Rare representatives in the ammonoid fauna from Büdesheim (Cephalopoda, Eifel, Late Devonian) and the role of heterochrony

Korn, Dieter; Bockwinkel, Jürgen; Ebbighausen, Volker; Walton, Sonny A.

doi:10.1127/0077-7749/2013/0337

Cited by 7 publications

(8 citation statements)

References 25 publications

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“…While exact growth rates of ammonoids are unknown, some researchers have concluded that heterochrony (changes in the timing and rate of developmental traits during ontogeny) may play an important role in creating new species (Gould, 1977;Alberch et al, 1979;Landman and Geyssant, 1993;Yacobucci, 1999;Harada and Tanabe, 2005;Gangopadhyay and Bardhan, 2007;Korn et al, 2013). Alternatively, differing paleoecological factors during the existence of any species may account for a broad spectrum of morphological variation, which has been documented recently in several studies on extant and extinct mollusks; see Urdy et al (2010) and Wilmsen and Mosavinia (2011) for examples.…”

Section: Introductionmentioning

confidence: 99%

Geographic Information Systems technology as a morphometric tool for quantifying morphological variation in an ammonoid clade

Knauss

Yacobucci

2014

Palaeontologia Electronica

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Ammonoids are known for their intraspecific and interspecific morphological variation through ontogeny, particularly in shell shape and ornamentation. Many features covary and individual elements are difficult to homologize, which make qualitative descriptions and widely-used morphometric tools inappropriate for quantifying these complex morphologies. However, spatial analyses conducted in a geographic information systems (GIS) environment allow for quantification and visualization of global shell form. Here, we present a GIS-based methodology in which the variation of shell features is assessed to evaluate evolutionary patterns in an ammonoid clade from the Late Cretaceous Western Interior Seaway of North America. We investigate the ancestral and more variable scaphitid heteromorph ammonoid Hoploscaphites spedeni and its less variable descendant H. nebrascensis. We created three-dimensional (3D) digital models of the fossil shells' lateral surfaces using photogrammetric software and imported the reconstructions into a GIS environment. We used the number of discrete aspect patches and the surface-to-planimetric (3D to 2D) area ratios of the lateral surface as terrain roughness indices. These 3D spatial analyses demonstrate the overlapping morphological ranges of H. spedeni and H. nebrascensis in ornamentation despite differences in shell compression. Additionally, the target for evolutionary change in this clade resides in the macroconch body chamber, which becomes less variable through development from H. spedeni to subsequent H. nebrascensis in macroconchs; however, microconchs retain the ancestral variation through ontogeny. These geospatial analyses not only successfully quantified variation in complex morphologies, but also demonstrated the versatility of this method to address questions related to ontogeny and phylogeny.

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Section: Introductionmentioning

confidence: 99%

Geographic Information Systems technology as a morphometric tool for quantifying morphological variation in an ammonoid clade

Knauss

Yacobucci

2014

Palaeontologia Electronica

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“…For instance, crioconic, serpenticonic and platyconic forms coexisted with the highly involute auguritids and pinacitids (see Klug 2002;Korn and Klug 2003). Representatives with very complex and very simple suture lines were found together (e.g., Beloceras and Archoceras: Korn et al 2013b;Metoicoceras and Euomphaloceras;Cobban et al 1989). Micromorphic and large-sized ammonoids also co-occured (e.g., Nannometoicoceras and Metoicoceras; Kennedy 1989), and very involute and compressed forms coexisted with evolute and/or depressed forms (e.g., Oxylongobardites, Tropigastrites and Proarcestes; Monnet and Bucher 2005).…”

Section: Iterative Evolution and Evolutionary Jumpsmentioning

confidence: 96%

“…Hence, trends toward larger shell diameter have traditionally been interpreted to reflect persistent adaptive selection within long-ranging lineages. Trends toward smaller size, often interpreted by paedomorphosis, are also documented (e.g., Wright and Kennedy 1979;Kennedy and Wright 1985;Korn 1995b;Korn et al 2013b).…”

Section: Adaptation (Functional Constraints)mentioning

confidence: 97%

“…Collectively these are called heterochronoclines. Many examples of heterochronoclines have been described in ammonoids and for various characters and in various directions in their shell morphospace (e.g., Gould 1977;Dommergues et al 1986Landman 1988Landman , 1989Meister 1988;McNamara 1990;Dommergues 1990;Korn 1992Korn , 1995aKorn , 1995bLandman and Geyssant 1993;Gerber 2011;Korn et al 2013b;Fig. 5.4 Landman and Geyssant 1993) only developmental constraints play a significant role in ammonoid evolution, but also this role can be evaluated thanks to the accretionary mode of growth of mollusk shells, which provides an invaluable access to individual ontogenetic development in individual ammonoids.…”

Section: Developmental Constraints and Heterochronymentioning

confidence: 99%

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Evolutionary Patterns of Ammonoids: Phenotypic Trends, Convergence, and Parallel Evolution

Monnet

Klug

Baets

2015

Topics in Geobiology

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“…The event was two-phased, the first phase (lower Kellwasser Event) reduced the diversity to some degree, and the second (upper Kellwasser Event) brought most groups close to extinction (e.g., McGhee 1988;Buggisch 1991). Apart from the problematic archoceratids (suborder Gephuroceratina), of which the survival into the Famennian has been discussed (Korn et al 2013a), some lineages of the suborder Tornoceratina survived; they became the root stock from which subsequent ammonoids evolved (Becker 1995).…”

Section: Devonianmentioning

confidence: 99%

Taxonomic Diversity and Morphological Disparity of Paleozoic Ammonoids

Korn

Klug

Walton

2015

Topics in Geobiology

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The Ammonoidea are well represented in terms of numbers of species over a large range of time and they have survived many extinction events. The time interval from the Early Devonian through to the Triassic has seen ammonoid groups evolve and become extinct. The evolutionary history of the Paleozoic ammonoids was punctuated by some extinction events with near extinction events and subsequent recoveries. A Principal Components Analysis (PCA) based on the conch width index (CWI), umbilical width index (UWI) and whorl expansion rate (WER) parameters from 4834 ammonoid species of Devonian to Triassic age produced an empirical morphospace this time interval. The morphospace of Paleozoic ammonoids shows some subtle changes between the periods, but generally, the occupied area is remarkably similar.

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Rare representatives in the ammonoid fauna from Büdesheim (Cephalopoda, Eifel, Late Devonian) and the role of heterochrony

Cited by 7 publications

References 25 publications

Geographic Information Systems technology as a morphometric tool for quantifying morphological variation in an ammonoid clade

Geographic Information Systems technology as a morphometric tool for quantifying morphological variation in an ammonoid clade

Evolutionary Patterns of Ammonoids: Phenotypic Trends, Convergence, and Parallel Evolution

Taxonomic Diversity and Morphological Disparity of Paleozoic Ammonoids

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