Arachnoiden, located in north-central Massachusetts, supplies tarantulas to hobbyists and resellers. Some of our species are bred by Arachnoiden, and a few by other US breeders. The vast majority of our species are imported from Germany. There, private breeders and arachnologists maintain large numbers of captive-bred lines. Germany’s arachnid shows attract breeders from around the EU. These shows are often where new hobby species are introduced.

You’ll find our species listed alphabetically on a single, scrollable column, subdivided into spiderling, juvenile, semi-adult/subadult, and adult categories. All specimens older than juveniles are sexed. Unless otherwise indicated, specimens are captive bred.

In addition to an interesting selection of species, we try to provide accurate, species-specific information. It is an attempt to influence the hobbyist of tomorrow, to persuade her or him to rely on scientific instinct, to question and seek proof, and not depend on regurgitated dogma passed from one website to another. It is necessarily a work in progress. The information used is collected from a variety of sources, typically overseas breeders, field collectors, arachnologists, original scientific manuscripts, and arachnology texts. The most important statements are referenced.


Starting in the hobby

For those of you new to the hobby, welcome! Here are a few tips to facilitate your venture into the field:

There are many sources of reliable information, but time-tested The Tarantula Keepers Guide (TKG) by Stanley and Marguerite Schultz has helped thousands of hobbyists with the basics. It is worth reading before your first purchase.

Whether you plan to keep one species or one hundred, spiderlings are generally the most economical investment. Like any young animal they require slightly more care. It’s part of the fun. Once you’ve read about the basics, we are happy to answer specific spiderling husbandry questions.

Because female tarantulas live 2-5x longer (or more) than males, collectors prefer females. Tarantulas aren’t easily sexed as spiderlings, but sexing by molt and ventral examination becomes easier and more reliable with increasing size. We are happy to sex molts of spiders purchased here; just send via USPS to the return address on your package.


Sexing and cost

We hand raise spiderlings to a size where sexing is reliable by molt and/or ventral examination. At this point, depending on time constraints, we’ll remove a spiderling species from the website and a short time later list it under females and/or males. Because hobby collectors far outnumber breeders, males are infrequently purchased. We do list and sell males, but most go unsold. Many never get listed. Decreased male saleability and male egg-sac bias, up to 70% in some species, are two reasons why females cost 2-3 times more than their unsexed counterpart.

We enter unsold males into our breeding pool. In the hobby in general it may be inadvisable to buy an ‘unsexed’ tarantula in the 2-3″ range unless you absolutely trust the vendor. It is not uncommon to find males sold as ‘unsexed’ in this size range, especially at shows for some reason. We could do the same. The entire hobby is built on trust however. You know the tiny brown spiderling we’re sending you is what the label claims because you trust us and we trust our exporter. Our unsexed spiderlings and juveniles are truly unsexed.

Sexually mature males are sometimes available. We list molt dates to the nearest day, week, or month.



We use a single, anterior-posterior leg-span measurement with the spider at rest, legs naturally extended. If a size range is given, the higher figure indicates approximate diagonal length span (DLS). Some batches of spiderlings will then confound all attempts by coming in several sizes. It seems to happen more commonly with Poecilotheria spp. raised together for example. So take notice that our best attempts are an approximation. For the new hobbyist there can be more frustration. A 1 1/2″ Xenesthis is a leggy lightweight compared to a 1 1/2″ Grammostola. A 1 1/2 inch Cyriocosmus may be sexually mature. Gradually you’ll learn and grow comfortable with the pitfalls. Meanwhile, please feel free to contact us with questions.


US collectors

We are happy to consider purchasing or trading for any species you’d like to offer, the exception in some cases being species that cannot be identified with certainty by visual inspection. We ask you to include shipping in your proposed offer. We can help with shipping materials and technique for first-time shippers.


US breeders

We are happy to consider purchasing or trading for spiderlings from US breeders. We usually ask for photographs of mother and father and ask you to include shipping in your proposed offer.


Thank you everyone.