Notophlebia Peters & Edmunds 1970

KLUGE, NIKITA J., 2014, New Oriental tribe Iscini, new non-dilatognathan species of Notophlebia Peters & Edmunds 1970 and independent origin of Dilatognathus-type mouth apparatus in Atalophlebiinae (Ephemeroptera: Leptophlebiidae), Zootaxa 3760 (4), pp. 522-538 : 524-525

Notophlebia Peters & Edmunds 1970

Type species: Notophlebia hyalina Peters & Edmunds 1970 .

References: Peters & Edmunds 1970: larva (as " Nathanella "), imago; Sivaramakrishnan & Peters 1984: larva and imago.

Besides characters of Iscini (see above), known species of Notophlebia share the following common characters:

In larva:

(1) Labrum has both transverse setal rows (characteristic for Atalophlebopectinata—see Kluge 2009) transformed to fields of irregularly arranged setae ( Fig. 5 ; Peters & Edmunds 1970: 261; Sivaramakrishnan & Peters 1984: Fig. 14 ).

(2) Median projections of superlinguae project distad of hypopharynx ( Fig. 4 ; Sivaramakrishnan & Peters 1984: Fig. 16 ).

(3) Larval tibiae, besides setae present in most Leptophlebiidae (stout pointed bipectinate setae on inner side of fore tibia, stout setae on inner side of middle and hind tibiae, stout setae on outer side of hind tibia and long hairlike setae on outer side of all tibiae) bear an oblique longitudinal row of stout setae on anterior (dorsal) side. In N. ganeshi sp.n. this row is equally developed on all legs: on fore leg ( Figs 2a ; 14 ), on middle and hind legs ( Fig. 3 ); on all three pairs of legs setae of this row are unequal, elongate, stout and blunt (as in Fig. 54a ). In N. jobi row of such setae is present on middle and hind legs ( Fig. 54a ), but on fore leg it is substituted by a field of irregularly situated very long pointed filtering setae ( Fig. 53a ).

(4) Larval abdominal terga I–VI have no posterolateral projections; terga VII and VIII have short blunt projections; tergum IX has long blunt projections ( Fig. 3 ) (plesiomorphy; unlike Isca , whose abdominal terga I– VIII have no projections, and only tergum IX has long blunt projections).

(5) Tergalii [see Iscini (5)] are modified as following. Each tergalius I–VI has each of two lamellae blunt (instead of pointed in Isca and most other Leptophlebiidae ); tergalius II is a little longer than tergalius I; tergalii III–VI are gradually shorter from anterior to posterior ones, having similar width; tergalius VI is much smaller; tergalius VII is lost ( Figs 31–34, 40–45 ). All tergalii participate in rhythmic respiratory movements, and movements of most anterior tergalii are most intensive (in contrast to Choroterpini, Indialis , Nathanella and Petersula , whose tergalii of first pair are immobile).

In adult:

(6) Fore wing of all 3 species has the same coloration: proximal half of subcostal field is darkened, while remainder membrane is lighter; cross veins in proximal part of wing are bordered by brown, while remainder cross veins are light ( Fig. 1 ; Peters & Edmunds 1970: Fig. 346; Sivaramakrishnan & Peters 1984: Fig. 3 ). Besides this, fore wings have following characters: long and narrow, with convex proximal-anal margin (unlike Nathanella ); MP without symmetric fork (unlike some species of Isca ); imago has marginal setae as in subimago (unlike some species of Isca ). Hind wings are lost [see Iscini (8)].

(7) Penis [deeply separated—see Iscini (12)] has following characteristics common for all 3 species: Apically each penis lobe bears a slender pointed serrate projection—either curved [in N. jobi ( Sivaramakrishnan & Peters 1984: Fig. 3 )], or straight [in N. ganeshi sp.n. and N. hyalina ( Figs 23, 24 , 26–30 ; Peters & Edmunds 1970: Fig. 349)]. Distal part of gonoduct is covered by cuticle both in imago and larva ( Figs 37, 45 ) (the same in some other taxa).

