Parker A R
Department of Zoology, University of Oxford, UK.
Philos Trans R Soc Lond B Biol Sci. 2000 Sep 29;355(1401):1121-4. doi: 10.1098/rstb.2000.0651.
This study reports a previously undescribed and unique sensillum. Some species of Lowrya Parker 1998 (Ostracoda: Cypridinidae) possess sensillae of an unusual type arranged in a single row parallel to, and near, the anterior, ventral and posterior margins of the external surface of each carapace valve. These sensilla are here termed coelotrichs, and are each centred within an almost spherical cavity in the carapace. The cavity forms at the base of a depression, and the depression in turn lies within a sunken channel on the exterior carapace surface. The opening of the coelotrich cavity bears a 'plug', through which only the widened, divided base of a seta passes. The seta is very fine and stiff throughout most of its length, and exhibits no pores. For most of its length the seta is orientated parallel to the carapace surface, shielded within the sunken channel. The coelotrich is probably a velocity detector, acted upon by the viscous drag of the surrounding fluid. Its function is probably to detect vibrations in the substrate, such as acoustic motion in the surrounding liquid, or steady fluid drainage motion.
本研究报告了一种此前未被描述过的独特感器。1998年的洛里亚属（Lowrya Parker）的一些物种（介形纲：海萤科）具有一种不寻常类型的感器，它们排成单行，与每个头胸甲瓣外表面的前缘、腹缘和后缘平行且靠近。这些感器在此被称为腔毛，每个都位于头胸甲中一个几乎呈球形的腔内的中心位置。该腔在一个凹陷的底部形成，而这个凹陷又位于头胸甲外表面的一个凹陷通道内。腔毛腔的开口处有一个“塞子”，只有一根刚毛变宽、分开的基部能穿过它。这根刚毛在其大部分长度上都非常细且硬，并且没有小孔。在其大部分长度上，刚毛与头胸甲表面平行，被屏蔽在凹陷通道内。腔毛可能是一个速度探测器，受周围流体的粘性阻力作用。它的功能可能是检测基质中的振动，例如周围液体中的声学运动或稳定的流体排水运动。
