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Biology >
Plants_and_Animals >
Animalia
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Plants_and_Animals >
Animalia >
Annelida
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Plants_and_Animals >
Animalia >
Echinodermata
- Sea Stars, Sea Urchins and Other Echinoderms - Information about this phylum and its species. Includes scientific names, distribution, habitat, size, and images.
- Divebums Echinoderms - Offers underwater photographs of various species of sea cucumbers, sea urchins, sea stars, and brittle stars. Includes scientific names.
- Echinoderms Up Close - Presents photographs of Lytechinus variegates, Culcita novaeguineae, Ophiomastix annulosa, and Protoreaster lincki. By S. Hottenrott.
- Echinoderms 1 - Features images of echinoderm fossils. Data include age, place of discovery, and price.
- Reef Ecology Guide Echinoderms - Offers images of various species of sea stars, feather stars, sea urchins, and sea cucumbers. Site sponsored by Dive Asia Phuket Thailand.
- Natural Canvas Fossils: Fossil Echinoderms - Presents images of Deltoblastus, Scytalocrinus, Glypticus, Polydiadema, and Gyrocystis.
- Science Kit and Boreal Laboratories: Echinoderms - Offers preserved starfish and brittle star, starfish anatomy display mount, and starfish dissection model. With prices.
- Invertebrates: Echinoderms - Offers taxonomic index, species links and locations.
- Reeforg Echinoderms - Offers information about sea star, wana, ina, sea cucumber, and pencil slate sea urchins.
- Kermadec Islands Images of Echinoderms - Features underwater photographs of black seven-armed star, pencil urchin, crown of thorns star, and diadema stars found in this area.
- Echinoderms in Aquaria - Presents characteristics, traits, and features of crinoids, asteroids, marble stars, linckia stars, and Caribbean cushion star.
- Ordovician Echinoderms - Offers images of fossils in this era. Includes locations of discovery.
- Photocean: Echinoderms of the Lembeh Strait - Offers images of banded brittle seastars, red crinoids, and radiant sea urchins in this area in Sulawesi, Indonesia. Photographs by Gail J. Worth.
- Fossilsearch Echinoderms - Offers fossils of this phylum from the Devonian, Silurian, and Ordovician periods. Includes images, conditions, and prices.
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Geometry
- Wilson's Inversive Geometry - Proving theorems using the Klein viewpoint and some CabriJava illustrations.
- Xah Lee's Home Page - Includes a visual dictionary of famous plane curves, illustration of common surfaces, information on discontinuous groups of rotation and translation in the plane, and projective geometry.
- Wallpaper Groups - Provides illustrations and information on different plane symmetry groups.
- Peek - Program for N-dimensional polytope visualization.
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Geometry >
Algebraic_Geometry
- Algebraic Curves - A discussion on parabola, Cassini's oval, conchoid of Nichomedes, and limacon of Pascal.
- The Algebraic Geometry Notebooks for Non-Experts - Includes definitions, discussion of theorems, varieties, orbits and orbit-spaces as well as classification of curves.
- The Brill-Noether Project - A proposal to answer the basic questions in the theory involving vector bundles on algebraic curves. Open to contributions and linkage to related information.
- Introduction to Algebraic Geometry - Provides definition of terms through several examples. Includes instructions for running said examples using computer programs.
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Geometry >
Computational_Geometry
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Geometry >
Software
- Isard - Downloadable geometry software that can create and interactively manipulate different geometric forms.
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