Pliotoxaster comanchei (Clark) & Heteraster (Enallaster) obliquatus (Clark)
By erose
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Comparative photo of the two Glen Rose heart urchins. These are from the "Salenia texana" marker bed at the top of Unit 2, Lower Member, Glen Rose Formation, Trinity Group (Albian) of Comal County, Texas. Note all five ambulacra are depressed in Pliotoxaster versus only the anterior ambulacra in Heteraster
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2
Photo Information
- Taken with NIKON CORPORATION NIKON D5500
- Focal Length 45 mm
- Exposure Time 1/1000
- f Aperture f/8.0
- ISO Speed 200
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