| 单词 | sword-tail |
| 释义 | > as lemmassword-tail sword-tail n. an animal of the group Xiphosura, comprising only the genus Limulus; a king-crab. ΘΚΠ the world > animals > invertebrates > phylum Arthropoda > order Xiphosura or Merostomata > [noun] > member of xiphosure1837 sword-tail1858 xiphosuran1879 merostome1881 1858 W. Baird Cycl. Nat. Sci. Xiphosura,..Sword-tails. sword-tail sword-tail n. a small, live-bearing freshwater fish, Xiphophorus helleri (family Poeciliidae), of Central America, which is pale green in the wild but bred in many colour varieties in captivity, the male having an elongated lower lobe to the tail fin.The ‘sword’ that the Greek genus name of the fish refers to is the modified anal fin, not the projection of the tail fin found in X. helleri: see quot. 1931. ΚΠ 1905 D. S. Jordan Guide Study of Fishes II. x. 199 (caption) Sword-tail Minnow, male, Xiphophorus helleri Heckel. The anal fin modified as an intromittent organ.] 1915 Wellsboro (Pa.) Gaz. 2 Sept. 2/6 (heading) One hundred little sword tails born in aquarium. 1931 E. G. Boulenger Fishes xiii. 106 The Swordtails (Xiphophorus) of Mexican rivers are brilliant little fish about five inches long. The male is distinguished by a swordlike elongation of the lower portion of the tail, and a spiky development of the anal fin, which serves as an intromittent pairing organ. 1967 Times 18 Feb. 13/7 Whilst transferring a group of tropical fish from one tank to another I inadvertently and unknowingly dropped a young swordtail fish from the net. 1994 Nature 7 Apr. 494/1 In choice tests, swordtail females prefer males with larger swords. < as lemmas |
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