Achaeplatida Flashcards
Achaeplatida
The “planea” supergroup
Glaucophyta
Eukaryotic green algae
- > fresh water organism
- > peptidoglycan wall
- > Chl a (no b) & red and blue pigments
Phylum Rhodophyta
Red Algae
- > chl a, d (synapmorphy), phycoerythrin phycocyanin (both blue)
- > No flagella
- > Has cellulous
- > contains agar (bacteria growth)
- > Carrageenan (thickening agent)
Alternation of generations
Organism goes between a sexual phase (gametophyte) that produce gametes and an asexual phase (sporophyte) that produce carpospores
Isomorphic vs heteromorphic
Isomorphic-> Generations look the same
heteromorphic -> generations look different
Genus Pyropea spp. Life cycle
Noir for sushI! Heteromorphic and mostly haploid stage (gametophyte)
- > a single gametophye contains both M & F
- > Sperm from sporangium falls onto caropgenium egg and fuse
- > Now it is diploid carpgenium, release carpospore
- > lands on molesc shell
- > Now a sporophyte undergoes meiosis to make miospores to attach to rocks and grow to a gametophyte
The life cycle of Polysiphonia
Calcified and stiff algae. 2 sexes of individuals. 3 generations
- > releases sperm onto stick thing trichogyne (^ SA) of caropserangium
- > NEW GENERATION Heteromorphic: Forms a cup (pericup) where inside is diploid
- > Releases carpospores that become an isomorphic sporophyte
- > undergoes meiosis and releases spore to become gametophyte
Corallina
Hard, rigid, calcified, found in coal reefs
Lithothamnion
red algae encrusted on coal and rocks, calcified, deep waters
Chondrus
Irish moss harvested on the west coast for agar and carrageenan
Palmaria
east coast, sheet form, common in food
red algae pigments
CHL a, phycocyanin, allophycocyanin (blue-green), phycoerythrin, CHL d
hermaphroditic
Possessing the reproductive organs of both sexes.
Glacopyta
Eukaryotic unicellular algae
- > fresh water
- > Ch a phylocyan and alopylocyan
- > first captured chloroplasts?
- > Peptogycan wall
- > unclear relationship to archeplastida
