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First Record of Dromia Neogenica Müller, 1979 (Decapoda, Brachyura, Dromiidae) from Neogene Strata in the Southern North Sea Basin

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First Record of Dromia Neogenica Müller, 1979 (Decapoda, Brachyura, Dromiidae) from Neogene Strata in the Southern North Sea Basin FIRST RECORD OF DROMIA NEOGENICA MÜLLER, 1979 (DECAPODA, BRACHYURA, DROMIIDAE) FROM NEOGENE STRATA IN THE SOUTHERN NORTH SEA BASIN BY RENÉ H.B. FRAAIJE1,4), BARRY W.M. VAN BAKEL1,2,5) and JOHN W.M. JAGT3,6) 1) Oertijdmuseum De Groene Poort, Bosscheweg 80, NL-5283 Boxtel, The Netherlands 2) Nederlands Centrum voor Biodiversiteit (Naturalis), P.O. Box 9517, NL-2300 RA Leiden, The Netherlands 3) Natuurhistorisch Museum Maastricht, de Bosquetplein 6-7, NL-6211 KJ Maastricht, The Netherlands ABSTRACT The sponge crab Dromia neogenica Müller, 1979 (Dromiidae) is recorded for the first time from strata of Neogene (late Miocene-early Pliocene) age in the southern North Sea Basin, on the basis of two concretion-preserved carapaces from Bemmel (north of Nijmegen, province of Gelderland, The Netherlands). The presence of this species, which was previously known from the middle-upper Miocene of Hungary and Algeria, suggests relatively higher seawater temperatures in the North Sea during the late Miocene-early Pliocene. Morphological differences (extraorbital and anterolateral teeth, development of cervical and branchiocardiac grooves) between D. neogenica and extant D. personata (Linnaeus, 1758) are relatively minor. This observation, coupled with the absence of the former species in mid-Pliocene and younger strata, and with the robust record of the latter in the mid-Pliocene to upper Pleistocene of Italy, would indicate that D. neogenica and D. personata are closely related, and probably represent the same lineage. RÉSUMÉ La dromie éponge Dromia neogenica Müller, 1979 (Dromiidae) est signalée pour la premiére fois dans les strates du Néogène (fin du Miocène-début du Pliocène) du sud du bassin de la mer du Nord. Le matériel étudié comprend deux moulages de carapaces de Bemmel (nord de Nijmegen, province de Gelderland, Pays-Bas). Le nouveau signalement de cette espèce, qui n’était connue que du milieu du Miocène supérieur de Hongrie et d’Algérie, suggère, que 4) Corresponding author; e-mail: [email protected] 5) e-mail: [email protected] 6) e-mail: [email protected] © Koninklijke Brill NV, Leiden, 2010 Studies on Malacostraca: 231-240 232 CRM 014 – Fransen et al. (eds.), LIPKE BIJDELEY HOLTHUIS MEMORIAL VOLUME la température de l’eau de mer était relativement plus élevée dans la mer du Nord à la fin du Miocène et au début du Pliocène. Les différences morphologiques (dents extraorbitales et anterolatérales, développement des sillons cervicaux et branchiocardiaques) entre D. neogenica et l’espèce actuelle D. personata (Linnaeus, 1758) sont relativement faibles. Cette observation jointe à l’absence de la première espèce au Pliocène moyen et dans les strates plus récentes, et à l’abondance de cette dernière en Italie dans la période allant du Pliocène moyen au Pléistocène, indiqueraient que D. neogenica et D. personata seraient étroitement apparentées, voire qu’elles appartiendraient à la même lignée. INTRODUCTION Records of Neogene anomurans and brachyurans from the southern North Sea Basin (The Netherlands) are comparatively rare, although assemblages have proved to be fairly diverse. Holthuis (1949) was the first to describe and illustrate decapod crustacean faunules of Miocene and younger age in this area, mostly collected from borehole material. He listed: 1. Cancer deshayesii from the lower Miocene of the Achterhoek (province of Gelderland) and of the Peel district (provinces of Noord-Brabant and Limburg). Probably, these records do not pertain to that species, which is a synonym of Lobocarcinus sismondai (von Meyer, 1843) (see Schweitzer & Feldmann, 2000; Collins, 2003), but rather refer to another cancrid, Tasadia carniolica (Bittner, 1884) (cf. Janssen & Müller, 1984); 2. Anapagurus laevis (Bell, 1845), Maja squinado (Herbst, 1788) and an indeterminate portunid from the upper Pliocene of the provinces Noord- Brabant and Zeeland; 3. Pagurus bernhardus (Linnaeus, 1758), Cancer pagurus Linnaeus, 1758, Carcinus maenas (Linnaeus, 1758), Liocarcinus holsatus (Fabricius, 1798) and M. squinado from the lower Pleistocene in the provinces of Noord-Brabant, Zuid-Holland and Zeeland; and 4. Carcinus maenas and Liocarcinus holsatus from younger deposits in the province of Noord-Holland. During the last two decades, extensive fieldwork at a number of localities in the provinces of Noord-Brabant and Gelderland has resulted in new collections of decapod crustaceans. Upper Miocene strata at Liessel produced a new cancrid, Cancer parvidens Collins & Fraaye, 1991, as well as Maja squinado, Pagurus bernhardus and Pisa armata (Latreille, 1803) (see Peters, 2009). From Pliocene deposits at Mill-Langenboom (for details, see Wijnker et al., 2008) at least nine species of decapod crustaceans are known to date. Van.
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