planispiraladj.

Brit.

/ˌpleɪnᵻˈspʌɪrəl/,

/ˌpleɪnᵻˈspʌɪrl̩/, U.S.

/ˌpleɪnəˈspaɪr(ə)l/

Origin: Formed within English, by compounding. Etymons: plani- comb. form, spiral adj.¹ and adv.

Etymology: < plani- comb. form + spiral adj.¹ and adv. Compare scientific Latin planispira (1836 as specific name), and earlier planospiral adj.

Forming a flat coil; of or relating to a flat spiral form, as the shell of certain molluscs (including many fossil species), the proboscis of a butterfly or moth, etc.

ΘΚΠ

the world > animals > invertebrates > phylum Arthropoda > class Insecta > order Lepidoptera or butterflies and moths > [adjective] > of parts > of spiral form (of proboscis)

planospiral1847

planispiral1890

the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Gastropoda > [adjective] > belonging to order Pulmonifera > of or belonging to Inoperculata > of shells of genus Planorbis

planospiral1847

planispiral1890

flat-coiled1901

1890 Cent. Dict. Planispiral, coiled in one plane, like a watch-spring or flat spiral.

1932 Amer. Midland Naturalist 13 197 No evidence of a planispiral or a biserial stage is evident in any of the specimens examined.

1945 M. F. Glaessner Princ. Micropalaeontol. iv. 69 Perfectly planispiral coiling produces bilaterally symmetrical tests.

1986 G. Culverwell tr. P. Arduini & G. Teruzzi Macdonald Encycl. Fossils No. 104 This genus is characterized by a very flattened and involute planispiral shell, of typically platyoxycone form.

Derivatives

planiˈspirally adv.

ΚΠ

1932 Amer. Midland Naturalist 13 195 Chambers in early stages very small and planispirally coiled.

1993 E. N. K. Clarkson Invertebr. Palaeontol. & Evol. (ed. 3) viii. 194/1 The single univalved shell is coiled, planispirally or more often helically.

2001 A. V. Kouchinsky in A. Y. Zhuralev & R. Riding Ecol. Cambrian Radiation xv. 328 Planispirally coiled Latouchella-like and Bemella-like shells..are abundant and diverse in the lowermost lower Cambrian.

This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).

单词	planispiral
释义	planispiraladj. Brit. /ˌpleɪnᵻˈspʌɪrəl/, /ˌpleɪnᵻˈspʌɪrl̩/, U.S. /ˌpleɪnəˈspaɪr(ə)l/ Origin: Formed within English, by compounding. Etymons: plani- comb. form, spiral adj.¹ and adv. Etymology: < plani- comb. form + spiral adj.¹ and adv. Compare scientific Latin planispira (1836 as specific name), and earlier planospiral adj. Forming a flat coil; of or relating to a flat spiral form, as the shell of certain molluscs (including many fossil species), the proboscis of a butterfly or moth, etc. ΘΚΠ the world > animals > invertebrates > phylum Arthropoda > class Insecta > order Lepidoptera or butterflies and moths > [adjective] > of parts > of spiral form (of proboscis) planospiral1847 planispiral1890 the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Gastropoda > [adjective] > belonging to order Pulmonifera > of or belonging to Inoperculata > of shells of genus Planorbis planospiral1847 planispiral1890 flat-coiled1901 1890 Cent. Dict. Planispiral, coiled in one plane, like a watch-spring or flat spiral. 1932 Amer. Midland Naturalist 13 197 No evidence of a planispiral or a biserial stage is evident in any of the specimens examined. 1945 M. F. Glaessner Princ. Micropalaeontol. iv. 69 Perfectly planispiral coiling produces bilaterally symmetrical tests. 1986 G. Culverwell tr. P. Arduini & G. Teruzzi Macdonald Encycl. Fossils No. 104 This genus is characterized by a very flattened and involute planispiral shell, of typically platyoxycone form. Derivatives planiˈspirally adv. ΚΠ 1932 Amer. Midland Naturalist 13 195 Chambers in early stages very small and planispirally coiled. 1993 E. N. K. Clarkson Invertebr. Palaeontol. & Evol. (ed. 3) viii. 194/1 The single univalved shell is coiled, planispirally or more often helically. 2001 A. V. Kouchinsky in A. Y. Zhuralev & R. Riding Ecol. Cambrian Radiation xv. 328 Planispirally coiled Latouchella-like and Bemella-like shells..are abundant and diverse in the lowermost lower Cambrian. This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022). < adj.1890
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