Evolution of biological complexity and its relation to taxonomic longevity in the Ammonoidea

Boyajian, George E.; Lutz, Tim

doi:10.1130/0091-7613(1992)020<0983:eobcai>2.3.co;2

Cited by 78 publications

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“…The increasing suture indentation (frilling) is also a common pattern of ammonoid evolution, especially at large taxonomic ranks (Boyajian & Lutz 1992;Saunders et al 1999;Allen 2006). The classical morphofunctional interpretation (often called the Buckland hypothesis) is that increasing suture indentation leads to forms adapted to deeper water depth, because it is supposed to provide buttressing against hydrostatic pressure on the phragmocone (Buckland 1836;Pfaff 1911;Saunders 1995;De Blasio 2008;and references inside).…”

Section: Discussionmentioning

confidence: 99%

Globacrochordicerasgen. nov. (Acrochordiceratidae, late Early Triassic) and its significance for stress-induced evolutionary jumps in ammonoid lineages (cephalopods)

Monnet¹,

Bucher

Brayard

et al. 2013

Fossil Record

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Section: Discussionmentioning

confidence: 99%

Globacrochordicerasgen. nov. (Acrochordiceratidae, late Early Triassic) and its significance for stress-induced evolutionary jumps in ammonoid lineages (cephalopods)

Monnet¹,

Bucher

Brayard

et al. 2013

Fossil Record

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“…The debate regarding the "ammonoid suture problem" has been based on the following indices that represent the geometric properties of the suture line: Index of Suture Complexity (Westermann, 1971;Ward, 1980;Ballantine, 2007), Intersutural Span (Jacobs, 1990), Sutural Amplitude Index (Batt, 1991), Sutural Complexity Index (Saunders, 1995;Saunders andWork, 1996, 1997;Saunders et al, 1999) and fractal dimension (García-Ruiz et al, 1990;Boyajian and Lutz, 1992;Lutz and Boyajian, 1995;Olóriz and Palmqvist, 1995;Checa and García-Ruiz, 1996;Olóriz et al, 1997Olóriz et al, , 2002Pérez-Claros et al, 2002, among others. However, these indices are somewhat ambiguous because disparate suture forms are commonly represented by similar index values (Allen, 2006).…”

Section: Introductionmentioning

confidence: 99%

Wavelet analysis of ammonoid sutures

Ubukata

Tanabe

Shigeta

et al. 2014

Palaeontologia Electronica

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A morphometric method based on a continuous wavelet transform is introduced for describing the form of ammonoid suture lines. A series of y-coordinate data along the suture line placed in a common reference system was used as the descriptor function of the cumulative chordal length along the suture line. The wavelet transform is defined as an inner product between the descriptor function and a finite-length localized waveform, termed a "daughter wavelet." The absolute values of wavelet transforms, or amplitudes, were computed for individual daughter wavelets with various wavelengths and positions, and a series of amplitudes for different frequencies was used as a shape function in characterizing the suture shape and was summarized into a few principal components.

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“…Results ofthe minimum test are equivocal. Minimum complexity increased somewhat for ammonoids as a whole in the diversification leading up to the endPermian mass extinction (Boyajian and Lutz 1992) but decreased somewhat in the diversification that followed. Also , the minimum decreased in a number oflower taxa (orders) (Boyajian pers .…”

mentioning

confidence: 98%

“…Jablonski (1987) used the minimum test to distinguish passive from driven increases in size in Cretaceous bivalves and gastropods. Boyajian and Lutz (1992) used this test to investigate the mechanism of change for a trend in the complexity of ammonoid sutures. has not, to my knowledge, been proposed for any real large-scale trend.…”

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confidence: 99%

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1994

Evolution

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Abstract. -Large-scale evolutionary trends may result from driving forces or from passive diffusion in bounded spaces. Such trends are persistent directional changes in higher taxa spanning significant periods of geological time; examples include the frequently cited long-term trends in size, complexity, and fitness in life as a whole, as well as trends in lesser supraspecific taxa and trends in space. In a driven trend, the distribution mean increases on account ofa force (which may manifest itself as a bias in the direction of change) that acts on lineages throughout the space in which diversification occurs. In a passive system, no pervasive force or bias exists, but the mean increases because change in one direction is blocked by a boundary, or other inhomogeneity, in some limited region of the space. Two tests have been used to distinguish these trend mechanisms: (1) the test based on the behavior ofthe minimum; and (2) the ancestor-descendant test, based on comparisons in a random sample of ancestor-descendant pairs that lie far from any possible lower bound. For skewed distributions, a third test is introduced here: (3) the subclade test, based on the mean skewness of a sample of subclades drawn from the tail of a terminal distribution. With certain restrictions, a system is driven if the minimum increases, if increases significantly outnumber decreases among ancestor-descendant pairs, and if the mean skew of subclades is significantly positive. A passive mechanism is more difficult to demonstrate but is the more likely mechanism if decreases outnumber increases and if the mean skew of subclades is negative. Unlike the other tests, the subclade test requires no detailed phylogeny or paleontological time series, but only terminal (e.g., modern) distributions. Monte Carlo simulations ofthe diversification ofa clade are used to show how the subclade test works. In the empirical cases examined, the three tests gave concordant results, suggesting first, that they work, and second, that the passive and driven mechanisms may correspond to natural categories of causes of large-scale trends.

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Evolution of biological complexity and its relation to taxonomic longevity in the Ammonoidea

Cited by 78 publications

References 0 publications

Globacrochordicerasgen. nov. (Acrochordiceratidae, late Early Triassic) and its significance for stress-induced evolutionary jumps in ammonoid lineages (cephalopods)

Globacrochordicerasgen. nov. (Acrochordiceratidae, late Early Triassic) and its significance for stress-induced evolutionary jumps in ammonoid lineages (cephalopods)

Wavelet analysis of ammonoid sutures

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