Published March 6, 2026 | Version v1
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Revision of the extinct shark Synechodus prorogatus Kriwet, 2003 (Chondrichthyes, Elasmobranchii) and its galeomorph affiliation

  • 1. Faculty of Earth Sciences, Geography and Astronomy, University of Vienna, Vienna, Austria|Vienna Doctoral School of Ecology and Evolution (VDSEE), University of Vienna, Vienna, Austria
  • 2. Faculty of Earth Sciences, Geography and Astronomy, University of Vienna, Vienna, Austria
  • 3. Georg-August University Göttingen, GZMB, Göttingen, Germany

Description

The majority of the fossil records of elasmobranch fishes (sharks, rays, skates) consists of isolated teeth and dermal denticles. Over their long and complex evolutionary history, dental remains are particularly indicative of the group's plasticity and adaptability, which has hampered the classification of fossil species with highly specialised dental morphologies that deviate from those of extant species. One of such cases is †Synechodus prorogatus recovered from Middle and Late Jurassic deposits in Poland and Germany. Its original description and diagnosis were based on a single complete and two very incomplete teeth, which showed a very peculiar morphology with some features resembling several groups. These similarities resulted in its placement within synechodontiforms. However, subsequent findings showing numerous differences with the type species of the genus, †Synechodus dubrisiensis, cast doubt on its assignment within this group and this genus. Here, we describe new material from Upper Jurassic offshore deposits in SW Germany, which provides additional information about this species. We conducted a comprehensive morphological comparison between †S. prorogatus, various Jurassic selachian taxa and the type species of †Synechodus, †S. dubrisiensis (Late Cretaceous, England), confirming the taxonomic distinctiveness of this Jurassic species, which requires the establishment of a new genus, †Curvorudentis, with †C. prorogatus gen. et comb. nov. being type species. The discovery of this taxon in Late Jurassic deposits of Germany represents its stratigraphically youngest occurrence, extending its chronostratigraphic range and geographical distribution. †Curvorudentis prorogatus is considered here a galeomorph shark, rather than being a member of the stem clade †Synechodontiformes, although its precise systematic position within this group remains ambiguous.

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References

  • Beaumont de G (1960) Contribution à l'étude des genres Orthacodus Woodw. et Notidanus Cuv. (Selachii). Mémoires Suisses de Paléontologie 77: 1–46.
  • Bass AJ, d'Aubrey JD, Kistnasamy N (1973) Sharks of the east coast of southern Africa. I. The genus Carcharhinus (Carcharhinidae). Investigational Report Oceanographic Research Institute 33: 1–168.
  • Bonaparte CL (1838) Selachorum tabula analytica. Nuovi Annali dell Scienze Naturali, Bologna 2: 195–214.
  • Candoni L (1993) Découverte de Parasymbolus octevillensis gen. et sp. nov. (Scyliorhinidae – Elasmobranchii) dans le Kimméridgien de Normandie, France. In: Herman J, Van Waes H (Eds) Elasmobranches et Stratigraphie. Professional Papers of the Geological Survey of Belgium 264: 147–156.
  • Cappetta H (1986) Types dentaires adaptatifs chez les sélaciens actuels et post-Paléozoïques. Palaeovertebrata 16(2): 57–76.
  • Cappetta H (2012) Chondrichthyes. Mesozoic and Cenozoic Elasmobranchii: Teeth. In: Schultze H-P (Ed.) Handbook of Paleoichthyology, Volume 3E, Mesozoic and Cenozoic Elamobranchii: Teeth. Verlag Dr. Friedrich Pfeil, München, 512 pp.
  • Carvalho de MR (1996) Higher-Level Elasmobranch Phylogeny, Basal Squaleans, and Paraphyly. In: Stiassny MLJ, Parenti LR, and Johnson GD (Eds) Interrrelationships of Fishes, Chapter 3. Academic Press, San Diego, 35–63. https://doi.org/10.1016/b978-012670950-6/50004-7
  • Casier E (1947) Constitution et évolution de la racine dentaine des Euselachii. II. Étude comparative des types. Bulletin du Musée royal d'Histoire naturelle de Belgique 23(14): 1–32.
  • Compagno LJV (1970) Systematics of the genus Hemitriakis (Selachii: Carcharhinidae), and related genera. Proceedings of the California Academy of Sciences, fourth series, 38(4): 63–98.
  • Compagno LJV (1973) Interrelationships of living elasmobranchs In: Greenwood PH, Miles RS and Patterson C (Eds) Interrelationships of Fishes. Zoological Journal of the Linnean Society 53(1) Suppl.: 15–61.
