fAOZ LIBRARY A. BEDOS & L. DEHARVENG JAN 2 1 1992 UniversitéPaulSabatier, Toulouse, France HARVARD CEPHALACHORUTES GEN. N., A NEW GENUS (jfiNiVERSlTY TROPICAL NEANURIDAE (COLLEMBOLA) Bedos, A. & L. Deharveng, 1991. Cephalachorutes gen. n., a new genus of tropical Neanuridae (Collembola). -TijdschriftvoorEntomologie 134: 145-153,figs. 1-22,tabs. 1-2. [ISSN0040-7496]. Published 18December 1991. Cephalachorutes,anewgenusofNeanuridae(Pseudachorutinae)Collembola,isdescribed with fivenewspeciesfromSoutheastAsia (Casiaticussp. n.,C.barthaesp. n.,C. caecus sp.n.,C.centurionissp.n.,C.pestilentiaesp.n.)andonenewspeciesfromPapua-Niugini (C murphyisp. n.). In addition,threespecies fromAfricadescribedinArlesia,andone speciesfromNepaldescribedinPseudachorutellaaremovedto Cephalachorutes. Correspondence: A. Bedos and L. Deharveng, Laboratoire de Zoologie, Ecologie des Invertébrés terrestres, UPR CNRS 8491, Université Paul Sabatier, 118 route de Nar- bonne, 31062ToulouseCedex,France. Keywords. -Collembola,Neanuridae,tropicalforest. Collections of forest soil fauna from Southeast Description ofthegenus Asia frequently contain small Pseudachorutinae (Neanuridae, Collembola) ofunusual habitus, i. e. Small size: 0.4 to 0.9 mm. Colourblue to white. with short andwidebody and head. Following the Body short and wide (about halfas wide as long), classical work of Massoud (1967), these species juvenile-like (fig. 1); 6th abdominal segment re- would have tobeplaced ineitherArlesia or Pseu- duced. dachorutella,accordingtothenumberoftheireyes. Antennae(figs.2-4).Antennaeshortandstocky; More detailed morphological studies show, how- ant. Ill and ant. IV fused dorsally. Ant. IV with ever, that, apart from their peculiar habitus, these apical papilla reduced, either indistinct or simple formsshareasetofuniquecharacterswhichjustify (sometimes feebly trilobed), always fused to the to isolate them in a new genus describedbelow. apex of the article; organite 'or' globulous, in a The terminology used is that of Deharveng ventro-apical position; seven well developed, (1983) forantennaeandtibiotarsi;labiumsetaeare thickened S-setae on ant. IV (SI to S4, S7, SB and namedafterMassoud(1967);dorsalsetaearenum- MS); S7 much enlarged, overhanging the apex of bered after the row-system (Cassagnau 1974); ant. IV; S4 usually larger than other S-setae but however, the neanurian nomenclature of Dehar- smaller than S7; no s-microchaeta, MS as deve- veng (1983) isusedwhenprecisesetalhomologies loped as other S-setae. The ant. Ill organ has are uncertain (th. II-III). moved to ventral side, with its guard-seta S5 Abbreviationsusedinthedescriptions: abd.,ab- shifteddistallytowardsS8ofant.IV;S3closetoS2. dominal segment; ant., antennal segment; d/m, Ant. I with 7 setae. ratio dens/mucro; S-setae, setae of type 'S'; th., Head (figs. 7,9-12). Postantennalorgan absent. thoracic segment. 