The Echinoid Directory

• Home
• Introduction
• Morphology
• Keys
• Classification
• 3D models
• Index to taxa
• Glossary
• Log in

Plagiochasma texanum Smith & Rader, 2009, p. 44

Diagnostic Features	A species of Plagiochasma with a relatively large persitome, pore-pairs only slightly offset into weak triads adorally, and with the anterior ambulacrum remaining flush around the ambitus and subambitally.  periproct supra-ambital with the upper edge opening between the two posterior petals and the lower edge within a short but distinct anal sulcus.
Distribution	Lower Albian, Texas, USA
Type	Holotype, BMNH EE13490, paratypes BMNH EE13491-93
Classification and/or Status	A species of Plagiochasma
Remarks	Smith, A. B. & Rader, W. L. 2009. Echinoid diversity, preservation potential and sequence stratigraphical cycles in the Glen Rose Formation (early Albian, Early Cretaceous), Teas, USA. Palaeobiodiversity and Palaeoenvironments 89, 7-52.