Ephemerythus nigricolor sp.

Kluge, Nikita J. & Novikova, Eugenia A., 2017, Revision of Ephemerythus Gillies 1960 (Ephemeroptera: Tricorythidae), Zootaxa 4347 (1), pp. 31-55 : 41-44

Ephemerythus nigricolor sp. n.

( FIGS 27–38 )

Material. HOLOTyPE: L-S-I ♂ {SPEcImEN [XV](6)B 2 014}, ZAMBIA, MWINILuNGA REGION: RIvER WEST LuNGA NEAR MWINILuNGA, 11°45'S, 24°26'E, 20.VIII.2014, cOLL. N. KLuGE & L. SHEykO . PARATyPES: THE SAmE LOcALITy, 14– 17.VIII.2014, coll. N. Kluge & L. Sheyko: 1 L-S-I ♂, 1 L-S-I ♀, 1 L-S ♀, 15 larvae; River Mudanyama in MWINILuNGA, 11°44'S, 24°25'E, 14–17.VIII.2014, cOLL. N. KLuGE & L. SHEykO: 6 LARvAE; SOLWEzI REGION, MuTANDA FALLS, 12°24'S, 26°15'E, 10–12.VIII.2014, cOLL. N. KLuGE & L. SHEykO: 10 LARvAE.

Etymology. THE SPEcIfIc EPITHET REfERS TO THE uNIfORmLy GRAy cOLORATION Of THE mALE ImAGINAL AbDOmEN, WHIcH, uNLIkE OTHER kNOWN SPEcIES Of Ephemerythus , HAS NO WHITE OR cOLORLESS AREAS ( FIG. 30 ).

Descriptions. Larva. STRUCTURE. BITING EDGE Of mAXILLA RELATIvELy NARROW: INNER-DORSAL ROW, bESIDES TWO DENTISETAE, WITH 2 SETAE PROXImAD Of PROXImAL DENTISETA; INNER-vENTRAL ROW cONSISTING Of 4–6 SETAE; APIcAL TufT Of LONG SETAE cONSISTING Of 8–10 ARcHED ROWS ( AS IN E. niger – FIG. 9 ). FEmORA NOT WIDE; STOuT SPATuLATE SETAE LONG, ON fORE fEmuR fORmING IRREGuLAR TRANSvERSE ROW; fORE TIbIA WITH POINTED PEcTINATE SETAE ON INNER SIDE AND LONGITuDINAL ROW Of STOuT bLuNT SETAE ON ANTERIOR SIDE, WITHOuT STOuT SETAE ON POSTERIOR SIDE; mIDDLE AND HIND TIbIAE WITH POINTED PEcTINATE SETAE ON INNER SIDE AND TWO LONGITuDINAL ROWS Of STOuT bLuNT SETAE ( AS IN E. niger – KLuGE 2010A: FIGS 16– 17 ). HIND PROTOPTERA PRESENT IN mALE, AbSENT IN fEmALE. AbDOmINAL TERGA AND STERNA WITH SPARSE SImPLE SETAE, WITHOuT OTHER SOckETS (IN cONTRAST TO E. pictus ). TERGALIuS V WITH vENTRAL LObE; TERGALIuS VI PRESENT, WITHOuT vENTRAL LObE ( AS IN E. niger – KLuGE 2010A: FIGS 10–14 ).

CUTICLE COLORATION. NEARLy uNIcOLOR, OcHER OR bROWNISH.

HYPODERMAL COLORATION. HEAD AND THORAX WITH vARIAbLE mAcuLATION; fEmORA WITH ONE OR TWO WIDE, bROWN cROSS bANDS; TIbIAE WITH TWO bROWN cROSS bANDS ( FIGS 28–29 ). HyPODERmAL cOLORATION Of fORE PROTOPTERA, If PRESENT, EquIvALENT IN mALE AND fEmALE LARvAE, cONSISTING Of DARk GRAy-bROWN LINES cORRESPONDING TO LONGITuDINAL vEINS (buT NOT TO cROSS vEINS AND INTERcALARIES) ( FIGS 28–29 ; AS IN E. niger – FIGS 1–2 ). AbDOmINAL TERGA WITHOuT cONTRASTING mAcuLATION , AS IN ImAGO.

Subimago. CuTIcLE Of mESONOTum LIGHT bROWN, WITH cONTRASTING cOLORLESS, TRANSvERSE bAND; LONGITuDINAL, mEDIAN bAND POORLy EXPRESSED ( FIG. 27 ); cuTIcLE Of WINGS, LEGS AND AbDOmEN AT mOST PART cOLORLESS, WITH mIcROTRIcHIA AND mIcROLEPIDES ALSO cOLORLESS AND ScARcELy vISIbLE. HyPODERmAL cOLORATION AS IN ImAGO. PENIS SImILAR TO THAT Of ImAGO, buT WITHOuT SPINES ON APIcES Of PENIS LObES (I.E. INDISTINGuISHAbLE fROm THAT Of E. niger ).

