In a city synonymous with glitz and glamour, the Los Angeles thread millipede has managed to elude the spotlight, opting instead for an existence in the depths of obscurity. Amidst the entertainment capital of the world, this newfound species, known as Illacme socal, has remained hidden, living its life beneath the soil’s surface, far from the dazzle of Hollywood. However, when scientists chanced upon this elusive creature, they recognized its significance and granted it a well-deserved moment on the center stage of scientific discovery.
From the Shadows: Introducing Illacme socal
Illacme socal emerges as a diminutive and pale inhabitant of subterranean landscapes, dwelling at depths exceeding 10 centimeters beneath the soil. Unveiled in a report published in ZooKeys on June 21, this species stands as the third known member of a genus that epitomizes seclusion and an underground lifestyle. A distinctive feature of these millipedes, I. socal in particular, is their uncanny resemblance to threads pulled from fabric. Dr. Paul Marek, a millipede biologist at Virginia Tech, aptly characterizes their appearance, underscoring their unique identity.
An Unforeseen Discovery: The Journey to Unveiling
The story of Illacme socal’s revelation unfolds with two naturalists, Cedric Lee and James Bailey of the University of California, Berkeley, embarking on a quest to find gelatinous gastropods. Their expedition in Lake Forest, California, in 2018, however, led them to an unexpected encounter with a millipede that defied categorization. Sharing their finding on iNaturalist, an app designed for the documentation and sharing of biological discoveries, they identified the specimen as a member of the Siphonophoridae family, sparking curiosity across the scientific community.
Marek, who is well-versed in utilizing iNaturalist, was alerted to this remarkable discovery. Intrigued by the millipede’s presence in Lake Forest, which stood apart from its known habitat hundreds of kilometers north, Marek collaborated with Lee and Bailey to demystify this enigmatic creature.

Decoding the Mystery: Unraveling the Genetics
A comprehensive investigation ensued, culminating in a visit to Lake Forest by Marek during the Christmas season. The aim was to locate more individuals of the species to facilitate a thorough understanding of their variations. Marek’s scrutiny of the males’ gonopods, evolutionary remnants of leg segments that now serve as sperm transfer organs, yielded distinct characteristics. Employing genome sequencing to validate their findings, the team unveiled the Los Angeles thread millipede as a hitherto undiscovered species within the Illacme genus. The name “Illacme socal” was bestowed upon the millipede, with an additional moniker, “Los Angeles thread millipede,” embracing its recognizable association with the city. Marek emphasizes the practicality of common names in fostering awareness for conservation efforts.
A Subterranean Lifestyle: Illacme’s Unique Niche
Derek Hennen, a myriapod biologist at the Virginia Museum of Natural History, aptly characterizes the Illacme genus’s lifestyle as “almost completely subterranean.” While numerous millipede species inhabit shallow terrains, Illacme species have a penchant for delving deep into the soil, evading casual observation. The isolation of Illacme’s closest relatives in distant regions such as South Africa or Chile contributes to the mystique surrounding these creatures. Illacme socal’s discovery serves as a testament to the hidden treasures of biodiversity lurking beneath our feet, unveiling a thriving world beneath the surface.
Conclusion: Unearthing Hidden Diversity
The revelation of Illacme socal, the Los Angeles thread millipede, transcends a mere scientific finding. It serves as a poignant reminder of the vast realms of undiscovered diversity beneath the Earth’s crust. The unassuming millipede, residing in a metropolis renowned for its glitzy veneer, brings attention to the richness of life hidden from plain view. As we celebrate this discovery, we are beckoned to reflect upon the untouched landscapes awaiting exploration and the imperative to preserve and cherish the myriad species that form the tapestry of our planet’s biodiversity. Illacme socal’s journey from obscurity to recognition exemplifies the enduring spirit of discovery that fuels scientific inquiry and our collective responsibility to safeguard the wonders of the natural world.