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  • Itaphlebia laeta Liu et al. 2010


    Images:

    oilshale

    Taxonomy

    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

    Geological Time Scale

    Eon: Phanerozoic
    Era: Mesozoic
    Period: Jurassic
    Sub Period: None
    Epoch: Middle
    International Age: Callovian to Oxfordian

    Stratigraphy

    Jiulongshan Formation
    Daohugou Bed

    Provenance

    Acquired by: Purchase/Trade

    Dimensions

    Length: 8 mm

    Location

    Daohugou (Village)
    Ningcheng (County)
    Inner Mongolia (Province)
    China

    Comments

    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:

    image.png.485819df1ded51354fef2a0d941d2af1.png

     

    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.




    User Feedback


    oilshale

    Posted (edited)

    5 hours ago, RJB said:

    Beautiful bug!!!

     

    RB

    Thanks Ron,
    this critter is really tiny (8 mm). A few days ago I almost threw away the slab because I didn't spot the tiny one right away.

    Edited by oilshale

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