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By oilshale
Kingdom: Animalia
Phylum: Arthropoda Latreille 1829
Class: Insecta Linnaeus 1758
Order: Mecoptera Packard 1886
Family: Nannochoristidae Tillyard 1917
Genus: Itaphlebia
Species: Itaphlebia laeta
Author Citation Liu et al. 2010
Eon: Phanerozoic
Era: Mesozoic
Period: Jurassic
Sub Period: None
Epoch: Middle
International Age: Callovian to Oxfordian
Jiulongshan Formation
Daohugou Bed
Acquired by: Purchase/Trade
Length: 8 mm
Daohugou (Village)
Ningcheng (County)
Inner Mongolia (Province)
China
Taxonomy from Mindat.org.
Diagnosis from Liu et al. 2010: "Costal area narrow. In forewing, Sc simple, terminating at C near pterostigma; M with 4 branches; Cu 1 and M forked before the cross-vein cu 1 -cu 2."
Description from Liu et al. 2010: "Antenna filiform, incompletely preserved. Femur shorter than tibia. Tibial spurs not present. Setae irregularly arranged.
Costal area narrow, one cross-vein c-sc between C and Sc. Sc simple, ending at C and extending to pterostigmal area. One short cross-vein sc 2 -r 1 before pterostigma. Rs arised at the same level to cross-vein csc. Rs with 4 branches. Length of R 2 two-thirds that of stem of R 2 + 3. Cross-vein r 1 -r 2 at level of pterostigma. Cross-vein r 3 -r 4 at level of cross-vein r 1 -r 2. Cross-vein r 5 -m 1 + 2 approximately at middle of wing length. Crossvein r 5 -m 1 proximal to cross-vein r 4 -r 5. One cross-vein r 4 -r 5 dividing cell R 4 into 2 cells. Conspicuous thyridium at fork of M, which has 4 branches. M 3 + 4 divided beyond the fork of M 1 + 2; cross-vein m 1 + 2 -m 3 between M 1 + 2 and M 3; cross-vein m-cu not straight, slightly S-shaped. Cu 1 coalesced with M for a short distance and separated from M before cross-vein cu 1 -cu 2. One cross-vein a 1 -a 2 connected 1 A and 2 A. 3 A absent.
Female abdomen with 11 segments, segments 9–11 smaller than segment 8. One pair of cerci located at apex of abdomen. Right cercus with 3 segments. Third segment of left cercus not preserved. Basal segments fused with abdomen segment 11.
Body length 7.8 mm, forewing length 8.2 mm, width 2.6 mm."
Line drawing of the left forewing from Liu et al. 2010:
Reference:
NAN LIU, YUNYUN ZHAO & REN (2010) Two new fossil species of Itaphlebia (Mecoptera: Nannochoristidae) from Jiulongshan Formation, Inner Mongolia, China. Zootaxa 2420: 37–45.
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