Glass Sponges Hexactinellidea Silicon Dioxide spicules Syconoid No cell wall Only marine
Some lovely solitary Anthopleura in our wet lab. Note the striped lines radiating out from the central disc in the specimen on the left. Those lines are a good feature to distinguish Anthopleura sola, the warmer water species from Anthopleura xanthogrammica, the colder water species. Both now occur commonly on our local coast and you will… Continue reading Anemones in the wet lab
Check out this link to view footage of annelids in action!
Alitta virens can also use its proboscis to burrow. First it thrusts its head into the sand and then anchors its body with the use of coelomic fluid, muscles and chaete. Muscle contractions are used to bring the body forward and continued extension/retraction of the proboscis allows the Annelid to burrow deeper into the sand.
Just wanted to share something really cool I snapped a picture of in lab (Figure 1) on September 6th. Once I cut my sea urchin open, I got a really good look at some interesting structures!
I love how you can clearly see Aristotle’s Lantern under the dissection microscope, highlighted by the blue arrow. You can also get a really nice view of the it’s digestive tube, if you look at where the red arrow is pointing. My favorite part is definitely the “teeth” structures highlighted by the yellow arrow.
I remember talking about “urchin barrens” where unchecked sea urchins grazed kelp forests to nothing. It’s really interesting how these teeth structures, to my eye, don’t appear how I would normally expect an herbivore’s teeth to look–I would typically look for broad and largely flat like a cow’s teeth. Really cool stuff!
Does anyone see anything I missed?