Agroeca dentigera and Entelecara omissa (Araneae: Liocranidae, Linyphiidae) found in Sweden

2005·3.1 MB·English

by  Lars J Jonsson

Arachnol.Mitt. 29:49-52 Nürnberg,Juni 2005
Agroecadentigeraand Entelecaraomissa(Araneae: Liocranidae, Linyphiidae),
found in Sweden
LarsJ.Jonsson
Abstract:TherarespiderspeciesAgroecadentigeraKu\czyr\sk\,1913(Liocranidae)andEntelecaraomissaO.P.-Cam-
bridge, 1902 (Linyphiidae), have been found in a small coastal freshwater fen in Lomma (55°42'N 13°4'E),
northofMalmöinScania insouthernmostSweden.A.dentigerawasalsofoundonasaltwatermeadowsouth
ofMalmö.BothspecieshavebeenfoundonlyinafewwetlocalitiesinEurope.EntelecaradepilataJuWgren,1955,
isajuniorsynonymofEntelecaraomissaO.P.-Cambridge,1902,newsynonymy.
keywords:Entelecaradepilata,faunisitcs,fen,newrecord,newsynonymy
Inastudyofthespiderfauna,1990-1992,ofasmall RELYS et al. 2002), Belarus (MIKHAILOV pers.
open freshwater fen on the coast in Habo, Lom- comm.),Ukraine (MIKHAILOV1997) andin Rus-
ma,Scania,southernmostSweden,55°42'N 13°4'E, sia (KULCZYNSKI 1913), eastwards to the Urals
&
therarespiderspeciesAgroecadentigeraKulczynski, (Esyunin Efimik 1996).
1913 andEntelecaraomissaO.P.-Cambridge,1902 ThefemaleoriginallydescribedbyKULCZYNSKI,
were found. 1913, has later been figured by several arachnolo-
gists(Braun 1967,OLTEAN 1973,JOCQUE 1977,
Agroecadentigera(Liocranidae) Sterghiu 1985, Roberts 1998 and Felton et
A. dentigeraKulczynski, 1913 was found on andin al.2004).Thedrawingoftheheart-shapedepigyne
tussocks ofCarexelatainasmallsemi-openmeso-
trophic coastal marsh surrounded by alder trees.
In pitfall traps one female and one juvenile were
trapped (26 March - 5 Apr. 1991), one juvenile
(14 May - 3 June 1991), one male (7 - 30 Nov.
1991) the top oftussocks.Two males were found
in the middle of a tussock that was cut in small
pieces (27 Oct. 1991). Agroeca dentigera has also
been found previously at another locality on the
coast of Scania. S. Almquist (pers. com.) found
one female in a drift ofPhragmites australis on a
coastalpastureusedbyhorses southofKlagshamn
(55°30'N 12°55'E), 3 Sept. 1976.The female was
foundinthe areabetweenthepastureandabeltof
Phragmitesin seawater.
Agroecadentigerahas been reported from a few
places in Germany (BRAUN 1967,WUNDERLICH
1975, PLATEN et al. 1999), Belgium (JOCQUE
1977,JANSSEN 1991), Romania (OLTEAN 1973,
STERGHIU 1985), Poland (KUPRYJANOWICZ
1997), the Netherlands (v. HELSDINGEN 1999),
Wales (FELTON et al. 2004), Finland, Lithuania
&
(KOPONEN et al. 2000, RELYS DAPKUS 2002,
Fig.1-2:AgroecadentigeraKulczynski,leftmalepedipalp:
LarsJ.JONSSON,MNA,KristianstadUniversity,SE-291 88 1-ventralview,2-retrolateralview.DrawingsbySven
Almquist.
Kristianstad,Sweden.E-Mail:[email protected]
50 LJ.Jonsson
atleastsomeofthetime,onthesurface
during the night.The species is active
in autumn andspring,butcan also fall
into pitfall traps during the winter. It
is red-listed as vulnerable in Sweden
(GÄRDENFORS 2005).
