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Invertibrates
- 2. Classification of the Phylum Annelida ✘The animal group who are triploblastic, coelomate and bodies are segmented and covered with soft cuticle is known as annelida. ✘3 Classes of Annelids ✗Class I: Polychaeta ✗Class II: Oligochaeta ✗Class III: Hirudinea
- 3. Class I: Polychaeta Characteristics: ✘1. Most of them are marine and variously colored. ✘2. Each segment bears a lateral fleshy outgrowth help in swimming. These appendages are known as parapodia. ✘3Body is with a distinct head, head with eyes, pulp and tentacles. ✘4. Clitellum is absent. ✘5. Generally unisexual, fertilization external. ✘6. Development through trochophore larva. Myrianida pachyceraAphrodita aculeata
- 4. Class II: Oligochaeta Characteristics: ✘1. Either freshwater or terrestrial forms. ✘2. Head indistinct and without head appendages. ✘3. Parapodia and bristles absent and setae remain embedded in the skin. ✘4. Clitellum present. ✘5. Sexes united, gonads few, development direct Eisenia andreiPerionyx excavatus
- 5. Class III: Hirudinea Characteristics: ✘1. Mostly aquatic forms but a few may be terrestrial. ✘2. Body dorsoventrally flattened ✘3. Head distinct, without head appendages, may bear eyes. ✘4. Parapodia, absent. ✘5. Two sucker ✗Posterior used for adhesion ✗Anterior one suction. ✘7. Fertilization internal, development direct, and are hermaphrodite. Hirudo medicinalisErpobdella obscura
- 6. Class Habitat Reproduction Development Clitellum Polychaeta Marine Hermaphrodite Trochophore larva Absent Oligochaeta Freshwater or terrestrial Hermaphrodite Direct Present Hirudinea Aquatic but Few terrestrial Hermaphrodite Direct Present
- 7. Arthropod ✘Is an invertebrate animal having an exoskeleton, a segmented body, and jointed appendages ✘5 Classes of Arthropod ✗Class I: Diplopoda ✗Class II: Chilopoda ✗Class III: Crustacea ✗Class IV: Arachnida ✗Class V: Insecta
- 8. Class I: Diplopoda Characteristics: ✘Round body ✘Segented body ✘Two pairs of legs per segment ✘Also known as myriapods ✘"Thousand feet" ✘Example: millipedes Ommatoiulus sabulosus Narceus americanus
- 9. Class II: Chilopoda Characteristics: ✘Flattened body ✘Segmented body ✘One pair of legs per segmet ✘"Hundred feet“ ✘Example: centipedes Scolopendra polymorpha Scolopendra morsitans
- 10. Class III: Crustacea Characteristics: ✘Hard ✘Flexible exoskeleton ✘Gills ✘Branched antenna ✘Two body sections - abdomen, cephalothorax ✘Mostly aquatic Planes minutusNephropidae
- 11. Class IV: Arachnida Characteristics: ✘Two body sections - abdomen, cephalothorax ✘No antennae ✘Four pairs of legs ✘Chelicerae ✘Pedipalps ✘Spinnerets Araneus diadematusEuscorpius carpathicus
- 12. Class V: Insecta Characteristics: ✘Three body sections (Head, Thorax, Abdomen) ✘One pair of antennae (unbranched) ✘Three pairs of legs ✘Mandible Schistocerca gregaria Musca domestica
- 13. ECHINODERMS ✘The Echinoderms are triploblastic, coelomate animals. ✘They possess a water vascular system. ✘Their endoskeleton is covered by epithelium ✘5 Classes of Echinoderms ✗Class I: Asteroidea ✗Class II: Ophiuroidea ✗Class III: Echinoidea ✗Class IV: Holothuroidea ✗Class V: Crinoidea
- 14. Class I: Asteroidea Characteristics: ✘Body is star-like. ✘Five arms are usually present which are not sharply marked off from the central disc.
- 15. Class II: Ophiuroidea Characteristics: ✘Body is star-like ✘The arms are not joined to each other and the body and arms are clearly separated. ✘Example Brittle Star
- 16. Class III: Echinoidea Characteristics: ✘Body is globular or disk like. ✘They have a specialized mouth part with teeth to scrape food from rocks.
- 17. Class IV: Holothuroidea Characteristics: ✘Body is elongated and cylindrical. ✘Oral end has mouth surrounded by tentacles.
- 18. Class V: Crinoidea Characteristics: ✘Body has a central disc which is attached to the substratum. ✘They are free living or they are attached by an aboral stalk of ossicles.
- 19. Hemichordate ✘Is a phylum of marine animals, generally considered the sister group of the echinoderms. ✘ They appear in the Lower or Middle Cambrian ✘2 Classes of Hemichordate ✗Class I: Enteropneusta ✗Class II: Pterobranchia
- 20. Class I: Enteropneusta Characteristics: ✘They live in shallow water. ✘They are worm like animals. ✘They live in burrows on sandy shorelines. ✘Their body is divided into three regions: ✗Proboscis ✗Collar ✗Trunk. ✘Example: Acorn Worm
- 21. Class II: Pterobranchia Characteristics ✘They have two or more arms. ✘They are often colonial. ✘They live in an externally secreted encasement.
Hinweis der Redaktion
- Triploblastic= animal that has three primary germ layers during embryonic development. Coelomate= having a cavity between the body wall and the digestive tract
- Appendages= A part or organ, such as an arm, leg, tail, or fin, that is joined to the axis or trunk of a body. Parapodia=muscular bristle-bearing appendages used in locomotion, sensation, or respiration. Clitellum=body wall, that secretes a sticky substance during copulation.
- Clitellum=body wall, that secretes a sticky substance during copulation.
- 1. Mostly aquatic forms, either fresh water or marine, but a few may be terrestrial.
- Spinnerets= silk-producing organ: a tiny tubular structure, usually one of two pairs, that exudes the fluid produced by the abdominal glands of a silk-producing Chelecerae= mouthpart of arachnid: either of the first pair of mouthparts that, resembling fangs or pincers and used to grab or poison prey Pedipalps =part of spider's mouth: either of a pair of appendages that are part of the mouths of spiders and other arachnids
- Flies Locust
- Epithelium= Thin protective layer of tissue: a thin layer of tightly packed cells lining internal cavities, ducts, and organs of animals and covering exposed bodily surfaces, especially in wounds that are healing