Steve Cunningham, Baltimore, MD
Striatolamia macrota Agassiz, 1843
Two possible subsets

Tooth Count
The first upper anterior count is shown under the graph.
 Note: the UA1 position is very consistent in appearance and could not be reliably differentiated to subset "a" or "b." However, it's position on the graph and characters ally it with subset "b."

Subset a
__________

Upper teeth

UA2 left 233
UA2 right 230
463

UA3 left 213
UA3 right 215
428

ULat left 918
ULat right 862
1780

Total upper  2671
________

Lower teeth

LA1 (symphyseal) n/a

LA2 left 267
LA2 right 289
556

LA3 left 310
LA3 right 302
612

LA4 left 225
LA4 right 264
489

LLat left 698
LLat right 639
1337

Total lower 2994
__________

Total upper & lower
(Not including UA1) 5665

Subset b
__________

Upper teeth

UA2 left 144
UA2 right 157
301

UA3 left 134
UA3 right 127
261

ULat left 533
ULat right 494
1027

Total upper 1589
_______

Lower teeth

LA1 (symphyseal) n/a

LA2 left 139
LA2 right 149
288

LA3 left 169
LA3 right 179
348

LA4 left 160
LA4 right 167
327

LLat left 378
LLat right 368
746

Total lower 1709
__________

Total upper & lower
(Not including UA1) 3298

 Graph
UA1 left 147
UA1 right 140
287
Total tooth count
(Including UA1) 9250

 Sorting methods

1. All teeth from Mike Folmer's collection were separated from the clay and other material of a single horizon.

2. Several pounds of shark teeth were sorted to species.

3. Above process was repeated by laying teeth out oriented in the same manner and comparing characters.

4. S. macrota was isolated and sorted to upper and lower teeth.

5. Upper and lower teeth of S. macrota sorted to position.

6. Each position was sorted to subset a and subset b.

7. The above process was repeated by laying the teeth out in an ontological series. Lateral teeth were grouped according to distal slant and height of blade relative to width.

8. All positions for subset a and subset b were sorted to right and left sides.

9. Teeth on the right and left sides, for every position, were counted and graphed.