A new species of Uusitaloia Marusik, Koponen & Danilov (Araneae: Linyphiidae: Erigoninae), a genus thought to be monotypic, from the Wrangel Island, NE Russia

2009·0.65 MB·

by  Yuri Marusik

©EntomologicaFennica.30March2009
Anew species of Uusitaloia Marusik, Koponen & Danilov
(Araneae: Linyphiidae: Erigoninae), a genus thought
to be monotypic, from the Wrangel Island, NE Russia
YuriM.Marusik&SeppoKoponen
Marusik,Yu.M.&Koponen,S.2009:AnewspeciesofUusitaloiaMarusik,Ko-
ponen & Danilov (Araneae: Linyphiidae: Erigoninae), a genus thought to be
monotypic,fromtheWrangelIsland,NERussia.—Entomol.Fennica20:18–
21.
Anewspecies,Uusitaloiawrangelianasp.n.isdescribedonthebasisoftwo
malesfromthearcticWrangelIsland,NERussia.Thetypespeciesofthegenus,
whichhasbeenthoughttobemonotypic,U.transbaicalicaMarusik,Koponen&
Danilov,2001isredescribed.Thepositionofthegenuswithinitssubfamilyis
alsobrieflydiscussed.
Yu. M. Marusik, Institute for Biological Problems of the North, IBPN, RAS,
PortovayaStr.18,Magadan685000Russia;E-mail:[email protected]
S.Koponen,ZoologicalMuseum,UniversityofTurku,FI-20014Turku,Finland;
E-mail:[email protected]
Received10October2007,accepted5December2007
1.Introduction specieswascollected,lies3600kmnortheastof
theBarguzinrange.Inthispaperwedescribethe
Spiders of the Arctic islands are rather well newspeciesandredescribethetypespeciesofthe
knownduetonumeroustaxonomicandfaunistic genus,U.transbaicalica.
publications.WrangelIslandisthesecondinspe- Thetypematerialofthenewspeciesisdepos-
ciesrichnessamongarcticislands,withabout45 itedintheZoologicalMuseum,MoscowLomo-
reportedspecies(Marusik&Koponen2006).Its nosov State University (ZMMU) and the holo-
spiderfaunahasbeensurveyedinseveralworks typeofU.transbaicalicaintheZoologicalMu-
(Khrulyova 1987, Marusik et al. 1992, Stishov seum,UniversityofTurku(ZMUT).
2004).Nevertheless,materialcollectedonthisis-
landin2006revealedseveraladditionalspecies
including an undescribed one, belonging to the 2.SpeciesofUusitaloia
erigoninegenusUusitaloiaMarusik,Koponen&
Danilov, 2001. This genus was thought to be 2.1.Uusitaloiawrangelianasp.n.
monotypic(seePlatnick2007).Thetypespecies, (Figs.1a–b,2d–e)
U.transbaicalicaMarusik,Koponen&Danilov,
2001,wasdescribedfromtheBarguzinmountain Typematerial.HolotypemaleinZMMUwithla-
range, northeastern Buryatia, Transbaikalia. A bel “NE Russia, Wrangel Isl., upper flow of
single male (the holotype) was collected from Neizvestnaya River, 71º 12.933’N, 179º
mountaintundra.WrangelIsland,wherethenew 19,353’W,128m,steppe-likemound#2,July6–
ENTOMOL.FENNICAVol.20 (cid:127) AnewspeciesofUusitaloia 19
Fig.1.Uusitaloia
wrangelianasp.n.,
holotype(a–b)andU.
transbaicalica,holotype
(c–e).–a,c.Leftmale
palp,retrolateralview.
–b,e.Tibia,dorsal
view.–d.Terminalpart
ofbulb,retrolateral
view.Scale=0.1mm.
Abbreviations:Ea:em-
bolicapophysis,Em:
embolus,Ma:median
suprategularapo-
physis,Me:embolic
membrane,Sa:supra-
tegularapophysis.
