叶蛛科

The hills near Missoula, Montana, are changing, native grasses and other plants increasingly squeezed out by nonnative plants. Knapweed, cinquefoil, and other weeds aren’t only changing the look of this ecosystem but its very structure. As ecologist Dean Pearson’s research has shown, however, some species are benefitting from the changed habitat in unexpected ways. You just have to look closely to see them. Photo Credit: Dean Pearson read moreDuration: 5:02Published: Wed, 10 Aug 2011 16:30:48 +0000

Allestrupgård Plantage

Asker, Akershus, Norge

Dictyna spider in web on lupine plant with fly prey

Figures 1–5. Habitus of Dictyna palmgreni sp. n. 1–2 from Pallastunturi, Dictyna schmidti 3 from Yakutia and Dictyna major 4–5 from Pyhtaa. 1, 3–4 male; 2, 5 female.

Sødringholm Skov

Asker, Akershus, Norge

Dictyna web on yarrow plant

Figures 6–11.Prosoma and abdomen of Dictyna palmgreni sp. n. 6–9 and Dictyna schmidti 10–11. 6, 10 – male carapace, lateral 7 male abdomen, dorsal 8–9 female abdomen, dorsal 11 prosoma, frontal 6 10–11 from the Upper Kolyma 7 from Krasnoyarsk Province 8–9 from Basegi (Ural).

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Asker, Akershus, Norge

Figures 12–17. Male prosoma of Dictyna palmgreni sp. n. 12–13 from Pallastunturi, Dictyna schmidti 14–15 from Yakutia and Dictyna major 16–17 from Pyhtaa 12, 14, 16 lateral 13, 15, 17 frontal.

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Asker, Akershus, Norge

Figures 18–21. Male palp of Dictyna palmgreni sp. n. 18–19 and Dictyna schmidti 20–21 from the Upper Kolyma 18, 20 ventral 19, 21 retrolateral.

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Figures 22–27. Male palp of Dictyna palmgreni sp. n. 22–23 from Pallastunturi, Dictyna schmidti 24–25 from Yakutia and Dictyna major 26–27 from Pyhtaa 22, 24, 26 ventral 23, 25, 27 retrolateral.

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Figures 28–31. Epigyne of Dictyna palmgreni sp. n. 28–30 from Basegi (Ural) and Dictyna schmidti 31. 28, 31a epigyne, ventral 29, 31b sclerotised part of receptacula 30a,b left receptaculum, different aspects. 31 after Danilov (2000), sub. Dictyna shilenkovi.

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Figures 32–39. Epigyne of Dictyna palmgreni sp. n. 32–33 from Pallastunturi and Dictyna major 34–39 from Pyhtaa 32, 34, 36, 38 macerated epigyne, ventral 33, 35, 39 macerated epigyne, dorsal 37 macerated epigyne showing sac-like structure, frontal. Sac-like structure on Fig. 39 collapsed and sclerotised parts of epigyne became closer.

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Figure 40. Distribution map of Dictyna palmgreni sp. n. (square) and Dictyna schmidti (dot).

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