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Armadillidium sp. from the upper Oligocene of Eger, Hungary (MM 2015.513.1). 1. Lateral (right) view. 2. Dorsal view. 3. Lateral (left) view. 4. Anterior view; note the missing cephalon. 5. Postero-dorsal view. 6. Posterior view. Roman numerals indicate pereonites; Arabic numerals refer to pleonites.  

Armadillidium sp. from the upper Oligocene of Eger, Hungary (MM 2015.513.1). 1. Lateral (right) view. 2. Dorsal view. 3. Lateral (left) view. 4. Anterior view; note the missing cephalon. 5. Postero-dorsal view. 6. Posterior view. Roman numerals indicate pereonites; Arabic numerals refer to pleonites.  

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... One major obstacle is that the fossil record of the Oniscidea is poor despite a likely Late Paleozoic origin (reviewed in Broly et al., 2013Broly et al., , 2015. One possible explanation is that isopods are difficult to fossilize in continental realms except under exceptional conditions (see Hyžný and Dávid, 2017). Yet numerous amber inclusions of Oniscidea have been recorded but, at the exception of some studies (e.g., Morris, 1979;Schmalfuss, 1980Schmalfuss, , 1984, they have only been superficially examined and figured. ...
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Currently, the Onisicdea (terrestrial isopods) is a massive Crustacea suborder of more than 3 700 species, but our knowledge of their paleodiversity is poor. In this paper, we present ten fossils of Crinocheta, the largest clade within the Onisicdea, discovered in Early Miocene (23 Ma) amber of Chiapas. We described three new genera and six new species including Palaeolibrinus spinicornis gen. nov. sp. nov., Armadilloniscus miocaenicus sp. nov., Archeostenoniscus robustus gen. nov. sp. nov., Archeostenoniscus mexicanus sp. nov., Palaeospherarmadillo mazanticus gen. nov. sp. nov., and Palaeospherarmadillo rotundus sp. nov. This study represents the first fossil record of the family Detonidae, Olibrinidae, and “Stenoniscidae”. From a paleoenvironmental reconstruction perspective, the oniscidean fauna presented here supports a particularly wet paleoenvironment, under brackish water influence, similar to an estuary.
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