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Article: The Muensterelloidea: phylogeny and character evolution of Mesozoic stem octopods

Papers in Palaeontology - Volume 6 Issue 1 - Cover
Publication: Palaeontology
Volume: 6
Part: 1
Publication Date: Febuary 2020
Page(s): 31 92
Author(s): Dirk Fuchs, Yasuhiro Iba, Alexander Heyng, Masaya Iijima, Christian Klug, Neal L. Larson, and Günter Schweigert
DOI: 10.1002/spp2.1254
Addition Information

How to Cite

FUCHS, D., IBA, Y., HEYNG, A., IIJIMA, M., KLUG, C., LARSON, N.L., SCHWEIGERT, G. 2020. . Papers in Palaeontology, 6, 1, 31-92. DOI: /doi/10.1002/spp2.1254

Author Information

  • Dirk Fuchs - SNSB‐Bayerische Staatssammlung für Paläontologie und Geologie Richard‐Wagner‐Str. 10 80333 Munich Germany
  • Yasuhiro Iba - Earth & Planetary System Science Department of Natural History Sciences Hokkaido University Sapporo 060‐0810 Japan
  • Alexander Heyng - SNSB‐Bayerische Staatssammlung für Paläontologie und Geologie Richard‐Wagner‐Str. 10 80333 Munich Germany
  • Masaya Iijima - Earth & Planetary System Science Department of Natural History Sciences Hokkaido University Sapporo 060‐0810 Japan
  • Christian Klug - Paläontologisches Institut und Museum Universität Zürich Karl Schmid‐Strasse 4 8006 Zurich Switzerland
  • Neal L. Larson - Larson Paleontology Unlimited 12799 Wolframite Rd, Keystone, SD 57751 USA
  • Günter Schweigert - Staatliches Museum für Naturkunde Rosenstein 1 70191 Stuttgart Germany

Publication History

  • Issue published online: 28 January 2020
  • Manuscript Accepted: 02 November 2018
  • Manuscript Received: 20 June 2018

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Abstract

The Muensterelloidea is a superfamily of teudopseid octobrachians with a posteriorly patella‐shaped gladius. A morphometric comparison based on 148 muensterelloid gladii has yielded five new species accommodated in three new genera: Engeseriteuthis arcuatus gen. et sp. nov., Muensterella jillae sp. nov., Muensterella spinosa sp. nov., Tyrionella fauseri gen. et sp. nov. and Muensterellina johnjagti gen. et sp. nov. Cretaceous taxa ‘Tusoteuthiscobbani and ‘Muensterellatonii are re‐combined and placed within the genus Enchoteuthis. We introduce categories for gladius proportions applicable for both muensterelloid and non‐muensterelloid octobrachian gladii. A 2D‐landmark analysis including 64 muensterelloid and non‐muensterelloid gladii statistically confirms that the Muensterelloidea possess the smallest median field sizes of all Mesozoic gladii. We consider the lateral field‐dominated ‘gladius’ of the family Patelloctopodidae (Patelloctopus, Pearceiteuthis) to be vestigial (i.e. shorter than the mantle length) suggesting that the Patelloctopodidae are the last shared ancestors of incirrate and cirrate octopods. According to a phylogenetic analysis based on 31 gladius characters, the Muensterelloidea mainly consists of the ‘Muensterella‐Enchoteuthidae’ and the ‘patelloctopodid’ clade. Ancestral character state reconstructions suggest that an increasing posterior growth front is accompanied by a continuous decrease of the median field length. This milestone in the evolution of the octopod gladius vestige occurred between the Early and Middle Jurassic. The benthic life style of incirrate octopods (including Cretaceous palaeoctopodids) was adopted by Jurassic Patelloctopodidae, which arose from nectonic to nectobenthic teudopseid ancestors. There is currently no evidence to suggest a pelagic origin for benthic octopods.

Acknowledgements

Many thanks go to the referees Martin Košťák and V. A. Bizikov, whose thorough review distinctly improved our manuscript. Daniel Fauser (Schwäbisch Gmünd) kindly provided the holotype of Tyrionella. High resolution images provided by Ann Molineux (Austin), David Martill (Portsmouth) and Zoe Hughes (London) were of great help.

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