How Small Is Didinium? 150 µm Compared to Scale | Magnitudle

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Didinium (150 µm) drawn to scale beside a human egg cell (115 µm) and a grain of sand (500 µm) — Drawn to scale, from left to right: Human egg cell (115 µm), Didinium (150 µm) and Grain of sand (500 µm).

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How big is that, really?

About 1.3× the width of a human egg cell
About 2.1× the width of a human hair
About 3 would fit across a grain of sand
About 7.5× the width of a cloud droplet
About 20× the width of a red blood cell

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Facts about Didinium

Didinium is a voracious ciliate predator that can engulf prey, such as Paramecium, larger than itself.

Source: Protist Information Server, Didinium

Micro World

Name	Size	Compared with Didinium
Pine Pollen Grain	70 µm	0.47×
Human Adipocyte	100 µm	0.67×
Euplotes	100 µm	0.67×
Human Cardiomyocyte	100 µm	0.67×
Human Smooth Muscle Cell	100 µm	0.67×
Onion Epidermal Cell	100 µm	0.67×
Didinium	150 µm	this page
Coscinodiscus Diatom	150 µm	same size
Human Purkinje Cell	250 µm	1.7×
Blepharisma japonicum	300 µm	2×

Test your sense of scale

Which is bigger: Didinium or Human Adipocyte?

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