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2 Acta Zoologica Cracoviensia

2 2003

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Fossil insects in Gondwana - localities and palaeodiversity trends

100%

Schluter T.

Acta Zoologica Cracoviensia

2003

tom 46

nr Suppl.

The faunal history of insects in the various fragments of Gondwana is presented. The first part of the paper summarizes the current knowledge of its insect-bearing localities, particularly their stratigraphy and fossil content, emphasizing the record of the higher systematic groups. The second part discusses some trends of their palaeobiodiversity as evidenced from the above mentioned sites. Generally, the knowledge of the fossil Gondwanan insect faunae is still much lower than that of the Laurasian ones, but has considerably increased over the last decade. Altogether about 85 localities are known from Gondwana, with a maximum of sites in Permian and a minimum in Jurassic times. Best represented is South America. Fossil insects of Gondwana are probably less known than those of Laurasia due to inadequate exploration rather than unfavourable conditions for the formation of deposits.

Dragonflies preserved in transparent gypsum crystals from the Messinian [Upper Miocene] of Alba, Northern Italy

51%

Schluter T. , Kohring R. , Gregor H. J.

Acta Zoologica Cracoviensia

2003

tom 46

nr Suppl.

From the Upper Miocene (Messinian) of the Alba area in Piedmont, northern Italy, are fossil dragonflies (mainly larvae) described, which were preserved in transparent gypsum crystals. The specimens belong probably to a single species (Oryctodiplax gypsorum), but occur in various pre-imaginal stages. This individual-rich but species-poor palaeoentomofauna appears to be almost autochthonous in origin and may have developed under hypersalinar conditions in a lagoonal environment during the Messinian salinar event.