SEM photographs of Promastobranchus variabilis sp. nov., paratype (TIO-BTS-Poly144) A anterior 13 chaetigers B anterior end, ventro-lateral view C transition between thorax and abdomen, lateral view D genital pore on between chaetigers 11/12, lateral view E posterior end showing neuropodia, ventral view F abdominal hooks at chaetiger 16 G ultrastructure of hooks. Abbreviations: cc, capillary chaetae; gp, genital pore; hh, hooded hook; mf, main fang; neu, neuropodia; per, peristomium. Scale bars: 200 μm (A–E); 20 μm (F); 5 μm (G).

 
 
  Part of: Lin J-H, García-Garza ME, Mou J-F, Lin H-S (2023) Description of a new Promastobranchus species (Annelida, Capitellidae) from Chinese coasts, with molecular evidence for intraspecific variation in the number of thoracic chaetigers. ZooKeys 1174: 1-14. https://doi.org/10.3897/zookeys.1174.106624