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Djvu Document Vol. 6, No. 3-4, September - December, 1992 145 Variation in the terminalia of Neoherrnes conc%r with a key to males of Neoherrnes in eastern North America (Megaloptera: Corydalidae: Chauliodinae) David E. Bowles United States Air Force Armstrong Laboratory Occupational Medicine Division, Environmental Biology Branch 2462 East Drive, Brooks AFB, Texas 78235 and Midiael L. Mathis Department of Biology University of Central Arkansas Conway, Ai'kansas 72035 Abstract MalesofNeo.hermes oonoolor(DaviS)fiOll1 theinteriorhighlandsofArkansas,Oklahoma, andMissouri, and from Illinois, Indiana, andKentucky exhibited considerable variation inmale terminalia. Differences occurred in the size Of the dorsal membrane Of the ninth sternite and inthe shapeofthe tenth tergite (anal plate)which variedfrom roundedtotruncate shaped. Thisobsel"ledvariationdoesnotappeartabegeographieallyOOlT(llated. Females ofN. ronroliJr didnoteXhIbIt broadvariatIOn m terminalia. Littlevariationwasobservedamongmales ofN. angttstioollis (Hagen) and N. matheri Flint. The broad range of'lariation obsep."ed in the terminalia ofN. ronroliJr could result in mISIdentification bY collectors who rely orily on the shape ofthe anal plate rather than the more constant shape ofthe aedeagus Introduction this species include springs, seeps, and small, low­ The genus Neohermes (Megaloptera: Corydal gradientwoodlandstreams. Pupaeofallthreespecies idae: Chauliodinae)isrepresentedbythreespeciesin eastem North America, Neohermes angusticollis conco~r m as unty, SSOurI; e ter­ minalia Of this specimen differed substantially from mesmat n n. egenuscon 8lllS0 y omore species from 'western. North Ameriea that form a othermalescollectedfrom thesameregion andprevi- group quite distinct from the three eastern species ouslyillustratedspecimensofthe species (Flint 1965, (Flint 1965). Of the eastern species, only N. oonoolor :1m~ ~:~~o~-;:@::::t~::=~e:n~ is widely distributed, occurringthroughout the east- ::e: em Umted States (T8.rler et 81. 1976). Neohermes Arkansas that showed a broad range ofvariation in angusticollis is known only from Georgia and South terminalia, including characters similar to those of Caroli1i8 (Flint 1965, Tarteret al. 1976); N. matheri the Missouri specimen as well as tire commonly has been reported only from Mississippi (Flint 1965, illustratedform ofthe species. We also examinedtwo Stark and Lago 1983). Distributional records for all non-typical males from Kentucky, but males from three species are limited because they are infre- ~~~:::::=.:::~==Zit{~:~~; quently collected. Tarter et al. (1979) described the larval form ofN. concolOr. TYPiC8I larval habitats of 146 Insecta Mundi ;In ~ /\ 3 4 (}'"' \\ I )/ \ ) ~dm f' \ {/\ I \ / v v '\ - , \ " , '\ - '"", ( 3/ _' -- 'f E \~ Figures 1-13. 1-5. Noohermes oo1WfJlor. 1 3. Male tenninalia. 1. Dorsal, 2. Ventral, 3. Lateral. 4. Aedeagus, dorsal. 5. Femaletermmaha, lateral. (ae=aedeagus, ap - analplate(tenthtergite), elm =dorsal membraneofninth stemite). 6- HI AnalplatesOfmaIeN oonoolOrfiOm dift'erent ll'ElOl!'1"aphic locations sllOWing abroadrangeOfYariation. AIl'Jiews are dorsal. 6. LatimerCo., Oklahoma, 7. LatimerCo., Oklahoma, 8. NelsonCo., Kentucky, 9. PulaskiCo., Arkansas, )1 I Garland«)O ,Arkansas 11-13 Termiiialia ofmaleN conoolOrfrom PulaskiCo , MiSsouri shOWing rounded anal plates and expanded dorsal membrane ofninth stemite. 11. Dorsal, 12. Ventral, 13. Lateral. in Northern Missouri did not have atypical termin· (NMNH), and University of Arkansas Arthropod alia. Museum (UAAM). Other specimens of It''. wncolor Variationinterminatiaamongma!esofN.oonrolor examined by us are deposited in the Florida State hasbeennotedpreviously(Flint 1965), butnodetails Collection ofArthropods (FSCA). regarding the degree Of variation were proVided Herein, we illustrate the terminalia of the three Results eastern species of Neohermes, including some ofthe variationobservedinmalesofN.oonoolor. Akeytothe The commonly illustrated form. of N. oonoolor, malesofNeohermesspeciesofeasternNorthAmerica includingfemale terminalia,isshowninFigures 1·5. a)so is proVided Terminalia, as used bere, includes elements of the We examinedmaterialfromthe ClemsonUniver- ninthandtenthabdominalsegments. Primarydiffer­ sity Entomological Collection (CUBC), Illinois Natu ences among specimens Of N ooncolOr examined rat History Survey (INHS), North. Carolina State (n=32) include the shape of the anal plate (tenth University Entomological Collection (NCSU), Texas tergite) and: size ofthe dorsalmembrane oftheninth A&M University Entomological Colleet,ion (TAMIl), st.ernite (Figs. 6-13). Anal plate shapes ranged from United States National Museum of Natural History roundedto acutelytruncate atthe distal end(Figs. 1, Vol. 6, No. 3-4, September - December, 1992 147 tf\~ ,~ "''''' '\ fi'~'~9": II I \~~'/ "I)t--\l ~ ,!' I' ,\\ I": i\ 1/' " , ., ":,YI/;;/j JI~~\\!I'~ I ,: \ ( I .. '" .... ~I:\ l"-~'~~ ...... /' J \I X'_ .. Y I '" \ ( / \ ') J r~ ~ \I r I "\... _J v \.Y I \ .!I\ 17 18 / ,','I. ' 19 / \ "I / \ (\ \....) \.