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We report the discovery of significant localized structures in the projectedtwo-dimensional (2D) spatial distributions of the Globular Cluster (GC) systemsof the ten brightest galaxies in the Virgo Cluster. We use catalogs of GCsextracted from the HST ACS Virgo Cluster Survey (ACSVCS) imaging data,complemented, when available, by additional archival ACS data. These structureshave projected sizes ranging from $\sim\!5$ arcsec to few arc-minutes($\sim\!1$ to $\sim\!25$ kpc). Their morphologies range from localized,circular, to coherent, complex shapes resembling arcs and streams. The largeststructures are preferentially aligned with the major axis of the host galaxy. Afew relatively smaller structures follow the minor axis. Differences in theshape and significance of the GC structures can be noticed by investigating thespatial distribution of GCs grouped by color and luminosity. The largestcoherent GC structures are located in low-density regions within the Virgocluster. This trend is more evident in the red GC population, believed to formin mergers involving late-type galaxies. We suggest that GC over-densities maybe driven by either accretion of satellite galaxies, major dissipationlessmergers or wet dissipation mergers. We discuss caveats to these scenarios, andestimate the masses of the potential progenitors galaxies. These masses rangein the interval $10^{8.5}\!-\!10^{9.5}$ solar masses, larger than those of theLocal Group dwarf galaxies.

Spatial Structures In the Globular Cluster Distribution of the Ten Brightest Virgo Galaxies