Atti Soc. it. Sci. nat. Museo civ. Stor. nat. Milano, 149 (I): 9-16, Gennaio 2008 Alessandro Garassino' & Antonio De Angeli" Ranilia constricta (A. Milne Edwards, 1880) (Brachyura, Raninidae) from thè Tyrrhenian (Upper Pleistocene) of Bovetto (Calabria, S Italy) Abstract - We report three specimens, discovered in thè upper Pleistocene (Tyrrhenian) of Bovetto quarry, located dose to Reggio Calabria (Calabria, S Italy). The study of these well-preserved three-dimensional specimens allowed assigning them to thè Recent species Ranilia constricta (A. Milne Edwards, 1880) (Raninidae De Haan, 1839, Notopodinae Seréne & Umali, 1972), widespread in Western Atlantic (Florida Straits and Yucatan Channel, Cuba, off Barbados, and Brazil), Central Atlantic (Ascension Island), and Eastem Atlantic (from Senegai to Congo). It is thè first report of this species in thè fossil record and in thè Mediterranean area. Key words: Crustacea, Decapoda. Brachyura, Pleistocene, Italy. Riassunto - Ranilia constricta (A. Milne Edwards, 1880) (Brachyura, Raninidae) del Tirreniano (Pleistocene superiore) di Bovetto (Reggio Calabria, S Italia). Descriviamo tre esemplari, rinvenuti nel Pleistocene superiore (Tirreniano) del giacimento di Bovetto, ubicato vicino a Reggio Calabria (Calabria, S Italia). Lo studio di questi esemplari tridimen¬ sionali e ben conservati ha permesso la loro attribuzione alla specie vivente Ranilia constricta (A. Milne Edwards, 1880) (Raninidae De Haan, 1839, Notopodinae Seréne & Umali, 1972), diffusa nel¬ l’Atlantico occidentale (Florida, Canale dello Yucatan, Cuba, Barbados e Brasile), Atlantico Centrale (Isola dell’Ascensione), e Atlantico orientale (dal Senegai al Congo). Si tratta della prima segnalazione di questa specie nel record fossile e nell’area Mediterranea. Parole chiave: Crustacea, Decapoda, Brachyura, Pleistocene, Italia. Introduction The studied specimens were collected in Bovetto quarry, located N of Reggio Calabria (Calabria, S Italy), known for its interesting marine fauna since thè second half of Nineteenth Century. The Bovetto series, 45 m thick, preserves a rich mala- cological fauna characteristic of a warm climate with many specimens of Strombus bubonius Lamarck, typical gastropod from thè Tyrrhenian (upper Pleistocene) of * Museo di Storia Naturale, Corso Venezia, 55, 20121 Milano, Italy, e-mail: [email protected] ** Associazione Amici del Museo “G. Zannato”, Piazza Marconi 15, 36075 Montecchio Maggiore (Vicenza), Italy, e-mail: [email protected] 10 ALESSANDRO GARASSINO & ANTONIO DE ANGELI Mediterranean area. Rare fossil mammals, such as Dama dama cfr. D. tiberina and Hippopotamus cfr. H. amphibius, were discovered in thè Bovetto series. Very rare decapod crustaceans, subject of this study, are sometimes discovered in thè quarry. Material The studied specimens are three-dimensionally preserved and their preparation was easy due to thè soft consistency of thè surrounding matrix. The study of thè three specimens, housed in thè Palaeontological Collections of Museo di Storia Naturale di Milano (MNSN), permitted their identification with thè Recent species, Ranilia constricta (A. Milne Edwards, 1880). The systematic arrangement used in this paper follows thè recent classification proposed by Martin & Davis (2001). Systematic Palaeontology Infraorder Brachyura Latreille, 1802 Section Podotremata Guinot, 1977 Subsection Archaeobrachyura Guinot, 1977 Superfamily Raninoidea De Haan, 1839 Family Raninidae De Haan, 1839 Subfamily Notopodinae Seréne & Umali, 1972 Included genera: Cosmonotus Adams & White, 1848 (fossil and Recent); Erro- ranilia Boyko, 2004 (fossil); Eumorphocorystes Binkhorst, 1857 (fossil); Lianira Beschin, Busulini, De Angeli, Tessier & Ungaro, 1991 (fossil); Lovarina Beschin, Busulini, De Angeli, Tessier & Ungaro, 1991 (fossil); Notopella Lòrenthey, 1929 (fossil); Notopus De Haan, 1841 (fossil and Recent); Pseudoraninella Lòrenthey in Lòrenthey & Beurlen, 1929 (fossil); Ranidina Bittner, 1893 (fossil); Ranilia H. Milne Edwards, 1837 (fossil and Recent); Raniliformis Jagt, Collins & Fraaije, 1993 (fossil); Umalia Guinot, 1993 (fossil and Recent). Genus Ranilia H. Milne Edwards, 1837 Discussion. The main previous diagnoses of this genus made by Rathbun ( 1937), Manning & Holthuis (1981), Williams (1984) and Melo & Campos Jr. (1994) did not consider thè presence of spines on thè orbitai margins of thè carapace because they were considered not important for thè ascription of living specimens to this genus. Since thè fossil crabs usually do not preserve stemal parts or gonopods (important morphological characters for thè ascription of living specimens), only some morphological characters of thè carapace are useful for their ascription to this living genus, as in thè case of thè studied specimens. So we emend thè diagnosis of Ranilia, including those morphological characters useful for thè ascription of thè fossil specimens. Diagnosis: carapace broadly ovai or subovai, strongly convex from side to side, flattened, almost straight in midiine; front slightly raised; orbits invisible from above, together forming inverted V directed obliquely ventral from rostrum; RANILIA CONSTRJCTA FROM THE TYRRHENIAN OF BOVETTO (CALABRIA, S ITALY) 11 rostrum slender, extending or not beyond innermost preorbitai spine; supraorbital and extraorbital spines more or less strong and prominent or lacking (see R. punc- tulata and R. guinotae); anterolateral margin with one more or less prominent and elongate spine; posterolateral margin smooth and slightly sinuous; eye stout with eye-stalk strong and elongate; antennae directed forward, basai article somewhat dilated mesially; outer maxillipeds with third article longer than second; stemal plastron linear between second legs, broadened to slightly concave; hexagonal disk between third and fourth pairs; fifth legs not remarkably reduced; fìrst right gono- pod with conical distai region; abdomen short and narrow (modifìed from Melo & Campos Jr., 1994). Type species: Rcmilia muricata H. Milne Edwards, 1837, by monotype. Included species: R. angustata Stimpson, 1860 (Recent); R. constricta (A. Milne Edwards, 1880) (fossil and Recent); R. fornicata (Faxon, 1893) (Recent); R. guinotae Melo & Campos Jr., 1994 (Recent); R. muricata H. Milne Edwards, 1837 (Recent); R. punctulata Beschin, Busulini, De Angeli & Tessier, 1988 (fossil); R. saldanhai Costa, 1970 (Recent). Geographical distribution: Western Atlantic (Florida, Gulf of Mexico, Antil- les, Colombia, and Brazil: R. constricta, R. guinotae, R. muricata, R. saldanhai), Central Atlantic (Ascension Island: R. constricta), Eastem Atlantic (from Senegai to Congo: R. constricta), Eastem Pacific (California Bay, Mexico, Ecuador and Galapagos Islands: R. angustata, R. fornicata). Ranilia constricta (A. Milne Edwards, 1880) Figs. 1-3 1880 - Raninops constrictus A. Milne Edwards; p. 35 1883 -Notopus (Raninoidesl) atlanticus Studer; p. 17, PI. 1 (fig. 5 a, b), nov. syn. 1889 - Raninoides atlanticus Studer in Studer; p. 48, 50, PI. 24 (fig. 7) 1923 - Ranilia constricta (A. Milne Edwards) in A. Milne Edwards & Bouvier; p. 302, PI. 1 (figs. 11-13), PI. 3 (figs. 2-5) 1937 - Ranilia constricta (A. Milne Edwards) in Rathbun; p. 20, PI. 4 (fig. 5), PI. 5 (figs. 1-2) 1939 - Notopus atlanticus Studer in Gumey; p. 103 (listed) 1956 - Ranilia atlantica (Studer) in Monod; p. 631, Text-figs. 17-18 1958 - Ranilia atlantica (Studer) in Longhurst; p. 87 1962 - Ranilia atlantica (Studer) in Rossignol; p. 113 (listed) 1970 - Ranilia constricta (A. Milne Edwards) in Gomes Corrèa; p. 2, Pls. 1-2, PI. 7 (figs. 56-58) 1970 - Ranilia