8+8to0+0eyes.Buccalconeshortandwide.Lines Thematerialisdepositedinthecollectionofthe ofsetaeA-B andC-Don labium arrangedmoreor LaboratoiredeZoologie,Université PaulSabatier, lessperpendicularly.Labrumdistallyenlarged,like Toulouse, France (leit) and in the Museum Na- planaria-head. Labral chaetotaxy 4/3,4,2 with the tional d'îiistoire Naturelle of Paris, France 2 setaeofthedistalrowandthelateralsetaeofthe (mnhn). ante-distal row longer than others. Maxilla very thin, needle-like. Mandible thin, with2 strongba- sal teeth and a distal comb of 4 to 12 small teeth Cephalachorutesgen. n. (the 2 apical ones sometimes slightly larger). Typespecies:Cephalachorutesasiaticussp.n.(bypresent Tergites (fig. 14). Ordinary setae very short. S- designation). setaeverylongandthin,shorteronabd.IV.S-setae 145 TijdschriftvoorEntomologie,volume 134, 1991 3+3setae.Furculawelldeveloped,tenaculumwith 3+3 teeth, dens usually with 6 setae (only 3 setae in C. microphthalma); mucroabouthalfaslongas dens, simple, similar to that of Pseudachorutes parvulus. Derivationominis.-Thisgenusiscalledafterits unusually large and wide head (from the Greek noun kephale = head). Gender of the genus is masculine. Discussion ThedefinitionofCephalachorutesreliesprimar- ilyontheuseofantennalchaetotaxy,whichappears onceagainasanefficienttaxonomietoolatsuprage- neric level in Neanuridae (Deharveng 1983). AmongPseudachorutinae,Cephalachorutesgen. n. shares withArlesia Handschin, 1942 and Pseu- dachorutellaStach, 1949(sensuMassoud 1967)the following characters: postantennal organ absent, maxilla styliform, and mucrodens well developed. Like the species of Arlesia sensu Massoud, the CephalachorutesspecieshavetheirsetaMSofant. IV of large size, whereas it is reduced to a micro- chaeta in most Pseudachorutinae and intheprim- ,-\ itivefamilyHypogastruridae.Inthetypespeciesof thegenus Pseudachorutella (P.asigillata), this seta is also a microchaeta. Fig. 1. HabitusofCephalachorutesbarthaeasanexam- Cephalachorutes is easily differentiated from pleofthegenus. Length: 0.5 mm. Arlesia and Pseudachorutella by the characters listed in tab.l. These last genera, formerly differ- entiated by the number of eyes (8+8 in arrangedafterthestandardhypogastrurianpattern Pseudachorutella, less in Arlesia, after Massoud (2+ms,2/1,1,1,1,1 oneachhalf-tergitefrom th. II 1967), cannot be separated any more on this to abd. V). ground as the species Arlesia variabilis Thibaud Sternitesandbodyappendages (figs. 18, 19,21). andMassoud, 1983has8+8to5+5eyes.Infact,the 1-2 + 1-2 setae on abd. II sternite. Tibiotarsal complexArlesia-Pseudachorutella, which includes chaetotaxy: 8+11, 8+11, 7+11, or 7+11, 7+11, a number of unrelated lines, has to be completely 6+11 whenthesetaMisabsent.Ventraltubewith revised. Table 1. MorphologicaldifferencesbetweenCephalachorutesandArlesia/Pseudachorutellacomplex. Cephalachorutes Ariesia/Pseudachorutella Size less than 1 mm usuallymorethan 1 mm Habitus shortandwide longandrelativelynarrow Ant. IVapicalpapilla fusedtotheapex notfused,trilobed Positionofant. IVorganile"or" ventro-apical dorso-apical S7 (andoftenS4) ofant. IVvsother thicker notthicker S-setae (figs. 3, 5) S2-S3ofant. Illorgan ventral external Ant. Ill: S2 lengthvsS2-S3 distance S2> [S2-S3] S2< [S2-S3]* (figs.4,6) Labrumshape likeplanaria-head different LineoflabialsetaeC-D (figs. 7&8) moreorlessperpendiculartoA-B paralleltoA-B Mandible 2 bigbasalteethandadistal different combof4-12 smallteeth * observedinArlesiaalbipesandinPseudachorutellaasigillata. 