''Calispadella'' is a
genus
Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...
of
chaetognaths
The Chaetognatha or chaetognaths (meaning ''bristle-jaws'') are a phylum of predatory marine worms that are a major component of plankton worldwide. Commonly known as arrow worms, they are mostly pelagic; however about 20% of the known species ...
in the
family
Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...
Spadellidae. It consists of one species, ''Calispadella alata'' Casanova & Moreau, 2005.
[ It is differentiated from other species of Spadellidae by the presence of an unusually long tail segment and a rare aspect of the lateral fins, similar to that of '' Paraspadella gotoi'' Casanova, 1990.][ It was the first to be described exclusively in the range of deep-sea hydrothermic vents.][Hernández-Flores, R., McLelland, J. & Suárez-Morales, E. (2009)]
Planktonic Chaetognatha of the Gulf of Mexico.
In: Felder, D. L. & Camp, D. K. (eds.), ''Gulf of Mexico Origin, Waters, and Biota'' (vol. 1, pp. 1165–1173). College Station: Texas A&M University Press.
Although most of the species who live in ocean depths have delayed sexual maturity, ''Calispadella alata'' have their seminal vesicles already well developed. While they live in the ocean, they can also mate in populations that have limited resources since they are sexually precocious.
References
Chaetognatha
Monotypic protostome genera
{{Chaetognatha-stub