  • Compagno LJV (1990) Alternative life-history styles of cartilaginous fishes in time and space. Environmental Biology of Fishes 28: 33–75. https://doi.org/10.1007/978-94-009-2065-1_3
  • Duffin CJ (1988) The Upper Jurassic selachian Palaeocarcharias de Beaumont (1960) Zoological Journal of the Linnean Society 94: 271–286. https://doi.org/10.1111/j.1096-3642.1988.tb01196.x
  • Duffin CJ, Ward DJ (1993) The early Jurassic Palaeospinacid sharks of the Lyme Regis, southern England. In: Herman J, Van Waes H (Eds) Elasmobranches et Stratigraphie. Professional Papers of the Geological Survey of Belgium 264: 53–101.
  • Ebert DA, Dando M, Fowler S (2021) Sharks of the World: a complete guide. Princeton: Princeton University Press, 607 pp. https://doi.org/10.1515/9780691210872
  • Enault S, Guinot G, Koot MB, Cuny G (2015) Chondrichthyan tooth enameloid: past, present, and future. Zoological Journal of the Linnean Society 174(3): 549–570. https://doi.org/10.1111/zoj.12244
  • Glikman LS (1957) On the relationships between the families Lamnidae and Odontaspidae and on new lamnid genera from the Late Cretaceous. Trudy Geologischeskogo Muzeja 'A. P. Karpinskogo', Akademia Nauk SSSR 1: 110–117. [In Russian]
  • Guinot G, Adnet S, Shimada K, Underwood CJ, Siversson M, Ward DJ, Kriwet J, Cappetta H (2018) On the need of providing tooth morphology in descriptions of extant elasmobranch species. Zootaxa 4461(1): 118–126. https://doi.org/10.11646/zootaxa.4461.1.8
  • Guinot G, Vullo R, Peyer K, Reneleau V (2025) An articulated skeleton of the neoselachian shark Palaeocarcharias from the Late Jurassic Canjuers Lagerstätte (southeastern France). Annales de Paléontologie 111(1): 102738. https://doi.org/10.1016/j.annpal.2024.102738
  • Herman J, Hovestadt-Euler M, Hovestadt DC (1990) Part A: Selachii. No. 2b: Order: Carcharhiniformes - Family: Scyliorhinidae. In: Stehmann M (Ed.) Contributions to the study of the comparative morphology of teeth and other relevant ichthyodorulites in living supraspecific taxa of Chondrichthyan fishes. Bulletin de l'Institut Royal des Sciences Naturelles de Belgique, Biologie 60: 181–230.
  • Herman J, Hoverstadt-Euler M, Hovestadt DC (1991) Part A: Selachii. No. 2c: Order: Carcharhiniformes Families : Proscylliidae, Hemigaleidae, Pseudotriakidae, Leptochariidae and Carcharhinidae. In: Stehmann M (Ed.) Contributions to the study of the comparative morphology of teeth and other relevant ichthyodorulites in living supraspecific taxa of Chondrichthyan fishes. Bulletin de l'Institut Royal des Sciences Naturelles de Belgique, Biologie 61: 73–120.
  • Hilgendorf FM (1904) Ein neuer Scyllium-artiger Haifisch, Proscyllium habereri, nov. subgen., n. spec. von Formosa. Sitzungsberichte der Gesellschaft Naturforschender Freunde zu Berlin 1904 (2): 39–41.
  • Huxley TH (1880) On the application of the laws of evolution to the arrangement of the Vertebrata, and more particularly of the Mammalia. Proceedings of the Zoological Society of London 1880: 649–661.
