1 / 29

Chapter 5 Coelenterata

Chapter 5 Coelenterata. 浮游水母类的一般形态、分类、 生物学与经济意义. General features. two primary lays: outer ectoderm and inner endoderm radial symmetry Class Hydromedusae Class Scyphomedusae. §5.1 Morphology Hydromedusae. External features. Form ： polypoid and medusoid

risa-sargent
Télécharger la présentation

Chapter 5 Coelenterata

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 5 Coelenterata 浮游水母类的一般形态、分类、 生物学与经济意义

  2. General features • two primary lays: outer ectoderm and inner endoderm • radial symmetry Class Hydromedusae Class Scyphomedusae

  3. §5.1 MorphologyHydromedusae

  4. External features • Form：polypoid and medusoid • Morphology • umbrella: exumbrella and subumbrella • Velum and pseudovelum • Manubrium and mouth lips • Tenacle: marginal and oral tentacles • Nematocyst： • morphology: operculum, capsule and thread • classification

  5. Internal features • Gastrovascular System： gastrovascular-cavity • Muscular System：radial and circular fibers • Nervous and Sensory Cell： • nerve net • ganglion cell • neurosecretory cell

  6. √Sensory Organ • pigment cell • statocyst: • open marginal vesicle • closed marginal vesicle • free marginal sensoty club • enclosed marginal sensoty club • Reproduction： • dioecious，gonads situated on the radial canals or inside stomach

  7. §5.2 Class Hydromedusae

  8. Hydromedusae • >2000 species，6 orders： • velum • presence or absence ocelli and statocysts • position of gonads • type of life cycle

  9. (一) Order Anthomedusae • 本目有22科，介绍常见4个科。 • 1、Family Tubulariidae • Euphysora • 2、Family Bougainvilliidae • Koellikerina • 3、Fmaily Velellidae：one genus，one species • 4、Family Randeidae • Leuckartiara厦门隔膜水母

  10. （二） Order Leptomedusae • 本目12科，我国记录9科，介绍常见4科。 • 1、Family Campanulariidae: • Phialidium: P. chengshanense • Obelia • 2、Family Eirenidae: • Eirene • 3、Family Eutimidae • Eutima • 4、Family Aequoreidae • Aequorea

  11. 本目共4科。 Family Moerisiidae Tiaricodon （三） Order Limnomedusae

  12. （四） Order Trachymedusae: • Family Geryoniidae: Liriop: L. tetraphylla • Family Rhopalonematidae Aglaura: A. hemistoma

  13. （五） Order Narcomedusae • Family Aeginidae: • Solmundella bitentaculata • Aegina citrea

  14. （六） Order Siphonophora • Specialized group of medusae with polymorphic colony

  15. Morphology of Siphonophora • Modified medusoid and polypoid inviduals： • Polypoid zooids： • gastrozooids； • dactylozooids； • gonozooids； • Medusoid forms： • nectophore； • pneumatophore； • gonophore； • bract；

  16. Classification of Siphonophora: • Suborder Disconanthae ：Family Porpitidae • Suborder Cystonectae：Family Physaliidae： • Suborfer Physonectae：Family Agalmidae Agalma elegans • Suborder Calysophorae ：Family Diphyidae • Diphyes • Muggiaea

  17. §5.3 Class Scyphomedusae 一、Morphology

  18. （一） 外部形态 • Lappet • Sense Organs： rhopalium, ocelli • Oral arms： • 附属物：感觉功能。 • 生殖下穴： • Marginal Tentacles：solid or hollow

  19. （二） 内部形态： • Digest system； • Gastrovascular system： • Nervous system and sense organs： • Reproduction：diovcious

  20. 二、Clasification

  21. 1 Key to Class Scyphomedusae 1 Cubical umbrella form.................................Cubomedusae Umbrella not cubical form...........……….........……...…..2 2 Exumbrella with a circular, coronal furrow....Coronatae Exumbrella without a furrow.........…........……………...3 3 Oral arms free.............................................Semaeostomeae Oral arms fused.............................................Rhizostomeae

  22. §5.4 Biology and Significance

  23. Biology

  24. （一）Distribution • Cold water species: Cyanea capillata • Warm water species: Aglaura hemistoma,Velella velella, Porpita porpita, Physalia physalia etc. • Coastal species: many species of Anthomedusae, Leptomedusae, Limnomedusae, Semaeostomeae and Rhizostomeae

  25. （二） Feeding habits

  26. （三） Reproduction • dioecious without sexual dimorphism • 1 sexual cells； • 2 fertilization； • 3 development;

  27. （四） Life cycle： • Alternation of generations： • zygote → blastula → planular larva → attachment → hydranth • Without alternation of generations：

  28. Significance • Beneficial • Fisheries • Medical use • Harmful

More Related