Male imago. COLORATION AS IN FIG. 30 . FORE WING PROXImAD Of cOSTAL bRAcE DARkENED by GRAy-bROWN, OTHER mEmbRANE cOLORLESS. HIND WING DARkENED by GRAy-bROWN IN PROXImAL PART, DISTAL PART cOLORLESS ( FIG. 31 ). AbDOmINAL TERGA NEARLy uNIcOLOR GRAy, WITHOuT cONTRASTING DARk AND cOLORLESS AREAS ( FIG. 30 ). PENIS POORLy ScLEROTIzED AND NON-PIGmENTED; APIcES Of PAIRED PENIS LObES, SuRROuNDING GENITAL OPENING, bLuNT, DORSALLy WITH PAIR Of mINuTE, POINTED SPINES DIREcTED mEDIALLy ( FIGS 33, 35, 35 ).

Female imago. COLORATION AS IN E. niger ( FIG. 15 ). WING mEmbRANE NEARLy cOLORLESS, vEINS bROWN. HIND WINGS AbSENT. AbDOmEN LATERALLy AND vENTRALLy LIGHT OcHER, DORSALLy bROWN ( AS IN E. niger – FIG. 15 ).

Egg ( FIGS 37–38 ). AS cHARAcTERIzED fOR Ephemerythus (SEE AbOvE); LENGTH (EXcLuDING cAP AND TAIL) AbOuT 0.2 mm; TAIL LENGTH 0.04 mm. TAIL cONSISTING Of 3 cONIc PROcESSES, cOvERED by cOmmON, THIN ENvELOPE. SOfT ADHESIvE cORD PASSING bETWEEN THESE PROcESSES AND cONTINuING OuTSIDE TAIL.

Size. FORE WING LENGTH Of mALE AND fEmALE 6 mm.

Comparison. LARvA, SubImAGO Of bOTH SEXES AND fEmALE ImAGO Of E. nigricolor sp. n. ARE INDISTINGuISHAbLE fROm THAT Of E. niger . THE mALE ImAGO Of E. nigricolor SP.N. DIffERS fROm E. niger by THE PRESENcE Of A PAIR Of POINTED SPINES ON THE APEX Of THE PENIS ( FIGS 35–36 ) AND by THE AbSENcE Of cONTRASTING WHITE OR cOLORLESS AREAS ON AbDOmINAL TERGA ( FIG. 30 ). EGGS Of E. nigricolor sp. n. HAvE A TAIL cONSISTING Of SEPARATE PROcESSES ( FIGS 37–38 ), SImILAR TO E. pictus AND E. gilliesi , buT IN cONTRAST TO E. niger , WHOSE EGG TAIL IS AN INTEGRAL TubE.

Figures

FIGURES 27 – 31. Ephemerythus nigricolor Sp. n. 27, exuViae of left half of Subimaginal meSonotum; 28 – 29, female larVae of laSt inStar; 30, male imago (holotype); 31, itS hind Wing.

FIGURES 32 – 36. Ephemerythus nigricolor Sp. n., genitalS of male imago. 32, genitalS With focuS on Styliger; 33, genitalS With focuS on peniS; 34, firSt Segment of gonoStyluS; 35 – 36, peniS of tWo indiVidualS (Ventral VieW, denticleS on dorSal Side ShoWn by interrupted lineS, gonoductS ShoWn by dotted lineS) (32 – 35, holotype).

FIGURES 37 – 38. Ephemerythus nigricolor sp. n., eggS.

FIGURES 9 – 13. LarVae of Ephemerythus niger: 9, apex of maxilla (Ventral VieW, dentiSetae dotted, moSt part of Setae of apical tuft not ShoWn, area occupied by them ShoWn by dotted line); 10, maxilla of pen-penultimate inStar With deVeloping maxilla of penultimate inStar (focuS on inner-dorSal roW); 11 – 13, female larVae of laSt inStar from Amani. AbbreViationS: dS 1, diStal dentiSeta; dS 2, proximal dentiSeta; i-d, Setae of inner-dorSal roW.

FIGURES 14 – 17. Ephemerythus niger: 14, 15, reared male and female imagoeS from Amani (Tanzania); 16, I – VIII abdominal SegmentS of reared male Subimago from RiVer IShaSha (Uganda); 17, the Same of male imago from Mfumbi (Tanzania).

FIGURES 1 – 8. Hypodermal coloration of protoptera. 1 – 2, Ephemerythus niger, female larVa of laSt inStar: 1, hypoderm extracted from protopteron; 2, protopteron With cuticle and hypoderm. 3 – 8, Ephemerythus pictus: 3, female larVa of penultimate inStar; 4, female larVa of laSt inStar; 5, itS hind protopteron; 6, male larVa of penultimate inStar; 7, male larVa of laSt inStar; 8, itS hind protopteron.