Identification
*Abylopsis eschscholtzii* is a master of geometric transparency. To the naked eye, this siphonophore looks like a delicate, crystalline prism drifting in the water column. It is characterized by two distinct swimming bells (nectophores). The anterior nectophore is roughly cuboid but defined by five sharp, longitudinal ridges—a key field mark that distinguishes it from its close relative, *A. tetragona*, which possesses only four. These bells are remarkably small, typically under 2 cm in length, and are as clear as glass, making them nearly invisible against the sunlit open ocean.
Habitat & Range
This is a true citizen of the "blue desert." It thrives in the epipelagic zone (the sunlit surface layer) of tropical and subtropical oceans globally. You won't find it clinging to reefs or near the shore; it prefers the deep, oceanic waters of the Atlantic, Pacific, and Indian Oceans, typically staying within the top 200 meters where the water remains warm and plankton is abundant.
Behaviour
Watching an *Abylopsis* is like observing a tiny, pulsing glass engine. It moves via jet propulsion, using rhythmic contractions of its nectophores to navigate. It is not a single animal, but a colonial one; trailing behind the bells is a "siphosome"—a chain of specialized individuals (zooids) responsible for feeding and reproduction. In the field, you’ll see them hanging vertically, drifting with the currents like a microscopic fishing lure.
Diet
Despite its fragile appearance, it is a formidable predator. It deploys a "fishing line" of stinging tentacles to snare copepods and other small crustaceans. Once paralyzed by potent stinging cells (nematocysts), the prey is hauled up to the feeding polyps (gastrozooids) to be digested and shared with the entire colony.
Fascinating Fact
This creature has a "secret identity." During its life cycle, it releases independent units called *eudoxids*. These break away from the main colony to live, feed, and reproduce on their own. They look so vastly different from the parent colony that early 19th-century naturalists originally classified them as an entirely separate species!