Eukiefferiella endobryonia sp. nov., fourth-instar larva and pupa. Larva (A–C): A general appearance of larva B larval antenna, maxilla and mandible, lateral view C mentum. Pupa (D, E): D pupa, ventral aspect E ditto, dorsal aspect. Abbreviations (larva). Abl: accessory blade; Ap: anterior parapods; As: anal seta; Bl: blade; M: mentum; Mx: maxilla; Pc: procercus; Pm: premandible; Pp: posterior parapods; Ro: ring organ; Sa: supraanal seta; Si: seta interna; Ssd: seta subdentalis; Ta: anal tubules. Abbreviations (pupa). Al: anal lobe; Am: anal macroseta; Ho: orally curved hooklets. Scale bars: 0.1 mm (C), 1 mm (A).