Stylocidaris ryukyuensis
Shigei, 1975
琉球柄頭帕
Size:27.15mm
Family:Cidaridae頭帕海膽科
Locality:Southern Taiwan Strait
Prionocidaris hawaiiensis 27.15mm aboral view.
Prionocidaris hawaiiensis 27.15mm aboral view. Close-up.
Prionocidaris hawaiiensis 27.15mm oral view.
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Prionocidaris hawaiiensis 27.15mm oral view. Close-up.
Prionocidaris hawaiiensis 27.15mm lateral view.
Prionocidaris hawaiiensis 27.15mm lateral view. Close-up.
Prionocidaris hawaiiensis 27.15mm primary spine.
3 different type of primary spine showed on aboral side.
The inner layer of primary spine around apical system.
The secondary layer of primary spine.
The third layer of primary spine.
6 different type of primary spine on oral side.
The third layer of primary spine.
Crossectional view of primary spine.
The red circle indicate the oral side is flat.