biviumn.

/ˈbɪvɪəm/

Etymology: < Latin bivium a place where two ways meet; see bivious adj.

Physiology.

The two hinder ambulacra of Echinoderms.

ΘΚΠ

the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Echinodermata > [noun] > member of > parts of > ambulacrum > two posterior ambulacra

bivium1870

1870 G. Rolleston Forms Animal Life 142 To divide the five rays [in Asterias] into a ‘bivium’, between which the madreporic tubercle lies, and a ‘trivium’, the two lateral arms of which lie on either side of the arm which is opposite to that tubercle.

1877 T. H. Huxley Man. Anat. Invertebrated Animals ix. 570 It is possible in any of the Echinidea, to separate the three anterior ambulacra, as the trivium, from the two posterior, the bivium; and in the fossil genus Dysaster, this separation of the ambulacra into trivium and bivium exists naturally.

This entry has not yet been fully updated (first published 1887; most recently modified version published online June 2018).

单词	bivium
释义	biviumn. /ˈbɪvɪəm/ Etymology: < Latin bivium a place where two ways meet; see bivious adj. Physiology. The two hinder ambulacra of Echinoderms. ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Echinodermata > [noun] > member of > parts of > ambulacrum > two posterior ambulacra bivium1870 1870 G. Rolleston Forms Animal Life 142 To divide the five rays [in Asterias] into a ‘bivium’, between which the madreporic tubercle lies, and a ‘trivium’, the two lateral arms of which lie on either side of the arm which is opposite to that tubercle. 1877 T. H. Huxley Man. Anat. Invertebrated Animals ix. 570 It is possible in any of the Echinidea, to separate the three anterior ambulacra, as the trivium, from the two posterior, the bivium; and in the fossil genus Dysaster, this separation of the ambulacra into trivium and bivium exists naturally. This entry has not yet been fully updated (first published 1887; most recently modified version published online June 2018). < n.1870
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