//\ \.. , \. ... ·r ". \ / v \/ Figures 14-19. 14-16. Neohermes angusticollis, male temunaI1a. 14. Dorsal, 16. Ventral, 16. Aedeagus, dorsal. 1'1-19. Neohermes matheri, male tenninalia 17 Dorsal, 18 Ventral, 19 Aedeag'llS, dorsal 6-11) In addition, the size ofthe dorsal membraneof theaedeaguswasconsistentamongthespeeimenswe theninthsterniterangedtromnon-apparent(FigS. 2- examined thus allowing these three species to be 8) tD greatlyexpanded(Figs. 12-13)Minordifferenees distinguished Also, the alTangement of shorL, dark were observed in the shape ofthe aedeagus among setae on the mesal face ofthe anal plate was consis- specimens, buL Lhey were so slighL as noL to warranL tenLly different among the three species. Approxi­ illustrating. Little variation was observed amongthe matelyone-halfofthe N ronmlormalesweexamined female specm1ens (n-22) (Fig. 5). No substantial had expanded membranes. This condition was ob"' difi'erenees in terminalia ""'ere observed among the ser\'edinsame live specimens andisnotattributable male N. angusticollis (Figs. 14-16) or N. matheri to preservation in alcohol. Expanded membranes (Figs. 17-19)ex811lilled (n-7,n-2,respectively). How­ were noL observedamongspecimens ofthe othertwo ever, we saw only a few specimens of these two species spec:1es, from limited geographic locations. 1'he differences we obServed in the termin8lia of N. ooneolor did not appear tD be geographieally Discussion correlated. However, most of the specimens we TheSlgnificantV8rJ.8tionmthemaIeterminaliaof exanuninedwerecollectedfronltheinteriorhighlands. N oonoolor that we examined could result in oon..fu- Specimens from additional areas outside the interior sion with either N. angustioollis or N. matheri, par­ highlands may show smularV8rJ.ation to be ticularly for collectors unfamiliarwith: these insects. widespread.ThesamemaybetruetorN. angustioollis The rounded anal plates of some N. ooncolor could andN. matheri. The phylogenetic significance ofthe result in confusion with: N. matheri. Likewise, the observed ~ariationin N. concowr is not clear at this broadly truncate anal plates of some males could be time. However, N. ooncolor clearly demonstrates a confusedwithN. angustloolz"s. However,theshapeof 148 Insecta Mundi broadphenotypic plasticity withregard to the shape Webb, 6 males, 1 female (INRS). INDIANA. Monroe althe male termina1ia Co: Bloominghm, 14July 1961,D. Lxkwood, 1 male (TAMU). KENTUCKY. NelSOn CO.: B8.i'dSt0wn, 19 June1971,A.Brower,1male(NMNH). BoydCo.:July Taxonomic Comments 1972, W. Watkins, 1 male (NMNH). MARYLAND. ThElthreeeastemspeeiesOfNeohermesarereadily Prince Georges Co.. College Park, 2 June 1966, L. distinguish.edbytheshapealthaaedeagus.Likewise, Deitz. 1 female (NCSU~MISSOURI. Pulaski Co.: thearrangementofshort,clarksetaeonthemesalfaee of the anal plate is different in each species. In N. oonrolor, these setae occupy a nanow band running the entire length Of the anal plate. The setal arrangement of N. matheri differs from that of N. SW, 9-15May1988,K. Stephan, 1 female (FSCA); 11­ concolorbyoeeupyingonlytheposteriorthree-fourths 25June 1988;K Stephan.6niales, 5 females(FSCA), ofthe mesal face ofthe anal platewiththe setalband widening near the tips. In N. angustirollis, these setae are restricted to the tips Of the anal plate Key to the adult male Neohermes Material Examined of eastern North America (modified from Flint 1965 and Stark and Lago 1983) ...VeohermesangusticoUis. USAGEORGIA. Dekalb Co.: Atlanta, 19June 1946,P. Fattig, 1male,1 female L (NMNH), Brookhaven,7June1953,G. Meid; 1 female (NMNH); Emerson, 14June 1940, P. Fattig, 1 female (NMNH). MOrgan Co.: Hard L8.1:lOr Creek st. Park, Hard. Labor Creek, 16 June 1969, Peters, Tsui, towards tips (Fig. 17) N. matheri Pescador, and Jones, 1 male (NMNH). SOUTH I'. Aedeagus and analplatesotherthanabove (Figs. 1- CAROUNA: Greenville Co.: Greenville, 17-22 June 4.6-16) 2 1968, P. Carlson, 1 male, 1 female (NMNH). Pickens Co.: Clemson, 7 .June 19M, J BrnshWein, 1 male 2. Aedeagus with deep basolateral excisions; tip with (CUEC),19June1984,W. English, 1male(CUEC),25 slightmesalexcision(Fig. 4);analplatesvariable in June 1986, D. Dunavan, 1 male (CUBC); Charleston shape(Figs. 1,6 ll),shorldarksetaeoecupying a narrow band along entire mesal face of anal Co.. Charleston,29October 1983. P. Edwards, 1male plate /!I.r • oo1'/;()()lor (CUEC). 2'. Aedeagus with shallow basolateral excisions (Fig. N. matheri-. USA MISSISSIPPI Claiborne Co • 16); tip with deep, V shaped nart"O"N mesal
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