- Diagram of a simple form of Crinoid, with five arms, each forking once; the one nearest the observer is removed to expose the tegmen of five orals. [Please select]
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The delicate, spindle-shaped columellae lie ventral to the tegmen tympani and squamosals, are spatulate distally, and have a broad basal attachment to the auditory region. [Please select]
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The tegmen tympani are much reduced and maintain only cartilaginous contact with the posterior arms of the squamosals. [Please select]
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Tegmen: a covering: sometimes used for the anterior wings in Orthoptera and Neuroptera. [Please select]
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The auditory regions are relatively massive and bear narrow tegmen tympani; the distal ends of the tegmen tympani are medial to the lateral edge of the pterygoids in dorsal view. [Please select]
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