atlantica (Studer) in Gomes Corrèa; p. 5 1970 - Ranilia constricta (A. Milne Edwards) in Gomes Corrèa; p. 2 1970 - Ranilia constricta (A. Milne Edwards) in Pequegnat; p. 180 1970 - Ranilia constricta (A. Milne Edwards) in Fonseca; p. 47 1972 - Ranilia constricta (A. Milne Edwards) in Coelho & Ramos; p. 178 1977 - Ranilia constricta (A. Milne Edwards) in Powers; p. 24 1997 - Ranilia constricta (A. Milne Edwards) in Spivak; Tab. 1 1980 - Ranilia constricta (A. Milne Edwards) in Rodriguez; p. 247 1981 - Ranilia constricta (A. Milne Edwards) in Manning & Elolthuis; p. 7, Text-figs. 1-2 1984 - Ranilia constricta (A. Milne Edwards) in Williams; p. 265, Text-fig. 196 1985 - Ranilia constricta (A. Milne Edwards) in Soto; Tab. 1 1986 - Ranilia constricta (A. Milne Edwards) in Abele & Kim; p. 455, Text-figs. b-c 1989 - Ranilia constricta (A. Milne Edwards) in Coelho, Ramos-Porto & Melo; p. 26 1989 - Ranilia constricta (A. Milne Edwards) in Melo, Veloso & Oliveira; p. 3 1989 - Ranilia constricta (A. Milne Edwards) in Williams, Abele, Felder, Hobbs Jr. & Manning; p. 77 1990 - Ranilia constricta (A. Milne Edwards) in Manning & Chace Jr.; p. 44, Text-fig. 25 12 ALESSANDRO GARASSINO & ANTONIO DE ANGELI 1990 - Raniìia constricta (A. Milne Edwards) in Werding & Muller; p. 217, Text-fìgs. 5 a, b 1994 - Ranilia constricta (A. Milne Edwards) in Melo & Campos Jr.; p. 63 1996 - Ranilia constricta (A. Milne Edwards) in Melo; p. 113 1998 - Ranilia constricta (A. Milne Edwards) in Camp, Lyons & Perkins; p. 145 2001 - Ranilia constricta (A. Milne Edwards) in Klein, Borzone & Pezzuto; Tab. 1 2003 - Ranilia constricta (A. Milne Edwards) in Nizinski; p. 120 2005 - Ranilia constricta (A. Milne Edwards) in McLaughlin et al.; p. 31 2007 - Ranilia constricta (A. Milne Edwards) in Garassino & De Angeli; p. 43, Tex-figs. 1 A-D Occurrence and measurements: we ascribe to this species three specimens (MSNM il3278, Ì22853, Ì22854) from thè Tyrrhenian (upper Pleistocene) of Bovetto (Reggio Calabria, S Italy). The sizes are expressed in millimetres. MSNM il3278: Wl = 13 MSNM Ì22853: Wl=12; W3=12; W4=4; Ll= >15 MSNM Ì22854: Wl=15; W2-7; W3=16; W4=5; Ll= >22 Discussion. The studied specimens show thè following morphological cha- racters: carapace subovai, strongly convex from side to side, flattened, almost strai- ght in midiine; front slightly raised; anterolateral margins of carapace subparallel and posterolateral margins convergent; maximum width of carapace between late- ral spines; preorbitai, supraorbital, and extraorbital spines strong and prominent; Fig. 1 - Ranilia constricta (A. Milne Edwards, 1880). Left: sketch of thè carapace and examined sizes: Wj= maximum width of thè carapace; W,=frontal-orbital width; L ^maximum length of thè carapace. (A sinistra: schema del carapace e delle misure considerate: W,=massima larghezza del carapace; W2=larghezza fronto-orbitale; L^lunghezza massima del carapace). Right: reconstruction of thè cara¬ pace (A destra: ricostruzione del carapace). RANILIA CONSTRICTA FROM THE TYRRHENIAN OF BOVETTO (CALABRIA, S ITALY) 13 Fig. 2 - Ranilia constricta (A. Milne Edwards, 1880), recostruction of thè cheliped (ricostruzione del chelipede). anterolateral margin with one spine prominent and elongate; orbits forming inver- ted V directed obliquely ventral from rostrum; dorsal surface of rostrum smooth; chelipeds stout having surface omamented with tubercles and cibate lines; movable fìnger of chela unarmed; palm of chela higher than long with ventral margin termi- nating in a strong spine, and with opposable margin not armed with teeth; merus of cheliped with blunt dorsal spine. The above-mentioned morphological characters are typical of Ranilia constricta (A. Milne Edwards, 1880) to which thè studied specimens are ascribed. This spe- cies is widespread in thè Western