Hemispadella

Hemispadella is a genus of chaetognaths in the family Spadellidae. It consists of one species, Hemispadella dauvini Casanova, 1996.[1] The species, as the generic name implies, shares numerous, but not all, of the characteristics of Spadellidae; it shares a number of other characteristics with Heterokrohniidae. The ventral ganglion, poorly described in chaetognaths,[2] is of similar size to the Heterokrohniidae, and the larger number of teeth, and the difference in appearance and function between the anterior and posterior teeth, are similarly characteristic. The relative tail size is similar to that of the Spadellidae, although the overall size is unprecedented among the Spadellidae. The more developed nature of transverse musculature and the basis for the lateral fins are as those of Spadellidae, as well.[1]

Hemispadella
Scientific classification
Kingdom:	Animalia
Phylum:	Chaetognatha
Class:	Sagittoidea
Order:	Phragmophora
Family:	Spadellidae
Genus:	Hemispadella Casanova, 1996[1]

References

1. Casanova, J. (1996). A new genus and species of deep benthic chaetognath from the Atlantic: a probable link between the families Heterokrohniidae and Spadellidae. Journal of Natural History, 30, 1239–1245.
2. Bone, Q. & Pulsford, A. (1984). The sense organs and ventral ganglion of Sagitta (Chaetognatha). Acta Zoologica, 65(4), 209–220.