Records by time
Theridiosomatidae 0-19001901-19501951-20002001-2021
Theridiosoma gemmosum (L. Koch, 1877) Almost threatened 19x 13x 32x

Theridiosoma gemmosum (L. Koch, 1877)

Czech namekřižáček pobřežní
Threat levelAlmost threatened
Records32 nálezů, 22 kvadrátů
First record 1996, M. Holec, Buchar & Růžička 2002
Last record 2021 , Ondřej Machač
Distribution areaEuropean - Me. (Gr.
Phytogeographic areaThermo, Meso
Původnost stanovišťclimax
Humidityvery humid
StratumGround layer
Osvětlení stanovišťsemi-open, partly shaded
Hojnost výskytuscarce probably


 © Oto Zimmermann
The studied locality, i.e. Klánovický les Forest is situated on the edge of Prague, one of the most polluted areas in the Czech Republic. Thanks to large area the forest acts as an isolation from agrochemicals, thus allowing the existence of some habitats sensitive to eutrophisation, in particular peat-bogs, heaths, bare sandy soils, and Molinia meadows. The habitats harbour unusually high species diversity of spiders and
harvestmen: the author recorded 286 spider and 11 harvestman species there, which is approximately one third of the Czech fauna. Sixty one of them are red-listed in the Czech Republic. Peat-bog linyphiid Saaristoa abnormis, and steppe lycosid Alopecosa schmidti and linyphiid Panamomops inconspicuus are listed as endangered. Local small peat-bogs offer suitable conditions for disappearing lycosids Hygrolycosa
rubrofasciata, Pirata piscatorius and Piratula uliginosa, while heaths harbour the disappearing Oxyopes ramosus. Water spider Argyroneta aquatica has recently been found in small pools in ditches along the railway. Littoral vegetation is inhabited by Theridiosoma gemmosum and the jumping spider Calositticus floricola. Disturbed soil surface of wet meadows harbours the wolf spider Arctosa leopardus. Some species have recently appeared at the site, for example Dysdera hungarica, the harvestman Nemastoma bidentatum sparsum or the crab spider Synema globosum. The first two were probably introduced there by man, the latter probably expands due to climate change. The author suggests to keep these habitats without woody vegetation to protect local high species diversity there.

 © Oto Zimmermann

V roce 2012–2013 byl proveden první inventarizační průzkum pavouků v NPR Zástudánčí. Na území rezervace bylo zjištěno 117 druhů pavouků z 21 čeledí. Druhy Arctosa cinerea, Caviphantes saxetorum, Clubiona germanica a Sitticus dzieduszyckii jsou zařazeny v červeném seznamu pavouků ČR a jsou zároveň nejvýznamnějšími nálezy. Pavučenka Caviphantes saxetorum je novým druhem pro Českou republiku. Nejzajímavější společenstvo pavouků bylo zjištěno na štěrkových náplavech v meandru řeky Moravy.



By month

By altitude

By collecting method (32 used records)
Theridiosoma gemmosum (L. Koch, 1877) LCMalesFemalesJuvenilesRecords
Individuální sběr416619
Zemní past6332

By biotope (32 used records)
Theridiosoma gemmosum (L. Koch, 1877) LCMalesFemalesJuvenilesRecords
Lužní lesy nížin2102
Ostřicové porosty stojatých vod0537
Rákosiny a orobincové porosty stojatých vod1427
Vlhké doubravy0101
Bylinné porosty břehů6533