内蒙古道虎沟中侏罗世原褶蚊科化石记述(昆虫纲,双翅目,原褶蚊科)

MIDDLE JURASSIC EOPTYCHOPTERIDAE FROM DAOHUGOU,INNER MONGOLIA,CHINA (INSECTA,DIPTERA,EOPTYCHOPTERIDAE)

描述原褶蚊科Eoptychopteridae Handlirsch,1906化石3新种,华美刻痕原褶蚊Crenoptychoptera decorosa sp.nov.,普通刻痕原褶蚊Crenoptychoptera vulgaris sp.nov.,近刻痕原褶蚊Crenoptychoptera vicina sp.nov.。所有标本均采自内蒙古宁城道虎沟中侏罗世九龙山组,模式标本保存在首都师范大学生命科学学院。

This paper deals with three new species of fossil Crenoptychoptera,C.decorosa sp.nov.;C.vulgaris sp.nov.;C.vicina sp.nov.All the specimens were collected from Jiulongshan Formation,Middle Jurassic in Inner Mongolia,China.All type specimens are deposited in the Capital Normal University.Crenoptychoptera decorosa sp.nov.（Figs.1,4）Holotype.A well-preserved body with wings,No.：CNU-DIP-D-NN2008016.Paratype.No.CNU-DIP-D-NN2006701,No.CNU-DIP-D-NN2006704.Horizon and locality.Jiulongshan Formation,Middle Jurassic,Daohugou Village,Ningcheng County,Inner Mongolia in China.Description.Body length 8？mm as preserved.Thorax massive and nearly oval,abdomen with 8 visible segments,subcylindrical.Legs covered with sparse bristles.Antennae with 9 segments as preserved.Wing length 9？mm and width 2.5？mm.All veins of nearly same thickness.Sc short,less than one-half wing length,Pt obviously.R_1 in three-fourths wing length,reaching vein C.Vein Rs short,arising from basal one-third wing length,furcated R_ 2＋3 and R_ 4＋5.R_2 short and straight,R_4 as long as R_5.M stem well developed with exception of basal section,furcated three branches;M_1 is longer than M_2,M_ 3＋4 long,m-m mising.Comparison.The new species is similar to C.conspecta Lukashevich,1995;C.dobbertinensis Ansorge,1998;C.gronskayae Kalugina,1989;C.bavarica Krzeminski ＆ Ansorge,1995;C.antica Kalugina,1985;C.defossa Kalugina,1985,but can be easily separated from them by having different position of r-m and having crossvein sc-r.Etymology.From Latin ＂decorosa＂,means ＂beautiful＂.Crenoptychoptera vulgaris sp.nov.（Figs.2,5）Holotype.Body with well preserved wings,No.CNU-DIP-D-NN2008101.Paratype.No.CNU-DIP-D-NN2006702,No.CNU-DIP-D-NN2006703.Horizon and locality.Jiulongshan Formation,Middle Jurassic,Daohugou Village,Ningcheng County,Inner Mongolia in China.Description.Body length 8？mm as preserved.Thorax massive and nearly oval,abdomen with 7 visible segments,subcylindrical.Legs stronger and covered with sparse bristles.Antennae preserved.Wing length 7.5？mm and width 3？mm.All veins of nearly same thickness.Sc missing;R_1 straight and three-fourths wing length and thicken;Rs arising from basal one-fourth wing length,furcated R_ 2＋3 and R_ 4＋5.R_2 straight,R_3 is longer than R_4 and R_5,R_4 as long as R_5.Crossvein r-m inclined.M stem well developed with exception of basal section,furcated three branches;M_1 as long as M_2.Comparison.The new species is similar to C.conspecta Lukashevich,1995;C.dobbertinensis Ansorge,1998;C.gronskayae Kalugina,1989;C.bavarica Krzeminski ＆ Ansorge,1995;C.antica Kalugina,1985;C.defossa Kalugina,1985,but can be easily separated from its by having different position of r-m.Compared to C.decorosa sp.nov.mainly in crossvein sc-r.Etymology.From Latin ＂vulgais＂,means ＂ordinary＂.Crenoptychoptera vicina sp.nov.（Figs.3,6）Holotype.A well-preserved body with wings,No.CNU-DIP-D-NN2008099.Paratype.No.CNU-DIP-D-NN2006705,No.CNU-DIP-D-NN2008091,No.CNU-DIP-D-NN2008143.Horizon and locality.Jiulongshan Formation,Middle Jurassic,Daohugou Village,Ningcheng County,Inner Mongolia in China.Description.Body length 7.5？mm as preserved.Thorax massive and nearly oval,abdomen with 8 visible segments,subcylindrical.Legs stronger and covered with sparse bristles.Antennae preserved.Wing length 6？mm and width 2.6？mm.All veins of nearly same thickness.Sc short,little short than one-third length of wing;R_1 curved and three-fourths wing length;Rs arising from basal one-foutht wing length,furcated R_ 2＋3 and R_ 4＋5.R_2 straight,R_3 is longer than R_4 and R_5,R_4 as long as R_5.Crossvein r-m short.M stem well developed with exception of basal section,furcated three branches;M_1 as long as M_2,Cu slightly sigmoid.A_1missing.Comparison.The new species is similar to C.conspecta Lukashevich,1995;C.dobbertinensis Ansorge,1998;C.gronskayae Kalugina,1989;C.bavarica Krzeminski ＆ Ansorge,1995;C.antica Kalugina,1985;C.defossa Kalugina,1985,but can be easily separated from its by having different position of r-m.Compared to C.decorosa sp.nov.mainly in crossvein sc-r;compared to C.vulgaris sp.nov.mainly in R_1.Etymology.From Latin ＂vicina＂,means ＂vicinity＂.