Solenostomus cyanopterus can reach a length of 17 centimetres (6.7 in) and it is the largest of the ghost pipefishes. The body may be grey, brown, pink, yellow or bright green, with small black and white dots. This cryptic species looks very similar to a drifting piece of seagrass. Caudal fin may be truncate, rounded, or lanceolate. Caudal peduncle is quite short or absent. Pelvic fin is sexually dimorphic. It is an uncommon species related to pipefishes and seahorses. It can be distinguished by the presence of the pelvic fins, the prominent spiny dorsal fin, and 27-35 star-shaped plates on the skin.
These fishes float near motionlessly, with the mouth facing downwards, around a background that makes them nearly impossible to see. They feed on tiny crustaceans, sucked inside through their long snout. They live in open waters except during breeding, when they find a coral reef or muddy bottom, changing color and shape to minimize visibility. Unlike true pipefish, female ghostpipefishes use their enlarged pelvic fins to brood their eggs until they hatch.
Robust ghost pipefish is mostly pelagic and reef-associated. When it settles on the substrate for breeding, it can be found on coastal reefs and weedy areas, at a depth of 2–25 metres (6 ft 7 in–82 ft 0.3 in).
- Australian Museum
- Tim Flannery and Peter Schouten. Amazing Animals: Extraordinary Creatures and the Fantastic Worlds They Inhabit. New York: Atlantic Monthly Press, 2004. Page 116-117.
- Orr, JW and Fritzsche, RA. 1993. Revision of the Ghost Pipefishes, Family Solenostomidae (Teleostei: Syngnathoidei). Copeia 1993:168-182.