On Rugathodes instabilis (O.P. Cambridge), new to Sweden, and R. bellicosus (Simon) (Araneae, Theridiidae)

3 Pages·1993·0.31 MB·

by  Kronestedt, T

On Rugathodes instabilis (O. P.-Cambridge), new to Sweden,
and R. bellicosus (Simon)(Araneae, Theridiidae)
TORBJORN KRONESTEDT
bridge), new to Sweden, and R. bellico-
arna Rugathodes instabilis (O. p._Cam-
Ent. Tidskr. 114 (3): 111-113. Uppsala,
The occurrence of Rugathodes instabilis in Sweden is reported. One female has been found
at an eutrophic pool in Stockholm. The species was hitherto not known from Fennoscandia.
The female copulatory organs of R. instabilis and the related R bellicosus are illustrated.
Information on the occurrence of the latter species in Sweden is given.
T. Kronestedt, Department of Entomology, Swedish Museum of Natural History, Box 50007,
S-104 05 Stockholm, Sweden.
Rugathodes Archer, 1950 was originally erected the flnd locality well accords with the preferred
as a subgenus within the genus Theridion bfi habitat conditions of this species given in Wiehle
placed in synonymy to Theridion by Levi (1957). (1937:"zwischen hohen Kriiutern feuchter Wald-
Rugathodes was recently given full generic rank ungen und sumpflger Gebiete"), Locket & Mil-
by Wunderlich (1987) and this was further sub- lidge (1953: "in marshes...on nettle and other low
stantiated by Wunderlich (1991). Two species of plants") and v. Broen (1985: "stauden an schat-
Rugathodes occur on the European continent. Up tig-feuchtem Standort"). The species has a wide
to now, the occurrence in Sweden of one of them, but scattered distribution in Continental Europe
R. bellicostts (Simon), was known while the other, and on the British Isles. According to Ruzicka
R. instabilis (O. P.-Cambridge), is newly reported (1989, also map), R. instabilis has been found in
from this country. frequency only in Great Britain, Belgium and
Both species are small. Body length (in mm) of France, with sporadic occurrences in Germany,
R. instabilis; males 1.7-2.2, females 2-2.7, and of Poland and Czechia. It was previously not known
R. bellicosus: males 1.6-1.8. females 1.5-2. The from Fennoscandia.
female copulatory organs are shown in Figs.
1
and 2. The egg sac is attached to the spinnerets Rugathodes bellicosus (Simon, 1873)
and dragged by the female in both species. For
useful descriptive details of both species referen- Lule Lappmark: Stora Sj6fallet National Park, Suorva,
ce is given to Wiehle (1937), Locket & Millidge ground with blocks of stone in birch forest, 29.vii.1935:
(1953) and Roberts (1985). 1 female (ZMU). Jiimtland: Are, Mdrvikshummeln.
blocks of stone, 15.vii.1934: 2 females above timber-
Rugathodes instabilis (O. P.-Cambridge, 1871) line, 2 females with egg sacs in alpine zone about 800 m
asl (ZMU). Dalarna: S?irna, Njupeskiir, under stones in
ravine (subalpine), 9.viii.1976: 2 females (NRS). Ore,
(UN pR p Sla).nd: Stockholm, Lappkiirret, 2'7.vii.197 1: 1 female Ntiviisaette, du nfdieerl ds,to n2e0s- 2in3 .hviei.a1p9 7o1f :s to2n esm aalolensg e5d gefe mofa lceusl.-
The specimen was taken by me among lower 1te8r. v1i..179-27 5m: m8 )fle(mNRalSes). Uatter with white egg sacs (diame-
vegetation (Alisma and other plants) at an
eutrophic pool not far from the Swedish Museum This species was first reported from Sweden by
of Natural History. The pool is situated within an Tullgren (1949) who himself collected material in
area of the commune of Stockholm now under northernmost Sweden (TO Kirunavaara,
consideration for nature conservation (the "Eko- 7.viii.1900: 8 females, NRS). Additional finds,
parken WWF" project). The general setting of deposited in the Zoological Museum of Uppsala
111
Torbjdrn Kronestedt Ent. Tidskr. 114 (1993)
it
2
Figs. 1-2. Female copulatory organ of (1) Rugathodes instabilis (UP, Stockholm; posterior rim somewhat damaged),
and (2) R. bellicosus (DR, Ore), ventral view. Cleared preporations (temporarlt microslides) after removal of soft
parts by treatment with trypsin. Scale line: 0.1 mm.