Entelecaraomissa(Linyphiidae)
Entelecara omissa was described by
PlCKARD-CAMBRIDGE (1902), but
was named without any detailed
description as a nomen nudum two
years earlier (PlCKARD-CAMBRIDGE
1900).The first drawings ofthe male
palp were published later (PlCKARD-
CAMBRIDGE 1903), although the
drawing of the female's epigyne was
ofEntelecaraerrata(O. P.-Cambridge,
1913) (see PlCKARD-CAMBRIDGE
Fig.3-6:AgroecadentigeraKulczyriski,femaleepigyne:3-dorsalview,newly 1913). O. P.-Cambridge never made
moultedfemale,4-ventralview,newlymoultedfemale,5-dorsalview,
any drawings of the female of E.
oldfemale,6-ventralview,oldfemale.DrawingsbySvenAlmquist.
omissa. It has been reported from
mesotrophic fens in England and
by GRIMM (1986) and the copy in HEIMER 8c from Ireland (RUSSEL-SMITH 2002), from a fen
NENTWIG (1991) is somewhat atypical.The male area in Belgium (DECLEER 1992), from fens in
hasbeenfiguredbyWUNDERLICH(1975)JOCQUE Poland(KUPRYJANOWICZ1997),fromUkraine(K.
(1977),Roberts(1998)andFeltonetal.(2004). Mikhailov pers. com.), from a reed swamp in the
Figs. 1-2 showthepedipalp ofamale andfigs. 3-6 CzechRepublic (BUCHAR8cRÜZICKA2002),the
the epigyne offemales from Sweden. Netherlands (van HELSDINGEN 1999) and from
WUNDERLICH (1975) found A. dentigera in an ombrotrophic mire in Germany (SCHIKORA
a marsh with Carex laslocarpa surrounded by an 1994) and also from two other localities in Ger-
alderfen.JOCQUE (1977) founditamongheather, many (STAUDT 2004). The latter two records in
Calluna vulgaris on dry ground near water and STAUDT(2004)areprobablymisidentificationsand
,
among the grass Mollnia caerulea on wet ground. need confirmation (Blick, pers. com.). In England
According to himA. dentigera needs ’’the vicinity the species is found among tussocks and litter, cut
ofwet acid soils”. It has also been reported from sedge,reed-bedsandsimilarhabitatsatgroundlevel
mosses of Sphagnum (BRAUN 1967, STERGHIU in fens (RUSSEL-SMITH 2002).
1985, JANSSEN 1991). In Romania it has been InthesamefeninLommaasAgroecadentigeraa
foundinafloatingbeltofPhragmitesintheDanube femaleofEntelecaraomissawasfound(7Nov. 1990).
delta and in associationwith Sphagnum (OLTEAN E. omissahasalsobeenfoundatthreedifferentlakes
1973,STERGHIU1985).TherecordsinFinlandand nearStockholmasreportedbyTULLGREN(1955)as
Lithuania are from peatbogs, both open and with anewspecies:Entelecaradepllata.Bycomparingthe
pines (KOPONEN et al. 2001, RELYS et al. 2002). drawingsanddescriptionbyTLJLLGREN(1955)and
NRM
ThereportfromWalesisfromasomewhatdifferent by checking the types in the in Stockholm
environment, from a hollow in a fixed sand dune withthedrawingsmadebyLOCKET8cMlLLIDGE
withAmmophllaarenarladominant(FELTONetal. (1953), Roberts (1987) andTAZOE (1993), it is
2004). It seems thatA. dentigera needs wet, thick obviousthatEntelecaradepllataTullgrenisajunior
heaps ofvegetation, e.g. tussocks or mosses. It is synonymofEntelecaraomissaO.P.-Cambridge,new
obviouslyhygrophilous.Probablyitspendstheday synonym.In Swedentwofemales ofEntelecarade-
intussocks,mossesorotherwetheapsandwanders, pllatahave also been reported from the open mire
AgroecadentigeraandEntelecaraomissainSweden 51
Theridiosomagemmosum,Aphiletamiseraand Tapi-
nocybabiscissa.
Coastal fresh water mires are threatened by
drainage,andbyscrubandtreevegetationinvading
into the open fens.The latter is happening in this
smallfenandthisisthreateningthisunusualspider
assemblage. In 2002, despite searching, no speci-
men ofAgroeca dentigeraorEntelecara omissawere
found. Probablythe species can stillbe found,but
in small numbers.The fen is subject to a drainage
Fig.7-8:EntelecaraomissaO.P.-Cambridge,femaleepigynes:
7-fromTullgren(1955:Taf.IV,Fig.8a,subE.depilata),8- proposal.
from Roberts(1987:p.41,fig.11f).