Variable characters of Notophlebia . Mouthpart structure strongly varies among species: N. ganeshi sp.n. has non-modified mouth apparatus [except labral setae—see (1)]; Notophlebia jobi has mouth apparatus of « Dilatognathus - type », with following modifications: maxilla with a long inner-apical tusk and without apical flange, dentiseta and apical-ventral pectinate setae; maxillary palp filtering, with 1 st palpomere strenghted, 2 nd and 3 rd palpomeres elongated and 3 rd palpomere bearing long setae arranged in transverse rows; labial palp filtering, with 2 nd palpomere strongly shortened and 3 rd palpomere strongly elongated and bearing long setae arranged in transverse rows ( Figs 46–51 ; Sivaramakrishnan & Peters 1984: Fig.13–17 ; Kluge 2012: Table 1).

Dimensions. Fore wing length (and approximated body length) 6–8 mm.

Distribution and composition. South-western India (Western Ghats). Three species: Notophlebia hyalina Peters & Edmunds 1970 ; N. jobi Sivaramakrishnan & Peters 1984 ; N. ganeshi sp. n. Among them, larvae are known only for N. jobi and N. ganeshi .

Figures

FIGURES 4–10. Notophlebia ganeshi sp. n. Larval mouthparts (at the same magnification, except 6). 4, hypopharynx and superlinguae; 5, labrum (setae of distal transverse row not shown, their bases shown as dots and levels of their apices shown by dotted line); 6, apex of maxilla, ventral view; 7, maxilla, ventral view (apical and median setae not shown, their apices shown by dotted lines); 8, labium (dorsal view at left, ventral view at right); 9, apex of labial palp, dorsal view; 10, left mandible (5, 10, holotype).

FIGURES 11–20. Notophlebia ganeshi sp. n. 11, male imaginal mesonotum; 12, male subimaginal exuviae of right half of mesonotum. 13–19, legs at the same magnification (arrows show ontogenesis): 13, fore leg of male imago; 14, fore leg of male larva (long hair-like setae not shown); 15–17, fore, middle and hind legs of male subimago; 18, hind leg of male imago; 19, fore leg of female imago. 20, tarsus of larval hind leg before molt to subimago (larval cuticle shown as optic section by black; subimaginal cuticle shown by integral lines; imaginal claw developing under subimaginal cuticle shown by interrupted lines). 21, posterior margin of abdominal sternum IX of mature female larva; 22, the same, of female imago (12–18, holotype). Abbreviations: LPs, lateroparapsidal suture; MNS, mesonotal suture; MPs, medioparapsidal suture.

FIGURES 1–3. Notophlebia ganeshi sp. n. 1, fore wing (holotype); 2, distal part of larval fore tibia, posterior view (stout setae on anterior side shown by interrupted lines); 3, male larva of penultimate instar, lateral view (long hair-like setae on legs not shown). Abbreviations: a, row of stout setae on anterior side; p, row of stout setae on posterior side.

FIGURES 52–54. Notophlebia jobi. 52, distal part of larval fore tibia, posterior side; 53, the same, anterior side; 54, distal part of larval middle tibia, anterior side. Abbreviations: a, row of stout setae on anterior side; h, hair-like setae on outer side; p, row of stout setae on posterior side.

FIGURES 31–45. 31–38, Notophlebia ganeshi sp. n.; 39–45, Notophlebia jobi. 31–34 and 40–43, tergalii of I, II, V and VI pairs (ventral lamella turned back); 35, claw; 36 and 44, pronotum and mesonotum of last instar larva; 37 and 45, posterior margin of abdominal sternum IX of mature male larva and protopenis, dorsal view (gonoducts lined by cuticle shown by interrupted lines); 38 and 39, posterior margin of larval abdominal tergum VI (37, 38, holotype).

FIGURES 23–25. Notophlebia ganeshi sp. n. (holotype). 23, genitals of male imago, ventral view (at left, brown pigmentation of sternum, styliger and gonostylus shown by dots; at right, brown pigmentation of penis shown by dots, muscles shown by interrupted lines); 24, penis lobe, dorsal view; 25, exuviae of subimaginal gonostylus.

FIGURES 26–30. Notophlebia ganeshi sp. n., genitals of male imago. 26, genitals at rest, ventral view; 27 penis apex, ventral side; 28, the same, dorsal side; 29, genitals in excited condition, with gonostylus turned ventrally and penes projected; 30, penis apex, apical-dorsal side (26–28, holotype).

FIGURES 46–51. Notophlebia jobi. 46–49, third segment of maxillary palp (46 and 48, ventral side; 47 and 49, dorsal side); 50–51, base of third segment of labial palp, dorsal side).