Arthropod (crayfish) Dissection Megan Williamson period: 3 4/29/13 Objectives: The purpose of this lab was to study and observe the organs in a crayfish and be able to name them. Introduction: Crayfish belong to the kingdom animilia‚ phylum arthropod and class crustaceans. The body is divided into three parts‚ the body‚ the head‚ thorax‚ and abdomen. The head and thorax are apart of a segment called cephalothoraxes‚ which is covered by the carapace made of chitin
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The phylum Arthropoda is the largest and most varied in the animal kingdom. It includes well over one million described species. This represents approximately three-quarters of all known biological organisms‚ living or extinct. Countless arthropods remain undescribed (not yet named and studied)‚ and the actual number of living species could be as high as ten million or more. Some of the more well known arthropods include insects‚ crustaceans‚ and spiders‚ as well as the fossil trilobites. Arthropods
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sponges have symmetry and the jellyfish is radial. The roundworm and the flatworm are both bilateral symmetry. 2. List all of the Phyla that show cephalization. The Phyla that show cephalization are: Platyhelminthes‚ Nematode‚ Annelida‚ Mollusca‚ Arthropoda‚ and the Chordata. (esu.edu) 3. Do all organisms on the table have three germ layers (endoderm‚ ectoderm‚ and mesoderm)? If not‚ which phyla have fewer than three germ layers? No‚ not all organisms on the table have three germ layers such as
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Arthropoda The phylum Arthropoda‚ being the largest phylum in all of the kingdom Animalia‚ makes up about 84% of all known animal species. From tiny terrestrial insects to the aquatic king crab equipped with a 12 foot arm span‚ arthropods are evident in every habitat on Earth. Despite the diversified phylum‚ all members share a basic body structure containing a jointed skeletal covering with jointed appendages. An arthropod’s unique jointed exoskeleton provides support as well as locomotion
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Onychophora‚ Arthropoda‚ Platyhelminthes‚ Brachiopoda‚ Mollusca‚ and Annelida. Nematoda‚ Onychophora‚ and Arthropoda are classified and the Ecdysozoa group. Platyhelminthes‚ Brachiopoda‚ Mollusca‚ and Annelida are classified as the Lophotrochozoans. Possessing the traits of a psuedocoelomate and thrashing‚ was Nematoda. Although classified low on the cladogram‚ Nematoda are highly diverse and complex metazoans (Paul De Ley). Onychophora‚ and Arthropoda share the trait of segmentation‚ but Arthropoda additionally
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Virtual Systematics Lab: Introduction to Systematics Worksheet Learning Goal: To learn how biologists classify species based on their evolutionary relationships. Prerequisite Knowledge: Before beginning this lab‚ you should be familiar with these concepts: why biologists today use the three-domain system of classification how evolutionary trees depict biologists’ understandings about the evolutionary relationships among groups of organisms Introduction: Almost every place on Earth‚ from the surface
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(Intro to Animals)‚ 33 (Protostomes)‚ 34 (Deuterostome) and Fungi __C___ 1. A crab is a member of the phylum a. cnidaria b. mollusca c. arthropoda d. annelida e. ctenophore ___E__ 2. When asked‚ you tell a child that a centipede is a a. member of the class insecta b. part of the largest phylum arthropoda‚ related to the lobster c. part of the subphylum cheliceriformes d. part of the subphylum myriapoda e. B and D above (told in different short
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beneficial and detrimental aspects of insects (to man) Definition of “pest” – difference between key‚ secondary‚ and sporadic pests General characteristics of Phylum Arthropoda Characteristics of Class Insecta Phylogeny and Systematics of the Arthropods Major distinguishing characteristics of members of Phylum Arthropoda Major distinguishing characteristics of Class Insecta Classification of Biological Organisms Difference(s) between conventional taxonomy and systematics Concept
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Biodiversity study guide 1. Briefly describe how our species started to appreciate the biodiversity of the planet (in a geographical and historical context)? Through the concept of evolution‚ ecology‚ population‚ community and the environment. Species through different periods evolve physiologically and adapting to new environments. Animals who can’t live or survive in certain regions either migrate or die. Common ancestors often link to present day organisms showing biologically and different
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Phylum Cnidaria 4.Phylum Ctenphora 5.Salps 6.Larvaceans 7.Phylum Chaetognatha 8.Mollusks and Annelids Copepods -Phylum Arthropoda -Subphylum Crustacea -Exoskeleton that is molted -Segmentation -Jointed appendages -One of most dominant groups of zooplankton -Active filter feeders -The head has a single central eye and two antennae. Krill -Phylum Arthropoda -Subphylum Crustacea -The largest krill species‚ the Antarctic Euphausia superb congregate in huge swarms near the surface
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