Acknowledgements
Thanks to Sven Almquist for information and loan
Knisamyr(ALMQUIST 1984).Thosefemales have ofspecimen and for allowing to use his drawings on
been checked and areE. omissa.Entelecaradepilata A. dentigera, to MichaelJ. Roberts for allowing to use
has also been reported from Estonia (VlLBASTE hisdrawingsonE. omissa toTheoBlick,JasonDunlop,
,
1987) and is probablyalso E. omissa. Oliver-D.FinchandKirillMikhailovforvaluableinfor-
The syntypes ofE. depilata in the NRM are mationandsuggestions,andtoTorbjörn Kronestedtfor
small, total length approx. 1,5 mm, cephalothorax loanofspecimenfromNRM.
approx. 0,65 mm.They are rather dark, with yel-
lowish legs bearing dark annulation on the coxae. References
They have trichobothria on metatarsus I-III, but ALMQUISTS. (1984): Samhällenavspindlarochlocke-
notrichobothriumonlegIV.Anteriormedianeyes spindlarpäKnisamyr.-Ent.Tidskr. 105: 143-150
slightlylarger than anterior lateral eyes (Tullgren, BRAUN R. (1967): Agroeca dentigera Kulczynski 1913
1955; pers. obs.). Trichobothria on metatarsus einefurDeutschlandneueClubionidae.-Senckenb.
I approx. 0,45. This is in accordance with the biol.48: 179-181
& &
descriptions ofEntelecara omissa by LOCKET BUCHARJ. V.RÜZICKA(2002):CatalogueofSpiders
MlLLIDGE (1953) and ROBERTS (1987). Fig. 7 ofthe CzechRepublic.PeresPubl.,Praha.351 pp.
shows the drawing of the epigyne ofE. depilata DECLEERK.(1992):FirstrecordoftheLinyphiidspider
made byTULLGREN (1955) and fig. 8 shows the Entelecaraomissa(O.P.Cambridge)ontheEuropean
epigynes byROBERTS (1987). Mainland.-Newsl.Br. archnol. Soc. 64: 6.
&
ESYUNIN S.L. V.E.EFIMIK(1996): Catalogueofthe
KMK
Thefenandits spiders spidersoftheUrals. ScientificPress,Moscow.
Iconltlhecetfeed.nT83hespmecoisetswceormemfoounnsdpaindedr1s0p2e5cisespeocnimtehne FEL2T29ONpp.C., S.Judd & P. MERRETT (2004):Agroeca
tussocks of Carex elata in Lomma were: Pardosa dBernittiagienra(AKrualncezayen,skLii,oc1r9a1n3i,daae)l.io-crBaunlild.sBpri.dearrancehnwolt.o
amentata, Pardosaprativaga, Piratapiraticus, Tro- Soc. 13: 90-92
chosaspinipalpis,Pachygnathaclercki, Gongylidiellum GÄRDENFORSU.(ed.)(2005):RödlistadearteriSverige
murcidum,Erigonellaignobilis, Walckenaeriaunicor- 2005 - The 2005 Red List of Swedish Species.
nisand Zoraspinimana. Rare species found in the Artdatabanken, SLU,Uppsala.
fenincludeHypommafulvum,Eophommapunctatum
,
52 LJ.Jonsson
GRIMM U. (1986): Die Clubionidae Mitteleuropas. Platen R., B. von Broen, A. Herrmann, U.M.
Corinninae und Liocraninae (Arachnida: Araneae). RATSCHKER&PSacher.(1999):Gesamtartenliste
-Abh.Naturw.Ver. Hamburg(N.F.)27: 1-91 und Rote Liste derWebspinnen,Weberknechteund
HEIMERS.&W.NENTWIG(1991):SpinnenMitteleu- Pseudoskorpione des Landes Brandenburg (Arach-
ropas. Parey.Berlinu.Hamburg.542pp. nida: Araneae, Opiliones, Pseudoscorpiones) mit
HELSDINGEN P.J.van(1999): Catalogusvan deNeder- Angaben zur Häufigkeit und Ökologie.-Natursch.
landseSpinnen(Araneae).-Nederl.Faun.Mededel. Landschaftspfl.Brandenburg8 (2),Beilage: 1-69
10: 1-191 RELYSV.&D.DAPKUS(2002):Commentstothecheck-
JANSSEN M. (1991): Spinnen van de Mechelse Heide. listofGnaphosidaeandLiocranidae(Arachnida,Ara-
-Natuurhist.Maandbl. 80: 12-16 neae)oftheBalticStates,withremarksonspeciesnew
JOCQUER.(1977):OntheoccurenceofAgroecadentigera toLithuania.-EuropeanArachnology2000,Proc.19
thEurop. Coll.Arachnol:273-278;Arhus.
