Crystallographic texture determines mechanical properties of molluscan nacre

Frýda, Jiří; Šepitka, Josef; Frýdová, Barbora; Hrabánková, I.; Lukeš, Jaroslav; Klicnarová, M.

doi:10.1080/10255842.2013.815875

Cited by 3 publications

(1 citation statement)

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“…However, it should also be noted that Westermann's (, , ) calculations neglected some important aspects of the nautiloid shell such as the nacre structure, which differs considerably among nautiloids and affected the mechanical properties of the shell (Mutvei ; Frýda et al . ). We also point out that there are significant regional differences in body size between the contemporaneous late Emsian beds of the Jebel Ouaoufilal and Hamar Laghdad, with orthocones from the latter location being smaller.…”

Section: Discussionmentioning

confidence: 97%

Body size of orthoconic cephalopods from the late Silurian and Devonian of the Anti‐Atlas (Morocco)

Pohle

Klug

2018

LET

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Fluctuations in body size of orthoconic cephalopods are reported from late Silurian to Late Devonian sediments at several locations in the Tafilalt and in the Dra-Valley (Anti-Atlas, Morocco). The combination of measurements of diameters and apical angles allows the reconstruction of their total conch size (length and volume), which revealed a strongly right-skewed size distribution with an average length of 278 mm, while the largest Devonian actinocerids exceeded 2 m. Within the examined groups (Actinocerida, Orthocerida, Pseudorthocerida), there is no uniform trend, but rather frequent fluctuations with maximum sizes in the late Lochkovian and early Emsian. Body size decreased in times of extinction events, while stable periods are mostly associated with a size increase. Additionally, conch size correlates well with gamma diversity and global d 13 C values. Furthermore, the apical angle and septal diameter of orthocones appear to correlate, but only when their mean values are compared across beds. □ Anti-Atlas, body size, Cephalopoda, Devonian, extinction events, Morocco, orthocones. Alexander Pohle ✉ [alexander.pohle@pim.uzh.ch], and Christian Klug [chklug@pim.uzh.ch], Pal€ aontologisches Institut und Museum, Universit€ at Z€ urich, Karl-Schmid-Strasse 4, 8006 Z€ urich, Switzerland; manuscript received on 3/02/2017; manuscript accepted on 9/06/2017.

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