Molecular structure of organic components in cephalopods: Evidence for oxidative cross linking in fossil marine invertebrates

Gupta, Neal S.; Briggs, Derek E. G.; Landman, Neil H.; Tanabe, Kazushige; Summons, Roger E.

doi:10.1016/j.orggeochem.2008.06.008

Cited by 45 publications

(42 citation statements)

References 35 publications

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“…Both lamellae are wholly composed of a black homogeneous material without any trace of calcification. We interpret that the lamellae were originally made of a chitin-protein complex as in those of modern cephalopod jaws (Saunders et al 1978;Hunt and Nixon 1981;Gupta et al 2008).…”

Section: Materials and Recognition Of Jaw Typementioning

confidence: 83%

“…19.1). The jaw apparatus of modern coleoid cephalopods is made of a darkly tinted, organic hard tissue composed of a chitin-protein complex (Saunders et al 1978;Hunt and Nixon 1981;Gupta et al 2008), whereas in nautilids (Nautilus and Allonautilus), calcareous tips developed on the chitinous lamellae of upper and lower jaws (Saunders et al 1978;Lowenstam et al 1984). Fossilized chitinous and calcareous remains of cephalopod jaws have been discovered from the Devonian and younger marine deposits (Tanabe and Fukuda 1999;Tanabe et al in press).…”

Section: Editors' Choicementioning

confidence: 99%

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Diversity, morphology, and phylogeny of coleoid cephalopods from the Upper Cretaceous Plattenkalks of Lebanon-Part I: Prototeuthidina

2011

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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 extraordinarily well-preserved, soft-part characters. An analysis of the Prototeuthidina, a gladius-bearing group with a slender torpedo-shaped body, revealed two species:Dorateuthis syriacaandBoreopeltis smithin. sp. Previously unknown soft-part characters, such as the digestive tract, the gills, and the cephalic cartilage considerably improved our knowledge ofD. syriaca.Since none of the investigated specimens show more than eight arms, similarities with modern squids are regarded as superficial.Boreopeltis smithin. sp. is erected on the basis of its comparatively wideParaplesioteuthis-like gladius. The latter species represents the first unambiguous record of this genus in Upper Cretaceous deposits. Phylogenetic analyses indicate that the prototeuthidid clade consists of two lineages. The plesioteuthidid lineage originates from early JurassicParaplesioteuthisand leads toPlesioteuthisandDorateuthis.The other lineage is morphologically more conservative and leads toBoreopeltis.

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Section: Materials and Recognition Of Jaw Typementioning

confidence: 83%

Section: Editors' Choicementioning

confidence: 99%

Diversity, morphology, and phylogeny of coleoid cephalopods from the Upper Cretaceous Plattenkalks of Lebanon-Part I: Prototeuthidina

2011

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“…10.3). They are largely darkly tinted, more or less flexible when the animal is alive, and composed mainly of a chitin-protein complex (Saunders et al 1978;Hunt and Nixon 1981;Lowenstam et al 1984;Gupta et al 2008). In nautilids ( Nautilus and Allonautilus), thick calcified deposits cover the chitinous lamellae of the upper and lower jaws in the anterior rostral portion (F ig.…”

Section: Buccal Mass Structures Of Modern Cephalopodsmentioning

confidence: 99%

Ammonoid Buccal Mass and Jaw Apparatus

Tanabe

Kruta

Landman

2015

Topics in Geobiology

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“…The upper jaw is composed of black material that was probably originally chitin (Gupta et al 2008). The lower jaw consists of two layers: an inner layer composed of black material and an outer layer composed of a pair of calcitic plates that together constitute the aptychi (or aptychus, depending on usage).…”

Section: Terminologymentioning

confidence: 99%

Description of the lower jaws of Baculites from the Upper Cretaceous U.S. Western Interior

Larson

Landman

2017

Acta Geologica Polonica

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We report the discovery of lower jaws of Baculites (Ammonoidea) from the Upper Cretaceous U.S. Western Interior. In the lower Campanian Smoky Hill Chalk Member of the Niobrara Chalk of Kansas, most of the jaws occur as isolated elements. Based on their age, they probably belong to Baculites sp. (smooth). They conform to the description of rugaptychus, and are ornamented with coarse rugae on their ventral side. One specimen is preserved inside a small fecal pellet that was probably produced by a fish. Another specimen occurs inside in a crushed body chamber near the aperture and is probably in situ. Three small structures are present immediately behind the jaw and may represent the remains of the gills. In the lower Maastrichtian Pierre Shale of Wyoming, two specimens of Baculites grandis contain lower jaws inside their body chambers, and are probably in situ. In both specimens, the jaws are oriented at an acute angle to the long axis of the shell, with their anterior ends pointing toward the dorsum. One of the jaws is folded into a U-shape, which probably approximates the shape of the jaw during life. Based on the measurements of the jaws and the shape of the shell, the jaws could not have touched the sides of the shell even if they were splayed out, implying that they could not have effectively served as opercula. Instead, in combination with the upper jaws and radula, they constituted the buccal apparatus that collected and conveyed food to the esophagus.

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Molecular structure of organic components in cephalopods: Evidence for oxidative cross linking in fossil marine invertebrates

Cited by 45 publications

References 35 publications

Diversity, morphology, and phylogeny of coleoid cephalopods from the Upper Cretaceous Plattenkalks of Lebanon-Part I: Prototeuthidina

Diversity, morphology, and phylogeny of coleoid cephalopods from the Upper Cretaceous Plattenkalks of Lebanon-Part I: Prototeuthidina

Ammonoid Buccal Mass and Jaw Apparatus

Description of the lower jaws of Baculites from the Upper Cretaceous U.S. Western Interior

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