Specimen:       Extremely RARE Paleozoic, Carboniferous armored spider Trigonotarbid abdomen !
 Locality:         Poland, GZW Upper Silesia Coal Basin – Detailed data will be send with specimen 
 Stratigraphy:  Upper Carboniferous, Middle Pennsylvanian, Westphalian B, orzeskie beds
 Age:                 ca. 310 - 314 Mya

Nodule dimensions: 9,5 x 6,0 x 1,0 cm, Spider is 0,3 cm  ( White square on pictures is 1,0 x 1,0cm )

Description:

Extremely rare Upper Carboniferous / Pennsylvanian spider like arachnid - trigonotarbid - abdomen fossil. 
Trigonotarbids were spider-like arachnids, but without silk-producing spinnerets. 
They ranged in size from a few millimetres to a few centimetres in body length and had segmented abdomens, 
with the tergites across the backs of the animals' abdomens, which were characteristically divided into 
three or five separate plates. Probably living as predators on other arthropods, some later trigonotarbid 
species were quite heavily armoured and protected themselves with spines and tubercles. 
About seventy species are currently known.