Home | Field studies and notes | Assassin Bugs – Captive Care and Notes on Spider-Hunting Assassins – Part 1

Assassin Bugs – Captive Care and Notes on Spider-Hunting Assassins – Part 1

Assassin BugAssassin Bugs, while not the best known of invertebrate pets, are actually quite popular with insect specialists and in public collections.  I began working with 2 African species in the early 80’s, and soon built up a collection of native forms as well.  Recent studies at Australia’s Macquarie University have revealed that one Assassin Bug captures spiders by tweaking their webs in imitation of a trapped insect.  I’ll cover the care of some commercially available Assassin Bugs in Part 2.

Hunting the Hunters

Assassin Bugs are predatory insects of the Order Hemiptera (insects with piercing mouthparts).  Most lie in wait for invertebrates to stray within reach, others feed upon blood, and a few employ elaborate ruses in order to trick their prey within striking range. 

The Australian species studied at Macquarie University lures spiders close by plucking at their webs.  As anyone who has tried to lure a spider out of hiding knows (yes, I have tried…often and in many places!), they can be quite discriminating in deciding what sort of disturbance to investigate. Analysis of the web vibrations produced by Assassin Bugs revealed that they exactly matched those made by a trapped insect.  This hunting strategy, known as Aggressive Mimicry, is used by certain spiders but had not been observed in insects.

Bait-Users and Blood-Suckers

Other species of Assassin Bugs hold dead termites in their jaws when hunting.  This either hides the Assassin or encourages other termites to investigate, there by assuring the hunter an easy meal.

While doing some work at an insectarium in Ohio, I had the chance to observe Assassin Bugs that fed upon mammal blood.  However, providing a live mouse to a hoard of ravenous insects was not deemed a suitable public exhibit, so the little beasts were held for behind-the-scenes study (blood-feeding Assassins spread Chagas Disease and other serious illnesses).
Assassin Bug Nymph

Assassins in Captivity

West Africa’s White-Spotted Assassin Bug (Platymeris biguttatus) and the Red-Spotted Assassin (P. rhadamanthus) of East Africa are the species most commonly offered for sale in the USA.  I’ll cover their care in Part 2 of this article.

A number of North America’s many native species make fascinating terrarium subjects as well, although none are as easy to breed or as are the African imports.  The East Coast’s 1.5 inch Wheel Bug (Arilus cristatus) is, however, very interesting and well-worth some attention from insect fanciers (please see photo)…more on these and other species in Part 2.

Further Reading

Care and Natural History of the Red-Spotted Assassin Bug .

Videos of a wide variety of Assassin Bugs.


Assassin Bug Nymph image referenced from wikipedia and originally posted by Aurelius787

About Frank Indiviglio

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Being born with a deep interest in animals might seem unfortunate for a native Bronxite , but my family encouraged my interest and the menagerie that sprung from it. Jobs with pet stores and importers had me caring for a fantastic assortment of reptiles and amphibians. After a detour as a lawyer, I was hired as a Bronx Zoo animal keeper and was soon caring for gharials, goliath frogs, king cobras and everything in-between. Research has taken me in pursuit of anacondas, Orinoco crocodiles and other animals in locales ranging from Venezuela’s llanos to Tortuguero’s beaches. Now, after 20+ years with the Bronx Zoo, I am a consultant for several zoos and museums. I have spent time in Japan, and often exchange ideas with zoologists there. I have written books on salamanders, geckos and other “herps”, discussed reptile-keeping on television and presented papers at conferences. A Master’s Degree in biology has led to teaching opportunities. My work puts me in contact with thousands of hobbyists keeping an array of pets. Without fail, I have learned much from them and hope, dear readers, that you will be generous in sharing your thoughts on this blog and web site. For a complete biography of my experience click here.
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