August3,2006(O.A.Khrulyova)”andmalepa- trichobothrium,tibiaIVwith2trichobothria(Fig.
ratypewithsamegeographicallabel,steppe-like 2e).Spination2-2-2-1,spinesonlegIverysmall
mound#3,3.VII.–3.VIII.2006. andbarelydistinguishable,about1/3oftibiadi-
Description. Male. Total length: 1.79 (All ameter,spinesonlegsII–IVarestouter.Palpasin
measurementsaregiveninmm).Carapaceelon- Figs.1a–b,2d–e,tibiawithonedorsalapophysis,
gate(Fig.2e):0.71long,0.52wide,length/width it is rounded on the tip, paracymbium three-di-
ratio=1.37. Body brownish, legslighter. Cara- mensional,withtriangleoutgrowthbelowhook-
pacewithpattern(Fig.2e):darkspotincenterand liketip,baseofparacymbiumwith4finesetae,
radialstripes.Chelicerawithdistinctstridulatory protegulum undeveloped. Suprategulum with
fieldcoveringabout2/3oflateralsurface,5large subconical mesal apophysis (Ma) suprategular
promarginal teeth and 3–4 fine retromarginal apophysis (Sa) very long, with its apical half
teeth.Themeasurementsoflegsandlegjointsare making about a 100º turn. Embolic division S-
in Table 1. TmI = 0.64. Tibia I–III with one shaped,embolicpart(Em)withsharplypointed
Table1.ThelengthoflegsandlegjointsofUusitaloiawrangelianasp.n.,holotype(inmm).
Leg\joint Femur Patella Tibia Metatarsus Tarsus Total
I 0.53 0.17 0.51 0.33 0.29 1.83
II 0.50 0.16 0.44 0.36 0.30 1.76
III 0.46 0.16 0.36 0.34 0.30 1.62
IV 0.59 0.16 0.53 0.47 0.33 2.08
20 Marusik&Koponen (cid:127) ENTOMOL.FENNICAVol.20
Fig.2.Uusitaloia
transbaicalica,holotype
(a–c)andU.wrange-
lianasp.n.,holotype(d–
e).–a–d.Terminalpart
ofthebulb,viewfrom
above,differentturns.–
e.HabitusofU.
wrangelianasp.n.,all
trichobothriaonleftlegs
pointed.Scale=0.1
mm.Abbreviations:Ea:
embolicapophysis,Em:
embolus,Ma:median
suprategularapo-
physis,Me:embolic
membrane,Sa:supra-
tegularapophysis.
outgrowth(Ea).Embolicmembranewide,poorly
visibleduetohardsclerotisationoftheembolic
divisionandsuprategularapophysis.
Femaleunknown.
Diagnosis. The new species in general ap-
pearance resembles very much the type species
U. transbaicalica and has carapace and palp of
thesamesize.Thetwospeciescanbeseparated
by the presence of modified hairs on the ocular
areainU.transbaicalicawhichareabsentinthe
newspecies.Thenewspeciescanalsobedistin-
guished by the rounded tip of the tegular apo-
physis(Fig.1b)(rectangularinU.transbaicalica,
Fig. 1e), and the presence of a spine-like out-
growthofembolus(Figs.1a,2d)(nooutgrowth Fig.3.TypelocalitiesofUusitaloiatransbaicalicaand
U.wrangelianasp.n.
inU.transbaicalica,Figs.2a–c).Thetwospecies
alsoslightlydifferintheshapeofparacymbium.
Biology. The specimens were collected on
steppe-likemound. Etymology.Thespeciesnameisderivedfrom
Distribution.Typelocalityonly(Fig.3). thetypelocality.
ENTOMOL.FENNICAVol.20 (cid:127) AnewspeciesofUusitaloia 21
2.2.UusitaloiatransbaicalicaMarusik, Although females in this genus are still un-
Koponen&Danilov,2001(Figs.1c–e,2a–c) known, it is possible to expect that the ventral
epigynalplateissubdividedintwopartslikein
U.t.Marusiketal.,2001:90,f.39–48(D#). others of the Savignia group (Savignia, Arae-
Materialexamined.HolotypemaleinZMUT oncus,Diplocephalus,Dicymbium,etc.).
