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pedicle, when present, takes up a portion of the delthyrium. Despite their ubiquity, the delthyrium and notothyrium are not always fully visible. Many...

to open and close. There is usually a functional pedicle although the delthyrium may be partially closed. Morphologically, the rhynchonellid has changed...

typical of the superfamily Orthoidea, including: a strophic hinge, open delthyrium and notothyrium, simple and ridgelike cardinal process, quadripartite...

diamond-shaped profile. The pseudodeltidium is voluminous, covering most of the delthyrium (ventral indentation) and taking up a large portion of the ventral valve...

diductor muscles, projecting through the posterior opening known as the delthyrium, would have used the cardinal process as a sort of lever when lifting...

An oblique view, showing the dorsal valve and the interarea with the delthyrium A lateral view, dorsal valve on the bottom, ventral valce on the top Syringothyris...

excavation or furrow, known as a notothyrium (in the dorsal valve) or a delthyrium (in the ventral valve). Finally, these furrows may be partially covered...

structures delicate. No pedicle collar observed in two sectioned specimens. Delthyrium wide, trapezoidal; lateral cavities narrow; dental plates long, beyond...

cavities of both valves. No pedicle collar observed in sectioned specimens; delthyrium wide, trapezoidal to rectangular in shape; lateral cavities narrow and...

with of the shell), almost entirely situated in the backfolding part (or delthyrium) of the pedicle valve (submesothyridid to almost hypothyridid), leaving...