146 Bedos&Deharveng: Cephalachorutes Some of the synapomorphies which define Ce- 3. C. barthae sp. n.;Thailand. phalachorutes are unique among Pseudachoruti- 2. C. caecussp. n.; Thailand. nae. They are the habitus, at least in the most 1. C. centurionis sp. n.; Thailand. evolved species, the fusion ofapical papilla to the 5. C. murphyisp. n.; Papua-Niugini. apexofant. IV,thepositionoftheant. IVorganite 4. C.pestilentiae sp. n.; Thailand. 'or' (which has migratedbeyond the apical papilla ontheventralsideofthearticle),thehypertrophy ofS7 andS4onant. IVandthelabrumshape.The Arlesia pillaii Prabhoo, 1971 from India might arrangementofthedistalsetaeoflabiumissimilar belong to Cephalachorutes, but its description is to thatofKenyuraSalmon, 1954, indicatingpossi- insufficient. blerelationshipsbetweenthetwogenera.Theven- Distribution, ecology tral position of ant. Ill organ is also observed in othergenera,butinadifferentway. Itislikelythat Cephalachorutes occurs in Africa, tropical Asia othercharacterswillprovetobediscriminant,such andPapua-Niugini,but notintropicalAmerica. It as themaxillaarmsstructure (figs. 12, 13),buttoo is a rather frequent inhabitantofforest soils from few species are known in this respect. sealevelup to3,500 m. Species with4-8+4-8eyes were collected from litter, whereas those with re- Characters used in the descriptions ofspecies duced eyes were mostly found in humus and soil. In addition to the characters, which are tradi- Keyto world species ofCephalachorutes tionally used for the taxonomy of Pseudachoruti- nae, the following chaetotaxic characters were Additional characters for the species not redes- found to vary between species: cribed in this paper aregiven inbrackets. - setac3 on head - number ofdorso-external setae on th. II and th. 1. Dens with 3 setae C. microphthalmus^ Ill [3-5+3-5 eyes, traces of pigment, claw un- - seta a2 on abd. IV toothed, distal comb of mandible with 8-10 -setaal onabd.V: 2+2 (al present) or 1+1 setae small teeth] (al absent) between - S-setae - Dens with 6 setae 2 M - seta on tibiotarsus 2. 8+8 eyes 6. C. asiaticus sp. n. In the literature, the number of S-setae on ant. - Less than 8+8 eyes 3 IV is statedtovarybetweenspecies,but this is in- 3. 5+5 eyes 4 correct: there are always 7 S-setae on this article, - Less than 5+5 eyes 6 butusually thethinnesthavebeenoverlookedand 4. Distal comb of mandible with 4 small teeth setaS5 ofant. Ill hasbeencountedas anant. IVS- C. minimus seta. [pigmentpresent,clawuntoothed,description Someofthechaetotaxicdifferencesillustratedon unreliable forchaetotaxy] figs.15-17mightratherbeindividualvariationthan - Distal combofmandible with more teeth 5 realinterspecificdifferences: arrangementofsetae 5. Seta a2 presenton abd. IV 7. C. nakaoi isoftenvariableon head and tergites (particularly - Setaa2absentonabd.IVafteroriginaldrawings on abd. VI), with frequent asymmetries. C. delamarei Countingthe numberofeyes is anotherserious [pale pigment, claw usually untoothed, some- difficulty for species identification in Cephalacho- timesclawIwithtooth,distalcombofmandible rutes. Observation is easier if animals are treated with 11-12 small teeth] by KOH before clearing. 