  • Ivanov A (2005) Early Permian chondrichthyans of the middle and south Urals. Revista Brasileira de Paleontologia 8(2): 127–138. https://doi.org/10.4072/rbp.2005.2.05
  • Jambura PL, Villalobos-Segura E, Türtscher J, Begat A, Staggl MA, Stumpf S, Kindlimann R, Klug S, Lacombat F, Pohl B, Maisey JG, Naylor G, Kriwet J (2023) Systematics and phylogenetic interrelationships of the enigmatic Late Jurassic shark Protospinax annectans Woodward, 1918 with comments on the shark-ray sister group relationship. Diversity 15(3): 311. https://doi.org/10.3390/d15030311
  • Johns MJ, Barnes CR, Orchard MJ (1997) Taxonomy and biostratigraphy of Middle and Late Triassoc elasmobranch ichthyoliths from northeastern British Columbia. Geological survey of Canada, Bulletin 502, 235 pp. https://doi.org/10.4095/209171
  • Klug S (2009) A new palaeospinacid shark (Chondrichthyes, Neoselachii) from the Upper Jurassic of southern Germany. Journal of Vertebrate Paleontology 29(2): 326–335. https://doi.org/10.1671/039.029.0203
  • Klug S (2010) Monophyly, phylogeny and systematic position of the †Synechodontiformes (Chondrichthyes, Neoselachii). Zoologica Scripta 39(1): 37–49. https://doi.org/10.1111/j.1463-6409.2009.00399.x
  • Klug S, Kriwet J (2006) Anatomy and systematics of the Early Jurassic neoselachian shark Synechodus smithwoodwardi (Fraas, 1896) from southern Germany. Neues Jahrbuch für Geologie und Paläontologie-Monatshefte 2006(4): 193–211. https://doi.org/10.1127/njgpm/2006/2006/193
  • Klug S, Kriwet J (2008) A new basal galeomorph shark (Synechodontiformes, Neoselachii) from the Early Jurassic of Europe. Naturwissenschaften 95: 443–448. https://doi.org/10.1007/s00114-007-0341-0
  • Klug S, Kriwet J (2013) An offshore fish assemblage (Elasmobranchii, Actinopterygii) from the Late Jurassic of NE Spain. Paläontologische Zeitschrift 87: 235–257. https://doi.org/10.1007/s12542-012-0156-y
  • Klug S, Kriwet J, Böttcher R, Schweigert G, Dietl G (2009) Skeletal anatomy of the extinct shark Paraorthacodus jurensis (Chondrichthyes; Palaeospinacidae), with comments on synechodontiform and palaeospinacid monophyly. Zoological Journal of the Linnean Society 157(1): 107–134. https://doi.org/10.1111/j.1096-3642.2009.00534.x
  • Kriwet J (2003) Neoselachian remains (Chondrichthyes, Elasmobranchii) from the Middle Jurassic of SW Germany and NW Poland. Acta Palaeontologica Polonica 48(4): 583–594. https://doi.org/10.5281/zenodo.13392318
  • Leidner A, Thies D (1999) Placoid scales and oral teeth of Late Jurassic elasmobranchs from Europe. In: Arratia G, Shultz H-P (Eds) Mesozoic fishes 2: 29–40.
  • Leuzinger L, Cuny G, Popov E, Billon-Bruyat J-P (2017) A new Chondrichthyan fauna from the Late Jurassic of the Swiss Jura (Kimmeridgian) dominated by hybodonts, chimaeroids and guitarfishes. Papers in Palaeontology 3(4): 471–511. https://doi.org/10.1002/spp2.1085
  • Mackie SJ (1863) On a new species of Hybodus from the lower chalk. The Geologist 6: 241–246. https://doi.org/10.1017/s1359465600001209
  • Maisey JG (2012) What Is an 'Elasmobranch'? The Impact of Palaeontology in Understanding Elasmobranch Phylogeny and Evolution. Journal of Fish Biology 80(5): 918–951. https://doi.org/10.1111/j.1095-8649.2012.03245.x
  • Maisey JG, Naylor GJP, Ward DJ (2004) Mesozoic elasmobranchs, neoselachian phylogeny and the rise of modern elasmobranch diversity. In: Arratia G, Tintori A (Eds) Mesozoic Fishes 3 – Systematics, Paleoenvironments and Biodiversity. Verlag Dr, Friedrich Pfeil, Munich, 17–56.
  • Mollen FH, Hovestadt DC (2018) A new partial skeleton of a palaeospinacid shark (Neoselachii, Synechodontiformes) from the Albian of northern France, with a review of the taxonomic history of Early Cretaceous species of Synechodus Woodward, 1888. Geodiversitas 40(25): 557–574. https://doi.org/10.5252/geodiversitas2018v40a25
  • Moss ML (1970) Enamel and bone in shark teeth: With a note on fibrous enamel in fishes. Acta anatomica 77: 161–187. https://doi.org/10.1159/000143540
  • Müller J, Henle FGJ (1841) Systematische Beschreibung der Plagiostomen: 200 pp. https://doi.org/10.5962/bhl.title.6906
  • Nelson JN (1984) Fishes of the world. Second Edition, New York, John Wiley and sons (Publishers), 523 pp.
  • Rees J (2010) Neoselachian sharks from the Callovian-Oxfordian (Jurassic) of Ogrodzieniec, Zawiercie Region, Southern Poland. Palaeontology 53(4): 887–902. https://doi.org/10.1111/j.1475-4983.2010.00967.x
  • Saugen SM, Roberts AJ, Engelschiøn VS, Hurum JH (2024) A new assemblage of Lower Triassic neoselachians (Chondrichthyes) from the Grippia Bonebed of Spitsbergen, Norway. Journal of Vertebrate Paleontology 44(3): e2426544. https://doi.org/10.1080/02724634.2024.2426544
  • Saint-Seine de P (1949) Les poissons des calcaires lithographiques de Cerin (Ain). Nouvelles Archives du Muséum d'Histoire Naturelle de Lyon 2: 1–357. https://doi.org/10.3406/mhnly.1949.984
  • Stumpf S, Kriwet J (2019) A new Pliensbachian elasmobranch (Vertebrata, Chondrichthyes) assemblage from Europe, and its contribution to the understanding of late Early Jurassic elasmobranch diversity and distributional patterns. Paläontologische Zeitschrift 93: 637–658. https://doi.org/10.1007/s12542-019-00451-4
  • Stumpf S, Türtscher J, López-Romero FA, Villalobos-Segura E, Begat A, Amadori M, Dearden RP, Lauer B, Lauer R, Hecker A, Kriwet J (in press) Reappraisal of the extinct barbelthroat shark †Bavariscyllium and the nebulous origin of carcharhiniform galeomorphs. Communications Biology.
