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Swiss Journal of Palaeontology
Fig. 5 | Swiss Journal of Palaeontology

Fig. 5

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

Fig. 5

Diadema antillarum (Philippi), USNM 33219, SE micrographs of broken sections through primary spines. a, b Stub B3, both ends of broken spine. c Stub B1. d Stub B2. e Stub B1, broken distal end (different specimen from c). f Stub B2 (different specimen from d). g Stub B3 (different specimen from a, b). Scale bars a, b, d, f represent 1 mm, c, e, g represent 500 µm

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