Blaberus discoidalis

Serville, 1838

discoid cockroach, tropical cockroach, West Indian leaf cockroach, false death's head cockroach, Haitian cockroach, drummer

Blaberus discoidalis is a large in the Blaberidae, native to Central America and the Caribbean. measure 35–45 mm and are tan with a distinctive dark brown to black pronotal patch that resembles the death's marking of Blaberus craniifer, hence the "false death's head cockroach." The is gregarious and has been extensively studied in laboratory settings for its locomotion, sensory processing, and social . It is widely used as feeder insects for captive reptiles and amphibians due to its ease of rearing and nutritional profile.

Blaberus discoidalis 0006 L.D by Acrocynus. Used under a CC BY-SA 3.0 license.

Blaberus discoidalis ootheca by Kolonie BLABERUS. Used under a CC BY-SA 4.0 license.

Blaberus discoidalis 0008 L.D by Acrocynus. Used under a CC BY-SA 3.0 license.

Pronunciation

How to pronounce Blaberus discoidalis: //ˈblæbərəs ˌdɪskoʊˈdaɪlɪs//

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Identification

are distinguished from similar Blaberus by the dark pronotal patch, which is less defined than the skull-like marking of B. craniifer (true death's ). Adults possess wings but are not active fliers. Juveniles are brown with tan speckles and lack wings. The species cannot climb smooth vertical surfaces, a trait useful for distinguishing it from many other cockroach species in captivity.

Images

Habitat

Native to tropical and subtropical environments including limestone caverns, hollow trees, and damp forest floors. Has been introduced to Florida.

Distribution

Native range includes Jamaica, Cuba, Hispaniola, Puerto Rico (including Vieques Island), Panama, Colombia, Venezuela, and Trinidad and Tobago. Introduced and established in Florida, USA.

Diet

, consuming decaying organic matter. Gut (Blattabacterium) enable nitrogen recycling from nutrient-poor plant material. Specific dietary preferences in wild are not well documented.

Life Cycle

Juveniles mature to adulthood in 4–5 months under favorable conditions. Females reach breeding age at approximately 6 months when maintained at 85–90°F. Females carry in a pouch (genital chamber and vestibulum) until fertilized by male .

Behavior

Gregarious; exhibits context-dependent behavioral plasticity in light avoidance (negative ). Individual variation in light-avoidance performance emerges in group settings but not in isolation, with some individuals avoiding light 75% of the time and others near chance (~50%). Uses for obstacle detection and negotiation; antennal contact determines whether to climb over or tunnel under obstacles. Visual input from ocelli biases path selection toward tunneling in light conditions. Running speed is approximately 25 body lengths per second, roughly half that of Periplaneta americana.

Ecological Role

Decomposer in tropical forest . Gut facilitate nutrient cycling by converting nitrogenous waste compounds into , enabling utilization of decaying plant material.

Human Relevance

Widely used as feeder insects for captive including tarantulas, bearded dragons, and other lizards. Used in research on locomotion, sensory processing, and robotics (kinematics design of -inspired robots). Subject of nanoparticle interaction studies due to accessible . Involved in a fatal choking incident during an insect-eating competition in Florida in 2012.

Similar Taxa

Blaberus craniiferTrue death's ; distinguished by more defined skull-like pronotal marking
Blaberus giganteusCentral American giant cave ; larger (to 75+ mm) with different pronotal pattern
Periplaneta americanaAmerican cockroach; faster runner (~50 body lengths/second), can climb smooth surfaces, different pronotal pattern