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New Reports of Decapod Portunus Monspeliensis A. Milne Edwards, 1860 from Miocene Beds of Eastern Slovenia with Notes on Palaeoecology and Palaeobiogeography

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New Reports of Decapod Portunus Monspeliensis A. Milne Edwards, 1860 from Miocene Beds of Eastern Slovenia with Notes on Palaeoecology and Palaeobiogeography GEOLOGIJA 59/1, 55-66, Ljubljana 2016 © Author(s) 2016. CC Atribution 4.0 License http://dx.doi.org/10.5474/geologija.2016.005 New reports of decapod Portunus monspeliensis A. Milne Edwards, 1860 from Miocene beds of eastern Slovenia with notes on palaeoecology and palaeobiogeography Nove najdbe rakovice Portunus monspeliensis A. Milne Edwards, 1860 iz miocenskih plasti vzhodne Slovenije z opisom paleookolja in njihove paleogeografske razširjenosti Rok GAŠPARIČ1,2 & Àlex OSSÓ3 1Oertijdmuseum De Groene Poort, Bosscheweg 80, 5293 WB Boxtel, the Netherlands; e-mail: rok.gasparic�gmail.com 2Ljubljanska cesta 4j, SI–1241 Kamnik, Slovenija; e-mail: rok.gasparic�gmail.com 3Josep Vicenç Foix 12-H, 1er-1a 43007 Tarragona, Spain; e-mail: aosso�comt.cat Prejeto / Received 2. 5. 2016; Sprejeto / Accepted 1. 6. 2016; Objavljeno na spletu / Published online 11. 8. 2016 Key words: Portunus monspeliensis, Decapoda, Miocene, Badenian, Central Paratethys, Palaeogeography, Palaeoecology, Slovenia Klju~ne besede: Portunus monspeliensis, deseteronožci, miocen, badenij, Centralna Paratetida, paleogeografija, paleoekologija, Slovenija Abstract In the present paper we report on several new occurrences of decapod Portunus monspeliensis A. Milne Edwards, 1860 from Miocene beds of eastern Slovenia, i. e. from the already known locality Šentilj in the northeastern Štajerska region and additional new localities in the Kozjansko and Dolenjska regions. These new reported occurrences of P. monspeliensis from the Middle Miocene (Badenian) strata of eastern Slovenia improve our knowledge of this otherwise widespread decapod crustacean. Additionally, we also re-evaluate the environmental preferences of the species and its wider palaeobiogeographical distribution during the Miocene in the Mediterranean, Atlantic and Paratethys Seas. Izvle~ek V pričujočem članku poročamo o novih primerkih rakovic vrste Portunus monspeliensis A. Milne Edwards, 1860 iz miocenskih plasti v vzhodni Sloveniji, in sicer iz že znanega najdišča pri Šentilju v severovzhodnem delu Štajerske in iz novih nahajališč iz območja Kozjanskega in Dolenjske. Nove najdbe iz miocenskih plasti vzhodne Slovenije dopolnjujejo naše poznavanje vrste P. monspeliensis. Med drugim v članku na novo opredeljujemo okoljske preference te vrste in njeno širšo paleobiogeografsko razširjenost v obdobju miocena na območju Sredozemskega morja, Atlantskega oceana in Paratetide. Introduction The remains of P. monspeliensis are one of the most abundant Miocene crabs and almost always The portunid crab Portunus monspeliensis represent the dominant decapod species in the A. Milne Edwards, 1860 has a widespread strata where they occur. They are almost exclusively distribution during the Miocene period. The found in siliciclastic sediments such as sandstones species has been reported from the Mediterranean, and calcarenites, and their state of preservation is the Paratethys as well as from Atlantic coastal mostly not good. Due to their size, they are usually waters. It is known from Miocene sediments of compressed, fractured and lacking exocuticle. Austria, France, Hungary, Italy, Malta, Portugal, Only recently illustrated specimens from the Spain, Slovenia, Egypt and the Sinai Peninsula marly limestone of the middle Miocene Sardinia (MILNE EDWARDS, 1860; RISTORI, 1888; GLAESSNER, (MARANGON & DE ANGELI, 2009) are exceptionally 1928, 1933; LÖRENTHEY & BEURLEN, 1929; VIA, 1932; well preserved and provide better insight on the MÜLLER, 1979, 1984, 1993; MIKUž, 2003; GATT, 2006). species morphology of the dorsal carapace. 56 Rok GAŠPARIČ & Àlex OSSÓ Despite the widespread distribution and to the genus Lupa (junior objective synonym of common occurrence, this fossil portunid species Portunus) and closely resembling extant species has not received relevant scientific attention in the Lupa dicantha or Lupa spinimana. This historical last decades. In the 19th and in the beginning of specimen can no longer be located, but likely the 20th century several authors (VIA, 1923; VEIGA represents the first documented find of the crab FERREIRA, 1954; PHILIPPE & SECRETAN, 1971) have Portunus monspeliensis and the first recognized reported the European specimens under different, find of a fossil decapod crustacean in Slovenia. synonymous, names: Lupa hastata LINNAEUS, 1767; Neptunus convexus RISTORI, 1888; and Neptunus Geology and stratigraphy of the localities granulatus A. Milne Edwards,, 1860. Beside these recognized synonyms of P. monspeliensis, The newly presented specimens originate from there are currently over 40 valid fossil species various