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Coleoptera) and Itsphylogeneticsignificance Elytra, Tokyo, 35(2): 507-527, November3,2007 Nipponocyphon,aNewGenusof JapaneseScirtidae(Coleoptera) and itsPhylogeneticSignificance J ohn F. LAWRENCE CSIROEntomology,GPOBox1700,Canberra,ACT2601, Australia* and Hiroyuki YosHIToMI Bioindicator Co., L td. (Sapporo Branch), Kita 1, Nishi 2-11, Chuo-ku,Sapporo,060-0001Japan Abstract Nippor1oyp11on nakane1gen et sp nov., isdescribed fromJapan, and anewsupergenericclassificationofScirtidae isproposedbasedon cladistic analysesof 22scirtidgeneraandonegenuseach fromDerodontidae,Eucinetidaeand Decliniidae with 56 adult morphological characters. Nipponocyphoninae and Stenocyphoninae, subfam nov., are proposed based on the genera Nipponoyphon and Stenocyp11on, respectively. I nt roduct ion The family Scirtidae is a relatively large cosmopolitan family containing34 de- scribed genera, but the fauna is poorly known for any but theHolarctic region and phylogenetic relationships ofdescribed generaarepoorly understood. Except for the placement ofAmplectopusSHARP(seeDiscussionbelow),monophyly of the family has neverbeenquestioned,partlyduetouniquefeaturesofthemalegenitaliaandofknown larvae; however, in the recently described Stenocyphon sasaJii LAWRENCE, 2001 both male and female genitaliaexhibit a radically different structure. The discovery of an unusual scirtid-1ike beetle from the mountains of Honshu and Shikoku, Japan, stimu- latedtheauthors tocarefullyreconsider family limitsandrelationshipsamonggeneraof Scirtidaeand relatedgroups of basal Polyphaga. M aterials and M ethods The following abbreviations have been used for specimen repositories: ANIC - *Mailingaddress: 130 HartwigRd., Gympie,QLD 4570, Australia 508 Joh n F. LAWRENCEand Hiroyuki YosHIToM1 ,一 f , f , 、 . f ' . ' ,,-, - -. 一 ' f 11 Fig. 1. Nipponocyp/1on nakatlei sp nov., holotypemale. Photomicrograph digitally enhanced A ust ralian National Insect Collection; EUM - E him e University, Matsuyama; NMW- Natura1History Museum, Wien; NSMT - Natura1 Museum of Natureand Science, Tokyo; NZAC - N ew Zealand Arthropod Collection; SEHU - Systematic Entomology, HokkaidoUniversity - T. NAKANE Collect ion. Imagein Fig. 1wasenhanced using Auto-Montagesoftware version 4.00 (Synop- tics Ltd., http:/ /www.syncroscopy.com). Symbols used in measurements and ratios: TL=total length includinghead; BL= body length(excludinghead,PL十EL);PL=pronota11engthatmidline; PW=greatest pronota1 width; EL=elytra11ength along suture, including scutellum; EW=greatest elytra1 width. The termsmesoventrite and metaventrite have been used in place of mesosternum and metasternum followingLAWRENCE(1999). Wing vein terminology follows that of KUKALovA-PEcK and LAWRENCE(1993, 2004). NewScirtid GenusNipponocypho,1 fromJapan 509 Figs 2-11. Nipponocyphot1 ,1akanei sp nov., paratype, female; 2, head in ventral view; 3, labium; 4, mandible; 5, maxilla; 6, antenna; 7, prosternum;8, scutellum; 9, metendosternite; 10, mesoventrite and metaventrite; 11, setae and punctures onelytra. Nipponocyphon gen n o v Type species: Nipponocyphon nakane1 sp n o v . Description. Adult. Body (Fig. 1) moderately elongate and parallel-sided, some- what flattened, clothed with suberect hairs. Head moderately strongly declined but visible fromabove;eyesmoderately large,strongly protuberant, finely facetted;sides of head immediately behindeyesslightly inflated; transverseoccipital carinaabsent; ventral epicranial ridges well developed; supra-antennal carinae well marked but not produced 510 John F. LAWRENCEand Hiroyuki YosHIToMI over antennal insertions, which are slightly exposed; antennal fossae moderately well developed,eachextending laterally toedgeofeyebut not as wideasantennal insertion, cont inued ventrally as broad, subantenna1 groove; subocular car ina absent. F r ons barely sloping anteriorly; frontoclypea1 suture well impressed, slightly curved, with distinct tentorialpitsat eitherend; clypeusstrongly transverse,slightlywider anteriorly, sidesslightlyrounded,apextruncate. Ventralportionofhead(Fig 2) betweensubgena1 carinae flat to somewhat concave, except for gular area, which isslightly convex; gular sutures widely separated; corporotentoria1 bridge very broad. Antennae (Fig 6) relativelyshort, ifextendedposteriorly reachingjust beyondelytra1bases,moniliform to slightly incrassate, antennomeresspiculateand pubescent; 1 and 2 short and ovate, 1 slightly wider than2,3 elongate andslender, about 2.67X as long as wide, 4 slightly wider and abou t 2.OX as longas wide,5 to8progressivelyshorter and ofequal width, 9and10 about as long aswide, 11about 133X as longas wide. Labrum completely exposed, strongly transverse, about 0.37X as long as wide, sidesstrongly rounded, apexsubtruncate; tormaeshort and quadrate with acutemesal pr ocess. Mandibles (Fig 4) slightly