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Swiss Journal of Palaeontology
Fig. 12 | Swiss Journal of Palaeontology

Fig. 12

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

Fig. 12

Tripneustes ventricosus (Lamarck), USNM E27033, SE micrographs of broken sections through primary spines. a Stub C10, broken distal part of large spine. b Stub C10 (different specimen from a, c), broken proximal end of small spine. c Stub C10 (different specimen from a, b), broken distal end of spine. d Stub C12, oblique view of broken end of small spine. e Stub C12 (different specimen from d), oblique view of broken surface of large spine. All scale bars represent 500 μm

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