KulczynskiinBelgium(Araneae,Clubionidae).-Bull. &
Br. arachnol. Soc.4: 80-82 RELYS V., S. KOPONEN D. DAPKUS (2002):Annual
KOPONENS.,V.RELYS&D.DAPKUS(2001):Changes dciofmfmeurneincteisesa.n-d spAercaiceshntoulr.no3v0:er41in6-p4e2a4t bog spider
in structure ofground-living spider (Araneae) com- J.
munitiesonpeatbogsalongatransectfromLithuania ROBERTSM.J.(1987):TheSpidersofGreatBritainand
to Lapland.-Norw.J. Entomol.48: 167-174 Ireland.Vol.2. Harley,Colchester.204pp.
KulczynskiV.(1913):Arachnoidea.In:Velitschovs- ROBERTS M.J. (1998): Spinnen Gids. Tirion, Baarn.
KY V. (ed.): Faune du district de Walouyki du gou- 395 pp.
vernement de Woronege (Russie). Vol. 10: 1-30; RUSSEL-SMITH A. (2002): Entelecara omissa. p. 83. In:
Krakau. HarveyP.R.,D. Nellist&M.G.Telfer(eds.):
KUPRYJANOWICZ (1997): Spidersofthe BiebrzaNa- Provisional Atlas of British Spiders (Arachnida,
J.
tionalPark-species newandrare toPoland.-Proc. Araneae), Vol. 1: 1-214. Biological Records Centre,
Huntingdon.
16th Europ. Coll.Arachnol.: 183-194; Siedlce.
Locket G.H. &A.F. Millidge (1953): British Spi- SCHIKORA H.B. (1994): Entelecara omissa neu für
ders,vol. II. RaySociety,London.449 pp. Deutschland (Araneae: Linyphiidae). - Arachnol.
MIKHAILOV K.G. (1997): Catalogue ofspiders ofthe Mitt. 8: 63-64
territories ofthe former Soviet Union (Arachnida, STAUDT A. (2004): Nachweiskarten der Spinnen-
Aranei). KMKScientificPress,Moscow.416pp. ltiieorneesD,euPtssecuhdloasncdosrpi(Aornaecsh)n.id-a:IAntrearnneeate:, hOtptip-:
OLTEAN C. (1973):Agroecadentigera Kulczynski 1913
(Aran., Clubionidae), eine seltene Art, neu fur Ru- //www.spiderling.de.vu/
2m5ä:ni1e0n5s-1F1a0una. - Stud . Cercetari Biol., Ser. Zool. STE-RFGaHuInUa RCe.p.(1S9o8c5.):RoFmaarnn.iaCl5u:b1i-o1n6i8dae. Arachnida.
PlCKARD-CAMBRIDGEO.(1900):ListofBritish&Irish TAZOES.(1993):AnewspeciesofthegenusEntelecara
PlCspKiAdeRrDs.-SCiAmMeB&RICDoG,EDoOr.ch(e1s9t0e2r).:86Onpp.new and rare (SAoruatnhewaees:tLJianpyapnh.i-idAacet)afArroamchInroilo.m4o2t:ej6i9a-m7a2Island,
British Arachnida. - Proc. Dorset Nat. Hist. Field TULLGRENA. (1955): ZurKenntnis schwedischerEri-
Club 23: 16-40 goniden.-Ark. Zool. (2) 7:295-389
PlCKARD-CAMBRIDGE O. (1903): On new and rare VlLBASTE A. (1987): Eesti Amblikud (Aranei).
2B4r:it1is4h9-s1pi7d1ers.-Proc.DorsetNat. Hist.FieldClub AAnnnotaenenroittautdednicmheesctkilki.st[.E]s.toEneisatnisNpiSdeVrsT(eAardanuesit)e.
PlCKARD-CAMBRIDGE O. (1913): On new and rare Akadeemia,Tallin. 178pp.
British Arachnida. - Proc. Dorset Nat. Hist. Field WUNDERLICHJ. (1975): Dritter Beitrag zur Spinnen-
Club 34: 107-136 faunaBerlins(Arachnida:Araneae).-Sb.Ges.naturf.
Fr.BerlinN.F. 15: 39-57