Six - Armed Comb Star

Discuss natural history subjects not strictly related to birds. Reports of interesting mammal, reptile, and invertebrate sightings are welcome.
Pat Miller
Posts: 176
Joined: Tue Sep 04, 2012 9:36 am

Six - Armed Comb Star

Postby Pat Miller » Tue Jun 02, 2020 9:46 pm

download/file.php?mode=view&id=8975https://www.birdingnz.net/forum/download/file.php?mode=view&id=8974
I found this six armed Comb Star Astropecten polyacanthus today on Uretiti Beach. This is usually a five pointed starfish and I have never seen a 6-armed one before. There were many normal ones and also a lot of Luidia varia washed up at low tide after the stormy easterly weather of the weekend. The Comb Star was about 20 cm in diameter and the Luidia ranged from 25 - 40 cm in diameter.

I haven't posted photos before, so I hope this was worked.
Cheerio
Pat
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Finn Davey
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Joined: Thu Feb 20, 2020 9:38 am
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Re: Six - Armed Comb Star

Postby Finn Davey » Tue Jun 02, 2020 11:05 pm

I wonder if it used to be a 5 armed one but got injured.
Sometimes the body may think it's lost an arm and grows a new one, but the old arm is still there so it heals back.
Pat Miller
Posts: 176
Joined: Tue Sep 04, 2012 9:36 am

Re: Six - Armed Comb Star

Postby Pat Miller » Wed Jun 03, 2020 9:07 am

Yeah I know, but this looks too perfect for that scenario. Think lizards & tuatara - when they regenerate their tails the regenerated part is never the same as the original. This I think is just a freak, but skimming through all the photos online of this species and not finding any other examples, a rather unusual one.

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