Phylum: Echinodermata 棘皮動物門
Class: Echinoidea 海膽綱
Family: Arachnoididae 蛛網海膽科
Scientific name: Arachnoides placenta
Chinese name: 扁平蛛網海膽
Author: Linnaeus, 1758
Size: 61x8mm
Description: Sea Urchin, 60mm, taken in Olango Island, Cebu, Philippines.
Arachnoides placenta, 扁平蛛網海膽, Aboral view(反口面).
Arachnoides placenta, 扁平蛛網海膽, Apical system (頂系)
Arachnoides placenta, 扁平蛛網海膽, Oral view(口面).
Arachnoides placenta, 扁平蛛網海膽, Lt. lateral view(左側面).
Arachnoides placenta, 扁平蛛網海膽, Posterior view(後端).
Arachnoides placenta, 扁平蛛網海膽, Periproct (肛圍)
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