Sylphella puccoon gen. n., sp. n. A Anterior part of the worm, showing prostomium B clitellar epidermis C chaeta in XII D egg sac containing oocytes and some blood vessels E dorsal vessel showing the cardiac cells and supra-intestinal vessel, dorsal to the intestine in segment XVII F reproductive segments, showing two atria, with their respective sperm funnels, and spermathecae of an unmated specimen G sperm funnel on the septum behind the atrium H atrial ampulla with sperm in the lumen, showing the several layers of musculature I prostatic cells forming small clusters over the atrial ampulla J cross-hatched muscular fibers shown at the surface of the atrial ampulla K Spermathecal ampulla with loose sperm in the lumen L spermathecal duct M penis within the penial sac, with conical penial sheath. For comparison N penis with tubular cuticular sheath in Styloscolex japonicus, and O penis with a soft cuticular layer in Lumbriculus japonicus. D, E, G–O histological sections of reproductive organs, other photographs from stained whole mounts or dissected specimens.