Cephalachorutes gen. n., a new genus of tropical Neanuridae (Collembola)

9 Pages·1991·4.4 MB·English

by  A Bedos

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