Oral cone of Darwiniella conjugatum (Darwin, 1854) A Maxilla (CEL-RYU-28-2) B Serrulate setae on apex C Serrulate setae on inferior margin D Maxillule (CEL-RYU-28-2) E Large simple type setae on cutting edge F Maxillule (additional specimen, CEL-RYU-28-1) G Maxillule (additional specimen, CEL-RYU-38-4) H Maxillule (additional specimen, CEL-RYU-66-1). (scale bar: μm)