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biology imaging notes

The blastopore of bryozoan embryos

This is a bryozoan embryo exhibiting its blastopore. These animals are discreet but ubiquitous in oceans and lakes all over the world.

Bryozoan embryo during gastrulation revealing its blastopore.
Embryo of the bryozoan Membranipora membranacea under confocal microscopy.

What we see is the DNA inside the nucleus of the cells of the embryo. The color gradient indicates if the nuclei are closer (yellow) or further away (purple) from the microscope camera.

The embryonic cells are arranged in a circle and form a central opening that we call the blastopore. This opening, in bryozoans, will become the mouth of the animal after the embryo develops.

You can follow the process on video or learn more details in the paper.

What about our mouth, where does it come from?

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biology imaging notes

Larva of a lamp shell

Larva of a lamp shell, also known as brachiopod.
Terebratalia transversa (Sowerby, 1846)
Oil on canvas
167.95 µm × 167.95 µm
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biology imaging notes

Cyphonautes day

The name cyphonautes was created by Ehrenberg (1834), who first saw the tiny creature on Nov. 25, 1832 (Hyman 1959).

Cyphonautes larva of the bryozoan Membranipora membranacea.
Cyphonautes larva of the bryozoan Membranipora membranacea after being fed red micro-algae.
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biology notes

Lineus longissimus, the longest worm on the planet

Lineus longissimus, the longest worm in the planet.
Adult specimen of the nemertean Lineus longissimus. This photo is now available in the Wikimedia Commons.
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biology imaging notes

A ribbon worm

Ribbon worm
Adult specimen of Lineus ruber (Nemertea).
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biology imaging notes

The penis worm

Luckily enough, the magnificent “penis worm” has no penis #priapulida

The penis worm (Priapulida).
Adult specimen of the priapulid Priapulus caudatus collected in Sweden.
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biology imaging notes

Surface of the pilidium larva

Pilidium larva of a nemertean
Cilia covering the pilidium larva of a nemertean, a marine invertebrate. Honorable mention at the Olympus BioScapes 2014.
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biology notes

Nemertean laying eggs

Lineus sp
Nemertean Lineus ruber laying eggs
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biology imaging notes

Face to face with the pluteus larva

pluteus
Frontal view of an echino pluteus larva. Image is composed of 122 photos in different focal planes merged into one.

Source: https://commons.wikimedia.org/wiki/File:Frontal_view_of_a_pluteus_larva.tif

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biology imaging notes

Pluteus larva

Pluteus larva of the sea biscuit Clypeaster subdepressus.
Pluteus larva of the sea biscuit Clypeaster subdepressus.