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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

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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
General features
  • two primary lays: outer ectoderm and inner endoderm
  • radial symmetry

Class Hydromedusae

Class Scyphomedusae

external features
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
internal features
Internal features
  • Gastrovascular System:

gastrovascular-cavity

  • Muscular System:radial and circular fibers
  • Nervous and Sensory Cell:
    • nerve net
    • ganglion cell
    • neurosecretory cell
sensory organ
√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
hydromedusae
Hydromedusae
  • >2000 species,6 orders:
    • velum
    • presence or absence ocelli and statocysts
    • position of gonads
    • type of life cycle
order anthomedusae
(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
order leptomedusae
(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
order trachymedusae
(四) Order Trachymedusae:
  • Family Geryoniidae:

Liriop: L. tetraphylla

  • Family Rhopalonematidae

Aglaura: A. hemistoma

order narcomedusae
(五) Order Narcomedusae
  • Family Aeginidae:
    • Solmundella bitentaculata
    • Aegina citrea
order siphonophora
(六) Order Siphonophora
  • Specialized group of medusae with polymorphic colony
morphology of siphonophora
Morphology of Siphonophora
  • Modified medusoid and polypoid inviduals:
    • Polypoid zooids:
      • gastrozooids;
      • dactylozooids;
      • gonozooids;
    • Medusoid forms:
      • nectophore;
      • pneumatophore;
      • gonophore;
      • bract;
classification of siphonophora
Classification of Siphonophora:
  • Suborder Disconanthae :Family Porpitidae
  • Suborder Cystonectae:Family Physaliidae:
  • Suborfer Physonectae:Family Agalmidae

Agalma elegans

  • Suborder Calysophorae :Family Diphyidae
    • Diphyes
    • Muggiaea
slide18
(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
slide19
(二) 内部形态:
  • Digest system;
  • Gastrovascular system:
  • Nervous system and sense organs:
  • Reproduction:diovcious
1 key to class scyphomedusae
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

distribution
(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
reproduction
(三) Reproduction
  • dioecious without sexual dimorphism
    • 1 sexual cells;
    • 2 fertilization;
    • 3 development;
life cycle
(四) Life cycle:
  • Alternation of generations:
    • zygote → blastula → planular larva → attachment → hydranth
  • Without alternation of generations:
significance
Significance
  • Beneficial
    • Fisheries
    • Medical use
  • Harmful
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