摘要
本文在科级阶元水平分析了叶蜂总科的地理分布特征。叶蜂总科在科、亚科和族级水平上可分为3种,9种和16种分布型。在各级水平上,全北界分布型均占有绝对优势,其中东亚地区中南部是主要分布中心。文中还简要阐述了世界膜翅目广腰类群的分布特性;提出了一个简明实用的“类元分布指数It”,用于表示特定地区某一或全部生物类群的各级阶元的分布数量与世界已知阶元总数之比值。此指数稍作修改提出一个类群起源可能性指数Io,用于表示某一类群在一特定区域起源的可能性大小。
The distribution characteristics of genera crossing two or more zoogeographical realms are analyzed systematically and twelve main distribution patterns are recognised from them. The holarctic pattern can be divided into six subpatterns. Some hypotheses and inferences on the origination and migration of some distribution patterns are also proposed. The relationships between zoogeographical realms are also briefly discussed.