Origin And Natural Habitat
The Pacific coast of Mexico — specifically the state of Colima and the mountains near Manzanillo — is where Bonnetina cyaneifemur was first collected and formally described, making it a species of the tropical dry forest and highland terrain of Mexico’s southwestern Pacific slope. Fabian Vol collected the type specimens in the mountains near Manzanillo in Colima during a summer field trip to the Pacific coast, discovering the blue femur colouration that immediately flagged the specimens as something distinct from the Brachypelma and Aphonopelma species he had expected to find. The Colima and Manzanillo region is characterised by tropical dry forest on the lower slopes, transitioning into more humid highland forest at elevation — a seasonally variable climate with a pronounced wet season from June through October and a long dry season for the remainder of the year.
The spider constructs its burrow under the topsoil or amongst branches, rocks, and other forest floor debris — a terrestrial burrowing lifestyle consistent with the broader Bonnetina genus character and with the Pacific coastal Mexican tarantula fauna more broadly. The habitat context of tropical dry forest and mountain terrain on Mexico’s Pacific slope — similar in many respects to the habitats of Pacific coast Brachypelma species — gives a practical framework for the care requirements and explains why experienced keepers consistently treat this species as a dry to semi-arid Mexican terrestrial in terms of husbandry.
Scientific Classification
Described by Fabian Vol in 2000 in the journal Arachnides, B. cyaneifemur is the type species of the genus Bonnetina — meaning the entire genus was established around this species when Vol recognised that the blue femur specimens belonged to a new taxon distinct from all previously described Mexican theraphosids. The genus name honours French arachnologist Pierre Bonnet and the species name cyaneifemur combines the Latin cyaneus (dark blue, from the Greek kyanos) with femur (thigh) — directly referencing the dark cyan-blue femurs that make the species instantly recognisable. Bonnetina currently contains sixteen species, all from Mexico, making it an entirely Mexican-endemic genus. The World Spider Catalog and iNaturalist confirm B. cyaneifemur Vol, 2000 as the current valid name. Full classification: Kingdom Animalia, Phylum Arthropoda, Class Arachnida, Order Araneae, Infraorder Mygalomorphae, Family Theraphosidae, Subfamily Theraphosinae, Genus Bonnetina, Species B. cyaneifemur Vol, 2000.
Species Overview
Bonnetina cyaneifemur is one of those species that sits in a curious hobby position — absolutely gorgeous according to every keeper who has worked with it, genuinely rare in captive collections, and belonging to a genus that most tarantula keepers outside specialist circles have never encountered. The genus Bonnetina has received very little hobby attention compared to Brachypelma and Aphonopelma despite sharing the same Mexican Pacific coastal habitat as some of the most famous species in the hobby. The care is entirely parallel to Mexican Brachypelma keeping — dry substrate with a water dish, the overflow method for moisture management, and the standard arid Pacific coast Mexican terrestrial framework — making it approachable for any keeper already comfortable with Mexican species. Beginner to intermediate experience is appropriate, with the caveat that the species is very skittish and fast in a way that makes casual handling genuinely impractical.
Appearance And Size
The blue femurs are the defining feature and the entire reason for the species name, the common name, and the collector interest. The femur — the first major leg segment nearest the body — carries a brilliant dark cyan-blue colouration that stands out against the darker remainder of the leg in a contrast that is immediately eye-catching. The overall body is dark — dark chocolate brown to near-black across the carapace, abdomen, and the remaining leg segments — which makes the blue femurs even more visually dramatic by contrast rather than blending into a generally colourful palette. The colour combination of dark body and cyan-blue femurs is compact and precise rather than broadly colourful — a species whose visual impact comes from a single striking element rather than overall palette complexity, which gives it an almost jewel-like quality.
Adult females top out at approximately 4 inches in legspan — a small to medium sized tarantula in the context of Mexican species — with males maturing in approximately three years. The species has a medium growth rate and is described as having good appetite without the tendency to fast that characterises some Brachypelma species.
Housing
A terrestrial enclosure with floor space as the priority and adequate substrate depth for burrowing. For a spider reaching 4 inches adult legspan, a footprint of 15 by 15 to 20 by 20 centimetres suits adult females, with 4 to 5 inches of substrate and height kept to twice the legspan maximum. A latching lid is essential given the documented skittishness and speed of this species — a fast spider in an unsecured enclosure is a serious escape risk. A pre-formed starter burrow at one end and a cork bark hide give immediate retreat options. Our best tarantula enclosure guide covers terrestrial formats appropriate for small to medium Mexican native burrowing species, and our best tarantula sling enclosure guide covers smaller formats for juveniles.
