Praya dubia

Praya dubia is a deep-sea siphonophore: a colonial hydrozoan whose specialized zooids form an elongated, free-floating colony that can reach exceptional lengths.

Siphonophorae: Siphonophorae are colonial hydrozoans whose connected zooids cooperate as a single free-floating organism. Praya dubia belongs to this order of integrated hydrozoan colonies.
Nectophore: A nectophore is a swimming zooid in a siphonophore, typically shaped to propel the colony through water. Nectophores provide the colony’s propulsion without requiring every zooid to swim.
Deep-sea exploration: Deep-sea exploration uses instruments and vehicles to observe and study environments beyond the reach of ordinary diving. Remote cameras and submersibles make observations of Praya dubia possible in its habitat.
Praya dubia specimen at the Monterey Bay Aquarium Research Institute: A remotely filmed Praya dubia colony documented by MBARI during deep-sea exploration off California. This observation shows the species in its natural environment rather than as a damaged specimen.
Hydrozoa: Hydrozoa are a class of cnidarians that includes hydroids, fire corals, and siphonophores. This class provides the broader cnidarian lineage to which Praya dubia belongs.
Pneumatophore: A pneumatophore is a gas-filled float found in some siphonophores, helping support them in the water column. A float can provide buoyancy in siphonophore colonies, though its presence varies among groups.
Remotely operated underwater vehicle: A remotely operated underwater vehicle is an uncrewed submersible controlled from a surface vessel through a tether. ROVs can film delicate siphonophores without collecting or damaging them.
Siphonophore ring: A roughly circular arrangement of siphonophore zooids observed in deep water and interpreted as a possible feeding formation. This unusual formation illustrates the distinctive spatial patterns of colonial siphonophores.
Zooid: A zooid is an individual animal unit in a colonial organism, often specialized for a particular function. Its colony consists of zooids that divide feeding, locomotion, and reproduction.
Gastrozooid: A gastrozooid is a feeding zooid that captures and digests prey in a colonial cnidarian. Feeding zooids supply nutrients to the integrated colony.

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SiphonophoreBroader topic: This species illustrates how a colony can extend into a long, coordinated hunting structure.