Tarantulas and other arachnids


Arachoiden supplies tarantulas and other arachnids from around the world to hobbyists, breeders, and resellers. We are located in Massachusetts. The majority of our species are imported regularly from Germany, always in accordance with USFW and US Customs regulations. Imported or subsequent US captive-bred, we provide novel species and guaranteed lineage spanning the range of spiderling, juvenile (Jvn), semi-adult (SeA), subadult (SA), adult male (AM), adult female (AF).

The tarantula keeping and breeding hobby is moving quickly. As many of you know, numerous described species, especially those described before the late 1900s, are in need of redescription. Many of the newest most exciting species have not yet been described. We use traditional scientific nomenclature for described and undescribed species. Errors in hobby-based identification and nomenclature are widespread. Common names, perpetuated seemingly by profiteers, introduce further confusion and error. One of our goals is to point out naming errors and inaccuracies where we find them, and help pave the way for scientific names to supercede whimsical common names.

Please check to see if a photo and text accompany the species in which you have interest. The text provides species-specific information and explains hobby-wide errors in identification and naming. The information used is collected from a variety of sources, typically overseas collectors, breeders, exporters, and arachnologists. Additional sources include original scientific manuscripts, hobby and arachnology textbooks, and the Journal of the British Tarantula Society. What we don’t know far exceeds what we do—we more than welcome information from any interested party and attribute facts and photos used in a posting.

Feel free to use the Contact tab or Facebook page for questions, ideas, comments, reviews, photos, whatever strikes your fancy: https://www.facebook.com/arachnoiden/.


Buying Guide


For those of you new to the hobby, welcome! Here are a few tips to facilitate your venture into this exciting 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 economic investment. The main downside is slightly increased care requirements versus juveniles and adults of the same species. It can take several months to raise a spiderling to the juvenile stage. Many, including the author, value these months as an opportunity to observe the full life-cycle of a species. We are happy to provide customers advice regarding spiderling husbandry.

Tarantulas aren’t easily sexed as spiderlings, but with increasing size, sexing by molt or ventral examination becomes easier and more reliable. Upon reaching reproductive age, or adulthood, males generally live for only another year. Females live for many more years, upwards of 25 for some species. Collectors typically prefer females, whilst breeders obviously prefer both sexes. From a hypothetical 50:50 sac, a randomly chosen spiderling has a 50% chance of being female. Two spiderlings increase the odds of one female to about 75%. With three the odds are close to 90%. Emerging data on tarantula egg sac sex ratios however, is making this statistic problematic. Sometimes there appears to be male bias, upwards of 60-70%, depending on species and perhaps other factors. More on this subject as we learn it.

If you decide to purchase larger specimens, possibly to eventually pair with a tarantula already in your possession, you will notice we have different sizes of several species. After you have confirmed we have your species, you will want to know size. We prefer a single, anterior-posterior leg-span measurement with the spider in it’s most common rest position. Depending on instar, leg proportion, and species behavior however, a range measurement may better convey size. For example, a tarantula with a 4 cm body could be advertised as being 2″ (legs flexed), 2 1/2″ (legs partially extended), or 3″ (legs fully extended). In some cases we report a size range, from legs partially extended to legs fully extended. Both of these are necessarily soft endpoints, but they encompass the two methods most US hobbyists use today. In the case of spiderlings, length differences in resting positions are very small and perhaps not so useful. Size ranges in the case of spiderlings generally reflect instar (e.g., 2i – 3i).

With adult males (AM) we list molt dates when available. Knowing when a male is penultimate (subadult (SA)) can be tricky. Size can be helpful, but exceptions abound. As with males, females sometimes mature at unexpected sizes. Upon sexual maturation, young adult females generally have potential to increase in size with further molts.


Sliding-scale Volume Discount


We have decided to continue with sliding-scale, volume-discount purchasing. The more you buy the more you save. The scale starts with a 5% discount at $100. Higher discounts for larger purchases reach a maximum 25% for purchases of $300 or more. Discounts are automatically calculated by our shopping cart calculator when you add items to the cart.


Bulk purchasing


Bulk purchasing is available to everyone. With 10x bulk, the discounted prices may be better than can be achieved with the sliding scale. Moreover, bulk purchases will apply to the sliding scale discount for non-bulk species. Specimens offered in bulk tend to be spiderlings bred in the US, either by Arachnoiden or by trusted US breeders.The list will always be in flux, depending on availability.


Non-discounted specimens


The sliding-scale discount will not apply to specimens in this category, but as for bulk, purchases from this category will apply to the regular sliding-scale discount.


Thank you everyone.