首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   14篇
  免费   15篇
  2021年   1篇
  2020年   2篇
  2019年   1篇
  2017年   3篇
  2016年   1篇
  2014年   10篇
  2013年   1篇
  2012年   2篇
  2008年   1篇
  2007年   1篇
  2005年   4篇
  2004年   1篇
  2000年   1篇
排序方式: 共有29条查询结果,搜索用时 15 毫秒
1.
Heads SW  Taylor SJ 《ZooKeys》2012,(169):1-9
A new species of the genus Ripipteryx (Orthoptera: Tridactyloidea: Ripipterygidae) from the Toledo District of southern Belize is described and illustrated. Ripipteryx mopanasp. n. is placed in the Scrofulosa Group based on its elaborately ornamented frons and is readily distinguished from its congeners by the fusion of the superior and inferior frontal folds to form a nasiform median process, the epiproct with both anterior and posterior margins emarginate, the subgenital plate with distinct lateroapical depressions either side of the median line, the basal plate of the phallus strongly bilobed apically, and the development of well-demarcated denticular lobes in the dorsal endophallic valves. A preliminary key to the species of the Scrofulosa Group is provided.  相似文献   
2.
3.
Sexual size dimorphism (SSD) is widespread and variable in nature. Although female‐biased SSD predominates among insects, the proximate ecological and evolutionary factors promoting this phenomenon remain largely unstudied. Here, we employ modern phylogenetic comparative methods on eight subfamilies of Iberian grasshoppers (85 species) to examine the validity of different models of evolution of body size and SSD and explore how they are shaped by a suite of ecological variables (habitat specialization, substrate use, altitude) and/or constrained by different evolutionary pressures (female fecundity, strength of sexual selection, length of the breeding season). Body size disparity primarily accumulated late in the history of the group and did not follow a Brownian motion pattern, indicating the existence of directional evolution for this trait. We found support for the converse of Rensch's rule (i.e. females are proportionally bigger than males in large species) across all taxa but not within the two most speciose subfamilies (Gomphocerinae and Oedipodinae), which showed an isometric pattern. Our results do not provide support for the fecundity or sexual selection hypotheses, and we did not find evidence for significant effects of habitat use. Contrary to that expected, we found that species with narrower reproductive window are less dimorphic in size than those that exhibit a longer breeding cycle, suggesting that male protandry cannot solely account for the evolution of female‐biased SSD in Orthoptera. Our study highlights the need to consider alternatives to the classical evolutionary hypotheses when trying to explain why in certain insect groups males remain small.  相似文献   
4.
5.
6.
7.
A Taxonomic study of Korean Tetrigidae (Orthoptera: Caelifera: Tetrigoidea) is revised. Twelve species are recognized including two species (Tetrix silvicultrix Ichikawa and T. minor Ichikawa) recorded for the first time in Korea. Keys and photographs of habitus for species are provided.  相似文献   
8.
9.
系统记录中国柯蚱属的种类,以检索表形式进行分类研究,共记述柯蚱属31种,其中包括1新种,即短翅柯蚱Coptotettix brachypterus sp.nov.。文中附有柯蚱属名录和种类分布。  相似文献   
10.
Taxonomy of a tetrigid genus Teredorus Hancock is reviewed. Two new species, Teredorus parvipulvillus sp. n. and Teredorus hunanensis sp. n. are described from China and an updated identification key to all known species of the genus is given, as well as brief comments on phylogenetic relationships, biology and ecology.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号