| 单词 |
siphunculus |
| 释义 |
‖ siˈphunculus Zool.
Pl. -culi.
[L. sīphunculus a little pipe, dim. of sīpho siphon.]
1. = siphuncle 1.
Anglicized as siphuncule by Mayne Expos. Lex. (1858).
1752J. Hill Hist. Anim. 121 A siphunculus carried the whole length of the shell [of the nautilus]. 1764Phil. Trans. LIV. 48 The siphunculus of the Belemnite is always upon the verge of the chamber, or cell. 1822J. Parkinson Outl. Oryctol. 164 The chambers divided by winding septa, pierced by a siphunculus always placed at the outer side. 1836Buckland Geol. & Min. xv. §3 (1837) I. 332 Families of fossil chambered shells, that possessed siphunculi.
2. Ent. A tubular appendage on the abdomen of aphids, which lets out a waxy substance when the animal is attacked that acts as an alarm pheromone; (formerly believed to be the tube from which honeydew comes). Usu. called a cornicle.
1939V. B. Wigglesworth Princ. Insect Physiol. x. 233 At the apex of the abdominal tubes or siphunculi of Aphids are ostioles..which allow wax-laden blood cells to escape. 1975Jrnl. Zool. CLXXV. 280 When prodded or attacked by parasites or predators aphids often exude these cells bathed in fluid from their siphunculi. |
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