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Swiss Journal of Palaeontology
Fig. 14 | Swiss Journal of Palaeontology

Fig. 14

From: The internal morphology of primary spines of extant regular echinoids in the tropical western Atlantic: a SEM atlas

Fig. 14

Echinometra viridis A. Agassiz, USNM E14570, SE micrographs of broken sections through primary spines. a Stub D3, broken end of spine. b Stub D3 (different specimen from a, d), broken end of spine. c Stub D4, broken end of spine. d Stub D3 (different specimen from a, b), broken end of spine. e Stub D4 (different specimen from c), broken end of spine. All scale bars represent 500 μm

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