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JURASSIC AND CRETACEOUS PRIMITIVE CRABS OF THE FAMILY PROSOPIDAE (DECAPODA: BRACHYURA) - THEIR TAXONOMY, ECOLOGY AND BIOGEOGRAPHY Pál MÜLLER (1), Michał KROBICKI (2) & Gabriele WEHNER (3) 1) Geological Institute of Hungary, Földtani Intézet,
Stefánia út. 14; H-1143 Budapest, Hungary; E-mail: mullerp@mafi-2.mafi.hu Müller, P., Krobicki, M. & Wehner, G., 2000. Jurassic and Cretaceous primitive crabs of the family Prosopidae (Decapoda: Brachyura) - their taxonomy, ecology and biogeography. Ann. Soc. Geol. Polon., 70: 49-79. Key words: Decapoda, family Prosopidae, Jurassic, Cretaceous, taxonomy, palaeoecology, palaeobiogeography. |
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| Abstract: The Prosopidae
is an extinct family, consisting mostly of Mesozoic species. Most probably
it accommodates the ancestors of all brachyurans in the large sense. The
family appeared in the Late Pliensbachian and disappeared at the Early Palaeocene. Evolution of the Prosopidae, and therefore, brachyuran evolution started on Middle Jurassic, shallow, soft bottom marine environments. The world-wide Callovian transgression made possible the formation of bioherms and reefs in the Late Jurassic, creating ecological niches for the rapidly differentiating prosopids. These crabs migrated rapidly all over Europe in the Oxfordian and began to flourish and massively occupied sponge megafacies from Portugal to Poland. In the Kimmeridgian, the area of known prosopids shrank, which has probably been connected with decreasing of the reef facies. In turn, a Tithonian regression in the peri-Tethyan area resulted in changes of habitats and in colonisation of the coral reefs. When reef facies retreated at the Jurassic-Cretaceous boundary, the favourable conditions for crab development also vanished, so the known Cretaceous prosopids are rare and spatially dispersed. In Tertiary, the closely related descendants of them, homolodromiids, inhabited preferably soft muddy bottoms in deeper, colder waters. |
Abstrakt: Kraby z rodziny Prosopidae, reprezentowane są prawie
wyłącznie przez gatunki mezozoiczne. Z filogenetycznego punktu widzenia,
są one prawdopodobnie przodkami wszystkich pozostałych gatunków krabów.
Przedstawiciele tej rodziny znani są od późnego pliensbachu do wczesnego
paleocenu. |
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