Tom Linn's scientific contributions
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Publications (4)
The magnitude and ontogenetic patterns of intraspecific variation can provide important insights into the evolution and development of organisms. Understanding the intraspecific variation of organisms is also a key to correctly pursuing studies in major fields of palaeontology. However, intraspecific variation has been largely overlooked in ectococ...
Scaphitid ammonoids were ubiquitous and significant components of the Western Interior Seaway during the Late Cretaceous. This group is characterized by a recurved hook at maturity that deviates from the juvenile whorls. Such a modification seems counterproductive to active locomotion and to manage a biologically effective orientation that facilita...
The seemingly aberrant coiling of heteromorphic ammonoids suggests that they underwent more significant changes in hydrostatic properties throughout ontogeny than their planispiral counterparts. Such changes may have been responses to different selective pressures at different life stages. The hydrostatic properties of three species of Didymoceras...
Citations
... Cephalopod conch shape (referring to the entire shell geometry) influences various syn vivo physical properties and functional constraints (Fig. 1). A conch's external shape constrains how the living animal interacts with surrounding water during locomotion (i.e., drag, lift, etc.;Trueman 1940;Denton 1974;Chamberlain 1976Chamberlain , 1981Chamberlain , 1993Jacobs 1992;Jacobs et al. 1994;Jacobs and Chamberlain 1996;Hebdon et al. 2020Hebdon et al. , 2021Peterman, Hebdon, et al. 2020;Peterman, Shell, et al. 2020;, while internal morphology and coiling parameters influence hydrostatics (i.e., buoyancy, stability, directional efficiency of movement; Fig. 1C; Saunders and Shapiro 1986;Hoffmann et al. 2015 Barton, et al. 2019;Peterman, Mikami, et al. 2020;Morón-Alfonso et al. 2021;Peterman et al. 2021;. Nautilids -the only living cephalopods with chambered, external conchs -are frequently used as models for the swimming capabilities and function of extinct taxa. ...
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... These parameters were used to calculate the whorl expansion rate [(dm 1 /dm 2 ) 2 ; WER], whorl width index (ww/dm; WWI), whorl height, and siphuncle position index (vd/ wh; SPI). For details of these morphological parameters, see Tajika and Klug [25], and Tajika et al. [33]. Direct comparisons between WER, WWI, and the isotope values are difficult because they require estimation of the position of the aperture at the time of septal formation. ...
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... Sometimes this requires reconstruction and/or retrodeformation while a DOP is virtual (VDOP) (Srivastava and Shah, 2006;Molnar et al., 2012;Tallman et al., 2014;Johnson et al., 2017;Pohle and Klug, 2018;Schlager et al., 2018). Investigators can mitigate taphonomic distortion by assuming symmetry to complete a partial specimen (Schlager et al., 2018), using modern analogs as guides (Molnar et al., 2012;Tallman et al., 2014), forming composites from multiple individuals (Ibrahim et al., 2014;Peterman et al., 2020b), or reconstructing morphologies mathematically (Raup, 1967;Peterman et al., 2020a;Peterman et al., 2020c;Moron Alfonso et al., 2020;Chirat et al., 2021). ...
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... Among Cretaceous heteromorphs, palaeopathologies are common and have been mostly reported for scaphitids (Landman & Waage, 1986;Hengsbach, 1996;Larson, 2002;Landman et al., 2010bLandman et al., , 2012aLandman et al., , 2019Keupp, 2012; Hoffmann & Keupp, 2015). Typically, injuries affected the margin of temporary apertures and usually occur in early ontogenetic stages (coiled conch part). ...
