Linguliformea (Linguliforms)

Linguliformea is a subphylum of former inarticulate brachiopods. These were the earliest of brachiopods, ranging from the Cambrian into the Holocene. They rapidly diversified during the Cambrian into the Ordovician, but most families went extinct by the end of the Devonian.The articulation in these brachiopods is lacking. These brachiopods have adductor and oblique muscles, but no diductor muscles. The anus is located at the side of the body. The pedicle is a hollow extension of the ventral body wall. Posterior body wall separates dorsal and ventral mantles. The shells are usually made up of apatite (calcium phosphate), however rare cases have calcite or aragonite shells.

Source: http://en.wikipedia.org/wiki/Linguliformea

Orbiculoidea depressa		p1188
Orbiculoidea intermedia		JB204
Orbiculoidea intermedia		p5725
Orbiculoidea intermedia		JK18060
Orbiculoidea intermedia		p5727
Orbiculoidea intermedia		p1087
Orbiculoidea intermedia		p5706
Orbiculoidea missouriensis		p4616
Orbiculoidea propinqua		p502
Orbiculoidea rugata		p1109
Orbiculoidea signata		p1140
Orbiculoidea signata		p1085
Orbiculoidea signata		JB210
Orbiculoidea signata		p6170
Orbiculoidea sodalis		p3733
Orbiculoidea		XA861
Orbiculoidea		Ich5705
Orbiculoidea	AD, Kříž a kol. (1986)	JK7725
Orbiculoidea	AD, Kříž a kol. (1986)	JK7726
Orbiculoidea	AD, Kříž a kol. (1986)	JK7727

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Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]