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Part of the "Branches on the Tree of Life" series. Phylum Mollusca is the second most diverse phylum of animals, with over 100,000 known species. First examined are the basic characteristics of the phylum-a soft body, muscular foot, mantle cavity with gill, and hard calcified shell. Studies the four most familiar classes of molluscs (chitons, gastropods, bivalves, and cephalopods) in depth, viewing structure, life history, adaptations, and ecological interactions.
(Source: DCMP)
Part of the "Branches on the Tree of Life" series. Phylum Arthropoda is the most luxuriant branch on the tree of life. Covers phylum characteristics and three major arthropod classes: Crustaceans (copepods, waterfleas, branchiopods, decapods, and barnacles), Chelicerates (scorpions, pseudoscorpions, spiders, ticks, and mites), and Uniramians (centipedes, millipedes, and insects). Focuses on adaptations, life cycles, and evolutionary relationships in each section.
Part of the "Branches on the Tree of Life" series. Echinoderms are one branch of the deuterostome line of animal evolution, the branch to which Chordates also belong. Covers phylum characteristics and key biological details for five classes: sea stars, brittle stars and basket stars, sea urchins and sand dollars (including developmental stages), sea cucumbers, and crinoids (feather stars).
Part of the "Branches on the Tree of Life" series. The phylum Chordata includes tunicates, sea lancelets, hagfish, and all familiar vertebrate animals. Explores how these seemingly diverse animals evolved and how the group is unified by four characteristic structures: a hollow dorsal nerve chord, a supportive notochord, gill slits, and a post-anal tail. Key milestones in vertebrate evolution include improvements in swimming and feeding, the evolution of paired fins and a primitive lung, movement onto the land, and the emergence of the amniotic egg.
Offers an overview of the basics of scientific classification of all living organisms by arranging and categorizing them into seven main groups: Kingdom, Phylum, Class, Order, Family, Genus, and Species. Gives and explains examples of each group within the animal and plant kingdoms. A science quiz is given after each grouping.
Research in biology would be impossible without a common framework for grouping and distinguishing species. Carl Linnaeus was the first to propose a classification system of organisms. His system developed into the organizational structure used in the life sciences today. Viewers also learn how new scientific names are created and how the existing system has been further refined using DNA studies.
Part of the "Branches on the Tree of Life" series. Begins with a series of observations on Hydra, including habitat, structure, feeding, nematocyst discharge, locomotion (by looping), and its sexual and asexual reproductive strategies. Obelia illustrates the two-stage life cycle found in many cnidarians. Examining the biology of jellyfish (class Scyphozoa), sea anemones, and corals (class Anthozoa) rounds out the overview of phylum Cnidaria.
Part of the "Branches on the Tree of Life" series. Worms with segmented bodies make up the phylum Annelida. Explores the three classes of annelids: Class Polychaeta (feeding, locomotion, and larval stages), Class Oligochaeta (lifestyles, feeding adaptations, and anatomy of freshwater oligochaetes and earthworms), and Class Hirudinea (leeches, crayfish, and worms show adaptations for commensal, parasitic, and scavenger lifestyles). DNA evidence places annelids close to the molluscs on the tree of life.
Showing collections 1 to 2 of 2
Resources to teach younger students about animals
A collection containing 58 resources, curated by DIAGRAM Center
Biology related concepts
A collection containing 59 resources, curated by Benetech
