. Brachiopod genera of the suborders Orthoidea and Pentameroidea. Orthoidea; Pentameroidea; Paleontology -- Paleozoic. GENERA OF THE SUBORDER ORTHOIDEA 107 Superfamily CLITAMBONACEA Schuchert 1929, emended Specializing and terminal Orthoidca probably devel- oped out of the Billingsellidx and retaining as a rule the primitive features of deltidia and chilidia, here much enlarged, and developing either pseudospondylia (more rarely) or spondylia simplex. Test impunctate. deltidia and cardinalia as in Vellamo and Clitambomtes, but without spondylia and with discrete chilidial plates that may be re
. Brachiopod genera of the suborders Orthoidea and Pentameroidea. Orthoidea; Pentameroidea; Paleontology -- Paleozoic. GENERA OF THE SUBORDER ORTHOIDEA 107 Superfamily CLITAMBONACEA Schuchert 1929, emended Specializing and terminal Orthoidca probably devel- oped out of the Billingsellidx and retaining as a rule the primitive features of deltidia and chilidia, here much enlarged, and developing either pseudospondylia (more rarely) or spondylia simplex. Test impunctate. deltidia and cardinalia as in Vellamo and Clitambomtes, but without spondylia and with discrete chilidial plates that may be remnants of chilidia. This small family of two genera is restricted to the Lower Ordovician (upper Canadian) of the United Tables Of European origin and later dispersion to North America Clitambonitin^ Vellamo DELTATRETIDiE Polytoechia Deltatreta Pomatotrema. » Estlandia Hemipronites BiLLINGSELLIDiE Ingria Range, throughout the Ordovician and rarely in the Silurian. The phylogeny of this small superfamily is believed to be as shown in Table 8. Family DELTATRETID^E Schuchert and Cooper 1931 Primitive Clitambonacea that probably originated in the Largely orthoid in expression, with States and Canada. It forms a morphologic connec- tion between the orthids on the one hand and the large family Clitambonitida on the other. It includes the two genera Deltatreta Ulrich and Pomatotrema Ulrich and Cooper. Internally the dorsal valves are like those of Vellamo and Clitambonites, but there are chilidial plates instead of a chilidium. In the ventral valve there is no spon- dylium, but in old shells of both genera there may be a pseudospondylium. The deltidium of both genera is exactly like that of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Schuchert, Charles, 1858-1942; Cooper
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