What is "ptiloprora"

Ptiloprora is a genus of bird in the Meliphagidae family. It contains the following species:

• Rufous-sided honeyeater (Ptiloprora erythropleura)
• Rufous-backed honeyeater (Ptiloprora guisei)
• Mayr's honeyeater (Ptiloprora mayri)
• Yellowish-streaked honeyeater (Ptiloprora meekiana)
• Grey-streaked honeyeater (Ptiloprora perstriata)
• Leaden honeyeater (Ptiloprora plumbea)