Platyhelminthes
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第六章 扁形动物门 (Platyhelminthes) PowerPoint PPT Presentation


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身体背腹扁平,故称 扁形动物 。 约 20000 多种,包括 涡虫 、 吸虫 和 绦虫 。 动物进化史上的一次飞跃。. 第六章 扁形动物门 (Platyhelminthes). 一、两侧对称 (bilateral symmetry): 从本门动物开始,身体获得了两侧对称。 意义: 使动物有了背腹、前后之分,背面起保护作用,腹面负责运动和摄食。. 促使神经系统和感觉器官向前集中,运动由不定向变成了定向。 左右对称的身体,使动物既适于水中游泳,又适于水底爬行,从而为动物过渡到陆地上爬行打下了基础。 使动物能够主动寻找食物、躲避敌害,对外界环境的反应也更迅速、准确。.

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第六章 扁形动物门 (Platyhelminthes)

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20000

(Platyhelminthes)


(bilateral symmetry):


(mesoderm):


(protonephridium)



(oviduct)(vas deferens)


3

(Turbellaria):

5 mm50 cm

4


() (Acoela):

2 mm

() (Rhabdocoelida):


() (Tricladida):

312

() (Polycladida):


(Dugesia): 2cm

11/3


2


()


3

3


4


5


2

6


7




3000

(Trematoda):


1

2

3

4

5

6

723


()

1025 mm1/5

1/3 2

(Clomorchis sinensis):


1


2


3


5

4


(1)

1

(2)

6



()



1(Monogenea):

()

3


2(Aspidogastrea):

() 12


3(Digenea):

2


(Cestoidea)



1

2

3

4


1(Taenia solium):

42-8

:



2(Taeniarhynchus saginatus):

5124




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