Leptostyrax macrorhiza (Cope, 1875)

Remarks

• Here are some teeth (1–5) from Lee Duchouquette's collection.  Strat and locale information:  Upper Washita Group, Weno Formation, Tarrant County, Texas.

General Info

Synonyms (older names and misidentifications in the literature)

• Another member of the Mackerel Shark family
• 1875 Lamna macrorhiza Cope
• 1987 Leptostyrax macrorhiza (Cope); Cappetta
• 1989 Leptostyrax macrorhiza Pictet and Campiche (sic ?); Finsley
• 1993 Leptostyrax macrorhiza (Cope); Welton and Farish

Stratigraphic Occurrence

• Woodbine Group, Lewisville Formation of North Texas
• Woodbine Group, Pepper Formation of Central Texas
• Uppermost Washita Group, Del Rio Formation of Central Texas
• Uppermost Washita Group, Grayson Formation of North Texas
• Upper Washita Group, Pawpaw Formation of North Texas
• Upper Washita Group, Weno Formation of North Texas
• Lower Washita Group, Duck Creek Formation of North Texas

Age

• Leptostyrax macrorhiza (Cope) occurs at from about the Mortoniceras equidistans (Cragin) zone to the Mariella (Wintonia) brazoensis (Roemer) zone, lower Upper Albian to Lowermost Cenomanian Stage (~101 to 97 mya).

Geographic Occurrence (not an all-inclusive list)

• Dallas County, TX
• Grayson County, TX
• Tarrant County, TX
• Johnson County, TX

Remarks

         For identification and descriptions, see:

• Welton, B. J; Farish, R. F.  1993.  The  Collector’s  Guide  to  Fossil  Sharks  and  Rays  from  the  Cretaceous  of  Texas.  Lewisville:  Before Time.