Tailed jellies

 The last of the under-the-wharf pics:

Part sun, part deep shade. Another plumose anemone, a bunch of algae and hydroids, more tunicates, and floating jellies.

These jellies were tiny; an inch across or so. Most of the jellyfish I see around the wharfs are larger, mostly moon jellies, Aurelia labiata, or water jellies, Aequorea spp. Some of these may be water jellies; they're too small and too indistinct to be sure.

But others seem different: 

Three species of jellyfish?

One looks like a cross jellyfish, Mitrocoma cellularia; one could possibly be a red-eye medusa, Polyorchis penicillatus, and could those tailed jellies possibly be sea gooseberries?

There's always something new.

~~~~~~~~~~~~~~~

Estas son las últimas de las fotos de las criaturas debajo del muelle.

Hay otra de las anémonas emplumadas, muchas algas e hidroides, otro grupo de tunicados. Y medusas flotando en el agua, todas muy chiquitas.

Las medusas que comunmente veo por aquí son las medusas "luna", y las "de agua". Pero son más grandes; estas miden 1 o 2 centímetros, por mucho.

Unas parecen medusas "cruzadas", una puede ser la medusa con ojos rojos (y sí, he visto estos ojitos) y tal vez, posiblemente, quizás, las que tienen las dos colas largas pueden ser Pleurobrachia bachei, que no es una medusa, sino un ctenóforo.

Siempre hay algo nuevo.

Edible glass

Another forgotten photo: hydroids on eelgrass in my aquarium.

Tiny, glassy structures waving in the current. Some of the spots are bubbles, but at least a few are the new medusas just released by the hydroid parents.

Ephemeral beauty; the hermit crabs polish off the hydroids overnight, and the millimetre-wide jellies are swept into the pump and smushed into the black ooze.

The orange-brown tentacly circles are anemones on the aquarium wall.

Just another jelly

Looks good enough to eat!

Hydroid medusa, against sea lettuce.

Working late tonight, trying to get a decent photo of a surprising snail. Photos tomorrow, probably.

Red-eye special

My aquarium setup now includes two tanks. In one, the hermits and crabs, a big polychaete worm, four or five kinds of snails, the big (and still growing) anemone from Campbell River, and a varying assortment of temporary visitors all go about their business; eating, mating, climbing, watching me. There's a strong pump with a filter, and a bubbler; everything is constantly in motion.

The other tank is quieter. I don't stir it up; there's no filter, just a smaller bubbler. Here amphipods and copepods breed happily, without being swallowed by the filter. Here, too, the occasional miniature snail or hydroid appears, seemingly out of nothing. It's a good place for babies.

A couple of times, I've seen a transparent bubble with tentacles resting on the glass. Tiny things; I had to bring out the microscope to see the bubble part. A few days ago, I saw a larger one, and thought it might be big enough now to handle the active tank.

One of the first photos.

Here it is, from the bottom, parked on the glass, tentacles streaming in the current. The circle is about 3 mm. across. In the center (the "yolk" of the "egg") is the column, seen from the bottom. The tentacles sprout from nine radiating arms; they're beaded all along their length.

To the naked eye, the whole thing is transparent jelly; the colour comes from the lighting and the background.

Disturbed, the critter bounces away, and swims, bubble first, tentacles following behind. It's really cute to watch, almost impossible with my equipment to photograph. Imagine one of those deep, transparent umbrellas with streamers hanging from all the tips. Now, watch it swim by opening and shutting itself. With each quick closing, it zooms off in a different direction, completely unpredictable. It coasts for half a second, then opens-shuts, and it's gone.

Resting on sea lettuce. Side view, showing the bell and the central workings.

I think this is a baby Red-eye jellyfish, Polyorchis pencillatus. ( I could easily, easily, be wrong.) These are common on our coast, growing to about 3-4 inches high. They are mentioned on several sites in eelgrass beds; that's probably how they have come to my tanks, riding the eelgrass that I collect for the hermits' jungle gym.

The tentacles can shrink or stretch to much longer than the bell. I saw this happen a couple of times, when the swimming jelly miscalculated and swam into the tentacles of a small anemone on the wall. The anemone didn't try to reel it in, and after a few minutes, the jelly extricated itself, and dropped to the bottom of the tank. I thought it was dying, but it recovered right away and swam off. But for several minutes, the tentacles were shrivelled and twisted.

Look at the base of the arms; see those dark dots? They are eyespots, red when the light is right, which gives the species its English name. They don't see much, but they are light sensitive, helping the jelly to orient itself. Two similar local species do not have these spots.

Side view, showing central column.

Usually, at least when I've been looking, the central section is a column the entire height of the bell. In most photos of mature specimens, it's a tangle of organs dangling from the central top.

It's been in the big tank for 3 days now, and seems content. Right now, it's riding the eelgrass.

Look what I found!

This showed up on the wall of the aquarium a couple of days ago.

Unidentified medusa, about 3 mm. across bell.

More photos and the complete story, tomorrow.