多核织毛虫─新种,无性生殖周期中的形态及形态发生

MORPHOLOGY AND MORPHOGENESIS OF HISTRICULUS MULTINUCLEATA SP. NOV.DURING ASEXUAL REPRODUCTION (Ciliophora, Hypotrichida)

本新种的典型特征为：表膜较薄但不弯曲，无表膜下颗粒；区别于该属其它种的最突出特点是具有多个大核（5．4±1．4）；背触毛6列，在第3－4列之间具有一些额外散在的背触毛。口围由42．3±2．2片小膜组成；额、腹、横、尾棘毛恒为8：5：5：3结构；本新种的形态发生结果与该属其它种类相同，6列新背触毛原基分别来源于背部的3列老背触毛和腹部的老右缘棘毛，在第3及第4列新背触毛列之间可见新出现并散在的几根背触毛。

A description of the morphology and morphogenesis of the hypotrichous fresh water ciliate Histriculus multinucleata sp. nov., collected from a puddle near a reservoir in Harbin suburbia in Heilongjiang province is given. The morphology,infraciliature, morphogenesis and relationship with other species in the same genus are studied. The new species has same characters as the other species in the same genus,being pellicularly thinner, but inflexible, without subpellicular granule. The most obvious character of the new species is that it has more nuclei (5.4±1.4). The adora zone of membranelles is consisted of 42.3±2.2 membranelles. The fronto cirri,ventral cirri, transverse cirri and caudal cirri are identical as 8:5:5:3. All basic developmental processes in morphogenesis resemble those of other species in the same genus. The charcteristic for the present species is the extra irregular bristles between the dorsal kinety (DK) of 3-4.Type location: Collected from a small puddle near a reservoir in Harbin(45°45' N, 126°36'E), Heilongjiang Province, China.Type-specimens: Slides of holotype and paratype specimens have been deposited in Research Laboratory on Portozoa in Harbin Normal University and Fishery College,Ocean University of Qingdao.