First Middle–Late Jurassic gladius vestiges provide new evidence on the detailed origin of incirrate and cirrate octopuses (Coleoidea)

@article{Fuchs2018FirstMJ,
  title={First Middle–Late Jurassic gladius vestiges provide new evidence on the detailed origin of incirrate and cirrate octopuses (Coleoidea)},
  author={Dirk Fuchs and G{\"u}nter Schweigert},
  journal={PalZ},
  year={2018},
  volume={92},
  pages={203-217}
}
Limpet-like and non-mineralized fossils from the upper Kimmeridgian Nusplingen Plattenkalk are identified as internal shells of coleoid cephalopods, more specifically as octobrachian gladii. The significantly reduced median field provokes us to consider this new gladius type to be shorter than the mantle length. It is consequently seen as a vestigial gladius. The first recognition of an unpaired gladius vestige in the fossil record sheds new light on the evolutionary history of the gladius… 

The Muensterelloidea: phylogeny and character evolution of Mesozoic stem octopods

It is confirmed that the Muensterelloidea possess the smallest median field sizes of all Mesozoic gladii, a milestone in the evolution of the octopod gladius vestige occurred between the Early and Middle Jurassic.

Anatomy and evolution of the first Coleoidea in the Carboniferous

It is suggested that conch internalization happened rather suddenly including early growth stages while the ink sac evolved slightly later, as well as the timing of other important steps in early coleoid evolutionary.

References

SHOWING 1-10 OF 66 REFERENCES

A new peculiar muensterellid coleoid (Cephalopoda) from the Kimmeridge Clay Formation of Dorset (England)

  • D. Fuchs
  • Biology
    Proceedings of the Geologists' Association
  • 2019

Gladius shape variation in coleoid cephalopod Trachyteuthis from the Upper Jurassic Nusplingen and Solnhofen Plattenkalks

Morphometric analyses have shown that length−width indices are ambiguous characters to differentiate between the three species of Trachyteuthis hastiformis, which can be linked with the Early Jurassic genus Teudopsis and the Late Cretaceous genus Glyphiteuthis.

The first coleoid cephalopods from the Upper Cenomanian of Sicily (Italy) and their implications for the systematic-phylogenetic position of the Palaeololiginidae (Teudopseina)

Our knowledge about the evolutionary history of coleoid cephalopods is mainly based on a few evolutionary windows. In particular, palaeogeographical data is strongly limited; every new fossil

Diversity, Morphology, and Phylogeny of Coleoid Cephalopods from the Upper Cretaceous Plattenkalks of Lebanon–Part I: Prototeuthidina

Abstract Morphologic analyses of a large collection of coleoid cephalopods from the Lebanese Upper Cretaceous yielded a much higher diversity than previously assumed and revealed numerous

Diversity, Morphology, and Phylogeny of Coleoid Cephalopods from the Upper Cretaceous Plattenkalks of Lebanon–Part II: Teudopseina

A detailed comparison with Jurassic gladii shows that the Teudopseina is a very homogenous group that can be easily differentiated from other Mesozoic, gladius-bearing groups (Prototeuthidina, Loligosepiina).

The gladiuses in coleoid cephalopods: homology, parallelism, or convergence?

The present contribution reviews the “similarity” of the gladius, the chitinous shell rudiment in the dorsal mantle that provides rigid attachment sites for the locomotory-relevant musculature in living and Mesozoic gladius-bearing octobrachians.

Maastrichtian Ceratisepia and Mesozoic cuttlebone homeomorphs

Hewitt, R.A. & Jagt, J.W.M. 1999. Maastrichtian Ceratisepia and Mesozoic cuttlebone homeomorphs. - Acta Palaeontologica Polonica 44,3,305-326. The phylogenetics of potential Mesozoic ancestors of

First record of a belemnite preserved with beaks, arms and ink sac from the Nusplingen Lithographic Limestone (Kimmeridgian, SW Germany)

Klug, C., Schweigert, G., Fuchs, D. & Dietl, G. 2009: First record of a belemnite preserved with beaks, arms and ink sac from the Nusplingen Lithographic Limestone (Kimmeridgian, SW Germany).

On a Fossil Octopus (Calaïs Newboldi, J. De C. Sby. MS.) from the Cretaceous of the Lebanon

  • H. Woodward
  • Geology
    Quarterly Journal of the Geological Society of London
  • 1896
I am indebted to Mr. C. Davies Sherborn, F.G.S., for drawing my attention to a very remarkable and beautiful fossil from the Cretaceous formation of the Lebanon, Syria, obtained about 1846 by Lieut.

The locomotion system of Mesozoic Coleoidea (Cephalopoda) and its phylogenetic significance

A morphological comparison of shell-muscle contacts in coleoid cephalopods mainly from the Early Jurassic (Toarcian) Posidonia Shales of Holzmaden (Germany), the Middle Jurassic (Callovian) Oxford
...