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		XA860
Orbiculoidea		p5720
Orbiculoidea		Ich6771
Orbiculoidea		SZ217
Orbiculoidea		JB14
Orbiculoidea		Ich5717
Orbiculoidea		JB4
Orbiculoidea		JB16
Orbiculoidea		JB197
Orbiculoidea		XA907
Orbiculoidea		p1027
Orbiculoidea		p398
Orbiculoidea squamosa	Havlíček a Mergl (1982), Pl. I, fig. 2	MM48
Orbiculoidea squamosa	Havlíček a Mergl (1982), Pl. I, fig. 3	MM47
Orbiculoidea tarda		p33
Orbiculoidea tarda		p2043
Orbiculoidea tarda		p2035
Orbiculoidea tarda		p28
Orbiculoidea tarda		p34
Orbiculoidea tarda		p2053

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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]