Dialipina

Dialipina
Temporal range: Lochkovian to Emsian
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Clade: Osteichthyes
Order: †Dialipiniformes
Nelson, Grande & Wilson, 2016
Family: †Dialipinidae
Schultze, Arratia & Shen, 2026
Genus: †Dialipina
Schultze, 1968
Type species
†Dialipina salgueiroensis
Schultze, 1968
Species
  • †D. markae Schultze, 1992
  • †D. salgueiroensis Schultze, 1968

Dialipina is an extinct genus of prehistoric marine bony fish from the Early Devonian. It is the only member of the order Dialipiniformes and the family Dialipinidae. It contains two species, both known from the high Arctic of Asia and North America. It was initially thought to be and sometimes still is treated as an early, basal actinopterygian, but recent phylogenetic analyses suggest that it may instead be a stem-osteichthyan.

The following species are known:

The early Devonian stem-gnathostome Janusiscus was described from remains from the Siberian mainland that were previously attributed to D. markae.

D. salgueiroensis was initially described in 1968 by Hans-Peter Schultze from isolated scales identified from the Canadian Arctic, and initially interpreted as a paleoniscoid ray-finned fish. Later studies in the same region identified more specimems, including some complete skeletons, allowing for a much better understanding of its anatomy. Based on analyses of complete specimens, Dialipina was different from any other known bony fish, having two dorsal fins and a three-lobed (triphycercal) caudal fin, and appeared to not belong to either ray-finned or lobe-finned fish. In 2026, several authors, including Schultze, would re-analyze the anatomy of Dialipina and taxonomically revise it.

See also

References

  1. 1 2 "PBDB Taxon". paleobiodb.org. Retrieved 2024-08-14.
  2. ↑ Zhao, Wen-Jin; Zhu, Min (1 March 2010). "Siluro-Devonian vertebrate biostratigraphy and biogeography of China". Palaeoworld. 19 (1): 4–26. doi:10.1016/j.palwor.2009.11.007. ISSN 1871-174X.
  3. 1 2 Schultze, Hans-Peter; Arratia, Gloria; Shen, Chenchen (2026-10-21). "Anatomical revision and homology problems concerning the outstanding osteichthyan Dialipina salgueiroensis from the Devonian of the Canadian Arctic". Canadian Journal of Zoology. NRC Research Press. doi:10.1139/cjz-2026-0005. ISSN 0008-4301.
  4. ↑ Ahlberg, Per Erik, ed. (2001-02-15). Major Events in Early Vertebrate Evolution. CRC Press. doi:10.1201/b12434. ISBN 978-1-134-56886-4.
  5. ↑ Zhu, Min; Yu, Xiaobo; Wang, Wei; Zhao, Wenjin; Jia, Liantao (2006). "A primitive fish provides key characters bearing on deep osteichthyan phylogeny". Nature. 441 (7089): 77–80. doi:10.1038/nature04563. ISSN 1476-4687.
  6. ↑ Schultze, Hans-Peter; Cumbaa, Stephen L. (2017). "A new Early Devonian (Emsian) arthrodire from the Northwest Territories, Canada, and its significance for paleogeographic reconstruction". Canadian Journal of Earth Sciences. 54 (5): 461–476. doi:10.1139/cjes-2017-0013. hdl:1807/76893. ISSN 0008-4077.
  7. ↑ Friedman, Matt (January 2007). "Styloichthys as the oldest coelacanth: Implications for early osteichthyan interrelationships". Journal of Systematic Palaeontology. 5 (3): 289–343. doi:10.1017/S1477201907002052.
  8. 1 2 Giles, Sam; Friedman, Matt; Brazeau, Martin D. (2 April 2015). "Osteichthyan-like cranial conditions in an Early Devonian stem gnathostome". Nature. 520 (7545): 82–85. doi:10.1038/nature14065. PMC 5536226. PMID 25581798.