withlabel“RUSSIA:Buryatia,Barguzinrange, Judgingfromthesizeofdisjunctionbetween
OlsoRiver,54º52’N,110º55’E,1650m,4July thetwo Uusitaloia species (Fig. 3), which indi-
1996(M.Uusitalo)”. cateslargerearlierrangeofthegenus,itiseasyto
Description. Total length 1.53. Carapace expectthatadditionalspeciesofthisgenuscanbe
length 0.71, width 0.53, unmodified, with head foundinmountainsofSouthandNortheasternSi-
slightly elevated above thorax, greyish-brown beria. Most of these mountain areas are poorly
withdarkermargins,radialstripesandrhomboid studied.
spot in posterior part of cephalic area. Clypeus
and eye area covered with short, sparse hairs. Acknowledgements.WewishtoexpressourthankstoDr.
Sternum dirty brownish. Abdomen dark grey. OlgaA.Khrulyova(Moscow)whocollectedthenewspe-
cies,andtoDr.OlgaL.Makarova(Moscow),whopassed
Legs yellow. Spination 2-2-2-1, leg I segments:
unsorted material to us. This study was supported by
0.54+0.64+0.37+0.31.TmI0.65.TmIVabsent.
INTASgrantNr05-1000008-8224.
PalpasinFigs.1c–e,2a–c.
Diagnosis.SeeunderU.wrangelianasp.n.
Distribution.Typelocalityonly(Fig.3).
References
3.Discussion
Khrulyova, O. A. 1987: Invertebrates. Fauna of the
WrangelIslandReserve.—In:Mikhailov,K.G.(ed.),
Indescribingthenewgenus,we(Marusiketal. Operative-informative materials: 6–36. Institute of
2001) overlooked some fine spines on the legs Ecology and Morphology of Animals, Moscow. [In
Russian]
andthusgavethewrongspine-formula0-1-1-1.
Marusik,Yu.M.&Koponen,S.2006:Diversityofspiders
Thecorrectformulais2-2-2-1.Discoveryofthe
(Araneae)onArcticIslands.—Abstracts,23rdEuro-
newspeciesdidnotleadtoanysignificantchange
peanColloquiumofArachnology.Sitges,Barcelona
of the diagnosis. Clypeus and eye field may or 2006:69.
may not be covered by hairs, and the embolus Marusik,Yu.M.,Eskov,K.Yu.&Kim,J.P.1992:Acheck-
mayhaveanoutgrowth.Judgingfromtheconfor- listofspiders(Aranei)ofNorthEastAsia.—Korean
Arachnology8(1/2):129–158.
mationofthemalepalp,thisgenusbelongstothe
Marusik,Yu.M.,Koponen,S.&Danilov,S.N.2001:Tax-
SavigniagroupsensuMillidge(1977)duetothe
onomicandfaunisticnotesonlinyphiidsofTransbai-
elongatedsuprategularapophysisturnedaround kalia and south Siberia. — Bulletin of the British
thetipofembolus(embolicdivision). ArachnologicalSociety12(2):83–92.
From all members of this group Uusitaloia Millidge,A.F.1977:Theconformationofthemalepalpal
differs by the position of a trichobothrium on organsoflinyphiidspiders,anditsapplicationtothe
taxonomic and phylogenetic analysis of the family
metatarsusI(0.64–0.65)andthespination(2-2-2-
(Araneae: Linyphiidae). — Bulletin of the British
1).Allothergenerahaveatrichobothriumatthe
ArachnologicalSociety4:1–60.
positionbetween0.35and0.55andthespination Platnick,N.I.2007:Theworldspidercatalog,version8.0.
2-2-1-1. Like Dicymbium, and unlike in other —AmericanMuseumofNaturalHistory.[wwwdo-
generaoftheSavigniagroup,Uusitaloialacksa cument]. URL http://research.amnh.org/entomolo-
gy/spiders/catalog/index.html (accessed September
trichobothriumonlegIV.Anotheruniqueaffinity
2007).
ofthisgenusistheextremely longsuprategular
Stishov,M.S.2004:(WrangelIsland–modelofnatureand
apophysis,whichislongerthantheembolicdivi-
naturalanomaly).—MariPublishingHouse,Yosh-
sion. kar-Ola.596pp.[InRussian]