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The Orange (or Guyana) Spotted Roach, Blaptica dubia: an Interesting Pet and Valuable Food for Reptiles, Amphibians, Invertebrates, Birds and Fishes – Part 3

Note: Please see Part I and Part 2 for further information on the captive care and natural history of this insect.


Social Grouping

The orange-spotted roach is sexually dimorphic – males have full wings (but rarely if ever fly), while females have only wing-stubs.  A ratio of 1 male per 3-5 females is ideal…excess males should be preferentially used as food for your collection.  Maintaining the roaches at this ratio will provide for a great deal of social interaction (please see Part I, Captive Habitat) and increased reproduction.

Males attempt to bluff intruders onto their territories by rising up on their legs and fluttering the wings.  If this fails, a shoving match will ensue, with the loser retreating intact (well, except for his pride!).

Captive Longevity

The life cycle is 18 months to 2 years…but this is not well documented.  Please keep notes and pass along anything new you might learn.


Fertilization is internal, via a sperm packet deposited by the male.  Females produce the typical roach oothecum, or egg case, but retain it internally for a gestation period of approximately 1 month.

The young, 20-30 in number, are born alive and reach sexual maturity in 3-4 months (this varies with temperature and stocking levels).


The reduced wing size in female orange-spotted roaches (and similar species) is attributed to paedomorphosis, or the retention of juvenile characteristics, rather than to wing growth inhibition.

Flight muscle is, metabolically, one of the most active of animal tissues, and very “expensive” to support.  It is theorized that the resources put into maintaining the flight muscles may, in roaches, take away from reproductive potential.  In other words, female roaches are, in essence, “trading” flight for the ability to produce additional eggs.  Males of some species are though to retain the power of flight so as to be able to cover more ground when searching for mates.

A description of the journal Cockroach Studies, along with photos of long-winged and wingless species, is posted at:


Image referenced from Wikipedia, here.

The Orange Spotted Roach: an Interesting Pet and Valuable Food for Reptiles, Amphibians, Invertebrates, Birds and Fishes – Part 1

Orange-Spotted RoachHello, Frank Indiviglio here.

The orange-spotted or guyana roach, Blaptica dubia, often starts out as pet food but winds up as a pet. It’s small wonder, as these attractive insects are very interesting in their own right, and most agreeable to exhibiting their natural behaviors to the patient observer.

Coming into Their Own

Roaches are finally getting the attention they deserve from pet keepers, and even zoos are beginning to highlight them in exhibits.  I housed many species at the Staten Island Zoo, and a new exhibit at the Bronx Zoo features a hollow tree stocked with thousands of Malagasy hissing roaches.  But my favorite was set up many years ago at the Cincinnati Zoo’s groundbreaking Insectarium….visitors looked through a cutaway cabinet at a “kitchen” stocked with a colony American roaches.  The huge insects were fed from cereal boxes, sandwiches left on a table and so forth…years later I tried to replicate this at the Bronx Zoo, for Norway rats, but the idea failed to impress my curator!

Classification and Diversity

Cockroaches, with a fossil record stretching back 300 million years, are classified within the order Blattaria (or Blattodea).  Over 4,000 species have been described, and entomologists believe that as many more may be awaiting discovery.  The largest species, Latin America’s Megaloblatta baberoides, sports a 7 inch wingspan while the heaviest, Macropameothia rhinoceros of Australia, weighs in at 1 ½ ounces.  The lime green banana roach, Panchlora nivea, sometimes available in the pet trade, is to my eye the most attractive.

Orange-Spotted Roaches

The orange-spotted roach ranges from tan to reddish-brown and black in color, and is mottled with light orange dots.  It reaches 1 ¾ inches in length.  The natural range is usually given as northern South America, but there are records from as far north as Panama and as far south as northern Argentina.

As a Feeder Insect

This roach makes an excellent feeder insect as it rarely flies and cannot scale glass or plastic (unless either is very dirty!).   Adults and juveniles alike have a soft exoskeleton, and are thus an ideal food for amphibians, birds, spiders, scorpions, fishes, reptiles and certain small mammals (I have used them as treats for flying squirrels and deer mice).  The nymphs are only .1 inches in length, and eagerly accepted by tiny amphibians and reptiles.


Note: long term exposure to insect colonies may lead to sensitivities or allergies in some people.  You may wish to consult your doctor in this regard.

Captive Habitat

The Enclosure

Orange spotted roaches can be housed in plastic terrariums, aquariums or sweater boxes.  Sweater boxes should be ventilated with screened-over panels cut into the lids and sides.  Fine-meshed “insect screening” is best, as the nymphs are quite small.  Be sure that the mesh size on commercial terrarium lids is small as well – if unsure, add a second layer of finer mesh.  The roaches can chew through some plastic screening, so use metal when re-screening.

Heat and Humidity

This species tolerates temperatures from 68-95 F, with breeding and growth being most rapid at higher temperatures.  If you are interested in observing them, and not in producing large numbers as a food source, 75 F is ideal.

Heat may be provided by an incandescent bulb during the day and a reptile night light during the evening.  I highly recommend the latter…the roaches will feed by day, but really put on a show at night, and a night light will allow you to observe them doing so.  A ceramic heater or under-tank heater may also be used.  In all cases watch that you do not over-dry the terrarium (keep an eye on shedding, please see below).

Orange-spotted roaches tolerate far drier conditions than do most of their relatives.  Technically, they can run into difficulty in molting if a bit of humidity is not provided, but this is not common.

Misting the enclosure can result in the growth of mold and fungi, some species of which may be linked to colony failure.  If conditions warrant it, mist lightly (glass only, not cardboard if such is used as a substrate) and be sure the glass dries within an hour or so.

Click: The Orange Spotted Roach: an Interesting Pet and Valuable Food for Reptiles, Amphibians, Invertebrates, Birds and Fishes – Part 2, to read the second part of this article.

Image referenced from Wikipedia Commons, here.

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