Geometric Measurement Analysis Versus Fourier Series Analysis for Shape Characterization Using the Gastropod Shell (Trivia) as an Example

Dommergues, Elisabeth; Dommergues, Jean‐Louis; Magniez, F.; Neige, Pascal; Verrecchia, Éric P.

doi:10.1023/b:matg.0000007785.96748.62

Cited by 20 publications

(15 citation statements)

References 10 publications

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“…Outlines were used as input for an EFA (Elliptic Fourier Analysis; Dommergues et al, 2003;Baylac & Friess, 2005). The five landmarks were used as control points to rotate the outlines into the same orientation.…”

Section: Fourier Analysismentioning

confidence: 99%

Cryptic species in Gemmuloborsonia (Gastropoda: Conoidea)

Puillandre¹,

Cruaud²,

Kantor³

2009

Journal of Molluscan Studies

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During a broad molecular taxonomic and phylogenetic survey of the gastropod superfamily Conoidea, 80 specimens of several species of the genus Gemmuloborsonia were sequenced for the cytochrome c oxidase subunit I gene. The genus, originally established for fossil species from the Plio-Pleistocene of the Philippines, now includes living species from bathyal depths of the Indo-Pacific Oceans. The molecular data demonstrated the presence of five separate entities, while only four 'morphospecies' could be isolated by visual examination. The two largest groups, representing separate species from the molecular data, were impossible to distinguish with certainty using shell or anatomical characters. To examine shell morphology in more detail the shape of the last whorl was analysed by Fourier analysis, and the Fourier coordinates were used in canonical variate analysis. The majority of the specimens were separated into two groups, but 21.6% of the specimens were impossible to distinguish by morphological characters. One of these two forms was attributed to the known species Gemmuloborsonia moosai Sysoev & Bouchet, 1996, while the other is described as a new species Gemmuloborsonia clandestina. Bathytoma colorata Sysoev & Bouchet, 2001 is transferred to Gemmuloborsonia on the basis of molecular analysis and radular morphology. Another species, represented in our material by a single specimen, remains undescribed.

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Section: Fourier Analysismentioning

confidence: 99%

Cryptic species in Gemmuloborsonia (Gastropoda: Conoidea)

Puillandre¹,

Cruaud²,

Kantor³

2009

Journal of Molluscan Studies

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“…Multiple samples can be analyzed quantitatively over a short period of time with limited intervention, allowing quantitative analyses to produce reliable results. Diverse effi cient methods have been developed to describe and quantify natural objects in geosciences, such as gastropod shells (Dommergues et al, 2003) and detrital sediments (Drolon et al, 2003). Qualitative data describing volcanic ash also need to be expressed quantitatively, which requires supplementary methods including statistical analysis and artifi cial intelligence.…”

Section: Microscopy Analysis Of Volcanic Ashmentioning

confidence: 99%

Quantitative scanning-electron microscope analysis of volcanic ash surfaces: Application to the 1982-1983 Galunggung eruption (Indonesia)

Ersoy¹,

Gourgaud²,

Aydar³

et al. 2007

Geological Society of America Bulletin

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Qualitative analyses of volcanic ash are time-consuming and subjective, whereas quantitative analyses are methodical and automated. Not only volcanic ash particles, but also many natural particles have been widely described and quantifi ed by their outlines. The qualitative data of volcanic ash surfaces need to be expressed quantitatively, supported by supplementary methods such as statistical analysis and artifi cial intelligence. Well-defi ned surface descriptors can be applied to volcanic ash particles. In this study, roughness and texture descriptors of pyroclastic material from the 1982-1983 eruption of Galunggung (Java, Indonesia) were used to describe the vesicle surfaces of the particles, alteration intensity, and/or fi ne particle abundance. These parameters are important for distinguishing the products of magmatic eruptions from those of phreatomagmatic eruptions. Further application of this method may allow these descriptors to be easily converted to alteration grade, vesicularity index, intensity of the fragmentation mechanism, and relative proportions of the pyroclast types. Hence, discrimination between products of different fragmentation mechanisms may permit forecasting of volcanic hazards.

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“…Moreover, significant advances in morphometric analysis have occurred in the last two decades, offering more efficient and powerful techniques, such as image analysis (Cadrin and Friedland, 1999) and geometric morphometrics methods (Rohlf and Marcus, 1993) for detecting differences among groups. For example, some studies use mollusks' shell shape to differentiate between species of similar shape (Ferson et al, 1985;Innes and Bates, 1999;Dommergues et al, 2003;Aguirre et al, 2006;Rufino et al, 2006;Costa et al, 2008a,b) or to analyse intra-specific variation along a wide geographical range (Palmer et al, 2004;Krapivka et al, 2007).…”

Section: Introductionmentioning

confidence: 99%