Cretapsaridae Luque 2021, fam. nov
Creators: name: Luque, Javier
name: Xing, Lida
name: Briggs, Derek E. G.
name: Clark, Elizabeth G.
name: Duque, Alex
name: Hui, Junbo
name: Mai, Huijuan
name: McKellar, Ryan C.
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Decapoda
Cretapsaridae

description: Cretapsaridae Luque, fam. nov. LSID. Family group: http://zoobank.org/urn:lsid:zoobank. org:act:81705335-CAED-400E-B1EC-161B56B298AE. *Corresponding author. Email: jluque@fas.harvard.edu, luque@ualberta.ca (J.L.); xinglida@gmail.com (L.X.) Included genus: <i>Cretapsara</i> Luque, gen. nov., by monotypy. Diagnosis: As for type genus and species. †These authors contributed equally to this work. ‡Present address: Florida International University, Biscayne Bay Campus, 3000 NE Remarks: <i>Cretapsara athanata</i> n. gen. etsp. differsfromanyknown crab family in its combination of plesiomorphic and apomorphic characters. Superficially, itsharessomeresemblancetosomemarineeubrachyuranfamiliessuch as Eogeryonidae, fromthe Upper Cretaceous of Spain [<i>Eogeryon elegius</i>, Cenomanian (<i>14</i>)] (Fig. 5H) and the Lower Cretaceousof Brazil [<i>Romualdocarcinus salesi</i>, Albian (<i>15</i>)], and Marocarcinidae, fromthe Upper Cretaceousof Morocco [<i>Marocarcinus pasinii</i>, Cenomanian (<i>16</i>)] (Fig. 5E). <i>Cretapsara</i> differs from Eogeryonidae and Marocarcinidae in the presenceof a bilobate rostrum and lack of orbital fissures, compared to the bifid and acute rostrum and twowell-developedorbitalfissuresdiagnostic of thesetwofamilies [Marocarcinidae was initially interpretedas havingnoorbitalfissures due to the erroneous interpretation of the eyestalks as part of the orbit (<i>16</i>) but is here recognized as having two orbital fissures and scored as such in our analysis]. The overall carapace outline, the broad front, long legs, and the lack of orbital fissures that characterize <i>C. athanata</i> (Figs. 1 and 2) resemble those of some modern Grapsoidea—a group of highly terrestrial thoracotreme crabscommon in subtidal and supratidal settings worldwide. Despite this, <i>C. athanata</i> differs from grapsoids in important respects. In mostgrapsoids, thereisaconspicuous V-shaped notchbetweenthemerus andischium of thethirdmaxillipeds (mxp3), sothat themandiblesare visible througha large, rhomboidal gapwhen the mxp3 are closed, a featureabsent in <i>Cretapsara</i> (Figs. 2, Cand F, and 3, B, E, and G). Moreover, the podomeres of the walking legs in grapsoids, as in most thoracotreme crabs, are subtriangular to flattened in cross section, whereas those in <i>Cretapsara</i> are circular in cross sectionandmoresimilartothoseofotherheterotremes (Fig.3,movieS1, and data file S1). Such similarities between <i>Cretapsara</i> and some grapsoids are likely convergent adaptations to similar ecologies.
description: Published as part of <i>Luque, Javier, Xing, Lida, Briggs, Derek E. G., Clark, Elizabeth G., Duque, Alex, Hui, Junbo, Mai, Huijuan &amp; McKellar, Ryan C., 2021, Crab in amber reveals an early colonization of nonmarine environments during the Cretaceous, pp. 1-13 in Science Advances 7</i> on pages 1-2, DOI: 10.1126/sciadv.abj5689, http://zenodo.org/record/5598194
description: {"references": ["14. A. Osso, Eogeryon elegius n. gen. and n. sp. (Decapoda: Eubrachyura: Portunoidea), one of the oldest modern crabs from late Cenomanian of the Iberian Peninsula. Bol. Soc. Geol. Mex. 68, 231 - 246 (2016).", "15. L. A. C. Prado, J. Luque, A. M. F. Barreto, A. R. Palmer, New brachyuran crabs from the Aptian - Albian Romualdo Formation, Santana Group of Brazil: Evidence for a Tethyan connection to the Araripe Basin. Acta Palaeontol. Pol. 63, 737 - 750 (2018).", "16. D. Guinot, A. De Angeli, A. Garassino, Marocarcinidae, a new eubrachyuran family, and Marocarcinus pasinii n. gen., n. sp. from the Upper Cretaceous (Cenomanian- Turonian) of Gara Sbaa, southeastern Morocco (Crustacea, Decapoda, Brachyura). Atti Soc. it. Sci. nat. Museo civ. Stor. nat. Milano 149, 25 - 36 (2008)."]}