| 词汇 | proboscis |
| 释义 | proboscis noun[ C ] biology specializeduk /prəˈbɒs.ɪs/ us /proʊˈbɑː.sɪs/pluralprobosces the long nose of some animals, or the long tube-like mouth of some insects: （动物的）长鼻;（昆虫的）喙 An elephant's trunk is a proboscis.象鼻很长。 The head & neck of non-human animals antler beak bill cockscomb comb crest crested crop dewlap horned jaw muley muzzle neck nose pouch scruff sucker wattle You can also find related words, phrases, and synonyms in the topics: The development & parts of insects Examples of proboscisproboscis The immune response mounted by fish hosts is unspecific and essentially limited to the formation of a haemocyte capsule around the worm's proboscis. Flies were dissected 27-46 days later and the midgut, proboscis and salivary glands of each fly were examined for the presence of trypanosomes. The four proboscides and the two bothridia are fully formed, and the former are often protruded. The leech still continues to harbour the trypanosomes; others present in the gut succeed those that disappear from the proboscis after each feed. In both larvae and adults the distal portion of the reversible scolex proboscides bears small microtriches, 0-25 /ira long. Cystacanths are encased in an envelope, and, with their proboscis invaginated, their overall body shape is roughly ovoid. He therefore concluded that the mode of infection is contaminative through the tick's excreta and not active through its proboscis. An aphid was recorded feeding if it was stationary with its proboscis inserted into the plant and its antennae pointing backwards. The flea does not infect the rat through its proboscis, and the parasites are not found in the flea's salivary glands. The palpi of the male are seven-tenths as long as the proboscis, the antennae plumose and about half as long as the proboscis. An apical view of the proboscis shows a central depression with 18 longitudinal rows with eight hooks in each row (fig. 1a,b). The trypanosomes disappear from the fly's proboscis very soon after the insect has partaken of infected blood. Proboscis : basal half shining coppery, apical half dark without metallic lustre. There could be a gene for having a long nectar tube in the flowers and a gene for a long proboscis in the bees. Palpi a bit less than one-third as long as proboscis, the latter as long as fore femora. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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