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Product description

Test small objects to find out If they are a potential choking hazard for infants or toddlers. If a toy is small enough to fit through the opening in the Choke Tube Tester, it could pose a choking hazard for children under the age of 3. Set of 3 Choke tubes. Choke tubes are also sold individually. Manufactured by Becker's School Supplies - Education. Made in China.

Becker's Exclusive Kits - SF12601K School Supplies Choke Tube Se

Diatoms of North America

Diatoms of North America

Diatoms of North America

Diatoms of North America

Become a taxon contributor Learn more

Diatoms of North America is a collaborative work in progress, growing and changing as science advances.

Taxa by Morphology

New to diatoms? Jump into diatom identification using the visual key.

What are Diatoms?

Diatoms are single-celled algae that live nearly everywhere there is water - streams, ponds, lakes, oceans, and even soils.


For practitioners

Taxon
Identification Guide

Genera

Classification information, citations, links and species listings for 165 genera completed to date.

Species

Identification guides, original descriptions, citations, autecological information and more for 1008 species and growing.

We encourage new contributors to submit taxon pages.

This project depends on many people to document the diverse diatom flora of streams, rivers, wetlands, lakes, springs, soils, estuaries and coastal zones.

Recent News & Projects

Diatom Web Academy 2021

The Diatom Web Academy continues... Sessions are recorded and can be accessed for later viewing. You are invited to join us, wherever you may be,...

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What has changed?

Here, you can find links to archived genus and species pages: Achnanthidium kreigeri (prior_to_2021_09_01) Pinnularia polyonca (prior_to_2021_08)...

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Diatoms of North America has been developed in part with the generous funding and support of US EPA, USGS, the Institute of Arctic and Alpine Research at University of Colorado Boulder and other organizations.