Bickel Daniel J
Entomology Section, Australian Museum, 6 College Street, Sydney NSW 2010 Australia.; Email:
Zootaxa. 2015 Sep 21;4020(1):169-82. doi: 10.11646/zootaxa.4020.1.7.
The Costa Rican Systenus Loew (Diptera: Dolichopodidae: Medeterinae) are described, illustrated and keyed, and comprise nine new species: Systenus divericatus sp. nov., S. eboritibia sp. nov., S. emusorum sp. nov., S. flavifemoratus sp. nov., S. maculipennis sp. nov., S. naranjensis sp. nov., S. parkeri sp. nov., S. tenorio sp. nov., and S. zurqui sp. nov. Eight species are known only from Malaise traps at a locale in Guanacaste Province, in contrast to a single species collected as part of the long running INBio survey of the Costa Rican insect fauna. On a global scale, Systenus is uncommon in collections, possibly the result of its known larval tree hole habitat and adult arboreal associations, making the genus less likely to be captured by ground-level trapping. This makes the high level of sympatry at one site even more remarkable and suggesting that more cryptic species-rich arboreal faunas await discovery.
对哥斯达黎加的洛氏斯氏长足虻（双翅目：长足虻科：梅德特长足虻亚科）进行了描述、绘图并编制了检索表，该属包含9个新物种：分歧斯氏长足虻、象牙胫斯氏长足虻、埃穆氏斯氏长足虻、黄股斯氏长足虻、黄斑翅斯氏长足虻、纳兰霍斯氏长足虻、帕克氏斯氏长足虻、特诺里奥氏斯氏长足虻和祖尔奇氏斯氏长足虻。其中8个物种仅在瓜纳卡斯特省一个地点的马氏网诱捕器中被发现，相比之下，在对哥斯达黎加昆虫区系进行的长期INBio调查中仅采集到1个物种。在全球范围内，斯氏长足虻在标本收集中并不常见，这可能是由于其已知的幼虫树洞栖息地和成虫树栖习性，使得该属不太可能被地面诱捕所捕获。这使得一个地点的高同域性更加显著，并表明更多隐藏着丰富物种的树栖动物区系有待发现。
