Abstract

Based on ecofaunistical indices (dominance, similarity indices:Jaccard-, Sorensen-, Renkonen-Index) Sciaridae and Ceratopogonidae of Baltic amber and Saxonian amber from Bitterfeld are compared. Despite of the age difference of the amber-bearing deposits of 13–18 Mio. years the included sciarids have a species identity of 34.2% (Jaccard-Index) and a dominance identity of 49.5% (Renkonen-Index). Because of the less carefully studied material from Saxonian amber the ceratopogonids have a species identity of only 9.5 % (Jaccard-Index) (Szadziewski 1993); remarkable is the dominance identity of 37 % (Renkonen-Index). Compared with the data from recent faunas the high degree of identity is the result of a pronounced similarity of the nematoceran faunas of Baltic and Saxonian amber.

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