Conchopeltis alternata Walcott, 1876 - Description from Oliver, 1984

Conchopeltis alternata Walcott, 1875, p. 93; Walcott, 1879, p. 93; Miller, 1889, p. 400; Ulrich and Scofield, 1897, p. 823, fig. 2; Knight, 1937, p. 186, pl. 29, fig. 1-5; Glaessner, 1971, p. 9; Oliver, 1984, p. 141, pl. 1, fig. 1-7.

Description: Has low pyramidal form and a very thin test of unknown composition. In most specimens four lobes give a “square” outline and may suggest at first glance a fourfold radial symmetry. The lobes are separated by grooves that radiate from the apex, and each lobe is divided into two equal parts by shallower grooves. In addition, the surface bears fine radiating striae ad concentric growth lines. Specimens are 5 to 6 cm in diameter and 1 to 1.6 cm high, they are very low pyramids. In a specimen from the New York State Museum what appear to be tentacles are found extending away from the margin. With this evidence and the presence of bilateral symmetry Oliver (1984) believes Conchopeltis to be a medusoid that is possibly of cnidarian (corals, anemones, jellyfish, etc.) descent.


Showing part and counter-part of Conchopeltis alternata, MCZ 107280   Conchopeltis alternata, MCZ 107281   Conchopeltis alternata, MCZ 102969
MCZ 107280: Holotype, 57mm wide
MCZ 107281: Paratype, 105mm wide
MCZ 102969: 46mm wide
Conchopeltis alternata, MCZ 102970 Conchopeltis alternata, MCZ 107282 Conchopeltis alternata, MCZ 107283
MCZ 102970: 26mm long
MCZ 107282: Unfigured Paratype, 48mm wide
MCZ 107283: Unfigured Paratype, 47.5mm wide
Conchopeltis alternata, MCZ 107284 Conchopeltis alternata, MCZ 107285 Conchopeltis alternata, MCZ 107286
MCZ 107284: Paratype, 53.5mm wide
MCZ 107285: Unfigured Paratype, 37mm long
MCZ 107286: Paratype, 74mm long
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