MYRICK ET AL.: DENTAL LAYERS IN HAWAIIAN SPINNER DOLPHINS 



B 



H 



h 

 200pm 



1974 



I I i I l l l l 



Treatments 



Labels 



1975 



1976 1977 



I I I I i I I n I ii i I 



1979 1980 



l 1 1 I I I ii l 1 1 i I I i i 



A^B C 

 No record 



E F ^G H 



No record 



FIGURE 5.— Labeled tooth of dolphin carcass WFP 671. A. Untreated thin section in UV light showing TCL labels 

 (39X). B. Thin section in plain light showing almost eight complete GLGs as interpreted from labels. Light GLG boun- 

 dary layers appear to have been deposited in or about March (39X). C. Chart showing match between labels and treat- 

 ments. 



TABLE 1. — Mean age-specific thicknesses (fim) of completed dentinal growth layer groups (GLGs) in 

 teeth of seven Hawaiian spinner dolphins, Stenella longirostris. Values are averages of at least three 

 measurements per specimen, taken perpendicular to the long axis of the tooth in a stairstep fashion 

 downward and inward from the base of the neonatal line to the pulp-cavity wall. 



Specimen GLG number 



no 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 



WFP 670 240 240 180 — — — — — — — — — — — — 



WFP669 1 240 240 172 5 150 1275 1275 92.5 85 65 57.5 — — — — — 



WFP 671 240 240 165 140 120 95 80 ______ __ 



ACM 104 240 230 170 140 130 90 90 70 70 60 55 — — — — 



ACM 103 240 240 180 160 110 80 80 70 60 60 60 65 55 40 40 



ACM 106 240 240 1 50 1 30 1 1 90 90 60 60 60 55 — — — — 



WFP 606 240 240 1 80 1 50 1 20 90 90 — — — — — — — — 



/V 7776666444311 11 



* — 2386 1710 1450 1196 95 4 87 713 613 58 1 55 — — — — 



SD 3.8 110 10 5 8 4 16 5 5 6 10 3 2 5 2.4 5.0 — — — — 



SE 1.4 4 2 4 3 34 6 7 2.3 5.2 1.3 12 2.9 — — — — 



'Mean values ol measurements in untreated and D/S (decalcified and haematoxylin-stained) sections 



215 



