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Remarkable cases of diurnal mass aggregations of Oriental species of Orectochilus subg. Patrus Aube

机译:东方东方of的昼夜质量聚集的显着情况。 Patrus Aube

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Remarkable cases of gregarious behavior of several Oriental species of Orectochilus Dejean, 1833 subgen. Patrus Aube (Coleoptera: Gyrinidae) are reported from India, Thailand and Indonesia. Terminology and possible causes of gyrinid mass aggregations are briefly discussed. Three types of diurnal aggregations of O. (Patrus) haemorrhous Regimbart, 1902 are described: 1) "terrestrial clusters" (numerous individuals resting motionless and densely packed immediately above the water line), 2) "body rafts" (numerous more or less motionless individuals floating densely packed side by side on the water surface), 3) "surface swarms" (numerous individuals gyrating close together on the water surface). Gyrinid body rafts are here described for the first time.
机译:1833年亚种Orectochilus Dejean的几种东方物种合群行为的显着案例。印度,泰国和印度尼西亚都有Patrus Aube(鞘翅目:Gyrinidae)的报道。简要讨论了陀螺状质量聚集的术语和可能原因。描述了三种类型的O.(Patrus)出血性日粮的日间聚集体,1902年:1)“陆地簇”(许多个体静止不动,紧紧地堆积在水线以上),2)“人体筏”(或多或少一动不动的人并排密集地漂浮在水面上),3)“水面群”(许多人在水面上并排旋转)。此处首次描述了陀螺体筏。

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