longer than w ide at base, apex strongly and abruptly curved mesally and unidentate; basal half of outer edge with sharp dorsal carinadividingexposedsurface from that concealedbeneath clypeusand labrum;molae well-developed, asymmetrical, surfaces o f bo th ver y finely tuberculate. Prostheca well-developed, consisting of apical tuft of hairs and membranous lobe with surface hairs at molar end. Maxillae (Fig 5) with galea slightly expanded subapically and setose; 1acinia with inner edge lined with long setae and apex bearing hook-like, tridentateuncus; apicalpalpomerestronglyexpandedandsecuriform. Labium (Fig 3) withmentumtransverseand trapeziform; ligulastronglyexpandedapicallyandtruncate with internal longitudinal strut; apical palpomere attached at end of preapica1one, strongly expandedandsecuriform. Cervical sclerites well developed. Prothorax strongly transverse, about 0.5X as long aswide; sidesstrongly curved and explanate; anterior edge very weakly trisinuate, almost truncate; anterior angles rounded, not produced forward; posterior angles more or less right; lateral carinae completeand finely denticulate, without raisedmargin; baseslightly produced forming broad lobe,slightlyemarginateatmidline,withdistinctmarginobliteratedlaterally; disc veryslightly,somewhatunevenlyconvexwith narrow, slightlycurved, transversebasal groove joiningpair ofsmall, deep foveae. Prosternummoderately well developed, almost as long asshortest coxal diameter; anterior edgeslightly concave; intercoxa1process long,moderately narrow andparallel- sided,moderately archedbut notextendingbelow coxae,slightly expandedand truncate at apex andslightly overlappingmesoventrite. Procoxae transverse, subtriangular and strongly projecting, with w eak longitudinal carina ending before apex; trochantin narrowly triangular, exposed, broadly attached to endopleuron, which is slightly ex- panded apically w i th a weak anterior projection. Procoxa1cavities very broadly open internally and externally, with no traceof postcoxa1, notal projections. Scu tel lu m (Fig 8) subpentagona1, with apex somewhat rounded; anterior edge New Scirtid Genus Nippo11oyphon from Japan 511 1 m m CUA2 MP3+4 +CuA1 Fig. 12. Nipponocyp11on nakane1 sp nov., hindwing abruptly raised, straight, simple. Elytra elongate, 1.85-2.25X as long as wide, only slightly wider at base thanprothorax, parallel-sided for basal two-thirds, then gradually narrowed to conjointly rounded apices; humeri well-developed, lying just abovesharp carina extending from sides of scutellum t o elytra1 apices; epipleura n a r r o w and extending almost to apex; punctation (Fig. 11) seriate, each elytron with 10 puncture rows and scute11arystriole, each interval with additional puncture row. Mesoventrite (Fig. 10) stronglytransverse;sidesmoderately oblique; anterior edge wi t h pair of narrow, slightly cur ved and strongly elevated coxal rests; discrimen complete to base o f mesoventral process, anterior portion slightly widened forming narrow, shallow groove for reception of short keel lying above presternal process; mesoventra1 process short and acute not extending to metaventrite; mesepisternum sharplyelevatedanteriorly to form narrowprocoxa1rest;mesepimeronslightly shorter, separatedby deepgroove(pleuralsuture); mesocoxa1cavitiesconfluent, open laterally (partly closed by mesepimeron); internal meso-metathoracic joint membranous; meso- coxaeconical and projecting; mesotrochantinmoderately well-developed and exposed, elongate. Metaventrite slightly transverse, about 0.75X as long as wide, slightly convex; discrimen complete to base of metaventra1process; transverse (katepisterna1) suture well developed,extendingoneach side to about middleofmetacoxa; metanepisternum subrectangular, about 3.5 times as longas wide; metepimeron not visible. Metacoxae moderately large, only slightly oblique, extending laterally to elytra1epipleura; meta- coxa1plate completebut morewell developed mesally. Metendosternite (Fig 9) with longstalk,moderatelylongarms,well-developedventrolateralprocesses,longbutbroad anterior process and well separated anterior tendons. Hind wing (Fig. 12) about 2.25 timesas longas wide; apical fieldabout 0.25 times total wing length, with threebroad pigment patches and anarrower, longitudinal one crossingr4; radial cellsubtriangular,shorter than broad, its lumenentirelyobscured by pigment, which extends beyond the cell basally and posteriorly; cross-vein r3 short, slightlycurved,arisingseparately fromr4,which isstronglycurvedandcomplete;basal portion of RP very short and straight; radio-medial loop broad; medial spur straight, 512 Joh n F. LAWRENCE and Hiroyuki YosHIToMI almost reachingwingmargin,wherethereisaslightembayment;medial fieldwith4free veins, MP3+4十CuA1, CuA2, AA3 and AA4, the last of which extends to anal
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