The contribution of setal blades to effective swimming in the aquatic miteLimnochares americana(Acari: Prostigmata: Limnocharidae)
作者:
DAVID BARR,
BRUCE P. SMITH,
期刊:
Zoological Journal of the Linnean Society
(WILEY Available online 1979)
卷期:
Volume 65,
issue 1
页码: 55-69
ISSN:0024-4082
年代: 1979
DOI:10.1111/j.1096-3642.1979.tb01080.x
出版商: Blackwell Publishing Ltd
关键词: Acari;water mites;swimming setae;functional morphology;Limnochares;aquatic Prostigmata
数据来源: WILEY
摘要:
Two rows (anterior and posterior) of long fine setae inserted on the 3rd, 4th and 5th segments of the last two pairs of legs ofL. americanaform functional swimming blades. Each swimming setal is mounted in a mobile basal socket, and the structure of the setal base and socket configuration ensure that the blades will be passively erected during the leg's power stroke to provide increased thrust and collapsed during the recovery stroke to reduce water resistance. The erect swimming blades increase the effective area for thrust by approximately 500%, making it possible for the mite to lift itself off the bottom. The IVth legs contribute the greater proportion of the thrust developed during paddling, and the 4th segment (genu) bears the largest swimming blades on both legs.
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