Cephalopod associations and palaeoecology of the Cretaceous (Barremian–Cenomanian) succession of the Alpstein, northeastern Switzerland

Tajika, Amane; Kürsteiner, Peter; Pictet, Antoine; Lehmann, Jens; Tschanz, Karl; Jattiot, Romain; Klug, Christian

doi:10.1016/j.cretres.2016.09.010

Cited by 19 publications

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“…Tajika et al . (2017) showed that Cretaceous cephalopod associations of Switzerland, including heteromorphs (e.g. Emericiceras , Mariella ), are dominant in deep‐subtidal to offshore facies and rare to absent in shallower, carbonate facies.…”

Section: Habitat Reconstructionmentioning

confidence: 99%

“…The torticones Turrilitoides and Mariella as well as the hamiticones Anisoceras and Hamites are associated with offshore neritic and oceanic facies. Tajika et al (2017) showed that Cretaceous cephalopod associations of Switzerland, including heteromorphs (e.g. Emericiceras, Mariella), are dominant in deep-subtidal to offshore facies and rare to absent in shallower, carbonate facies.…”

Section: Habitat Reconstruction (1) Taphonomic Controls On Facies mentioning

confidence: 99%

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Recent advances in heteromorph ammonoid palaeobiology

et al. 2021

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Heteromorphs are ammonoids forming a conch with detached whorls (open coiling) or non‐planispiral coiling. Such aberrant forms appeared convergently four times within this extinct group of cephalopods. Since Wiedmann's seminal paper in this journal, the palaeobiology of heteromorphs has advanced substantially. Combining direct evidence from their fossil record, indirect insights from phylogenetic bracketing, and physical as well as virtual models, we reach an improved understanding of heteromorph ammonoid palaeobiology. Their anatomy, buoyancy, locomotion, predators, diet, palaeoecology, and extinction are discussed. Based on phylogenetic bracketing with nautiloids and coleoids, heteromorphs like other ammonoids had 10 arms, a well‐developed brain, lens eyes, a buccal mass with a radula and a smaller upper as well as a larger lower jaw, and ammonia in their soft tissue. Heteromorphs likely lacked arm suckers, hooks, tentacles, a hood, and an ink sac. All Cretaceous heteromorphs share an aptychus‐type lower jaw with a lamellar calcitic covering. Differences in radular tooth morphology and size in heteromorphs suggest a microphagous diet. Stomach contents of heteromorphs comprise planktic crustaceans, gastropods, and crinoids, suggesting a zooplanktic diet. Forms with a U‐shaped body chamber (ancylocone) are regarded as suspension feeders, whereas orthoconic forms additionally might have consumed benthic prey. Heteromorphs could achieve near‐neutral buoyancy regardless of conch shape or ontogeny. Orthoconic heteromorphs likely had a vertical orientation, whereas ancylocone heteromorphs had a near‐horizontal aperture pointing upwards. Heteromorphs with a U‐shaped body chamber are more stable hydrodynamically than modern Nautilus and were unable substantially to modify their orientation by active locomotion, i.e. they had no or limited access to benthic prey at adulthood. Pathologies reported for heteromorphs were likely inflicted by crustaceans, fish, marine reptiles, and other cephalopods. Pathologies on Ptychoceras corroborates an external shell and rejects the endocochleate hypothesis. Devonian, Triassic, and Jurassic heteromorphs had a preference for deep‐subtidal to offshore facies but are rare in shallow‐subtidal, slope, and bathyal facies. Early Cretaceous heteromorphs preferred deep‐subtidal to bathyal facies. Late Cretaceous heteromorphs are common in shallow‐subtidal to offshore facies. Oxygen isotope data suggest rapid growth and a demersal habitat for adult Discoscaphites and Baculites. A benthic embryonic stage, planktic hatchlings, and a habitat change after one whorl is proposed for Hoploscaphites. Carbon isotope data indicate that some Baculites lived throughout their lives at cold seeps. Adaptation to a planktic life habit potentially drove selection towards smaller hatchlings, implying high fecundity and an ecological role of the hatchlings as micro‐ and mesoplankton. The Chicxulub impact at the Cretaceous/Paleogene (K/Pg) boundary 66 million years ago is the likely trigger for the extinct...

