Classification of Cnidaria

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CO 13
Phylum Cnidaria
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Over 9,000 species in the phylum Cnidaria
Equipped with specialized cells: cnidocytes
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Fossil specimens dated to over 700 million
years ago
Extant species
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Contain a specialized stinging organelle, the
nematocyst
Most common in shallow marine environments
Some freshwater
None are terrestrial
Fig. 13.1
Phylum Cnidaria
Classification of Cnidaria
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Class Hydrozoa
Class Scyphozoa
Class Staurozoa
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指狀個蟲
No medusae in life cycle but polyp topped by
medusa-like region
Class Cubozoa
Class Anthozoa
„ Subclass Hexacorallia (Zoantharia)
„ Subclass Ceriantipatharia (鈍膠珊瑚)
„ Subclass Octocorrallia (Alcyonaria)
Fig. 13.2
Fig. 13.3
十字水母
似淡水水母水螅
擬緣膜
裂殖
緣膜
鐘基
1
Fig. 13.4
Fig. 13.5
Fig. 13.6
Fig. 13.7
Class Hydrozoa
Fig. 13.8
Fig. 13.9
2
Fig. 13.10
Fig. 13.11
Fig. 13.12
Fig. 13.13
Fig. 13.14
Fig. 13.15
3
Fig. 13.16
Fig. 13.17
Class Scyphozoa
Fig. 13.18
Fig. 13.19
Fig. 13.20
Class Staurozoa
Class Staurozoa 十字水母
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4
Fig. 13.21
Fig. 13.22
Class Anthozoa
Class
Cubozoa
Fig. 13.23
Fig. 13.24
Fig. 13.25
Fig. 13.26
5
Fig. 13.27
Fig. 13.28
Subclass Hexacorallia (Zoantharia)
Stony Coral
Fig. 13.29
Fig. 13.30
Subclass Ceriantipatharia
Tube anemone & Thorny or black coral
Tube anemone
Fig. 13.31
Fig. 13.32
Thorny or black coral
Subclass Alcyonaria (Octocorallia)
Soft coral
6
Fig. 13.33
Fig. 13.34
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Fig. 13.35
Phylum Ctenophora
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Phylum composed of about 150 species
All marine, most prefer warm waters
Ctenophores
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Fig. 13.36
Eight rows of comb-like plates used for
locomotion
Nearly all free-swimming, few creep or are
sessile
Fig. 13.37
7
Fig. 13.37a
Fig. 13.38
Fig. 13.39
8