Family Dalmanitidae Vogdes

Subfamily Zeliskellinae Delo, 1935

DALMANITINA Reed, 1905. Dalmanitina socialis (Barrande) (x l. 3). Letna beds, U. - M. Ordo vician, Vesela, Bohemia. (Loaned by FMNH.) Assemblage of trilobite parts, remarkably well preserved in quartzite. In addition to Dalmanitina socialis, two cephala of Cryptolithus tesselatus are clearly visible. Due to the high resolution of this photograph, surface details of the carapace as well as the structure of several schizochroal eyes can be identified with the aid of a magnifier.

Prehistoric Exoskeletons

Dalmanitina socialis

(Barrande), U.-M. Ordovician, Letna beds, Drabov bei Beroun, Bohemia (x3.1). A complete individual. (SMNH No. Ar 55081, Coll. Eichbaum, photographed by the author at SMNH, through couttesy of Jan Bergstrom.)

Family Proetidae Salter, 1864

Subfamily Proetinae Salter, 1864

PROETUS Steininger, 1831. Proetus convexus Warburg, U. Ordovician, Kullsberg Limestone, Lake Siljan, Dalarna, Sweden (x4.0). This crystalline limestone is essentially made up of trilobite exoskeletons. (SMNH No. Ar 55076, photographed by the author at SMNH, through couttesy of Jan Bergstrom.)

Subfamily

Cornuproetinae Richter and Richter, 1956

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