Meridiastra mortenseni

Meridiastra mortenseni
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Echinodermata
Class:	Asteroidea
Order:	Valvatida
Family:	Asterinidae
Genus:	Meridiastra
Species:	M. mortenseni
Binomial name
	Meridiastra mortenseni; O'Loughlin, Waters & Roy, 2002
Synonyms
	Patiriella mortenseni

Meridiastra mortenseni is a sea star of the family Asterinidae endemic to New Zealand. Discovered as a new species in 2002,[1] it is named after T. Mortensen, who recorded it as distinct from Patiriella regularis, the New Zealand common cushion star, in 1925.[2] According to genetic evidence, P. mortenseni as moved from the Patiriella genus to Meridiastra in 2004.[3]

Reciprocal transplant experiments in Fiordland have shown it is less tolerant of hyposaline conditions than the sympatric (but distantly related) P. regularis. This is reflected in its distribution: it lives in deeper waters (at depths of roughly 10±3 m in Milford and Doubtful Sounds), below the low salinity layer.[4] In laboratory conditions, they die after 24-hour exposure to water with salinities below 25‰.[4]

References

O'Loughlin, P. M.; Waters, J. M.; Roy, M. S. (2002). "Description of a new species of Patiriella from New Zealand, and review of Patiriella regularis (Echinodermata, Asteroidea) based on morphological and molecular data". Journal of the Royal Society of New Zealand. 32 (4): 697–711. doi:10.1080/03014223.2002.9517716. S2CID 84807132.
Mortensen, T. 1925: Echinoderms of New Zealand and the Auckland-Campbell Islands. III-V. Asteroidea, Holothurioidea, Crinoidea. Videnskabelige Meddelelser fra Dansk naturhistorisk Forening i København 79: 261–420.
O'Loughlin, P. Mark; Waters, Jonathan M. (2004). "A molecular and morphological revision of genera of Asterinidae (Echinodermata: Asteroidea)". Memoirs of Museum Victoria. 61: 1–40. doi:10.24199/j.mmv.2004.61.1.
Barker, M.F.; Russell, M.P. (2008). "The distribution and behaviour of Patiriella mortenseni and P. regularis in the extreme hyposaline conditions of the southern New Zealand fiords". Journal of Experimental Marine Biology and Ecology. 355: 76–84. doi:10.1016/j.jembe.2007.12.001.

Data related to Meridiastra mortenseni at Wikispecies

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[1] O'Loughlin, P. M.; Waters, J. M.; Roy, M. S. (2002). "Description of a new species of Patiriella from New Zealand, and review of Patiriella regularis (Echinodermata, Asteroidea) based on morphological and molecular data". Journal of the Royal Society of New Zealand. 32 (4): 697–711. doi:10.1080/03014223.2002.9517716. S2CID 84807132.

[2] Mortensen, T. 1925: Echinoderms of New Zealand and the Auckland-Campbell Islands. III-V. Asteroidea, Holothurioidea, Crinoidea. Videnskabelige Meddelelser fra Dansk naturhistorisk Forening i København 79: 261–420.

[3] O'Loughlin, P. Mark; Waters, Jonathan M. (2004). "A molecular and morphological revision of genera of Asterinidae (Echinodermata: Asteroidea)". Memoirs of Museum Victoria. 61: 1–40. doi:10.24199/j.mmv.2004.61.1.

[Barker-4] Barker, M.F.; Russell, M.P. (2008). "The distribution and behaviour of Patiriella mortenseni and P. regularis in the extreme hyposaline conditions of the southern New Zealand fiords". Journal of Experimental Marine Biology and Ecology. 355: 76–84. doi:10.1016/j.jembe.2007.12.001.