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Section: Habitat Reconstructionmentioning

confidence: 99%

Section: Habitat Reconstruction (1) Taphonomic Controls On Facies mentioning

confidence: 99%

Recent advances in heteromorph ammonoid palaeobiology

et al. 2021

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“…In the fossil record, recognition of isolated soft parts of ectocochleate cephalopods is hampered by the scarcity of soft tissue preservation in general. Hence, usually only the hard parts are recognised (e.g., Sharifi et al, 2021;Tajika et al, 2017;Wilmsen & Yazykova, 2003;Wittler et al, 1999). In the case of isolated jaws, it cannot be ruled out that soft parts were present, which then were either eaten by scavengers or were decaying otherwise (Clements et al, 2016).…”

Section: Taphonomical Historymentioning

confidence: 99%

Preservation of nautilid soft parts inside and outside the conch interpreted as central nervous system, eyes, and renal concrements from the Lebanese Cenomanian

et al. 2021

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Nautilid, coleoid and ammonite cephalopods preserving jaws and soft tissue remains are moderately common in the extremely fossiliferous Konservat-Lagerstätte of the Hadjoula, Haqel and Sahel Aalma region, Lebanon. We assume that hundreds of cephalopod fossils from this region with soft-tissues lie in collections worldwide. Here, we describe two specimens of Syrionautilus libanoticus (Cymatoceratidae, Nautilida, Cephalopoda) from the Cenomanian of Hadjoula. Both specimens preserve soft parts, but only one shows an imprint of the conch. The specimen without conch displays a lot of anatomical detail. We homologise the fossilised structures as remains of the digestive tract, the central nervous system, the eyes, and the mantle. Small phosphatic structures in the middle of the body chamber of the specimen with conch are tentatively interpreted as renal concrements (uroliths). The absence of any trace of arms and the hood of the specimen lacking its conch is tentatively interpreted as an indication that this is another leftover fall (pabulite), where a predator lost parts of its prey. Other interpretations such as incomplete scavenging are also conceivable.

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“…The chronostratigraphic range of Eutrephoceras extends from the Upper Jurassic to the Miocene (Kummel, 1956;Landman et al, 2018). Most of the mid-Cretaceous occurrences of this taxon were recorded from European Albian and Cenomanian successions (Ayoub-Hannaa et al, 2018;Jattiot et al, 2021;Kennedy et al, 2008;Machalski & Wilmsen, 2015;Tajika et al, 2017;Wilmsen, 2000Wilmsen, , 2016. The Koppeh Dagh Basin (northeastern Iran), in which the lower Albian to middle Cenomanian sedimentary rocks are exposed as Aitamir Formation, is known for its rich assemblage of diverse macro-and microfossils, but no nautilid fossils have been documented thus far.…”

Section: Introductionmentioning

confidence: 99%

First discovery of nautilids from the Albian–Cenomanian succession of the Koppeh Dagh Basin, NE Iran

et al. 2021

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The Aitamir Formation, situated in the Koppeh Dagh Basin in the northeast of Iran, is known for its well-exposed Albian-to-Cenomanian succession. Although geologists previously documented a number of macro- and microfossils, no nautilids had been discovered until now to our knowledge. Here, we present lower Albian and middle Cenomanian nautilids from the Koppeh Dagh Basin for the first time. This discovery is also the first record of Cretaceous nautilids from Iran. We identified the specimens as Eutrephoceras clementianum (d’Orbigny 1840), E. sublaevigatum (d’Orbigny 1850), E. bouchardianum (d’Orbigny 1840) and Eutrephoceras sp. These specimens occur in horizons situated between several ammonite-bearing levels, which allowed us to more precisely constrain age estimates for the recovered nautilid specimens. E. clementianum could not be dated precisely but likely comes from between late Aptian ammonite index Hypacanthoplites uhligi and middle Albian Hoplites (Hoplites) baylei. E. sublaevigatum occurs just above the late Albian ammonites Mariella bergeri and Semenoviceras michalskii and below the Mantelliceras mantelli Zone. At the upper part of the section, E. bouchardianum and Eutrephoceras sp. were collected from lower Albian beds, which correspond to the Mantelliceras mantelli and Mantelliceras dixonii zones. These new findings contribute to our knowledge of the geographical distribution and stratigraphic range of Albian–Cenomanian nautilid species.

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Cephalopod associations and palaeoecology of the Cretaceous (Barremian–Cenomanian) succession of the Alpstein, northeastern Switzerland

Cited by 19 publications

References 50 publications

Recent advances in heteromorph ammonoid palaeobiology

Recent advances in heteromorph ammonoid palaeobiology

Preservation of nautilid soft parts inside and outside the conch interpreted as central nervous system, eyes, and renal concrements from the Lebanese Cenomanian

First discovery of nautilids from the Albian–Cenomanian succession of the Koppeh Dagh Basin, NE Iran

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