1963
DOI: 10.1002/jmor.1051120303
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Geometrical form and gnomonic growth in the bivalved Mollusca

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Cited by 38 publications
(29 citation statements)
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“…The similarity of angles α' in adult individuals of pearl mussels and their glochidia confirms the justifi cation of the previously described regularities of growth of Bivalvia (Thompson, 1945;Stasek, 1963;Wilbur and Owen, 1964;Alimov, 1967;Kafanov, 1975). Nevertheless, according to our results, there are intraspecific differences with respect to this character.…”
Section: Discussionsupporting
confidence: 86%
See 1 more Smart Citation
“…The similarity of angles α' in adult individuals of pearl mussels and their glochidia confirms the justifi cation of the previously described regularities of growth of Bivalvia (Thompson, 1945;Stasek, 1963;Wilbur and Owen, 1964;Alimov, 1967;Kafanov, 1975). Nevertheless, according to our results, there are intraspecific differences with respect to this character.…”
Section: Discussionsupporting
confidence: 86%
“…It is considered that the growth of shells corre sponds to a logarithmic (isogonal) spiral that is char acterized by a constant angle between a tangent drawn to any point of the spiral and the polar radius. It was noted that, for different species, the values of constant angles, hence, the form of spirals, are different (Thompson, 1945;Stasek, 1963;Wilbur and Owen, 1964;Alimov, 1967;Kafanov, 1975). The hypothesis of the species specifics of the values of the constant angle of the logarithmic spiral compared by the comparatory method became the basis for constructing a new taxo nomic system of mollusks (Logvinenko and Sta robogatov, 1971;Starobogatov and Tolstikova, 1986;Shikov and Zatravkin, 1991;Starobogatov et al, 2004).…”
mentioning
confidence: 99%
“…Such increments are termed 'gnomons' (Stasek, 1963), the differences between successive gnomons suggesting change in shell shape with age. Growth lines originate dorsally at progressively more posterior points along the ligament, run around the posterior margin of the shell, and eventually converge between and below the umbones, forming a structure known as the lunule, which in old animals may become extremely broad.…”
Section: Allometrymentioning
confidence: 99%
“…Steinmann (1907) felt that the escutcheon in trigoniids was sufficiently distinct to warrant a special term, the feldchen. However, structurally the escutcheon of the trigoniids is exactly comparable to that of other bivalves, and the term is hence unnecessary.…”
Section: T H E E S C U T C H E O N and C O R C E L E T Historymentioning
confidence: 99%