辽宁北票晚侏罗世丽蛉化石二新属(脉翅目,丽蛉科)

TWO NEW LATE JURASSIC GENERA OF KALLIGRAMMATIDS FROM BEIPIAO, LIAONING(NEUROPTER A,KALLIGRAMMATIDAE)

描述丽蛉科化石 2新属 2新种 :美形山丽蛉Oregrammagloriosagen .etsp .nov .,奇异沼泽丽蛉Limnogrammamiragen .etsp .nov .。标本采自辽宁省北票市晚侏罗世义县组地层中。模式标本保存在首都师范大学生物系。

Oregramma gen. nov. Etymology. From “Ore-”(mountain) and “gramma” (line). Type species: Oregramma gloriosa gen. et sp. nov. Diagnosis. An eye-spot present on forewing. Humeral recurrent vein absent. All c ostal veinlets straight, unforked. Sc terminated on R1. Rs with 12 branches, the first one not reaching the wing′s margin, most of them not forked before margi n al twiggings. MA with 4 pectinate branches near wing margin. MP at base forked, with 4 pectinate branches. CuA forked pectinately. CuP single, with some branche s at margin. Both 1A and 2A parallel with CuP for a long distance. 3A simple. Included species: only the type species. Discussion. The Oregramma gen. nov. is quite similar to Kalligramma W alther, 1904; but can be distinguished from the later mainly by the following combinatio n of characters. All costal veinlets straight, unforked; MP at base forked, with 4 pectinate branches.Oregramma gloriosa gen. et sp. nov.(Figs.1,2) Etymology. From gloriosa, meaning the specimen preserved well. Holotype. A well-preserved complete right forewing, registration No.LB2009. Locality and horizon. Huangbanjiegou, near Chaomidian Village, Beipiao City, Lia oning Province, NE China; 2nd Member of Yixian Formation, Late Jurassic (Tithoni an). Description. Forewing length 75?mm, width 30?mm. wing without trichosors and m icrotrichia. The details of forewing venation are shown in Fig.2.Limnogramma gen. nov. Etymology. From “limno-”(swap) and “gramma” (line). Type species: Limnogramma mira gen. et sp. nov. Diagnosis. An eye-spot present in hindwing. Humeral recurrent vein present. All costal veinlets straight, most of them unforked, crosveins present between them . Rs with 5 branches at least, most of them forked before marginal twiggings. MA single. MP at base forked pectinately, with 3 branches. CuA single and simple. CuP at base forked at wing base. 1A long and single. 2A parallel with 1A for a l ong distance, forked pectenately.3A undeveloped. Included species: only the type species. Discussion. The Limnogramma gen. nov. somewhat resembles Kalligramma W alther, 1904 ; but can be distinguished from the later mainly by the following combination of characters. All costal veinlets straight, unforked, a few crosveins present bet ween them; MA single; CuP forked at wing base; 1A long and single.Limnogramma mira gen.et sp.nov.(Figs.3,4) Etymology. From mira, meaning the specimen is very special. Holotype. A well-preserved incomplete left hindwing, registration No.LB2001 0. Locality and horizon. Huangbanjiegou, near Chaomidian Village, Beipiao City, Lia oning Province, NE China; 2nd Member of Yixian Formation, Late Jurassic (Tithoni an). Description. Forewing length 60?mm, width 34?mm.Wing without trichosors and mi crotrichia. The details of venation of the hindwing are shown in Fig.4.