If you're interested in using any of these photographs or this content in any way, please contact me. Send an e-mail to naturalhistoryphotos(at)gmail.com. Thanks!
Showing posts with label urchin. Show all posts
Showing posts with label urchin. Show all posts

Sunday, November 11, 2012

Anemones & friends

Just back from a meeting in Monterey, CA, but we were able to take a quick field trip to the Big Sur coast this afternoon before heading north.


This shallow tidepool offered an especially nice view of Giant Green Anemones (Anthopleura xanthogrammica), Purple Sea Urchins (Strongylocentrotus purpuratus) of various sizes, and a few species of pink coralline algae.  There's also a tiny bit of bright orange sponge (below the large anemone).  And if you look closely, the small dark holes scattered around the urchins belong to a colonial tubeworm (Dodecaceria sp.).

Wednesday, November 7, 2012

Not so itsy bitsy


I wish I had taken these photos in late October.  I was just a little late for Halloween!


I'll also admit that I'm a little squeamish around large spiders.  [This individual was ~2 cm (3/4 inch) long.]  But if I can watch them from a distance, I'm intrigued by their variety of shapes and sizes, color patterns and life histories.

This species is quite visible right now in low grassy areas on Bodega Head.  It creates a large orb web and tends to sit in the center or near the top edge. 

Some have very large, swollen orange abdomens (see next two photos). 



On the dorsal (upper) surface, there are noticeable white spots, some with pupil-like markings similar to cats' eyes.


Below, there is a beautiful combination of burnished orange bordering iridescent metallic purple.  (I'd like a sweater with those colors!)


In the photo above, note the spinnerets (silk-spinning structures) at the tip of the abdomen.  They are black with a yellow ring at the base and are arranged in a tight circle.

This might seem crazy, but they reminded me of sea urchin teeth!  Urchins have five pointed teeth that come together for grazing on algae (see below).  Drawing parallels between spider spinnerets and sea urchin teeth — see what happens when you spend time in both terrestrial and marine environments!

(This urchin skeleton, missing most of its spines, washed up on the beach in January 2009.)

Back to the spider...I tried to figure out which species it is, but so far I haven't had much luck.  I'm wondering if it's in the genus Araneus, but if anyone out there can help with an identification, I'd be grateful!


Thursday, April 26, 2012

Reds and purples

Sometimes there seems to be a color scheme for the day.  Today I helped Eric with field work at Van Damme State Park in Mendocino County.  Between tasks I took a few photos, where reds and purples kept appearing.

Red Urchin (Strongylocentrotus franciscanus) among Purple Urchins (S. purpuratus)


Close-up of a Gumboot Chiton (Cryptochiton stelleri)


A very small (~1 cm across) Ochre Seastar (Pisaster ochraceus)


 An elegant scale worm in a shallow pool (not certain of the species)



The day started with an intense squall line approaching from the horizon.  It moved very quickly across the ocean towards land.  I barely had time to take this picture before it started to pour!