Invertebrate Diversity Part 3: Introduction to Arthropods

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    • avatar Ed Thoreum 1

      mouth parts( chelicerata & mandibulata ) 6:00

      • avatar Da Mobb 1

        during the carboniferous time. large dragonflys and arthropods do exist. i heard because of the increase in oxygen concentration in the air

        • avatar GhostHazard 1

          Thank you!

          • avatar Hugh Talmage 0

            So helpfull

            • avatar Novelle Cammock 0

              Very helpful !!!

              • avatar Victor Diaconescu 1

                about the size of arthropods… there were huge terrestrial arthropods in the Permian, therefore arthropods aren't limited by their exoskeleton in growth

                • avatar Josh Hill 1


                  • avatar shauda19 1

                    These videos are very, very helpful. Just one thing though… I guess classifications have changed since you did this video. It's 2014 now and what I've learnt in class is that there are four sub-phyla (Trilobita, Crustacea, Chelicerata & Uniramia). The classes under Chelicerata are; Xiphosura (horseshoe crab), Pycnogonida (Giant Sea Spider), & Arachnida with the Orders – Aranae (spiders), Scorpiones (scorpions), Pseudoscorpiones (pseudoscorpions), Opiliones (Daddy-long-legs), & Acarini (ticks & mites). The classes under Crustacea are Malacostraca, Phyllopoda, Anostraca, Copepoda and Cirripedia.

                    • avatar ebrahiem123 0

                      9. Why, even thoough they have an open circulatory system, can flying insects like flies beat their wings with great speed?
                      In insects the circulatory system is open but this system does not participate in the gas exchange process and in oxygen supply to the tissues. Gases go in and out through the independent tracheal system that allows direct contact of cells with the ambient air. Therefore an insect can supply the great oxygen demand of its fast-beating wing muscles even having open circulatory system.

                      • avatar XMIR10C 1

                        Phylum Arthropoda is the largest by number of species only. The largest Phylum by total individual organisms is Phylum Nematoda (roundworms): "They are found in every part of the earth's lithosphere.[4] They represent, for example, 90% of all life forms on the ocean floor.[5] Their numerical dominance, often exceeding a million individuals per square meter and accounting for about 80% of all individual animals on earth"

                        • avatar CardManiac 1

                          I still don't get it, can they be big and active if they have an incomplete circulatory system? Explain please.

                          • avatar Zen Madster 1

                            I wish youtube had more videos like this, perhaps at the college level though, and less moronic videos.

                            • avatar Alexander Alsén 1

                              @Anna Symmetries are not defined at the molecular level, but rather at the morphological.
                              Sure they have more similar genes to bilaterial animals, and are nested in the group "Bilateria", but saying they are bilateral molecularly doesn't make any sense to me. Other than that I get your point.

                              • avatar fransic220 0

                                that is actually not entirely correct, they evolved from a bilateral ancestor and only their larva forms still show bilateral symmetry. So in the sense that they are bilateral molecularly is only partially true, as they are now sessile with radial symmetry. Echinoderms or the sea stars are technically pentaradial, given that they have 5 arms which all store the same organs.