Sialis
Creators: name: Liu, Xingyue
name: Hayashi, Fumio
name: Yang, Ding
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Megaloptera
Sialidae
Sialis

description: 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
description: Published as part of Liu, Xingyue, Hayashi, Fumio & Yang, Ding, 2009, Sialis navasi, a new alderfly species from China (Megaloptera: Sialidae), pp. 64-68 in Zootaxa 2230 on page 65, DOI: 10.5281/zenodo.190282