Bathyspadella

Bathyspadella is a genus of chaetognaths in the family Spadellidae. The genus shares morphological similarities to Eukrohniidae and Spadellidae, although it is molecularly similar to Heterokrohniidae.[2] The unusual position of Bathyspadella would indicate a need to revise the existing order of Phragmophora; however, that would be very difficult, as a number of genera and species exist only in small or difficult to access populations, by which it would be difficult to fully examine all related species. A review of the Chaetognatha, published after the discovery of B. oxydentata, found that the standard division of Phragmophora and Aphragmophora to be improper molecularly, noting the close morphological convergence of the Krohnittidae (Aphragmophora) and Xenokrohnia (Phragmophora: Heterokrohniidae).[3]

Bathyspadella
Scientific classification
Kingdom:
Animalia
Phylum:
Chaetognatha
Class:
Sagittoidea
Order:
Phragmophora
Family:
Spadellidae
Genus:
Bathyspadella

Tokioka, 1939[1]

Species
  • Bathyspadella edentata Tokioka, 1939[1]
  • Bathyspadella oxydentata Miyamoto & Nishida, 2011[2]

References
  1. Tokioka, T. (1939). Three new chaetognaths from Japanese waters. Memoirs of the Imperial Marine Observatory, 7, 129–139.
  2. Miyamoto, H. & Nishida, S. (2011). A new deep-sea benthopelagic chaetognath of the genus Bathyspadella (Chaetognatha) with ecological and molecular phylogenetic remarks. Journal of Natural History, 45(45), 2785–2794.
  3. Gasmi, S., Nève, G., Pech, N., Tekaya, S., Gilles, A. & Perez, Y. (2014). Evolutionary history of Chaetognatha inferred from molecular and morphological data: a case study for body plan simplification. Frontiers in Zoology, 11, 84.


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