Family SPADELLIDAE Tokioka, 1965
Introduction
Tail segment is relatively large, one or two pairs of lateral fins, corona ciliata is on the neck and is wider than long. Benthic or benthoplanktonic.
Originally, all members were placed under the genus Spadella, however Salvini-Plawen (1986) proposed two new genera (Paraspadella and Bathyspadella) and Casanova (1996) added Hemispadella.
General References
Casanova, J.-P. 1996. A new genus and species of deep-benthic chaetognath from the Atlantic: a probable link between the families Heterokrhniidae and Spadellidae. Journal of Natural History 30: 1239-1245
Salvini-Plawen, L. von 1986. Systematic notes on Spadella and on Chaetognatha in general. Zeitschrift für Zoologische Systematik und Evolutionsforschung 24: 122-128