Showing posts with label appendage regeneration. Show all posts
Showing posts with label appendage regeneration. Show all posts

Wednesday, January 13, 2021

Brand new legs

My kelp crab molted last week. The first thing I noticed was that the rose seaweed he had been wearing as a hat, and which by now had grown to almost his full length, was gone. He was hatless.

When he came up to the glass the other day, all clean and now wearing a tiny new hat, I saw another change.

Newly molted kelp crab

He has all his legs. For the last couple of months, he has been missing the second to the last legs on either side. Now, with the molt, he has grown them back. They seem to be a bit smaller than the others; usually they decrease in size front to back. That should be fixed with the next molt. If he keeps out of fights.

Closer. Those eyes!

The eyes are on stalks, like all crab eyes; these are round, with a slightly astonished look.

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Mi cangrejo kelp hizo una muda la semana pasada. Ahora lleva un caparazón y extremidades nuevos. Lo primero que vi es que el "sombrero" que llevaba, hecho de algas color de rosa, y que ya había logrado un tamaño casi tan grande como el del cangrejo mismo, había desaparecido. Andaba sin gorro.

Cuando pasó cerca del vidrio el otro día, noté que ya trae su nueva decoración. Y hay otro cambio.

Tiene todas sus patas. Durante los últimos meses, le faltaba una de cada lado; la penúltima, contando desde la cabeza. Ahora, con la muda, las ha regenerado. Son un poco más cortas que las otras; normalmente, disminuyen en tamaño, empezando con las primeras, que son las más largas. Después de la próxima muda, habrán recuperado su tamaño normal. Si es que se porta bien y no se mete en más pleitos con sus vecinos.

Los ojos se llevan en pedúnculos, como los de todos los cangrejos; estos son redondos, con una mirada tal vez un poco asombrado.


Tuesday, August 06, 2019

Meanwhile, back in the tank ...

I've been too busy; travelling, running errands, catching up on paperwork (a form of procrastination to put off dealing with more challenging paperwork), gardening; all the things I do during a "lazy" summer. Sometime, weeks ago, I took a break and sat down by the aquarium to visit the hermits. And forgot to post the photos.

So here they are. Hermits and a crab.

Poor crabby. He must have tangled with one of the larger crabs, probably trying to hold onto his supper. He's lost a pincer. Luckily, he's got plenty of legs and mouthparts that can serve as spoons and forks, and the next molt, he'll get his pincer back.

Deep in the tank, colours are muted. It's like seeing through a light fog. Here, a hairy hermit looks back at me from her perch on Pacific rose seaweed growing on a stiff red alga. Pacific rose can grow from fragments left after it has been weeded out. I tear out whole handfuls every time I change the water.

A grainy hand hermit with colourful algae decorating his shell..

One of the tiny orange hermits in a brand-new shell. The seaweed here is broken, half-rotted rockweed. Good eating, the hermits say.

Grainy hand hermit (left) and small hairy hermit (right) on eelgrass.

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