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Swiss Journal of Palaeontology
Fig. 8 | Swiss Journal of Palaeontology

Fig. 8

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

Fig. 8

Arbacia punctulata (Lamarck), USNM E15003, SE micrographs of broken sections through primary spines. a Stub B10, broken end of spine. b Stub B10 (different specimen from a, d), broken end of spine. c Stub B11, broken tip of spine. d Stub B10, broken end of spine (different specimen from a, b). e Stub B12, broken section of spine. f Stub B12 (different specimen from e), broken section of spine. All scale bars represent 500 μm

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