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Fig. 13 | Zoological Letters

Fig. 13

From: Growth and mineralogy in dental plates of the holocephalan Harriotta raleighana (Chondrichthyes): novel dentine and conserved patterning combine to create a unique chondrichthyan dentition

Fig. 13

Harriotta raleighana (Rhinochimeridae; Holocephali; Chondrichthyes). Calcium (Ca) profiles relative to hydroxyapatite standard, on virtual sections in μCT, juvenile lower plate microanatomy. Density profiles measured in Humboldt units (HU), blue graphs (f, h). Labial is to the right in all these μCT images. a dental plate rendered showing worn oral surface with hypermineralized dentine (HD) of ovoids and a lingual tritor projecting, these of a different shape to the adult (Figs. 1, 16, 17). b, c, virtual sections through A, labial ovoids (ov) and lingual tritor (tri) with C close up of B, show preformed shape of all HD in the trabecular dentine (td) of the aboral regions (ov.s). d virtual horizontal section through tritor and unmineralized rod (white arrows), showing same aboral-oral mineralization as in ovoids and tritors. e, g virtual sections through dental plate, density measured along red line from oral to aboral. f, h profiles of ovoids in E, tritor in F with same HU values for the most dense HD at the oral surface and lower values for the trabecular dentine between these, with little difference to those recorded for the adult plates (Fig. 12a, b, c and d)

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Zoological Letters

ISSN: 2056-306X

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