Dwugrzebka pon\u0119tna (Dictenidia bimaculata) to efektowny gatunek much\u00f3wki z rodziny koziu\u0142kowatych, wyr\u00f3\u017cniaj\u0105cy si\u0119 b\u0142yszcz\u0105cym, czarno-pomara\u0144czowym cia\u0142em, skrzyd\u0142ami z dwiema wyra\u017anymi ciemnymi plamkami oraz \u2013 u samc\u00f3w \u2013 grzebieniastymi czu\u0142kami. Wyst\u0119puje w ca\u0142ej Palearktyce; owady te s\u0105 ca\u0142kowicie niegro\u017ane dla ludzi, a ich bytowanie jest \u015bci\u015ble zwi\u0105zane ze starymi lasami. Samce wykorzystuj\u0105 swoje rozbudowane, przypominaj\u0105ce pi\u00f3ra czu\u0142ki do wychwytywania feromon\u00f3w samic z powietrza. Na ka\u017cdym skrzydle widniej\u0105 dwie ciemnobr\u0105zowe plamy: jedna w okolicach znamionka skrzyd\u0142owego i druga, mniejsza, przy samym wierzcho\u0142ku. Samce maj\u0105 ca\u0142kowicie czarne odw\u0142oki, podczas gdy samice zdobi\u0105 jaskrawo pomara\u0144czowe wzory po bokach, co pozwala im imitowa\u0107 \u017c\u0105dl\u0105ce b\u0142onk\u00f3wki i odstrasza\u0107 drapie\u017cniki. Ich g\u0105sienicowate larwy s\u0105 ksylobiontami \u2013 \u017cyj\u0105 wewn\u0105trz obumieraj\u0105cego drewna, pni i rozk\u0142adaj\u0105cych si\u0119 k\u0142\u00f3d. Poniewa\u017c do pe\u0142nego cyklu rozwojowego potrzebuj\u0105 martwego drewna, ich obecno\u015b\u0107 \u015bwiadczy zazwyczaj o dobrym stanie ekologicznym lasu. Gdy siedzia\u0142em na \u0142\u0105ce w niewielkim laseczku blisko mojego domu w Barkarby w Szwecji, niezdarnie przelecia\u0142a obok mnie \u015bredniej wielko\u015bci samica i usiad\u0142a tu\u017c przede mn\u0105. Zupe\u0142nie si\u0119 nie ba\u0142a, a przez moment przespacerowa\u0142a si\u0119 nawet po mojej d\u0142oni.<\/p>\n","protected":false},"excerpt":{"rendered":"
Dwugrzebka pon\u0119tna (Dictenidia bimaculata) to efektowny gatunek much\u00f3wki z rodziny koziu\u0142kowatych, wyr\u00f3\u017cniaj\u0105cy si\u0119 b\u0142yszcz\u0105cym, czarno-pomara\u0144czowym cia\u0142em, skrzyd\u0142ami z dwiema wyra\u017anymi 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