Enclosure’s Decorations
Cork bark flat at substrate level with a pre-formed burrow beneath provides the primary retreat structure. A shallow water dish at the opposite end ensures hydration access. Flat rocks or additional bark pieces give the enclosure a Pacific coast Mexican dry forest character. Our best tarantula hide guide covers cork shapes appropriate for small Mexican Pacific coast terrestrial species.
Substrate
Four to five inches of dry substrate with good structural integrity for burrowing. The care recommendation from experienced keepers is to treat this exactly as a Mexican Brachypelma — dry substrate at the surface with the overflow method for periodic moisture management. A coconut coir and sand blend gives appropriate drainage and firmness for the burrowing behaviour. The tropical dry forest origin means the species is adapted to a pronounced dry season and occasional heavy rainfall events rather than continuous moisture, and the overflow method — periodically overflowing the water dish to wet one corner of the substrate before allowing it to dry — replicates that seasonal character more faithfully than maintaining consistent substrate moisture. Our best tarantula substrate guide covers dry arid blends appropriate for Pacific coast Mexican terrestrial species.
Water And Humidity
A shallow water dish at all times, refreshed every two to three days. Ambient humidity of 50 to 65 percent is appropriate for the tropical dry forest and mountain terrain of the Colima coast range. The overflow method provides periodic moisture pulses to the substrate without maintaining chronic dampness. A hygrometer confirms actual conditions, particularly useful in environments where other high-humidity species might elevate ambient readings above appropriate levels for this dry-climate Mexican native.
Heating And Temperature
The Pacific coast of Colima maintains warm temperatures year-round, and a captive range of 72 to 82°F suits this species well. Most temperate indoor environments provide appropriate conditions without supplemental heat for most of the year. A side-mounted heat mat controlled by a thermostat handles periods when ambient temperatures drop consistently below 68°F. A thermometer at substrate level confirms actual enclosure conditions.
Diet And Nutrition
Crickets, dubia roaches, and other appropriately sized invertebrates every ten to fourteen days for adults. The species has a good appetite and does not tend to fast in the way that Brachypelma keepers sometimes experience with their species — a keeper-friendly quality that makes feeding schedule management more predictable. Juveniles every seven to ten days. Remove uneaten prey within 24 hours and leave the spider completely undisturbed when it seals its burrow before a moult. Our best tarantula food guide covers feeder options and sizing for small to medium-sized Mexican dry forest terrestrial species.
Compatibility
Solitary only. For breeding, the dry season to wet season transition of the Pacific coast Colima region — broadly late May through early July — would logically provide the natural timing trigger for introduction attempts, consistent with the seasonal breeding patterns of Pacific coast Mexican theraphosids broadly.
Behavior And Temperament
Very skittish and fast but not defensive is the most accurate keeper characterisation — a species that bolts readily at disturbance but does not adopt threat postures or kick urticating hairs aggressively in response. The skittishness makes enclosure maintenance requiring deliberate, slow movements and an awareness of where the spider is positioned before any lid is opened. Urticating hairs are present as the standard New World defensive tool but the species’ tendency is to run rather than stand and defend. The blue femurs are most visible during feeding interactions and during the periods when the spider sits at the burrow entrance — moments that reward patient observation rather than frequent disturbance.
Handling
Not recommended given the extreme skittishness and speed documented by keepers who have worked with this species. The combination of small adult size and high movement speed makes controlling a startled specimen genuinely challenging, and the risk of the spider bolting from a handling height and falling to a hard surface is significant. This species is best enjoyed through the enclosure glass. Venom is medically insignificant to healthy humans as a New World species.
Health And Lifespan
Precise female lifespan data is not well-established from captive records given the species’ rarity in collections, but based on the adult size and the medium growth rate documented by keeper experience, females likely live 10 to 15 or more years. The species is described as hardy within appropriate dry Mexican Pacific coast conditions. Primary health risks are excess moisture without adequate drainage for a dry-climate species and the chronic dryness without water dish access that risks dehydration in any long-lived terrestrial. Our tarantula dehydration article covers identification and recovery for dehydration concerns in small Mexican terrestrial species.
Price
Rare in the hobby with limited captive breeding making finding specimens a genuine challenge. When available, slings typically sell for $50 to $100 USD reflecting the rarity and collector premium on a visually distinctive Mexican species that most keepers have never encountered. Juveniles range from $80 to $150. Confirmed adult females, being essentially unavailable through normal channels, command $150 or more when they appear. Source captive-bred specimens only — Mexico has wildlife protection legislation governing its native theraphosid fauna, and responsible captive sourcing is both legally and ecologically the correct approach. Everything needed to provide appropriate Pacific coast Mexican conditions for this cyan-femured jewel is on our best tarantula products page.