6. 4+4eyes 7 - Noeyes 9 Check-list of Cephalachorutes 7. 1+1 setaebetweenS-setae on abd. V - C. minimus (Massoud, 1963) comb. n. (from 5. C. murphyisp. n. Arlesia); Angola. - C. delamarei (Murphy, 1965) comb. n. (from Note^:HerecouldbeplacedArlesiapillaiiPrab- Arlesia); Gambia. hoo, 1971: 4 setae on dens, G-^G eyes, pigment 7. C.nakaoi(Yosii, 1966)comb.n. (fromPseuda- present, claw with tooth, distalcomb of mandible chorutella); Nepal. with 5-6 small teeth, S7 and S4 both thickened; - C. microphthalmus (Barra, 1969) comb. n. however,thefollowingcharactersgivenintheorig- (fromArlesia); Gabon. inaldescription are notconsistentwith thedefini- 6. C. asiaticus sp. n. (type species of the genus); tionofCephalachorutes:4+4setaeonventraltube Thailand, Indonesia, Philippines. andonly one bigbasal tooth on mandible. 147 TijdschriftvoorEntomologie,volume 154, 1991 Figs. 2-13. Differentialcharactersonheadbetween Cephalachorutes andArlesia. - 2,Apexofant.IV in C. barthae (ventralside,rightantenna; ap: apicalpapilla;or: organite;circles; socketsofsetae); 3,Ant.III-IVofC. centunoms (dorsalside,rightantenna;S-setaeandsocketsofordinarysetaeofventralsideindots);4,Ant.IIIorganinC.barthae (ventral side, right antenna); 5, Ant.III-IV ofA. albtpes (dorsal side, right antenna); 6, Ant.III organ inA. albtpes (ventral side, right antenna); 7, Labium in C. centurionis; 8, Labium in A. albtpes; 9, Mandible of C. caecus; 10, Mandibles of'C. barthae; 11, Labrum in C. barthae; 12, Structureofmouthparts in C barthae (c: cardo; f: fulcrum; st: stipa; md: mandible); 13,Structureofmouthparts inA. albipes. Scales: 10 n (figs. 2, 9-11), 25 M (figs. 3-8, 12), 50M (fig- 13). 148 Bedos& Deharveng: Cephalachorutes - 2+2 setae between S-setaeon abd. V 8 4.vii.1985, Deharvengleg.,sampleDC 56; 1 femalejuv., 8. 3+S dorso-external setae on th. II and th. Ill 3juv.,ibid,500m,wetlitterinforest,17.xii.l980,Dehar- 3. C barthae sp. n. veng leg.,sampletha4 (otherspecimens in alcohol); 1 - 2+S dorso-external setae on th. II and th. Ill hfeummaules,iCnhfioarensgt,M1a4i.vipi.ro19v8i5n,ceD,ehDaoirveMnageaTnhdo,Bed1o3s00lemg.,, M4. C.pestilentiae sp. n. sampleCL 11 (4 inleit,2 inmnhn). 9. Tibiotarsus with seta 1.MC. centurionissp. n. Description - Tibiotarsus without seta 2. C caecus sp. n. Length0.55-0.65mm.Ratiolength/width=2.2. Pigment absent. 