Presence and absence of rayless zone on lateral fins A black arrow shows rayless zone on posterior fin (Zonosagitta nagae) B completely rayed fin (Aidanosagitta crassa).
Part of: Choo S, Jeong M-K, Soh HY (2022) Taxonomic reassessment of chaetognaths (Chaetognatha, Sagittoidea, Aphragmophora) from Korean waters. ZooKeys 1106: 165-211. https://doi.org/10.3897/zookeys.1106.80184