shell. Clams
Cephalopoda: Little or no shell. Closed circulatory system. Squid, Octopus, Cuddle fish
describe the general characteristics of phylum annelida.
- closed circulatory
- eucoelomate
3.gills or epithelial gas exchange - setae/cheatae -chitinous bristles
- proteinaceous cuticle
what are the classes in phylum annelida? (there is 3)
Polycheata (polyphyletic)
Oligachaeta (paraphyletic)
Hirudinae
What is myxis in rotifera?
Population is typically only females who reproduce asexually. During stressful
times, they undergo parthenogenesis and produce fertilized embryos → create males → males create more fertilized embryos. Leads to variation.
What are the segments of annelida in order? (there are 4)
- Prostomium
- Peristomium
- Trunk
- Pygidium
