Phycology order volvocales
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My crude presentation on the Oder Volvocales of the Algae family. I used visual presentation of the examples of each class, reproduction, habitat, etc
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Phycology order volvocales
- 1. Reporter: Adrian Fabian Alcaraz Proud BS Bio 4A Includes about 60 genera and 500 species
- 2. Unicellular or colonial Motile throughout their life or forming colonies of palmelloid forms or dendroid forms Usually fresh water Chloroplast are usually cup or basin shaped with a single pyrenoid. Asexual reproduction by biflagellate zoospores‚ aplanospores ‚ or palmella stages Sexual reproduction varies from isogamy to oogamy
- 3. Suborder Chlamydomonadineae Family Chlamydomonadaceae Family Sphaerellaceae Family Polyblepharidaceae Family Phacotaceae Suborder Tetrasporineae Family Tetrasporaceae Family Palmellaceae Suborder Chlorodendrineae Family Chlorodendraceae
- 5. Unicellular May be biflagellate or quadriflgellate Asexual reproduction takes place by zoospores or palmella stages Sexual reproduction is mostly isogomous
- 6. Widely distributed on fresh water (rainwater ponds‚ pools‚ ditches‚ laboratory aquaria‚ moist soils) Waters rich in ammonium compounds Salt waters (C. halophila) Snow (C. yellowstonensis)
- 7. Measure about 0.02mm Spherical‚ ovoid‚ sub-cylindrical ‚ ellipsoidal Chloroplast: Single cup shape Reticulate Stellate Discoid Single pyrenoid ‚ some lack pyrenoid Two contractile vacuoles at the base of the flagella Tiny photoreceptive eye-spots at the anterior end.
- 8. cellulosic wall cell membrane chloroplast mitochondria nucleus flagella eyespot cytosol starchpyrenoid Chlamydomonas contractile vacuole
- 9. Discoid ChloroplastReticulate ChloroplastSingle cup ChloroplastStellate Chloroplast
- 10. Asexual reproduction: Zoospores Aplanospore formation Hypnospores Palmella stage
- 11. Sexual reproduction: Isogamous reproduction
- 12. Sexual reproduction: Anisogamous reproduction
- 13. Sexual reproduction: Oogamous reproduction
- 15. Zygotes and its germination
- 19. Includes all motile colonial genera Cells of the colony lie in a disc or in a hollow sphere. The number in a colony is fixed an is a multiple of two. Asexual reproduction is by daughter colony Sexual reproduction ranges rom isogamy to oogamy
- 20. Widely distributed on fresh water (ponds‚ ditches) Motile colony Subspherical to ellipsoidal in shape It consists of usually 16 (rarely 8 or 32) biflagellate cells embedded in a gelatinous matrix
- 24. Widely distributed on fresh water (ponds‚ ditches) Coenobia are usually spherical or ovoid an larger than Pandorina Composed of 32 (rarely 16 or 64) cells
- 27. Motile forms which cells lie in a disc or a hollow sphere Number of cells is definite and constant rom juvenile to adult (coenobium) Asexual reproduction by formation of daughter colonies Sexual reproduction varies rom isogamy to oogamy through anisogamy
- 29. Widely distributed on fresh water (rainwater ponds‚ pools‚ ditches‚ sometimes lakes) The coenobia appear in rainy season and disappear with the beginning of summer
- 30. A colony is comprised of 500-60,000 cells All cells are arranged in a single layer within a periphery of colonial matrix Covered by a marked mucilaginous lamella Internally occupied by a gelatinous material