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Fig. 4 | BMC Evolutionary Biology

Fig. 4

From: Morphology and evolutionary significance of phosphatic otoliths within the inner ears of cartilaginous fishes (Chondrichthyes)

Fig. 4

FTIR-ATR spectra of samples in comparison to reference material. Spectra have been vertically offset for better visibility. The region at 2400–1850 cm− 1 has been skipped due to numerous artefacts from CO2 and ATR-crystal defects. ACA, aragonite; AR1, A. radiata (IPUW 7858) sagitta; AR2, A. radiata (IPUW 7859) sagitta; AR3, A. radiata (IPUW 7859) asteriscus; COA, CO3-bearing apatite; COL, shark collagen; DEN, shark dentine + enamel; HAP, hydroxylapatite; PL1, P. leopoldi (IPUW 7358) lapillus; PL2, P. leopoldi (IPUW 7358) asteriscus; SC1, S. canicula (EMRG-Chond-A-1) sagitta, SC2, S. canicula (EMRG-Chond-A-1) lapillus

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