1. Cephalachorutescenturionis sp. n. Antennae. Ant. IV with apical papilla slightly (figs. 3, 7, 14) knobbed, fused to the apex; S7 large, fairly thicker than S4; other S-setae thinner and rather long. Type material. - Holotype, female, Thailand: Chiang SetaeS2andS5ofant.IllaresubequaltoS8ofant. Mai province, Doi Inthanon, 2550 m, soil in primary IV; on ant. Ill,S2 is4.5 times as long as S3. forest, 1.vi.1989, Deharveng and Bedos leg., sample CM Head. Noeyes,noocularspotsofpigment. Seta 4spra(imlmpealirte)y.CfM-oreP6s;atr,2a9tm.y1ap.le1es9s,8,1T,2hGafoielumazanelde:sle,g1.2,msajaulvme.p,,lie1bsifdTe,mHhaAluem9,u3siabiniddn, cc3omabbseonftm.anMdoiubtlhepawrittsh8t-yp9iscamlalolftteheeth,getnhues2;adpiisctaall THA94 (7 inLEIT,2 inmnhn). ones relatively stronger. Tergites.Onth.IIandth.Ill,3+Sdorso-external Description setae. On abd. IV, a2 absent. On abd. V, 2+2 ordi- Length0.48-0.68mm.Ratiolength/width=2.3. nary setaebetween S-setaeM. Body appendages. Seta absenton tibiotarsus. Colour whitish sometimes with slight traces of Claw without tooth. Dens with 6 setae. Mucro greAyntpeingnmaeen.t.Ant. IV with apical papilla entire, more than halfas long as dens (d/m = 1.8-1.9). fused to the apex; S-setae large and thick; S7 ba- nana-like and larger than others,overhanging the Derivatio nominis. - This species is named for theabsenceofeyes(fromtheLatinadjectivecaecus apexofthesegment;S4smallerthanS7butlarger = blind). than other S-setae. Setae S2 and S5 of ant. Ill sasubleoqnugalastoS3S.8 ofant. IV; on ant. Ill, S2 is 5 times Discussion.-C.centurionisandC.caecusarethe Head.Noocellivisible,butsometimes 1+1 min- oalnsloytshpeecmioesstofdetvheelgoepneudsSd-esveotaiedoonfeaynets..ITVheanydhaanvte. ute black ocular spots. Seta c3 absent. Mouthparts typicalofthegenus; distalcombofmandiblewith III. They differ by the size of 2 apical teeth of the 9-10 small teeth. distalcombofthemaMndible(strongerinC.caecus), setTaeer.giOtnes.abOd.nItVh,.IaI2aanbdsetnh.t.IllO,n3+aSbdd.oVr,so2-+ex2teorrndail- tahbesetnitbiiontarCs.alcsaeetcaus) a(npdrestehnetriantiCo.dceennstu/rmiuoncirso, nary setae between S-setae. (higher in C. centurionis). M Bodyappendages.Seta presentontibiotarsus. Claw withouttooth. Dens with6setae. Mucroless than halfas long as dens (d/m = 2.1-2.3). 3. Cephalachorutesbarthaesp. n. (figs. 1,2,4, 10, 11, 12, 19) Derivarlonominis.-Thisspeciesisnamedafter our friend Alain Gouze, firemen officer, who col- MaTiyppreovmiantceer,ialD.oi-MHaoelotTyhpoe,,1m3a0l0e,mT,haiinlalnitdt:erCfhoireasntg, Lleacttiendntohuenfirisntgsepneictiivmeencsasoefctehinstusnpeoci=esc(ofmrmoamntdh-e (1L4.EIvTii)..19-8P5a,raDteyhpaesr,veTnhagilaanndd:Be1dfoesmalleeg,.,sasmaempslaempClLe;171 ant). male, 2 juv., ibid, sample CL 18; 1 female, Chiang Mai province, Doi Inthanon, 2500 m, humus in primary Discussion. - Cf C. caecus. forest, 2.i.1981, Deharveng leg., sample THA 72; 1 juv., ibid,2000 m, humus inprimary forest, 2.1.1981,Dehar- veng leg., sampletha 77; 2 juv., ibid, 1700 m, litter in 2. Cephalachorutescaecus sp. n. primary forest, 1.vi.1989, Deharveng and Bedos leg., (fig. 9) samplecm 34 (5 inleit,2 inmnhn). Type material. - Holotype, male juvenile, Thailand: Description Cfohrieastn,g4M.VaÌiÌ.p1r98o5v,inDceeh,aDrovienCghilaegn.g,sDaamop,l9e5D0Cm6,7h(ulmeiuts).i-n Length 0.55-0.70 mm. Ratio length/width = 2. Paratypes, Thailand: 1 juv., ibid, 1000 m, soil in forest. Colour blue. 149 TijdschriftvoorEntomologie,volume 134, 1991 r \ v\ 14 ^ 1 N^^ \>^,/ ' ^ \ / / /^. p3 15 p3 16 xX ^ ^^ ^ ^ ^ y\ De A« M '/ t , \. ^ / /p3 i \_^/ Ä 'tl' \. 