On the taxonomic status and biogeography of the Isolapotamidae Bott, 1970 (Decapoda,Brachyura)

Recent investigations of Asian freshwater crabs of the superfamily Potamoidea Ortmann, 1896 use the Potamidae Ortmann, 1896 as the only valid family, although three families have been described from South-East Asia: the Potamidae Ortmann, 1896, the Isolapotamidae Bott, 1970 and the Sinopotamidae Bott, 1970. Crabs formerly included in the Isolapotamidae are re-examined based on a new understanding of the morphology and function of the male gonopods. In particular, the morphology of the sperm transfer tube of the second gonopod is studied in detail. At least four types of sperm transfer are recognized representing four different modes of sperm transfer. Each type is morphologically constant for a number of genera. On the basis of these results the taxonomic status of the family Isolapotamidae is reconsidered. A new genus Takpotamon is erected for Potamon maesotense Naiyanetr, 1992 from Thailand, the genera Dromotelphusa Naiyanetr, 1992 and Flabellamon Ng, 1996 are re-characterized and the genus Thaiphusa Ng and Naiyanetr, 1993 is synonymized with Demanietta Bott, 1966. All the morphological results show biogeographical relevance and the resulting distribution patterns reflect the palaeogeographic and palaeoclimatic situation of Sundaland during the Tertiary and Quaternary.     

博格达山下二叠统塔什库拉组沉积特征及古地理分析

博格达山属于晚古生代的陆间裂谷。在早二叠世晚期,它为走向近东西的槽型盆地。盆地轴部位于博格达北坡及主峰一带,南北两侧为构造控制的高角度斜坡。斜坡上发育块体搬运的重力流沉积和内陆棚粗粒风暴岩。块体搬运的重力流顺斜坡演化为浊流,进入盆地轴部后转为由东往西顺盆地走向流动,并在轴部形成一套经典浊积岩。     

亚洲东部的泥盆系

亚洲东部的泥盆系按其发育历史和分布,大致可以分成相对稳定的大陆大区和相对活动的陆间大区两类。亚洲东部共分成7大区(其中3个为大陆大区,4个为陆间大区)、13区、46分区、125小区。 泥盆纪亚洲东部有西伯利亚、华北—塔里木、印度、哈萨克斯坦、华南等大小不等、活动性质各异的13个古板块,当时它们当中的大多数板块都分布于赤道两侧的中、低纬度地区。 亚洲东部泥盆纪有6个古动物地理区,每一个区都与赤道暖流的不同分支相连系,但它们均同属于一个老世界域。 本文还分别对各个板块泥盆纪古地理的演化和10个全球性生物事件作了概要的阐述.