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Four decapod crustacean species from the Middle Miocene Mishan Formation of Hormozgan Province, Southern Iran are described.

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Gigantic representatives of the clymeniid genera Hoevelia and Protactoclymenia (Late Devonian ammonoids) with conch sizes up to 50 cm occur in small numbers in shallow-water carbonates at Chahriseh (Central Iran). Comparison with other occurrences of gigantic clymeniids (Central Europe, North Africa) suggests that taphonomic reasons rather than latitudinal effects with differences in sea water temperature and oxygen availability are responsible for this gigantism. The large size of the ammonoids at Chahriseh is interpreted as local phenomenon caused by accumulation of post-mortem drifted specimens. The new species Hoevelia megalomanica is described.

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