Mud Mimic Assassin Bug

Have it not moved, i wouldn't spotted it even if its right in front of me. Taken at night in Singapore.

Quote from en.wikipedia.org/wiki/Reduviid…
The Reduviidae are a large cosmopolitan family of the order of "true bugs" or Hemiptera. They are slightly unusual among the Hemiptera because almost all are terrestrial ambush predators (most other predatory Hemiptera are aquatic). The main examples of non-predatory Reduviidae are some blood-sucking ectoparasites in the subfamily Triatominae. Though there are spectacular exceptions, most members of the family are fairly easily recognisable: they have a relatively narrow neck, sturdy build and formidable curved proboscis (sometimes called a rostrum). Large specimens should be handled with caution, if at all, because they sometimes defend themselves with a very painful stab from the proboscis.

The Reduviidae are members of the suborder Heteroptera of the order Hemiptera. The family are almost all predatory, except for a minority that are blood-sucking species of importance as disease vectors. About 7000 species have been described, making it one of the largest families in the Hemiptera.

The name Reduviidae is derived from the type genus, Reduvius. That name in turn comes from the Latin reduvia, meaning "hangnail" or "remnant". Possibly this name was inspired by the lateral flanges on the abdomen of many species.

Adult insects range from about 4 to 40 mm, depending on the species. They most commonly have an elongated head with a distinct narrowed neck, long legs, and prominent, segmented, tubular mouthparts, most commonly called the proboscis, but some authors use the term "rostrum". Most species are bright in color with hues of brown, black, red, or orange.

The most distinctive feature of the family is that the tip of the rostrum fits into a groove in the prosternum, where it may be used for stridulation by rasping it against ridges in the groove. The structure of ridges is a stridulitrum, or stridulatory organ to produce sound, a tactic often used to discourage predators. If harassment continues, many species can deliver a painful stab with the proboscis, injecting venom or digestive juices. The effects can be intensely painful and the injection from some species may be medically significant.