| Decapodiformes Temporal range:
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|---|---|
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| Juvenile cephalopod from plankton, Antarctica | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| (unranked): | Neocoleoidea |
| Superorder: | Decapodiformes Leach, 1817[2] |
| Orders | |
|
See text | |
| Synonyms | |
| |
Decapodiformes is a superorder of Cephalopoda comprising all cephalopod species with ten limbs, specifically eight short arms and two long tentacles. It is hypothesized that the ancestral coleoid had five identical pairs of limbs, and that one branch of descendants evolved a modified arm pair IV to become the Decapodiformes, while another branch of descendants evolved and then eventually lost its arm pair II, becoming the Octopodiformes.
Taxonomy[edit]
The following orders are recognised in the superorder Decapodiformes:[3]
- Bathyteuthida
- †Belemnitida
- †Diplobelida
- Idiosepida
- Myopsida – coastal squid
- Oegopsida – neritic squid
- Sepiida – cuttlefish, pygmy, bobtail and bottletail squid
- Spirulida – ram's horn squid
References[edit]
- ^ see Boletzkyida, Belemnite
- ^ Young, R. E., Vecchione, M., Mangold, K. M. (2008). Decapodiformes Leach, 1817. Squids, cuttlefishes and their relatives. in The Tree of Life Web Project
- ^ "WoRMS – World Register of Marine Species – Decapodiformes". www.marinespecies.org. Retrieved 2023-03-23.
Further reading[edit]
- Young, Richard E.; Vecchione, Michael; Donovan, Desmond T. (1998). "The evolution of coleoid cephalopods and their present biodiversity and ecology". South African Journal of Marine Science. 20 (1): 393–420. doi:10.2989/025776198784126287. abstract
External links[edit]
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction