Roving beetles are primarily distinguished by their short elytra (wing covers) that typically leave more than half of their abdominal segments exposed. There are roughly 63,000 species in thousands of genera, the group is currently recognized as the largest extant family of organisms.
Their diets include everything; however, most rove beetles tend to be predators of insects and other invertebrates, living in forest leaf litter, decaying plant matter, under stones, and around freshwater margins. Almost 400 species are known to live on ocean shores that are submerged at high tide.
Another advantage of rove beetles is their sensitivity to changes in the environment, and hence are useful ecological indicators to habitat disturbance by humans.
Source: Wikipedia
Subfamily Scaphidiinae

(Johore, Malaysia)

(Singapore)

(Singapore)