Sialis navasi, a new alderfly species from China (Megaloptera: Sialidae) Author Liu, Xingyue Author Hayashi, Fumio Author Yang, Ding text Zootaxa 2009 2230 64 68 journal article 10.5281/zenodo.190282 a2a4a688-816e-41aa-aeac-22fc77d4a8c1 1175-5326 190282 Key to adults of Sialis from China 1. Apex of abdomen posteriorly modified as a complicated assemblage of parts, ninth sternum present (male)............ 2 - Apex of abdomen gradually narrowed posteriad, ninth segment without ninth sternum ventrally, but leaving a pair of broad and membranous ninth gonocoxite (ovipositor) (female)................................................................................... 9 2. Pronotum mostly or entirely black................................................................................................................................ 3 - Pronotum entirely orange or yellowish brown ............................................................................................................. 4 3. Ninth tergum roundly inflated laterally in dorsal view ( Fig. 3 ); tenth tergum compactly fused with eleventh gono- coxite ( Fig. 5 ) ...................................................................................................................................... S. navasi sp. nov. - Ninth tergum convexed posteriad in dorsal view, without any lateral inflation; tenth tergum and eleventh gonocoxite apparently separated from each other as two independent structures........................................................................... 4 4. Ninth sternum broadly subtrapezoidal, much longer than ninth tergum ( Liu & Yang 2006a: Fig. 11 ).......................... .............................................................................................................................................................. S. kunmingensis - Ninth sternum transversely band-like, much shorter than ninth tergum....................................................................... 5 5. Ninth gonocoxite large, about 1.5 times as long as ninth tergum ( Liu & Yang 2006b : Fig. 4 a); eleventh gonocoxite reduced into a pair of extremely small and simply unguiform processes ( Liu & Yang 2006b : Fig. 4 a) ........ S. sibirica - Ninth gonocoxite small, shorter than ninth tergum; eleventh gonocoxite large, with proximal portion expanded later- ally to some degree ( Liu & Yang 2006b : Fig. 3 b) ........................................................................................................ 6 6. Tenth tergum strongly narrowed into a somewhat curved projection ventrad ( Liu & Yang 2006a: Fig. 15 )................. ....................................................................................................................................................................... S. sinensis - Tenth tergum ventrally without strongly narrowed projection ( Liu & Yang 2006b : Figs. 2 b, 3b)............................... 7 7. Eleventh gonocoxite with proximal expansion separated into two pairs of short and slender lobes ( Liu & Yang 2006b : Figs. 2 b) ........................................................................................................................................ S. henanensis - Eleventh gonocoxite with proximal expansion as a pair of broad and pterygoid lobes ( Liu & Yang 2006b : Figs. 3 b .. .................................................................................................................................................................... S. longidens 8. Tenth tergum long ( Liu & Yang 2006a : Fig. 7); eleventh gonocoxite medially with a pair of subtriangular expansions ( Liu & Yang 2006a: Figs. 7–8 ) ....................................................................................................................... S. elegans - Tenth tergum short ( Liu & Yang 2006a: Figs. 17, 18 ); eleventh gonocoxite medially with a pair of subquadrate expansions ( Liu & Yang 2006a: Fig. 19 ) ................................................................................................. S. versicoloris 9. Pronotum entirely black.............................................................................................................................................. 10 - Pronotum entirely orange or yellowish brown ............................................................................................................. 6 10. Eighth sternum transversely band-like, nearly 4.0–5.0 times as wide as long ( Liu & Yang 2006b : Figs. 4 d)........... 11 - Eighth sternum broad, nearly 3.0 times as wide as long ( Liu & Yang 2006a: Fig. 16 ).............................................. 12 11. Eighth sternum anteriorly with a deep median incision ( Liu & Yang 2006b : Figs. 4 d) ................................. S. sibirica - Eighth sternum anteriorly without distinct median incision ( Hayashi & Suda 1995: Fig. 5 e ) ................... S. longidens 12. Eigth sternum anteriorly truncate, medially with a rather narrow longitudinal depression ( Liu & Yang 2006b : Figs. 4 d) .................................................................................................................................................................. S. sinensis - Eighth sternum anteriorly concaved, medially with a borad longitudinal depression ( Liu 2008: Fig. 107d ) ................ .................................................................................................................................................................. S. henanensis 13. Wings narrow, about 1/3 of length ( Liu & Yang 2006a: Fig. 2 ) ............................................................ S. jianfengensis - Wings broad, about 1/2 of length ( Liu & Yang 2006a: Figs. 1 , 6 ) ............................................................................... 7 14. Head orange; eighth sternum with anterolateral portion prominent ( Liu & Yang 2006a: Fig. 20 ) ......... S. versicoloris - Head black; eighth sternum with anterolateral portion not prominent ( Liu & Yang 2006a: Fig. 9 ) .............. S. elegans