s , ▁in ▁the ▁sub family ▁Lar enti inae ▁which ▁includes ▁the ▁car pet ▁moth ▁and ▁p ugs . ▁ ▁Like ▁most ▁geom eters ▁the ▁moth ▁rest s ▁with ▁its ▁wings ▁open ▁and ▁this ▁reve als ▁its ▁main ▁distingu ishing ▁feature ▁— ▁a ▁rust y - b rown ▁patch ▁covering ▁the ▁a pe x ▁of ▁the ▁upper ▁surface ▁of ▁the ▁for ew ing , ▁which ▁contrast s ▁with ▁the ▁pale ▁grey ▁colour ▁of ▁the ▁rest ▁of ▁the ▁wings . ▁When ▁seen ▁up ▁close ▁there ▁are ▁faint ▁black ish ▁cross ▁lines ▁too . ▁ ▁The ▁species ▁has ▁a ▁large ▁world ▁range , ▁occurr ing ▁from ▁France , ▁Britain ▁and ▁Sc and in avia ▁through ▁eastern ▁Europe ▁and ▁Russia ▁to ▁China ▁and ▁Japan . ▁ ▁Status ▁in ▁Britain ▁Bl omer ' s ▁riv u let ▁is ▁the ▁only ▁member ▁of ▁its ▁genus ▁found ▁in ▁Britain . ▁ ▁It ▁is ▁regarded ▁by ▁b iod iversity ▁conservation ▁organis ations ▁as ▁important ▁from ▁a ▁conservation ▁perspective , ▁both ▁in ▁its ▁own ▁right ▁due ▁to ▁its ▁nation ally ▁scar ce ▁status ▁but ▁also ▁as ▁a ▁representative ▁of ▁a ▁group ▁of ▁moth s ▁which ▁are ▁special ised ▁feed ers ▁on ▁el m ▁at ▁the ▁lar val ▁stage . ▁ ▁It ▁occurs ▁sp or ad ically ▁throughout ▁Britain , ▁mainly ▁in ▁broad - le aved ▁or ▁mixed ▁wood land ▁habit ats , ▁but ▁also ▁in ▁h ed ger ows . ▁The ▁key ▁habitat ▁requirement ▁is ▁the ▁presence ▁of ▁w ych ▁el m . ▁Other ▁macro - m oth s ▁in ▁the