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Gladius Shape Variation in Coleoid Cephalopod Trachyteuthis from the Upper Jurassic Nusplingen and Solnhofen Plattenkalks

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Gladius Shape Variation in Coleoid Cephalopod Trachyteuthis from the Upper Jurassic Nusplingen and Solnhofen Plattenkalks Gladius shape variation in coleoid cephalopod Trachyteuthis from the Upper Jurassic Nusplingen and Solnhofen Plattenkalks DIRK FUCHS, THEO ENGESER, and HELMUT KEUPP Fuchs, D., Engeser, T., and Keupp, H. 2007. Gladius shape variation in coleoid cephalopod Trachyteuthis from the Upper Jurassic Nusplingen and Solnhofen Plattenkalks. Acta Palaeontologica Polonica 52 (3): 575–589. Although the fossil record of coleoid cephalopods is generally poor, the Upper Jurassic Nusplingen and Solnhofen Plattenkalks have provided numerous well−preserved coleoids. Trachyteuthis hastiformis, a comparatively large vam− pyropod coleoid, was previously known to represent the sole species of its genus in Nusplingen and Solnhofen. However, morphological comparisons based on 50 specimens from different museum collections revealed two additional species: T. nusplingensis sp. nov. and T. teudopsiformis sp. nov. Both species lack the distinct spindle−shaped elevation on the gladius median field typical for T. hastiformis. T. nusplingensis sp. nov. is clearly characterised by a smooth median field and a more or less regular granulation on the dorsal gladius surface, whereas T. teudopsiformis sp. nov. can be easily dis− tinguished by the presence of a Teudopsis−like median keel and an extremely narrow granulation. Morphometric analyses have shown that length−width indices are ambiguous characters to differentiate between the three species. Phylogeneti− cally, the keeled and anteriorly pointed T. teudopsiformis sp. nov. can be linked with the Early Jurassic genus Teudopsis and the Late Cretaceous genus Glyphiteuthis. Key words: Cephalopoda, Coleoidea, Vampyropoda, Trachyteuthis, gladius, Kimmeridgian, Tithonian. Dirk Fuchs [[email protected]−berlin.de], Theo Engeser [[email protected]−berlin.de], and Helmut Keupp [keupp@ zedat.fu−berlin.de], Freie Universität Berlin, Institut für Geologische Wissenschaften, Fachrichtung Paläontologie, Malteserstr. 74−100, D−12249 Berlin, Germany. Introduction BMNH, Natural History Museum London, UK; PIMUZ, Paläontologisches Institut und Museum, Universität Zürich, Trachyteuthis is an extinct genus of vampyropod coleoid with Switzerland; SMF, Senkenberg Museum, Frankfurt/Main, a stratigraphic occurrence from the Callovian (Middle Juras− Germany; SMNS, Staatliches Museum für Naturkunde, sic) to the Cenomanian (Late Cretaceous). The morphological Stuttgart, Germany; SOS, Jura Museum, Eichstätt, Germany. knowledge of Trachyteuthis is based mainly on specimens from the Kimmeridgian Nusplingen and the Tithonian Soln− hofen Plattenkalks (both Upper Jurassic). Thanks to the ex− traordinary preservation found in the Nusplingen and Soln− Historical background hofen Plattenkalks, Tr. hastiformis (Rüppel, 1829) belongs to the best known fossil coleoids. Although Tr. hastiformis is Knorr (1773: pl. 22: 2) was the first to illustrate an example of generally considered to represent the only trachyteuthid in Trachyteuthis. He identified it as fish remains. Rüppell (1829: Nusplingen and Solnhofen, many additional species have 9) is credited with being the first to fully describe Sepia been proposed in the past two hundred years of research; and hastiformis from the Solnhofen area. Rüppell (1829) and indeed, gladii (singular gladius; the chitinous pen in the dorsal many subsequent palaeontologists considered the preserved mantle) seem to vary in shape and size. If we do not want to as− remnants to be a fossil cuttlebone of Sepia. Eight years later sume each state of preservation to be a separate species, it is Münster (1837) recognised eight species (S. hastiformis, S. urgently necessary to conduct a comparative morphological obscura, S. regularis, S. linguata, S. gracilis, S. venusta, S. study which might reveal whether one or more species existed. caudata,andS. antiqua) in the Solnhofen Plattenkalks but It was therefore the aim of the present study to examine the de− gave neither descriptions nor illustrations of these species. tailed gladius morphology of Trachyteuthis based on a high Count G.G. Münster was in poor health and provided his un− number of specimens. published drawings and descriptions to Alcide d’Orbigny who finally published them in a series of publications (Férrussac Institutional abbreviations.