Volvox Family

Melgar de Tera, Castille and Leon, Spain

Closeup of a zygote. Mucilaginous sheath is visible. Scale bar indicates 50 m. Sample from ponds situated in the vicinity of Lake Constance. The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.For permission to use of (high-resolution) images please contact postmaster@protisten.de.

Casas de Fadoncino, Castille and Leon, Spain

Canada Del Hoyo, Castille la Mancha, Spain

Is a Genus of green algae composed of 8, 16 or sometimes 32 cells held together at their bases to form a sack globular colony surrounded by mucilage.

San Martin De Castaneda, Castille and Leon, Spain

Los Cotos, Comunidad de Madrid, Espaa

Santa Coloma, La Rioja, Spain

Hoyo de Manzanares, Madrid, Spain

Summary[edit] Description: English: Pandorina sp. Date: 15 August 2010. Source: www.flickr.com/photos/giuseppevago/4899052112/. Author: Giuseppe Vago.

Summary[edit] Description: Volvulina steinii Playfair. Date: 1915. Source: Playfair, G.I. 1915. Freshwater algae of the Lismore District: with an appendix on the algal fungi and Schizomycetes. Proceedings of the Linnean Society of New South Wales 40(Part II No. 158): 310–362. Plate XLIII: figs 3, 4 https://www.biodiversitylibrary.org/page/6384706 (cropped for figs 3, 4). Author: George Israel Playfair (1871–1922). Permission(Reusing this file): : This file comes from the Biodiversity Heritage Library. This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing. Deutsch | English | español | français | italiano | македонски | Nederlands | polski | +/−.

Summary[edit] Description: English: Photomicrograph of multiple Pleodorina. Scale=0.02mm. Date: 7 October 2014, 13:08:52. Source: Jon Houseman and Matthew Ford. Author: Jon Houseman. : This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Balance (Color, brightness, and contrast) and adjust background color.

Identifier: celloutlinesofge00hert (find matches)Title: The cell; outlines of general anatomy and physiologyYear: 1895 (1890s)Authors: Hertwig, Oscar, 1849-1922 Campbell, Henry Johnstone, 1850-Subjects: Publisher: London, SonnenscheinContributing Library: MBLWHOI LibraryDigitizing Sponsor: MBLWHOI LibraryView Book Page: Book ViewerAbout This Book: Catalog EntryView All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book.Text Appearing Before Image:ansform themselveswithout further division into globular eggs; in the male colonies,on the contrary, each cell splits up by means of repeated divisions u 290 THE CELL into a bundle of from sixteen to thirty-two spermatozoids (Fig. 158If1). They are extended bodies, bearing anteriorly two cilia, theoriginal green colour of which has been transformed into yellow.The individual bundles separate from the mother-colony, and swimabout in the water. If they meet a female colony, the cilia onboth sides become entangled; by this means the male colony isfixed; it however soon falls to pieces, after which the individualspermatozoids, which become considerably longer, bore theirway into the gelatinous vesicle of the female colony. They thenmake their way to the egg-cells, to which, after they have creptround them, they attach themselves, often in great numbers. Wemay assume that, as has been observed in many other cases, oneof these spermatozoids makes its way into each egg-cell (Sachs). Ml/ il)Text Appearing After Image:Fig. 159.—Volvox globator, sexual, hermaphrodite colony, somewhat diagrammatic repre-sentation constructed from figures by Cienkovsky and Biitschli (after Lang, Fig. 21): smale gamete (spermatozoid); 0 female gametes (eggs). Finally, in Volvox globator (Fig. 159) the differentiation isgreater than ever, for amongst the very numerous cells Avhichconstitute the globular colony some remain vegetative, whilstothers become transformed into sexual cells. Further the eggs(0) are still larger than in Eudorina, and are fertilised by verysmall male elements (s), which swim about with two flagella. If we take all these numerous facts into account, we may surelyconsider the following law as established, i.e. that egg and sperm-cells are derived from reproductive cells, which, to start with, aresimilar and not to be distinguished from one another, but whichbecome differentiated by developing in opposite directions. II. The Physiology of the Process of Fertilisation.Having discussed the morphologNote About Images Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.

Summary[edit] Description: English: Schematic diagrams of the two mechanisms of spheroidal colony formation in the volvocine algae. In Astrephomene, rotation of daughter protoplasts occurs in conjunction with the movement of basal bodies during successive cell divisions. In Eudorina, protoplast rotation is lacking during successive divisions; a spheroidal colony is formed by means of inversion after successive divisions. Date: 9 November 2016. Source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5103382/figure/Fig4/. Author: Yamashita S1, Arakaki Y1, Kawai-Toyooka H1, Noga A1, Hirono M2, Nozaki H3. Author information 1 Department of Biological Sciences, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan. 2 Department of Frontier Bioscience, Faculty of Bioscience and Applied Chemistry, Hosei University, 3-7-2 Kajino-cho, Koganei-shi, Tokyo, 184-8584, Japan. 3 Department of Biological Sciences, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan. nozaki@bs.s.u-tokyo.ac.jp. Permission(Reusing this file): https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5103382/figure/Fig7/.

Illustration pour le livre

Summary[edit] Description: Lobomonas francei P.A.Dangeard. Date: 1899. Source: Dangeard, P.-A. 1899. Mémoire sur les Chlamydomonadinées ou l'histoire d'une cellule. Le Botaniste 6(2–6): 65–290. Page 116, fig. 9 https://biodiversitylibrary.org/page/4867035 (cropped for fig. 9). Author: Pierre Clement Augustin Dangeard (1862–1947). Permission(Reusing this file): : This file comes from the Biodiversity Heritage Library. This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing. Deutsch | English | español | français | italiano | македонски | Nederlands | polski | +/−.

Scale bar indicates 25 m. Sample from the Domnental pond of Kronshagen near Kiel. The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Axioplan with Olympus OM-D-E-M5 MKII.For permission to use of (high-resolution) images please contact postmaster@protisten.de.

Disintegrated parent colony with zygotes. Scale bar indicates 100 m. Sample from ponds situated in the vicinity of Lake Constance. The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.For permission to use of (high-resolution) images please contact postmaster@protisten.de.

O Grove, Galicia, Spain

Canada Del Hoyo, Castille la Mancha, Spain

Galende, Castille and Leon, Spain

Mahide, Castille and Leon, Spain

Hoyo de Manzanares, Madrid, Spain