Chapter 5 coelenterata
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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

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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


5 1 morphology hydromedusae

§5.1 MorphologyHydromedusae


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


  • 5 2 class hydromedusae

    §5.2 Class Hydromedusae


    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 limnomedusae

    本目共4科。

    Family Moerisiidae

    Tiaricodon

    (三) Order Limnomedusae


    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


    5 3 class scyphomedusae

    §5.3 Class Scyphomedusae

    一、Morphology


    Chapter 5 coelenterata

    (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


    Chapter 5 coelenterata

    (二) 内部形态:

    • Digest system;

    • Gastrovascular system:

    • Nervous system and sense organs:

    • Reproduction:diovcious


    Clasification

    二、Clasification


    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


    5 4 biology and significance

    §5.4 Biology and Significance


    Biology

    Biology


    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


    Feeding habits

    (二) Feeding habits


    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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