—G, Museum Bérger, Eichstätt, and d'Orbigny 1835–48, d'Orbigny 1845–46). Count Münster Germany; MARKA, Markgrafenmuseum, Ansbach, Ger− died in 1844 before he could complete his work, and Wilhelm many; MB.C, Museum für Naturkunde, Berlin, Germany; Dunker, the editor of the seventh volume of the “Beiträge zur Acta Palaeontol. Pol. 52 (3): 575–589, 2007 http://app.pan.pl/acta52/app52−575.pdf 576 ACTA PALAEONTOLOGICA POLONICA 52 (3), 2007 Petrefaktenkunde”, finally published again an incomplete ma− formis achieved general acceptance (Naef 1922; Jeletzky nuscript by Münster (Münster 1846). In Férrussac and d'Or− 1966; Donovan 1977; Bandel and Leich 1986; Engeser bigny (1835–48), d'Orbigny revised Münster's ideas and pre− 1988; Doyle et al. 1994; Haas 2002; Donovan et al. 2003). sented Sepia hastiformis, S. antiqua, S. caudata, S. lingulata, The systematic affiliation of Trachyteuthis was long under and S. venusta, although he mentioned that specific distinc− debate. Naef (1922) and Jeletzky (1966) put Trachyteuthis tions are mainly due to ontogenetic differences or preserva− along with so−called “fossil teuthids”, whereas Donovan tional artefacts. It is worth to note that d'Orbigny's knowledge (1977) assigned it to sepiids. Later on, Bandel and Leich was merely based on notes and drawings by Münster. He had (1986) introduced an alternative idea. Since Trachyteuthis and never investigated original material. other “fossil teuthids” such as Plesioteuthis and Leptotheuthis In the meantime, Meyer (1846) recognised the morpholog− never show more than eight arms, Bandel and Leich (1986) re− ical differences between fossil and living forms and erected garded them as early members of the Vampyromorpha. A dis− the genus Trachyteuthis. He disregarded older publications covery of two pairs of fins recently supported vampyropod af− and distinguished two species, T. ensiformis and T. oblonga filiations of Trachyteuthis (Donovan et al. 2003). from the Solnhofen Plattenkalks, but without giving detailed descriptions and illustrations. Almost ten years later Meyer (1855) provided an extensive description of T. ensiformis. Material and methods Owen (1855) was the first to report a “sepiid−like cuttle− bone” in the Kimmeridge Clay of England, Coccoteuthis Between 2002 and 2005 more than 20 different museum col− latipinnis Owen, 1855. He suggested that Coccoteuthis, lections were visited. A total number of 50 specimens from which is identical with Trachyteuthis, is intermediate be− the Upper Jurassic Plattenkalks of Nusplingen and Soln− tween Sepiidae and Loliginidae. hofen labelled as Trachyteuthis were investigated. The stud− Wagner (1860), who re−examined Münster's specimens, ied material included the type species of Trachyteuthis, discussed generic and specific names circulating in the litera− Trachyteuthis ensiformis Meyer, 1846 and the holotype of ture and concluded that each species is identical with S. Trachyteuthis hastiformis (Rüppell, 1829). Apart from these hastiformis. In the following years Trachyteuthis was vari− “German” specimens we had also the opportunity to investi− ously treated as a diverse genus or as monospecific. How− gate specimens of Trachyteuthis from the Callovian and ever, during the twentieth century only Trachyteuthis hasti− Kimmeridgian of England, the Oxfordian of Chile, the Table 1. Comparative measurements of type specimens of Trachyteuthis hastiformis, Trachyteuthis nusplingensis and Trachyteuthis teudopsi− formis. Note that not preserved indices are omitted. Abbreviations: Aia, angle of diverging inner asymptotes; Aga, angle of granulated area; GL, gladius length; GW1/2gl, gladius width at half way along the gladius length; GWhz, gladius width at the anterior limit of the hyperbolar zone; GWlf, gladius width at the anterior limit of the lateral field; GWmax, maximum gladius width; HZL, hyperbolar zone length; LFL, lateral field length. Trachyteuthis Trachyteuthis Trachyteuthis hastiformis (Rüppell, 1829) nusplingensis sp. nov. teudopsiformis sp. nov. Measurements MARKA1 SMF IX1328 SMNS 63596 G 130606 (original of SOS 5762 (holotype) (holotype) (holotype) Meyer 1846) GL 225 + x mm 295+ x mm 325 mm 280+3 mm (interpolated) 70+x mm (incomplete) HZL ? ? 125±2 mm 100+3 mm (interpolated) 30 mm LFL ? ? 109±2 mm 90 mm 26 mm GWhz ? ? 87±2 mm 77 mm 25 mm GWlf ? ? 108±2 mm 97 mm 33 mm GWmax ? ? 113±2 mm 109 mm 37 mm GW1/2gl ? ? 83±2 mm 75 mm ? Aia ??40° 40° 43° Aga \ \ \ 12° restricted to keel HZL/GL ? 0.39–0.42 0.39–0.4 0.36 ? LFL/GL ? ? 0.34–0.35 0.32 ? GWhz/GL ? ? 0.27–0.28 0.27 ? GWlf/GL ? ? 0.34–0.35 0.34 ? GWmax/GL ? ? 0.35–0.37 0.39 ? GW1/2gl/GL ? ? 0.26–0.27 0.27 ? GWmax/HZL ? ? 0.87–0.93 1.05 ? Granulation coarse, irregular coarse, irregular coarse, irregular fine, regular narrow Spindel−shaped elevation present present present absent absent FUCHS, ENGESER, AND KEUPP—GLADII OF VAMPYROPOD COLEOIDS 577 median median field field gladius length gladius length gladius width 1/2 gladius length inner hyperbolar zone length asymptote lateral field length gladius width outer end hyperbolar zone growth asymptote line gladius width hyperbolar zone length end lateral field maximum lateral field length gladius width hyperbolar zone lateral field apical angle inner asymptote Fig. 1. Morphology, terminology and measurements of a vampyropod
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