male Trichiocercus sparshalli has long fibres like that too. The difference is that Acyphas holds its wings more tightly/tentlike at rest while Trichiocercus holds their wings flatter. Trichiocercus has denser more neater groomed 'hair' with longer 'hair' on their limbs, Acyphas has more unkempt looking 'hair' incl. sticking up along the abdomen/wing edges when at rest. e.g. Acyphas (genus)