Atlantic (to Florida Straits and Yucatan Channel, Cuba, off Barbados, and Brazil), Central Atlantic (Ascension Island), and Eastem Atlantic (from Senegai to Congo). At present, only one species is recognised in thè fossil record, R. punctulata Beschin, Busulini, De Angeli & Tessier, 1988, from thè lower Eocene (Ypresian) of Valle del Chiampo (Vicenza, N Italy) (Beschin et al., 1988), since Feldmann & Maxwell (1990) ascribed R. pororariensis Glaes- sner, 1980, from thè upper Eocene of New Zealand to Laeviranina Lòrenthey & Beurlen, 1929. Muller (1993) ascribed some specimens from thè Pliocene of Spain to Ranilia, but this ascription is stili uncertain. Porteli & Roger (2003) published a peer-reviewed abstract on thè frog crab Ranilia from thè Pliocene of Florida (United States), and, as reported by Porteli & Agnew (2004), a new fossil species will be described. The problematic albuneid Paralbunea Hu & Tao, 1996 (P. taipeìensis Hu & Tao, 1996, type species) from thè lower Miocene of Taiwan, was considered to be an homonym genus of Paralbunea Seréne, 1977 (Schweitzer & Boyko, 2000). Boyko (2004) reviewed thè type specimens of P. taipeiensis Hu & Tao, 1996, including this species among thè Raninidae. He pointed out that thè morphologi- 14 ALESSANDRO GARASSINO & ANTONIO DE ANGELI Fig. 3 - Raniìia constricta (A. Milne Edwards, 1880), MSNM 122853. A) carapace in lateral view (carapace in norma laterale) (x 3). B) carapace in frontal view (carapace in norma frontale) (x 3). C) carapace in dorsal view (carapace in norma dorsale) (x 3). cal characters of thè holotype (Hu & Tao, 1996, PI. 11, figs. 2, 3) are so similar to those of Raniìia that he introduced thè new name Erroraniìia taipiensis (Hu & Tao, 1996). The paratype ofR taipeiensis (Hu & Tao, 1996, PI. 11, figs. 4, 6) was instead ascribed with some doubts to thè Recent Cosmonotus grayi Adams & White, 1848 (Boyko, 2004). Even though, thè plates of thè type specimens of P. taipeiensis exhi- bit poor preservation, thè arrangement of supraorbital margins is almost rectilinear and not directed backward as in Raniìia and Cosmonotus. This observation could suggest an ascription of this species to thè recent Umaìia Guinot, 1993, which is widespread in Indo-Pacific area and discovered from thè Pleistocene of Japan (Karasawa, 2000). Notopeììa Lòrenthey & Beurlen, 1929 (N. vareolata Lòrenthey & Beurlen, 1929, type species) was synonymised with Raniìia by Glaessner (1969) and Muller & Col¬ lins (1991), while Via Boada (1965, 1969), Jagt et ai. (1993), and Tucker (1998) con- sidered Notopeììa Lòrenthey, 1929, a valid genus within thè subfamily Notopodinae. RANILIA CONSTRICTA FROM THE TYRRHENIAN OF BOVETTO (CALABRIA, S ITALY) 15 Acknowledgements We wish to thank R. M. Feldmann, Geology Department, Kent State University (Ohio), for careful review and criticism and D. Affer, Museo di Storia Naturale di Milano, for thè careful preparation of thè studied specimens. References Beschin C., Busulini A., De Angeli A. & Tessier G., 1988 - Raninidae del Terziario berico-lessineo (Italia settentrionale). Lavori - Società Veneziana di Scienze Naturali, Venezia, 13: 155-215. Boyko C. B., 2004 - The problematic Paralbunea Hu and Tao, 1996: homonymy, generic nom. nov., and correct taxonomic placement. Palaeontology’, London, 47 (4): 929-932. Feldmann R. M. & Maxwell R A., 1990 - Late Eocene Decapod Crustacea from North Westland, South Island, New Zealand. Journal of Paleontology, Law¬ rence, 64 (5): 779-797. Fraaije R. H. B. & Van Bakel B. W. M., 1997 - New raninid crabs (Crustacea, Decapoda, Brachyura) from thè late Maastrichtian of The Netherlands. Geolo¬ gie en Mijnbouw, 76: 293-299. Glaessner M. F., 1969 - Decapoda. In: Treatise on Invertebrate Paleontology, Moore R. C. (ed.). 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