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Terrestrial isopods from Spanish amber (Crustacea: Oniscidea) : insights into the Cretaceous soil biota (American Museum novitates, no. 3974)

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dc.contributor.author Sánchez-García, Alba
dc.contributor.author Peñalver, Enrique
dc.contributor.author Martinez-Delclos, Xavier
dc.contributor.author Engel, Michael S.
dc.date.accessioned 2021-08-06T17:48:15Z
dc.date.available 2021-08-06T17:48:15Z
dc.date.issued 2021-08-06
dc.identifier.issn 0003-0082
dc.identifier.uri http://hdl.handle.net/2246/7273
dc.description 32 pages : illustrations (chiefly color) ; 26 cm. en_US
dc.description.abstract Terrestrial isopods (Crustacea: Oniscidea) are a model group for studying the colonization of land. However, their fossil record is remarkably scarce and restricted to amber inclusions, and therefore amber deposits represent valuable windows to their past diversity and morphology. Here we present a new collection of 11 terrestrial isopod specimens preserved in Albian-aged amber from the Peñacerrada I outcrop, northern Spain, which collectively represent the most thoroughly documented fauna of Mesozoic Oniscidea. The three new genera and species identified belong to three of five major groups of the Oniscidea: Eoligiiscus tarraconensis, new genus and species (Ligiidae), Autrigoniscus resinicola, new genus and species (Synocheta: Trichoniscidae), and Heraclitus helenae, new genus and species (Crinocheta: Detonidae?). These taxa significantly expand the known fossil record of Oniscidea and demonstrate that considerable cladogenesis had already transpired by the Albian. The assemblage represents the earliest-known diversification of Oniscidea, extending direct evidence of terrestrialization in the group back to the late Early Cretaceous. These new taxa exhibit some characteristics that may inform hypotheses relating to general patterns of terrestrial isopod evolution. A discussion is provided about different aspects of the paleoecology and biology of the fossils compared to the Recent fauna. The new species indicate that Cretaceous isopods were a group of considerable adaptive diversity, exhibiting innovations analogous to what Recent isopods would exhibit 105 million years later. en_US
dc.language.iso en_US en_US
dc.publisher American Museum of Natural History. en_US
dc.relation.ispartofseries American Museum novitates;no.3974.
dc.subject Isopoda -- Spain. en_US
dc.subject Oniscidae -- Spain. en_US
dc.subject Paleoecology -- Cretaceous. en_US
dc.subject Eoligiiscus tarraconensis. en_US
dc.subject Autrigoniscus resinicola. en_US
dc.subject Heraclitus helenae. en_US
dc.title Terrestrial isopods from Spanish amber (Crustacea: Oniscidea) : insights into the Cretaceous soil biota (American Museum novitates, no. 3974) en_US


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  • American Museum Novitates
    Novitates (Latin for "new acquaintances"), published continuously and numbered consecutively since 1921, are short papers that contain descriptions of new forms and reports in zoology, paleontology, and geology. New numbers are published at irregular intervals.

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