Lehnert, H.; Stone, R.P. (2019). Two new species of Geodiidae (Porifera, Demospongiae, Astrophorina) from the Emperor Seamounts, North Pacific Ocean. Zootaxa. 4671(3): 381-395.

355731

10.11646/zootaxa.4671.3.4 [view]

Lehnert, H.; Stone, R.P.

2019

4671(3): 381-395

Publication

http://zoobank.org/urn:lsid:zoobank.org:pub:79CA3574-90EA-4A82-8202-34242BF63D2B

Two new species of Geodiidae from the Emperor Seamounts, North Pacific Ocean are described and compared to congeners. Erylus imperator n. sp. differs from all other species of Erylus from the region in having large oxyasters, in only one other species from which it differs in several other characters. Furthermore these oxyasters most often display the tendency to reduce the number of rays to a degree that they appear as triods, microxeas or even microtylostyles, depending on the number of retained rays. The second new species, Geodia arma n. sp. is a Geodia without triaenes, a group formerly described under the genus Geodinella. We compared G. arma n. sp. with all congeners lacking triaenes and determined that it is the only known species with a cortex of up to 6 mm in thickness and also the only species with oxeas up to 6 mm in length Which range from thin and sinuous to thick and straight. To our knowledge these are the first descriptions of sponge species from the Emperor Seamount region.

Boreal Pacific

Systematics, Taxonomy

Porifera

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