localities of the former Central Paratethys of genus Portunus WEBER, 1795 (KARASAWA et al., Sea that covered the eastern part of Slovenia in the 2008), and many of them were described only Miocene period (Fig. 1). The following localities from single poorly preserved specimens or chelae. yielded new material of this widespread decapod Although even a superficial investigation of the crustacean: fossil representatives of the genus shows great morphological variations, descriptions of fossil species usually illustrate carapaces lacking cuticle, severally fragmented specimens, and descriptions of isolated chelipeds. As it has already been pointed out by KARASAWA and co-authors (2008) a re-evaluation and revision of all fossil species of Portunus would be welcome, but that is out of the scope of the present paper. The only know occurrence of fossil remains of P. monspeliensis from the Miocene strata of Slovenia so far is the report of 27 fragments of this decapod (five carapaces) from Badenian sandstones of Šentilj (MIKuž, 2003). Interestingly, KrižnAR (2014) also presents a historical report of donations of a fossil crab specimen to the Nature History Museum in Vienna in 1850. The original report of this donation was published in the Leibacher Zeitung newspaper on the 21st of February 1853 and details the donations done in 1850 as: “Der hochwertige Herr Primus Remiz, Cooperator in Grossdolina, welcher Herrn Freyer bei seinen geognostischen Wanderungen ein Paar Tage zu begleiten die Gefälligkeit hatte, verehrte dem Museum eine fossile Krabbe, welche er in Tschatesch am nördlichen Bügel nächst der Strasse ob der Post gefunden hat. Eine ausgezeichnete Stelle und reiche Fundgrube zur Zussammlung Fig. 1. Simplified geographical map of East Slovenia showing von fossilen Muscheln, Schneckenschalen usw... all known occurrences of decapod Portunus monspeliensis Herr Vincenz Kollar, Kustos der vereinigten k. A. Milne Edwards, 1860. 1 – Štrihovec / Šentilj, 2 – Gruška / k. Hof-Naturalien-Cabinete, wirkl Mitglied der Kozje, 3 – Trebče / Bistrica ob Sotli, 4 – Dolnja Stara vas, 5 – Kaiserliche Academie der Wissenschaften zu Wien, Šentvid / Čatež.) hatte die Gewogenheit, oberwähnten Krebsen zu bestimmen, mit den Worten: “Dieser Krebs 1. Štrihovec / Šentilj gehört zu der recenten Gattung Lupa, stimmt Štrihovec was until recently the only known in Größe und den Verhältnissen der einzelnen locality with fossil remains of P. monspeliensis from Theile mit Lupa dicantha Latreille und Milne the Slovenian territory (MIKuž, 2003). Štrihovec is Edwards überein, und scheint zunächst mit Lupa situated near Šentilj, a town in northeast Slovenia, spinimana Milne Edwards verwandt. Auf jeden bordering on Austria. The fossil bearing layers Fall nähert sich diese Art den Formen, welche an were accessible in the years 1995/1996, when den amerikanischen Küsten vorkommen”. middle Miocene (Badenian) sandstone, marl, and lithothamnium limestone were exposed during The cited passage in German, illustrates the construction works for the new highway. finding of a fossil crab by Mr. Primož Remic in today’s town Čatež (on the hill north of the Post) A rich association of macrofossils was collected in eastern Slovenia, who sent it to the curator Mr. by amateur collectors and described in the Vincenz Kollar from the Nature History Museum following years (MIKuž 1997, 1998, 2003, 2008; in Vienna. Mr. Kollar determined it as belonging MIKuž & MITROVIć-PETROVIč, 2001). The represented New reports of decapod Portunus monspeliensis A. Milne Edwards 57 fossil taxons include brachiopods, pectinid bivalve comprising mostly of bivalve species with rare fauna, clypeasteroid echinoderms, octocorals, gastropods and cirripeds was described from the nautiloids, and crabs. sandstones and calcarenites (MIKuž & PETRIč, 2008), from which we also collected a specimen of 2. Gruška / Kozje the P. monspeliensis. One decapod crab specimen was recovered from the Gruška jama locality near the town 5. Šentvid / Čatež of Kozje in eastern Slovenia, close to border of Grey to yellowish sandstones and calcarenites Croatia. The Middle Miocene (Badenian) strata interbedded with grey siltstone are exposed along exposed here are comprised of sandstone and the slopes of hill St. Vid, south of Brežice in eastern lithothamnium limestone (ANIčić & Juriša, Slovenia. Similarly to the wider surrounding 1985), where macrofossils are rare. Sporadic area this lithology is part of the middle Miocene finds from this locality comprise mostly poorly (Badenian) Čatež formation sequence (RižnAR et preserved bivalves with dissolved shells and rare al., 2002). So far only sporadic finds of echinoderm echinoderms (MIKuž, 2010). fragments and indeterminable bivalves are reported from these beds. The crab specimens are 3. Trebče / Bistrica ob Sotli surprisingly common in the yellowish calcarenites This specimen was retrieved from a road cut in this locality. on local road from Trebče towards
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