A revision of the genus Pandalus (Crustacea: Decapoda: Caridea: Pandalidae)

The genus Pandalus Leach, 1814, is revised based upon the abundant material from collections in various museums or institutions in the world. Altogether 20 species are recognized which appear to form five groups. Nineteen species are recognized in Pandalus, three of which are described as new: P. curvatus from southern Japan, and P. chani and P. formosanus from Taiwan. Four informal species groups are also recognized within the genus: P. montagui group (P. montagui Leach, 1814; P. borealis Krøyer, 1838; P. goniuruStimpson, 1860; P. jordani Rathbun, 1902; P. tridens Rathbun, 1902; and P. eous Makarov, 1935); P. stenolepis group (P. stenolepis Rathbun, 1902; P. curvatus sp. nov.); P. hypsinotus group (P. hypsinotus Brandt, 1851; P. danae Stimpson, 1857; P. prensor Stimpson, 1860; P. gracilis Stimpson, 1860; P. gurneyi Stimpson, 1871; P. nipponensis Yokoya, 1933; P. teraoi Kubo, 1937; P. chani sp. nov.; and P. formosanus sp. nov.); and P. platyceros group (P. platyceros Brandt, 1851; and P. latirostris Rathbun, 1902). The P. platyceros group appears to be most closely related to the genus Pandalopsis Bate, 1888, but Pandalus is retained as a possible paraphyletic group. Protandrous hermaphroditism is known in all but two species of the genus (P. curvatus and P. formosanus), for which only specimens of either male or female have been available. Pandalus propinqvus G. O. Sars, 1870, is transferred to a new monotypic genus Atlantopandalus, because of its lack of hermaphroditism and possession of some unique morphological characters, including one indicating a close relationsip to Dichelopandalus Caullery, 1896. All species are fully described and illustrated. The affinities and important morphological variations of the species are discussed. A key for adults is presented for the identification of the species. Biogeography of the genus is briefly discussed.     

政德翼核果--云南翼核果属一新种

发表产于中国云南的翼核果属一新种——政德翼核果(Ventilago zhengdei G.S.Fan)。     

千山的蕨类植物

蕨类植物是用孢子繁殖的一大类群.本文是关于千山蕨类植物种类、分布和经济用途研究的基础资料,供发掘利用蕨类植物资源以及科研教学参考.     

磁场对平菇作用的研究

作者用恒定磁场对平菇的两个品种进行处理。结果表明,磁场刺激能促进菌丝体的生长和发育,且在一定磁场强度下处理时间与菌丝体生长速度有明显正相关关系。     

磁场处理平菇同功酶分析

分别用1KGs,3KGs,5KGs不同剂量的恒稳磁场处理平菇后,做栽培试验,测定其生长速度,生长周期和产量,并用处理后的第一代子实体进行酶功分析,发现各处理组的谱带与对照组相比较,均发生变化,说明磁场对于平菇有诱变作用,经反复实验发现,1KGs处理平菇增产效果最佳。     

华北寒武系中、下统分界浅析——关于毛庄组时代问题的讨论

本文在简单回顾了目前对华北寒武系中、下统分界——即毛庄组时代问题不同处理意见之后,通过地层沉积特征方面的间接对比,南北生物地层的直接对比以及国际生物地层对比等,阐明了毛庄组应归属中寒武世早期的理由。尤其通过对地层划分原则的讨论,强调了以生物的“繁盛时”作为确定地层时代依据的认识。同时利用三叶虫科、属统计及生物亲缘关系分析的方法,为进一步探索解决这一问题的途径进行了新的尝试。     

青海省圆柏属植物

本文简述了青海省十一种圆伯属植物的地理分布,在渊初探中,对一些种的古老性特提出了证据.并对该属的变异中心、系统位置和祁连圆柏的分类问题提出了新的见解。     

红山茶组植物花粉外壁纹饰特征及其演化关系

花粉外壁纹饰不易受环境因子的影响,为植物基因型的外部表现,是研究植物分类演化的有效手段之一.用扫描电镜对山茶属红山茶组27种1变种植物花粉外壁纹饰特征进行观察,结果表明:红山茶组植物花粉粒的体积较大,规则花粉形状主要为长球形,某些种中存在不规则花粉.萌发孔均为三孔沟.山茶属红山茶组植物花粉外壁纹饰主要有皱沟状、皱波状、皱波状-颗粒状和颗粒状4种类型.不同种的花粉外壁纹饰存在一定差异,这些差异可为红山茶组种间分类及演化提供依据,同时也为某些种分类地位的确定和种系处理提供证据.     

Borneodessus zetteli,new genus and new species,notes on biogeography and a checklist of Dytiscidae from Borneo (Insecta: Coleoptera: Dytiscidae)

A new genus of Dytiscidae, Borneodessus gen. n., is described for Borneodessus zetteli zetteli sp. n. (Sabah, East Malaysia) and Borneodessus zetteli kalimantanensis ssp. n. (East Kalimantan, Indonesia). The new genus belongs to the tribe Bidessini because of the presence of two-segmented parameres of the aedeagus. A modified male clypeus is an apomorphy for Borneodessus zetteli. The species habitually resembles some species of Africodytes Biström, 1988 (Africa), Amarodytes Régimbart, 1900 (South America), and some Clypeodytes Régimbart, 1894 (Old World tropics). However, a sister group relation or closer affinities to any of the genera of Bidessini could not be established. Borneodessus is so far the first genus of Dytiscidae which is endemic to Borneo, but we suggest a certain probability of its occurrence in other Sundaic areas. The species is a rheobiont, being collected from forest streams. We briefly address biogeographical aspects and provide a checklist of Bornean Dytiscidae, indicating the currently known degree of endemism.     

A new genus and species of pinnotherid crab from Karachi,northern Arabian Sea (Crustacea,Decapoda, Brachyura)

A new monotypic genus, Sindheres, is established to accommodate a new species, S. karachiensis, of pinnotherid crab from the northern Arabian Sea. The new genus resembles Nepinnotheres Manning, 1993 in having the dactylus of the third maxilliped inserted near the mid-length of the ventral margin of the propodus but it differs in having a sub-hexagonal carapace.