'f ?• .S. ^ f f r ^ ' Î •^ -m> t/ ^5 ^ V- / /1 .'; r ^ 19 >i t ' ï'r /^-< "V-T.-*' l..?A'^ a1 yöi1 1'^ 22 a2 "^"^'A' , >/' Figs. 14-22. DifferentialcharactersbetweenspeciesofCephalachorutes.- 14,DorsalchaetotaxyofC.centurionis; 15, OcularareaofCpestilentiae; 16,OcularareaofC. nakaoi; 17,OcularareaofC.asiaticus; 18,ChaetotaxyoflegIIin Casiaticus (ventralside;dottedcircles: socketsofdorsalsetae); 19,VentralchaetotaxyofC. barthae;20,Abd.IV-VI ofC murphyi;21,MucrodensofC.asiaticus;22,Abd.III-VIofCasiaticus.Scales: 10m (figs- 18,21),25 m (figs. 15- 17),50M (figs. 14, 19,20,22). 150 Bedos&Deharveng: Cephalachorutes Table2. DifferentialcharactersbetweenC. barthae, C.pestilentiaeand C. murphyi. bartha pestilentiae murphyi Body length/width 2 2 2.3 Setac3 on head absent present absent Dorso-externalsetaeonth. II-III 3+S 2+S 2+S Setaa2 onabd. IV absent present absent Seta al onabd. V present present absent Antennae. Ant. IVwithapicalpapillaentirebut 2+2 ordinary setae between S-setae. M knobbed, fused totheapex; S-setae rather thin,S4 Body appendages. Seta absenton tibiotarsus. andparticularlyS7 thicker.SetaS5 ofant. Illshor- Clawwithaminuteinnertooth.Denswith6setae. terthanS8ofant.IV;onant.Ill,S2 subequaltoS5 Mucromorethan halfas longasdens (d/m= 1.7- and 3 times as long as S3. 1.8). Head. 4+4eyes,sometimes notobvious.Setac3 absent. Mouthparts typical of the genus; distal Derivatio nominis. - The name of the species combofmandible with 8-10 small teeth. refers toits type locality,adolinewithaveryhigh Tergites.Onth.IIandth.Ill,3+Sdorso-external level of carbon dioxide up to 5% (from the Latin setae. On abd. IV, a2 absent. On abd. V, 2+2 ordi- noun ingenitive casepestilentia = bad air). nary setae between S-setae. M Body appendages. Seta absent on tibiotarsus. Discussion. - Cf. C. murphyi. Claw with a minute inner tooth, sometimes indis- tinct. Dens with 6 setae. Mucro more than halfas long as dens (d/m = 1.7-1.9). 5. Cephalachorutesmurphyisp. n. (fig. 20) Derivatio nominis. - This species is named to Type material. - Holotype, female, Papua-Nuigini: thank Florence Barth for her drawing of the Ce- Wau, Bulldog road, 2600 m, in litter of moss forest, phalachorutes habitus (fig. 1). l.xii.1979, Deharveng leg., sample png 266 (leit). - Paratypes, Papua-Nuigini: 1 male, 1 female, Wau, Bul- Discussion. - Cf C. murphyi. ldogroad, 2630 m. Rhododendron litter, l.xii.l979,De- harvengleg.,samplepng 263 (leit). 4. Cephalachorutespestilentiaesp. n. Description (fig. 15) Length0.75-0.90mm.Ratiolength/width=2.3. Colour blue. Habitus less thick-set than the other Type material. - Holotype, female, Thailand: Chiang Maiprovince,northofBanMuangNgai,600m,litterin speciesofthegenus.Abd.VInothiddenunderabd. forest, 4.VÌ.1989, Deharveng and Bedos leg., sample CM V. 59 (leit). -Paratypes,Thailand: 7 females,2 juv.,same Antennae. Ant. IV with apicalpapilla knobbed, sample (numerousspecimensinalcohol) (7 inleit,2 in fused to the apex; S4 and particularly S7 thicker MNHN). thanotherS-setae,whicharelongandthin.SetaS5 