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RESUMEN ABSTRACT New Report of Fossil Crabs (Decapoda, Brachyura

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RESUMEN ABSTRACT New Report of Fossil Crabs (Decapoda, Brachyura Boletín de la Sociedad Geológica Mexicana / 73 (3) / A120221/ 2021 / 1 New report of fossil crabs (Decapoda, Brachyura) from the late Eocene of San Feliciano Hill (Orgiano, Monti Berici, Vicenza, NE Italy) Nuevo reporte de cangrejos fósiles (Decapoda, Brachyura) del Eoceno tardío en San Feliciano Hill (Orgiano, Monte Bérico, Vicenza, NE Italia) 1 2,* Antonio De Angeli , Alessandro Garassino ABSTRACT 1 Museo Civico G. Zannato, Montecchio Mag- ABSTRACT RESUMEN giore, Vicenza, Italy. 2 Department of Earth and Biological Scienc- The rich decapod assemblage from El rico conjunto de decápodos del Eoceno es, Loma Linda University, Loma Linda, CA the late Eocene of San Feliciano hill tardío del cerro San Feliciano (Orgiano, 92350, USA. (Orgiano, Monti Berici, Vicenza, NE Monte Bérico, Vicenza, NE Italia) fue * Corresponding author: (A. Garassino) Italy) was partially recorded by De registrado parcialmente por De Angeli y [email protected] Angeli and Garassino (2002, 2014). Garassino (2002, 2014). En esta zona hay Herein, two new crabs, Bericirinia dos nuevos cangrejos, Bericirinia bretoni n. bretoni n. gen., n. sp. (Epialtidae gen., n. sp. (Epialtidae MacLeay, 1838) MacLeay, 1838) and Orgianocarcinus y Orgianocarcinus bericus n. gen., n. sp. bericus n. gen., n. sp. (Dairidae Ng and (Dairidae Ng y Rodríguez, 1986) encontra- Rodriguez, 1986) are reported from dos en el cerro San Feliciano, localizado en San Feliciano Hill, located in Monti Orgiano del Monte Bérico. Además estos Berici, Orgiano. Moreover, two dos ejemplares estan bien conservados y well-preserved specimens assigned asignados para Actaeites lobatus Müller to Actaeites lobatus Müller and Collins, y Collins, 1991 (Xanthoidea MacLeay, 1991 (Xanthoidea MacLeay, 1838, 1838, incertae sedis) lo que permitió añadir incertae sedis) allowed to add some algunos caracteres morfológicos a la descrip- morphological characters to the ción original del holotipo donde se carece del original description of the holotype, margen frontoorbitario. lacking the fronto-orbital margin. Palabras clave: Crustacea, Decapoda, Keywords: Crustacea, Decapoda, How to cite this article: Brachyura, Epialtidae, Dairidae, De Angeli, A., Garassino, A., 2021, New Brachyura, Epialtidae, Dairidae, Xanthoidea, taxonomia, Eoceno report of fossil crabs (Decapoda, Brachyura) Xanthoidea, taxonomy, late tardío, Italia. from the late Eocene of San Feliciano Eocene, Italy. (Monti Berici, Vicenza, NE Italy): Boletín de la Sociedad Geológica Mexicana, 73 (3), A120221. http://dx.doi.org/10.18268/ BSGM2021v73n3a120221 Manuscript received: Corrected manuscript received: Manuscript accepted: Peer Reviewing under the responsibility of Universidad Nacional Autónoma de México. This is an open access article under the CC BY-NC-SA license(https://creativecommons.org/licenses/by-nc-sa/4.0/) Fossil crabs (Decapoda, Brachyura) from the late Eocene of San Feliciano, Italy http://dx.doi.org/10.18268/BSGM2021v73n3a120221 2 / Boletín de la Sociedad Geológica Mexicana // 7373 (3)(3) // A120221/A120221 / 2021 2021 1. Introduction and geological setting casts, and decapod crustaceans (De Angeli, 2016; Quaggiotto and De Angeli, 2019). Finally, the San Feliciano hill is located on the southwestern upper part is represented by marly limestones side of Monti Berici between Orgiano and Lonigo including nummulites, bryozoans, bivalves, and (Figure 1). The studied specimens are preserved INTRODUCTION AND GEOLOGICAL SETTING / MATERIAL echinoderms. Many decapod crustaceans col- within the limestones including coralline algae lected within the calcarenites were described by and corals from the late Eocene (Priabonian), several authors (Fabiani, 1911; De Angeli and located in San Feliciano hill (Orgiano, Monti Garassino, 2002, 2014, in press; De Angeli and Berici, Vicenza, NE Italy) (Figure 2). The strati- Lovato, 2009; De Angeli et al., 2010a; De Angeli, graphic unit is the so-called “Formazione di 2016). The studied specimens, subject of this note, Priabona” (late Eocene, Priabonian). The micro- were collected from this calcarenite level of the fossil analysis by nannofossils provided by Beccaro quarry. (2003) confirmed the Priabonian age for all layers present in the quarry. The lowest layers are repre- 2. Material sented by a well-stratified greyish marly-limestone formation including many algae, nummulites, The material includes 10 specimens, housed in the bivalves, several echinoderms, and rare decapod Museo Civico “Domenico Dal Lago” of Valdagno crustaceans [Palaeocarpilius macrocheilus (Desmarest, (Vicenza, NE Italy) (MCV). The sizes are expressed 1822)]. White-yellowish calcarenites, 6-7 meters in millimetres. Anatomical abbreviations – lcxp: thick, overlap the lower layers. These calcarenites carapace length; wcxp: carapace width; wof: orbi- including coralline algae, corals, rare mollusc tofrontal margin width; wf: frontal width. Figure 1 Map of Monti Berici with location (*) of San Feliciano hill (Orgiano, Monti Berici, Vicenza, NE Italy). Fossil crabs (Decapoda, Brachyura) from the late Eocene of San Feliciano, Italy http://dx.doi.org/10.18268/BSGM2021v73n3a120221 Boletín de la Sociedad Geológica Mexicana / 73 (3) / A120221/ 2021 / 3 SYSTEMATIC PALEONTOLOGY Figure 2 Close-up of the limestones including coralligenous algae and corals from the late Eocene (Priabonian) of San Feliciano hill. 3. Systematic paleontology the main morphological characters shared with many spider crabs, such as the triangular cara- Order Decapoda Latreille, 1802 pace, larger posteriorly; narrow frontal margin; Infraorder Brachyura Latreille, 1802 and orbits laterally directed. Moreover, the short, Section Eubrachyura de Saint Laurent, 1980 bifid rostrum and the lacking of the intercalated Subsection Heterotremata Guinot, 1977 spine allow to assign the new genus to the Epi- Superfamily Majoidea Samouelle, 1819 altidae MacLeay, 1838. Schweitzer et al. (2020) Family Epialtidae MacLeay, 1838 provided a new classification of the Majoidea and Subfamily Epialtinae MacLeay, 1838 within the Epialtidae which includes five fossil Genus Bericirinia n. gen. genera (Epialtus H. Milne Edwards,1834; Bolcapisa Beschin, Busulini and Tessier in Beschin et al., Diagnosis: Triangular carapace, larger posteri- 2016; Eoinachoides Van Straelen, 1933; Nanomaja orly, considerably wider than long, convex longitu- Müller and Collins, 1991; Panticarcinus Collins dinally; wide front; short, bifid rostrum, separated and Saward, 2006) and one extant-fossil genus by U-shaped notch; preorbital angle blunt; orbits (Pugettia Dana, 1851), Panticarcinus from the early laterally directed; intercalated spine not present; Eocene (Ypresian) of UK is the only genus which divergent, smooth anterolateral margins; short shows affinities withBericirinia n. gen. Indeed, both posterolateral margins, strongly convergent; dor- genera share the triangular carapace, larger pos- sal regions slightly raised and marked by weak teriorly; oblique, divergent anterolateral margins; grooves; frontal region with an axial depression and dorsal regions with swellings and tubercles. running between epigastric lobes and protogastric Panticarcinus, however, differs from the new genus regions; gastric, cardiac, and branchial regions in having the carapace longer than wider and with some tubercles and ovate swellings; dorsal elongate single rostrum. surface with a scabrous-shaped small granules. Etymology: from Monti Berici where the studied Bericirinia bretoni n. gen., n. sp. specimen was collected. Gender: feminine. Figure 3 Type species: Bericirinia bretoni n. gen., n. sp., by monotypy. Diagnosis: as for the genus. Discussion: Based upon Davie et al. (2015) and Etymology: the species is named in honour of Schweitzer et al. (2020), Bericirinia n. gen. shows Gérard Breton (1944-2020), in recognition of Fossil crabs (Decapoda, Brachyura) from the late Eocene of San Feliciano, Italy http://dx.doi.org/10.18268/BSGM2021v73n3a120221 4 / Boletín de la Sociedad Geológica Mexicana // 7373 (3)(3) // A120221/A120221 / 2021 2021 his major contributions to the knowledge of the preorbital angle blunt; orbits laterally directed; palaentology and invertebrate fossils. divergent, elongate, and smooth anterolateral Holotype: MCV.2021/003-I.G.21.23, by margins; short posterolateral margins, strongly monotypy. convergent; relatively wide posterior margin, SYSTEMATIC PALEONTOLOGY Type locality: San Feliciano hill (Orgiano, Monti partially preserved; dorsal regions slightly raised Berici, Vicenza, NE Italy). and marked by shallow grooves; frontal region Geological age: late Eocene (Priabonian). depressed axially; frontal axial depression run- Material and measurements: one carapace ning along epigastric and protogastric regions; in dorsal view (MCV.2021/003-I.G.21.23 – lcxp: epigastric lobes with two ovate swellings; raised 32.8 mm, wcxp: 34.2 mm, wof: 18 mm). protogastric regions with three swellings; relatively Description: Triangular carapace, convex lon- raised metagastric regions with two swellings; nar- gitudinally, larger posteriorly, slightly wider than row, depressed urogastric region; cardiac region long (lcxp/wcxp = 0.95), widest between angles well marked by branchiocardiac grooves later- of antero- and posterolateral margins; wide front; ally, with two swellings; branchial region marked short, bifid rostrum, separated by U-shaped notch; anteriorly by cervical groove with one strong epi- Figure 3 Bericirinia bretoni n. gen., n. sp., holotype, MCV.21/003-I.G.21.23; 1. dorsal view; 2. dorsal digital reconstruction; 3. lateral
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