Siphlonurus davidi ( Navás, 1932 ), Navas, 1932

Sartori, Michel & Peters, Janice G., 2004, Redescription of the type of Siphlonurus davidi (Navás, 1932) (Ephemeroptera: Siphlonuridae), Zootaxa 469, pp. 1-6 : 2

Siphlonurus davidi ( Navás, 1932)

( Figures 1–7 )

Siphluriscus ? davidi Navás, 1932: 929 .

Siphlonurus davidi ; Zhou & Peters, 2003: 346.

Material. Type of Siphluriscus ? davidi Navás in Paris Museum, with following 4 labels. 1) Museum Paris/ Se­Tchouen/A. David 1875; 2) 6/9 75 [not in handwriting of Navás, probably that of A. David and probably date of collection 6­IX­1875]; 3) Siphluriscus ? Davidi Nav. / Navas S. J. det [handwriting by Navás]; 4) TYPE [in red]. "Se­Tchouen" is an archaic spelling for Sichuan Province, China, according to Zhou (Zhou and Peters 2003).

Measurements. Given by Navás 1932: body 17 mm, forewing 20 mm, hind wing 9.5 mm; hind wing width estimated from torn wing at 7.2 mm.

Head. Brownish, mostly obscured by compound eyes that meet medially. Thorax. Pro­ and mesothorax brown with distinct median transverse suture. Mesonotal suture turned backwards; posterior margin of meso­ and metathorax carinated. Wings [left forewing damaged medially and posteriorly, right forewing broken; left hind wing mostly intact; right hind wing intact but folded]. Forewing length a little more than 1/3 width; MA fork distal to middle of wing and MP2 attached basally to MP1 at cross vein, but a small tear in this area and overlapping veins on both wings make exact vein connection difficult to interpret; CuA field with numerous intercalaries attaching vein to margin; CuP strongly curved; cross veins as in Figs. 1 , 6 . Hind wing broad (width approximately ¾ length), with MA fork distal and MP fork basal to middle of wing, forks symmetrical; CuA, CuP, and visible anal veins straight, anal area expanded but details not visible (Figs. 2,6). Distinct, dark blackish clouds surrounding cross veins in costal and subcostal cells of forewing; a similar color pattern more extensive in hind wing irregularly extending onto membrane across middle of wing and distally ( Figs. 1 –2,6). Legs. Foreleg segments declining in length from femur (longest) to tibia, tarsal segment 1, tarsal segments 2–3 subequal, and tarsal segments 4–5 subequal ( Fig. 6 ); foreclaws similar, hooked with small opposing hook. Abdomen. Base color of terga a pale brown; posterior half of terga 2–5 dark blackish brown, paler anteriorly; terga 6–8 with submedian blackish­brown lines (Figs. 4,6). Genitalia. Styliger plate shallowly concave; forceps with three visible segments and indication of a partially fused 4th basal segment within the subimaginal cuticle; penes short, without visible detail within subimaginal cuticle (Figs. 3,7). Caudal filaments. Right cercus present (left broken and missing), short, about equal to length of abdomen; a very short terminal filament present (length less than that of male forceps) ( Figs. 6–7 ).

Figures

FIGURES 1 – 5, Siphlonurus davidi: 1, left forewing (reconstruction, interpretation based on both wings, tear in MA and MP marked by?); 2, left hind wing; 3, ventral view of genitalia (line drawing reconstructed from photograph by Sartori); 4, terga 5 – 8 (approximate color pattern prepared from photograph by Legrand); 5, hind wing of S. mirus. Concave longitudinal veins stippled in Figs. 1 – 2,5.

FIGURES 6 – 7, Siphlonurus davidi, photographs: 6, pinned specimen (photographie J. Legrand, Entomologie, MNHN, Paris); 7, genitalia (cleared), ventral view (photograph by Sartori).