Table 2 The summary of morphological characters of the male imagines to distinguish extant and extinct representatives of the genus Calliarcys. Distinct differential characters are marked in bold.
Characters (male imago) | Calliarcys antiquus sp. nov. | Calliarcys humilis | Calliarcys van |
|---|---|---|---|
Head | |||
Compound eyes colour: upper portion | – | Creamy to orange pink | Brick-red |
Compound eyes colour: lower portion | – | Black to blackish grey | Black to blackish grey |
Compound eyes: shape | Distinctly large, contiguous | Middle-sized, widely separated | Large, separated |
Wings: cross venation | Well-developed | Ordinarily developed | Ordinarily developed |
Forewing | |||
Width/length ratio | 0.38 | 0.35–0.38 | 0.36–0.38 |
Pterostigmatic venation | 6–7 forked and 2–3 simple veins | 8–12 simple veins | 6–8 simple veins |
Cubital venation: longest vein | iCu2 | iCu3 | iCu3 |
Hind wing | |||
Ratio to forewing length | 3.74–3.81 | 3.30–3.60 | 3.8–4.0 |
Width/length ratio | 0.54 | 0.50–0.54 | 0.52–0.54 |
Costal process: location | Middle of wing length | Before middle of length | Middle of wing length |
Costal process: shape | Widely rounded apically | Step-like, acute apically | Smoothly rounded apically |
Number of cross veins between MA and MP | 8 | 1–2 | 1–2 |
Number of cross veins between MP and CuA | 2 | 0 | 0 |
Cubital triad | Complete | Not complete | Not complete |
Abdomen | |||
Colour of terga | – | Uniformly brown to dark brown | Yellowish-brown strip anteriorly |
Genitalia | |||
Median projections of styliger: shape | Nearly finger-like | Finger-like | Nearly triangular |
Forceps segment I: inner hump | Present | Absent | Absent |
I. Penis lobes: general shape | (?) separated basally | Fussed basally | Fussed basally |
II. Penis lobes: general shape | Relatively robust, shortened | Relatively elongated | Relatively robust, shortened |
III. Penis lobes: shape of tip | Slightly bent inward | Distinctly bent inward | Slightly bent inward |