Honligt kopulationsorgan hos klotspindlarna (l) Rugathodes instabilis (UP, Stockholm, bakkanten ndgot skadad)
och (2) R. bellicosus (DR, Ore) sett underifrdn. Tempordra mikropreparar efter trypsinbehandling (fdr avliigsnande
av mjukdelar). Skallinje 0,1 mm.
University (ZM\J: all collected by the late Ake that country (Waaler 1966) to the Lofoten Islands
Holm) and in the Swedish Museum of Natural in the north (Ashmole & Planterose 1979), as
History (NRS: all collected by me), show that this well as from Iceland (Braendegird 1958). One of
species occurs southwards at least to Central the Lofoten and Iceland records respectively
Sweden. were based on specimens collected under stones
R. bellicosus is confined to mountains in Wales. close to the sea. Moreover. R. bellicosus has
N England and Scotland (Locket & Millidge recently been taken in Belgium (Janssen 1988).
1953). In Central Europe, the species is found in
montane areas including subalpine and alpine I thank Dr Lars Wallin for the loan of material housed
conditions (e. g. Thaler 7979:tp to c.2600 m asl) inZMU.
and does also occur at low altitudes (see, e. g..
Ruzicka 1989). Ruzicka (op. cit.) mapped the dis- References
tribution, though not complete. Because of pre- Ashmole. N. P. & Planterose. B. P. 1979. Spiders from
vious possible misidentifications, i. e. confusion arctic Fennoscandia. - Fauna norv. (B) 26:26-30.
with R. instabilis, he only included finds which, BraendegArd. J. 1958. Araneida. - Zoology Iceland 3
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Theridion. and Paidisca in America north of Mexico Wunderlich. J. 19U7. Die Spinnen der Kanarischen
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RoIbreelratsn,d M. .V Jo. l1.9'l8: 5.A Ttyhpeid sapeid-Tehrse roidf ioGsroemata tBidraitae.in Caonld- dveidla Lr aapv pDkjiuirrrgeitr di eSnt oscokmh ofl mn . iiKr aunrrdeetr inugtrdedr ni indge
chester (Harley Books).
Runzoictakbai,l isV, .R 1u9g8a9th. oOdens thbeel lilcitohsoubsi oanntds oLne pRthuygpahthaondteess vEakdo pgaerllkeer nf raWmWtidFa) . nAatrutersnk yidrd stiadtiggiairrdee r in(tper okjieinkdt
instabilis (Araneae: Linyphiidae. Theridiidae). - Acta frAn Skandinavien eller Finland men Ar spridd i
ent. bohemoslov. 86: 432-441. Mellaneuropa och pd Brittiska 6arna. Den ndr-
Thaler, K. 1979. Fragmenta Faunistica Tirolensia. IV. - stiende arten R. bellicosus har tidigare endast
Vertiff. Mus. Ferdinandeum Innsbr. 59: 49-83. rapporterats frin Lappland. Ytterligare fynd
Tullgren, A 1949. Bidrag tilt kzinnedomen om den visar, att den iir riitt spridd i Sverige och fcirekom-
svenska spindelfaunan. III. - Ent. Tidskr. 70: 33-64. mer soderut etminstone till Dalarna. Den dr
Wanaeleare, . PT.h Fe.r i1d9ii6d6a. eT)h enreidwio nto bNelolicrwosauym. -S Nimoorns k(A ernat.- ocksi kiind frAn Norge, Finland och Island och
Tidsskr. l3:183-184. har en vid utbredning i delar av ovriga Europa. R.
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(Kugelspinnen). - Tierwelt Dtl. 33: 1 19-222. stenrosen och liknande.
Handbok om insektfossil i kvartflra avlagringar
Buckland, P.C. & Coope, G.R. 1991. ,4 ligt iimne i ordets riitta bemiirkelse. Forskningen
bibliography and literature review of utnyttjar kunskaper i bide entomologi och
Quaternary entomology. Publisher J.R. geologi, samt i vissa fall iiven Amnesomriden
Collis Publications, Department of som arkeologi. Det ligger sAlunda i dmnets natur
Archaeology & Prehistory, University of att forskningsresultat kan publiceras i geologiska,
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av Entomologisk Tidskrift som handlar om mil- uppmdrksammades redan i slutet av f<irra
jovird och faunahistoria, si kan man liitt ffl den 6rhundradet och svenska forskare var i samman-
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stantiell kunskap om insekter i Sverige fore slutet des den kvartdra paleoentomologiska forsk-
av 1700-talet" (Gdrdenfors & Baranowskt 1992) ningen mycket, frdmst beroende pi att insam-
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