dipleurulan.

/dʌɪˈplʊərjʊlə/

Etymology: modern Latin, diminutive of dipleura n.

A supposed bilaterally symmetrical ancestor of the echinoderms. Also, a stage in the development of some echinoderms.

ΚΠ

1896 H. M. Bernard & M. Bernard tr. A. Lang Text-bk. Compar. Anat. II. viii. 546 The radiate, but at the same time asymmetrical Echinoderm proceeds ontogenetically from a bilaterally symmetrical larva, the so-called Dipleurula.

1896 H. M. Bernard & M. Bernard tr. A. Lang Text-bk. Compar. Anat. II. viii. 547 (heading) Metamorphosis of the Dipleurula Larva.

1900 F. A. Bather et al. in Lankester Treat. Zool. iii. viii. 4 Zoologists have imagined a phylogenetic stage, the two-sided or Dipleurula stage,..more or less repeated in the Dipleurula larvae of recent Echinoderms.

1900 F. A. Bather et al. in Lankester Treat. Zool. iii. viii. 5 The simplest larval form among recent Echinoderms,..known as Auricularia,..differs from the Dipleurula in being bent upon its ventral surface.

1902 Encycl. Brit. XXVII. 620/1 We reach the conception that this supposed bilateral ancestor (or Dipleurula) may have become fixed.

1962 D. Nichols Echinoderms x. 121 It is not strange that early in life a common plan exists between those forms with larvae, or most of them. This stage has been termed the dipleurula (‘little two sides’), a word which has unhappily been used to denote also a hypothetical common ancestor to the entire phylum.

This entry has not yet been fully updated (first published 1933; most recently modified version published online March 2018).

单词	dipleurula
释义	dipleurulan. /dʌɪˈplʊərjʊlə/ Etymology: modern Latin, diminutive of dipleura n. A supposed bilaterally symmetrical ancestor of the echinoderms. Also, a stage in the development of some echinoderms. ΚΠ 1896 H. M. Bernard & M. Bernard tr. A. Lang Text-bk. Compar. Anat. II. viii. 546 The radiate, but at the same time asymmetrical Echinoderm proceeds ontogenetically from a bilaterally symmetrical larva, the so-called Dipleurula. 1896 H. M. Bernard & M. Bernard tr. A. Lang Text-bk. Compar. Anat. II. viii. 547 (heading) Metamorphosis of the Dipleurula Larva. 1900 F. A. Bather et al. in Lankester Treat. Zool. iii. viii. 4 Zoologists have imagined a phylogenetic stage, the two-sided or Dipleurula stage,..more or less repeated in the Dipleurula larvae of recent Echinoderms. 1900 F. A. Bather et al. in Lankester Treat. Zool. iii. viii. 5 The simplest larval form among recent Echinoderms,..known as Auricularia,..differs from the Dipleurula in being bent upon its ventral surface. 1902 Encycl. Brit. XXVII. 620/1 We reach the conception that this supposed bilateral ancestor (or Dipleurula) may have become fixed. 1962 D. Nichols Echinoderms x. 121 It is not strange that early in life a common plan exists between those forms with larvae, or most of them. This stage has been termed the dipleurula (‘little two sides’), a word which has unhappily been used to denote also a hypothetical common ancestor to the entire phylum. This entry has not yet been fully updated (first published 1933; most recently modified version published online March 2018). < n.1896
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