贵州剑河寒武纪凯里组遗迹群落中的节肢动物遗迹

Arthropods Tracks in Kaili Ichnocoenosis from Lower—Middle Cambrian Kaili Formation in Jianhe County, Guizhou Province, China

贵州剑河凯里组中产有丰富的遗迹化石,本文描述了其中的节肢动物遗迹9个属23个种(其中1个新属,9个新种)和3种类型的趾迹。发现并讨论了节肢动物(三叶虫)的捕食迹和求偶迹及其形成过程;研究了节肢动物生活行为所产生行迹之间的变化,认为节肢动物各行迹之间的过渡类型的变化具有停息→爬行→行走→游泳和游泳→行走→爬行→停息两向性变化的特点,并认为在运动弯道上形成的过渡行迹可能与造迹生物在转弯处的运动惯性或与水动力造成造迹生物身体的倾斜有关。含丰富节肢动物遗迹的凯里生物群的沉积环境为正常浪基面和风暴浪基面之间的浅海软质基底低能环境。

Abundant arthropods tracks, including Beaconichnus , Cruziana , Did ymaulichnus , Dimorphichnus , Diplichnites, Monoaulichnus （n. igen. ）, Monomorphichnus, Parallehelcura and Rusophycus, have been fond in the Lower--Middle Cambrian Kaili Formation at Balang Village, Jianhe County, Guizhou Province, China. The arthropods tracks described herein contain 9 ichnogenera, 23 ichnospecies, of which 1 ichnogenera and 9 ichnospecies are new. The preying and courting tracks produced by trilobites （or arthropods） are found in the Kaili Formation. The track transformations of the arthropods moving tracks have two changes： from resting trace to furrowing trace to walking trace to swimming trace, and from swimming trace to walking trace to furrowing trace to resting trace. The transforming tracks in turnings reasoned that the bodies of track-makers were tilted due to the water energy or the moving inertia in turnings. The Kaili Formation yielding the Kaili ichnocoenosis was deposited in shallow sea with lower energy and softground, between daily wave base and storm wave base.