  • Schweigert G (1998) Die Ammonitenfauna des Nusplinger Plattenkalks (Ober-Kimmeridgium, Beckeri-Zone, Ulmense-Subzone, Baden Württemberg). Stuttgarter Beiträge zur Naturkunde, B 267: 1–61.
  • Schweigert G (2007) Ammonite biostratigraphy as a tool for dating Upper Jurassic lithographic limestones from South Germany – first results and open questions. Neues Jahrbuch für Geologie und Paläontologie. Abhandlungen 245(1): 117–125. https://doi.org/10.1127/0077-7749/2007/0245-0117
  • Thies D (1983) Jurazeitliche Neoselachier aus Deutschland und S-England. Courier Forschunginstitut Senckenberg 58: 1–116.
  • Thies D (2005) A catshark (Neoselachii, Carcharhiniformes, Scyliorhinidae) from the Late Jurassic of Germany. Paläontologische Zeitschrift 79(3): 339–348. https://doi.org/10.1007/bf02991927
  • Thies D, Vespermann J, Solcher J (2014) Two new neoselachian sharks (Elasmobranchii, Neoselachii, Synechodontiformes) from the Rhaetian (Late Triassic) of Europe. Palaeontographica, Abt. A: Palaezoology – Stratigraphy 303(4–6): 137–167. https://doi.org/10.1127/pala/303/2014/137
  • Trautschold H (1877) Über Kreidefossilien Russlands. Bulletin De La Société Naturaliste De Moscou 52(1): 332–349.
  • Türtscher J, Jambura PL, López‐Romero FA, Kindlimann R, Sato K, Tomita T, Kriwet J (2022) Heterodonty and ontogenetic shift dynamics in the dentition of the tiger shark Galeocerdo cuvier (Chondrichthyes, Galeocerdidae). Journal of Anatomy 241(2): 372–392. https://doi.org/10.1111/joa.13668
  • Underwood CJ, Claeson KM (2019) The Late Jurassic ray Kimmerobatis etchesi gen. et sp. nov. and the Jurassic radiation of the Batoidea. Proceedings of the Geologists' Association 130(3–4): 345–354. https://doi.org/10.1016/j.pgeola.2017.06.009
  • Underwood CJ, Ward DJ (2004) Neoselachian sharks and rays from the British Bathonian (Middle Jurassic). Palaeontology 47(3): 447–501. https://doi.org/10.1111/j.0031-0239.2004.00386.x
  • Villalobos-Segura E, Stumpf S, Türtscher J, Jambura PL, Begat A, López-Romero FA, Fischer J, Kriwet J (2023) A Synoptic Review of the Cartilaginous Fishes (Chondrichthyes: Holocephali, Elasmobranchii) from the Upper Jurassic Konservat-Lagerstätten of Southern Germany: Taxonomy, Diversity, and Faunal Relationships. Diversity 15(3): 386. https://doi.org/10.3390/d15030386
  • Villalobos-Segura E, Amadori M, Stumpf S, Jambura PL, Begat A, López-Romero FA, Schweigert G, Maxwell EE, Kriwet J (2025) Articulated specimens provide new insights into the iconic Mesozoic shark genus Sphenodus. Journal of Systematic Palaeontology 23(1): 2507014. https://doi.org/10.1080/14772019.2025.2507014
  • Wagner JA (1857) Charakteristik neuer Arten von Knorpelfischen aus den lithographischen Schiefern der Umgegend von Solnhofen. Gelehrte Anzeigen der königlich bayerischen Akademie der Wissenschaften 44(35–36): 288–293.
  • Woodward AS (1888) On the Cretaceous selachian genus Synechodus. The Geological Magazine 3: 496–499. https://doi.org/10.1017/s0016756800182767
  • Woodward AS (1918) On two new elasmobranch fishes (Crossorhinus jurassicus sp. nov. and Protospinax annectans gen. et sp. nov.) from the Upper Jurassic lithographic stone of Bavaria. Proceedings of the Zoological Society of London 13: 231–235. https://doi.org/10.1111/j.1096-3642.1918.tb02093.x