Stylocidaris ryukyuensis 27.15mm 琉球柄頭帕

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.