Athecate Hydroid Collection

Blue dragon seaslug (Glaucus atlanticus) with Blue button hydroid colony (Porpita porpita) on which it feeds. Tenerife, Canary Islands. October

Green hydra (Hydra viridissima) found in a garden pond. Derbyshire, UK. September. Winner of the Hidden Britain Category of the British Wildlife Photographer of the Year Awards (BWPA) Competition 2017

RF - A vibrant Red Sea coral reef scene, with orange female Scalefin anthias fish (Pseudanthias squamipinnis) teeming over Fire coral (Millepora dichotoma)

School of Scalefin anthias (Pseudanthias squamipinnis) females, swimming around Fire coral (Millepora dichotoma) feeding on plankton brought to the reef by currents, Ras Mohammed National Park

Male Emperor angelfish (Pomacanthus imperator) swimming over garden of Fire corals (Millepora sp)
Male Emperor angelfish (Pomacanthus imperator) swimming over garden of Fire corals (Millepora sp.) in morning sunshine, Ras Mohammed National Park, Sinai, Egypt, Red Sea

Emperor angelfish (Pomacanthus imperator) swimming in front of Fire corals (Millepora dichotoma) and soft corals (Dendronephthya sp.) and (Scleronephthya sp)

Blade fire coral (Millepora complanata) colonies breaking wave, protection against hurricanes. Guanaja Island, Honduras. Caribbean Sea

Juvenile Damselfish (Stegastes) hiding amongst Blade fire coral (Millepora complanata). Roatan Island, Honduras. Caribbean Sea

Common hermit crab (Pagurus bernhardus) with Snail fur (Hydractinia echinata) growing on its shell, close up, Ronas Voe, Shetland, Scotland, North Atlantic Ocean, UK

Freshwater green hydra (Hydra viridissima) moving over a petri dish. Green colour comes from the symbiotic relationship with green alga Chlorella vulgaris

Diverse hard coral growth (Pocillopora damicornis, Pocillopora verrucosa and Millepora dichotoma), flourishes beneath the barren desert cliffs in the Red Sea. Ras Katy, Sinai, Egypt

RF - Split level photo of a coral reef with hard corals (Acropora sp. Millepora sp. and Pocillopora sp.) and the shore with palm trees, at sunset. Red Sea

Anthias fish (Pseudanthias squamipinnis), by Fire coral (Millepora dichotoma) and soft coral, on coral reef, Shark Reef to Jolande Reef, Ras Mohammed National Park, Egypt, Red Sea

Vibrant Red Sea reef scene, with orange female Scalefin anthias (Pseudanthias squamipinnis) swarming in front of Fire coral (Millepora dichotoma) feeding on plankton brought to the reef by currents

Millepora
Branching colony, 11 cm in height, of the hydrozoan Millepora from the Pleistocene of Aldabra in the Indian Ocean

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The world beneath the waves is a mesmerizing realm, filled with an array of fascinating creatures and vibrant ecosystems. One such creature that captivates both scientists and nature enthusiasts alike is the athecate hydroid. In the vast expanse of the ocean, where shades of blue dominate, a delicate dance unfolds between two enchanting organisms. The Blue dragon seaslug gracefully glides through the water, its iridescent hues reflecting sunlight like a shimmering gem. As it navigates this liquid world, it encounters a Blue button hydroid colony known as Porpita porpita. This stunning collaboration creates an ethereal scene that seems straight out of a dream. On land, in unexpected places like garden ponds in Derbyshire, UK, another species called Green hydra thrives. These tiny creatures possess an otherworldly beauty as they sway gently in their aquatic abode during September's golden days. Venturing into warmer waters brings us to Ras Mohammed National Park in Sinai, Egypt. Here lies a Red Sea coral reef teeming with life and color. A school of Scalefin anthias females elegantly swim around Fire coral colonies while feasting on plankton brought by ocean currents. The sight is nothing short of breathtaking. Emperor angelfish are majestic rulers of these underwater kingdoms and can be found swimming over gardens of Fire corals bathed in morning sunshine at Ras Mohammed National Park. Their vibrant presence adds splashes of vivid colors against the backdrop of soft corals and Scalefin anthias fish. Traveling further west to Guanaja Island in Honduras reveals Blade fire coral colonies standing tall against crashing waves—a testament to their resilience against hurricanes that threaten their existence. Even within shallower waters near Roatan Island off Honduras' coast resides juvenile Damselfish seeking refuge amongst Blade fire coral for protection from predators lurking nearby—nature's own game hide-and-seek played out beneath turquoise tides. Not all hydroids reside in the ocean.