The Muensterelloidea: phylogeny and character evolution of Mesozoic stem octopods

DIRK FUCHS; Yasuhiro Iba; Alexander Heyng; Masaya Iijima; Christian Klug; Neal L. Larson; Günter Schweigert

doi:10.1002/spp2.1254

journal article Jun 28, 2019

The Muensterelloidea: phylogeny and character evolution of Mesozoic stem octopods

DIRK FUCHS

Yasuhiro Iba Alexander Heyng Masaya Iijima Christian Klug

Neal L. Larson Günter Schweigert

Papers in Palaeontology Vol. 6 No. 1 pp. 31-92 · Wiley

View at Publisher Save 10.1002/spp2.1254

Abstract

AbstractThe 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 arcuatusgen. et sp. nov.,Muensterella jillaesp. nov.,Muensterella spinosasp. nov.,Tyrionella fauserigen. et sp. nov. andMuensterellina johnjagtigen. et sp. nov. Cretaceous taxa ‘Tusoteuthis’cobbaniand ‘Muensterella’toniiare re‐combined and placed within the genusEnchoteuthis. 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.

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Details

Published: Jun 28, 2019
Vol/Issue: 6(1)
Pages: 31-92
License: View

Authors

D

DIRK FUCHS

SNSB‐Bayerische Staatssammlung für Paläontologie und Geologie Richard‐Wagner‐Str. 10 80333 Munich Germany

Y

Yasuhiro Iba

Earth & Planetary System Science Department of Natural History Sciences Hokkaido University Sapporo 060‐0810 Japan

A

Alexander Heyng

SNSB‐Bayerische Staatssammlung für Paläontologie und Geologie Richard‐Wagner‐Str. 10 80333 Munich Germany

M

Masaya Iijima

Earth & Planetary System Science Department of Natural History Sciences Hokkaido University Sapporo 060‐0810 Japan

C

Christian Klug

Paläontologisches Institut und Museum Universität Zürich Karl Schmid‐Strasse 4 8006 Zurich Switzerland

N

Neal L. Larson

Larson Paleontology Unlimited 12799 Wolframite Rd, Keystone, SD 57751 USA

G

Günter Schweigert

Staatliches Museum für Naturkunde Rosenstein 1 70191 Stuttgart Germany

Cite This Article

DIRK FUCHS, Yasuhiro Iba, Alexander Heyng, et al. (2019). The Muensterelloidea: phylogeny and character evolution of Mesozoic stem octopods. Papers in Palaeontology, 6(1), 31-92. https://doi.org/10.1002/spp2.1254

The Muensterelloidea: phylogeny and character evolution of Mesozoic stem octopods

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