Ever since digital cameras became available I have been using them to take natural history pictures. I set out to see how many differnt species I could photograph and identify, and to try and understand how each creature fits into its given habitat. I made this website to display some of the things I've seen. The images were taken in various parts of Australia and noted in the labels. My identifications may not all be right, please dont hesitate to comment if you think i have it wrong
Friday, July 24, 2009
Echinoderms - SEA-STARS & SEA-URCHINS
Tosia labelled wrongly is the same genus but this one is not biscuit sea star (very similar)
The Eight-armed sea-star is very common all around Victoria's coast. There is a great deal of variation in colour. One rock pool can have a number of different colour variations in it. The next few pics shows some of the variations.
This picture and the two below show something very unusual in the world of sea-urchins. This Victorian urchin exhibits parental care. Look closely at this top photo and you can see two juvenile urchins safely lodged in the arms of the parent. The tiny urchins develop on their mothers shell between the spines. While the parent carries these young it apparantly supplies nutriment to the young from its outer shell. The next photos show the underside ( the mouth of the urchin is in the middle where the there are no visible spines). Most of the young (there were about 10 - 12) were situated here.
This urchin is one found in deepeer water. It is not likely to be in a rockpool or washed up on the beach.