Description ofant. Ill halfas long as S8 ofant. IV; on ant. Ill, S2 slightly longer thanS5 and less than 3 times as Length 0.70-0.85 mm. Ratio length/width = 2. long as S3. Colour blue. Head.4+4eyes notwelldistinct.Setac3 absent. Antennae. Ant. IV with apical papilla knobbed, Mouthparts typical of the genus; distal comb of fused to the apex; S4 and particularly S7 thicker mandible with 9-10 small teeth. than other S-setae. Setae S2 and S5 of ant. Ill Tergites. Dorsal chaetotaxy very reduced, diffi- subequaltoS8ofant.IV;onant.Ill,S2ismorethan culttoobserveonourmaterial.Onth.IIandth.Ill, 3 times as long as S3. only 2+S dorso-external setae. On abd. IV, a2 ab- Head. 4+4 eyes (2+2 ocular spots well distinct sent and only 1+1 setae in the p-row between S- in alcohol). Seta c3 present; more setae on lateral setae. On abd. V, 1+1 ordinary setae between S- area than in other species. Mouthparts typical of setae. thegenus; distalcombofmandible with 8-9 small Body appendages. Seta M absent on tibiotarsus. teeth. Claw with one obvious inner tooth. Dens with 6 Tergites. On th. II and th. Ill, only 2+S dorso- setae. Mucro half as long or slightly longer than external setae. On abd. IV, a2 present. On abd. V, dens (d/m = 1.8-2). 151 TijdschriftvoorEntomologie,volume 134, 1991 Derivatie nominis. - This species is named in tennalS-setae are relativelypoorlydeveloped. honourofProf. Murphy who noticed in 1965 that Specimens from Indonesia and Philippines have species from Africa should be separated from the been referred to C. asiaticus,but slightdifferences neotropicalgroupofAriesia. inrelativewidthofthebodyandrelativelengthof mucro wereobservedwith theThai material. Discussion. - Three species of Cephalachorutes have 4+4 eyes: C. barthae, C. pestilenMtiae and C. 7. Cephalachorutesnakaoi (Yosii, 1966) murphyi. They are alsodevoidofseta on tibio- comb. n. (fig. 16) tarsus. They can be differentiated after table 2. In addition,C.microphthalmushas3to5eyesoneach Material (type material not examined). - Nepal: 1 side,butthespeciesisdistinguishedeasilyfromthe male, 1 female,6juv.,Marsyandivalley,betweenChame latterby its dens with 3 setae insteadof6. and Tarapani, 2450 m, in litter and humus of Quercus glauca andRhododendron,4.x.77,Deharvengleg.,sam- pleNep77B-118 (leit). 6. Cephalachorutesasiaticussp. n. (figs. 17, 18,21,22) Description Length0.60-0.70mm.Ratiolength/width=2.2. Type material. - Holotype, male, Thailand: Chiang Mai province, Ban On Luoi, 500 m, bamboo litter, Colourblue. 20.vii.1985,Deharvengleg.,sampleCL44(leit).-Para- Antennae. Apicalpapillaofant. IVwith 3 lobes types, Thailand: 2 males, 1 female, 5 juv., same sample more or less distinct, fused to the apex; S4 and (otherspecimensinalcohol) (6inleit,2 inmnhn). particularly S7 thicker than other S-setae, which Other material. - The following material has been are relatively slender. Seta S5 of ant. Ill shorter considered as C. asiaticus: Indonesia: 1 male, Sulawesi than S8 of ant. IV; on ant. Ill, S2 slightly longer S(eclaavet)a,n,20M0armo,sfldiosotdridcetb,riKsa,p1p4a.vnigi.,1G98u6a,SsaalmupklkeainnKdaoll1a4n2g; thanS5 and 3 times as long as S3. 