Guītú 龜圖 (fl. late ninth century), styled Dēngshì láng and former Cānjūn, the otherwise unidentified annotator of the Běihù lù 北戶錄 (KR2k0106) by 段公路. The Sìkù tíyào suggests he was probably a kinsman of Duàn Gōnglù — though the Tángshū chéngxiàng shìxì biǎo does not record his name; surname unknown. His annotations form a substantial parallel layer to Duàn’s main text and are a major secondary witness to the lost late-Táng fēngtǔ literature of Lǐngnán.