2juv.,SulawesiSelatan,Marosdistrict,Kappang,300m, Head. 5+5 ocelli, sometimes not well distinct. in litter of Lantana bushes, 8.vii.l989, Deharveng and Seta c3 absent. Mouthparts typical of the genus; Bedosleg.,sampleSULS35 (leit).-Philippines:2males, distalcombofmandible with 7-12 small teeth. 3 females,2 juv.,MindoroIsland,PuertoGalera, 150 m, Tergites.Onth.IIandth.Ill,3+Sdorso-external litter in forest, 29.xii.1979, Deharveng leg., sample PHI setae. On abd. IV, a2 present. On abd. V, 2+2 116 (LEIT). ordinary setae betweenS-setae. M Bodyappendages.Seta presentontibiotarsus. Description Claw with one inner tooth, minute or sometimes Length0.55-0.65 mm.Ratiolength/width ^2.3. indistinct.Denswith6setae.Mucrohalfaslongas Colourblue. dens or slightly smaller (d/m = 2-2.2). Antennae. Ant. IV with apical papilla fused to theapex;S7 thickerthanotherS-setae;S2 slightly Discussion. - The original description of the largerthanS3;otherS-setaefairlysmaller.SetaS5 speciesbyYosii (1966) differs in theapicalpapilla ofant. Ill shorterthanS8ofant. IV;onant. Ill,S2 ofant.IVbeingconspicuousanddistinctlytrilobed, subequal toS5 and less than 3 times as long as S3. whereas it is variable but fused to apex in our Head.8+8eyes.Setac3absent.Mouthpartstyp- material. Other characters are concordant, but ical ofthegenus; distalcombofmandible with 9- chaetotaxic information is lacking for the type 10 small teeth. specimens which had lost theS-setaeonbody and Tergites.Onth.IIandth.Ill,3+Sdorso-external antennae, according to the author. C. nakaoi has setae. On abd. IV, a2 present. On abd. V, 2+2 5+5 eyes like the African species (C minimus, C. ordinary setaebetweenS-Msetae. delamareiand C. microphthalmus). Available dif- Bodyappendages.Seta presentontibiotarsus. ferentialcharactersarefew,becausethechaetotaxy Clawwithaminuteinnertooth.Denswith6setae. of these last species is poorly known. The main Mucro half as long as dens (d/m = 2). differences aregiven in the key. Derivatio nominis. - This species is named for Acknowledgements its large repartition through the tropics in South east Asia. We should like to thankJ. M. Thibaud for the loan ofArlesia slides from the Petites Antilles. Discussion. - C. asiaticus is the only species of Cephalachoruteswith8+8eyes.Asotherprimitive character,thisspecieshas,withC.nakaoi,themost complete chaetotaxy of tergites in the genus. An- 152 BedOS&Deharveng: Cephalachorutes References Cassagnau, P., 1974. Chétotaxie et phylogénie chez les Yosii,R., 1966.CollembolaofHimalaya.-Journalofthe CoUemboIesPoduromorphes.-Pedobiologia 14: 300- CollegeofArtsandSciences,ChibaUniversity4 (4): 312. 461-531. Deharveng,L., 1983.MorphologieévolutivedesCoUem- boIes Neanurinae en particulier de la lignée néanu- rienne. - Travaux du Laboratoire d'Ecobiologie des Arthropodes Edaphiques,Toulouse4 (2): 1-63. Massoud, Z., 1967. Monographie des Neanuridae, Col- lembolesPoduromorphesàpiècesbuccalesmodifiées. Received: 22 March 1991 -In:Biologiedel'AmériqueAustrale,CNRS3:7-399. Accepted: 22April 1991 153