Hymenocera picta | |
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Harlequin shrimp hunting a Fromia milleporella | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | Malacostraca |
Order: | Decapoda |
Suborder: | Pleocyemata |
Infraorder: | Caridea |
Family: | Palaemonidae |
Genus: | Hymenocera Latreille, 1819 |
Species: | H. picta |
Binomial name | |
Hymenocera picta Dana, 1852 | |
Synonyms | |
Hymenocera elegansHeller, 1861 |
Hymenocera picta, commonly known as the harlequin shrimp, is a species of saltwater shrimp found at coral reefs in the tropical Indian and Pacific Oceans. It is usually considered the only species in the genus Hymenocera, [1] [2] but some split it into two species: H. picta from the central and east Pacific, where the spots are deep pinkish-purple with a yellow edge, and H. elegans from the Indian Ocean and west Pacific, where the spots are more brownish and have a blue edge. [3] They reach about 5 cm (2.0 in) in length, live in pairs, and feed exclusively on starfish, [3] including crown-of-thorns starfish. They do seem to prefer smaller, more sedentary starfish, but as these generally are not sufficiently numerous for their needs, they commonly attack crown-of-thorns starfish, both reducing its consumption of coral while under attack, and killing it within a few days. [4]
The harlequin shrimp is usually cream colored or white with occasional spots. Around the Pacific Ocean, many of these shrimp have red spots, while the Indian Ocean shrimp typically have purple spots; the Hawaiian H. picta has purple and red spots on its body, the shrimp has two walking legs on each side and large claws, or chelipoda. The claws and eyes appear to look flattened and thin. On its head, the shrimp has "petal-like sensory antennules" to smell out prey. Its body usually reaches up to 5 cm (2 in), and the male is slightly smaller than the female. [5]
These shrimp are typically found in Hawaii through the Indo-Pacific below the intertidal zone on coral reefs. [5] They prefer temperatures of 72–82°F, but are very rare because of the changing coral reefs.
Harlequin shrimp usually only feed on starfish. They are very skilled at flipping over a slow starfish on its back, and eating the tube feet and soft tissues until it reaches the central disk. They, usually one female and one male, use their claws to pierce the tough skin and feeding legs to help them maneuver the starfish. Sometimes, the starfish will shed the arm that the shrimp attacked and regrow it, but it is usually too wounded to regrow. They may also feed on sea urchins, because they have tube feet, as well, but that is rare and only if starfish are not available. [6]
The harlequin shrimp moves at a very slow pace and in waves. It also may have toxins from its prey (the starfish), which could make it distasteful and potentially dangerous for predators. The shrimp also moves its claws almost constantly. Females are larger and have colored abdominal plates unlike the males. The female produces between 100 and 5,000 eggs per season depending on environmental factors. The male and female are often seen together in the wild, and work together to not only reproduce, but also to forage. [7]
The crown-of-thorns starfish, Acanthaster planci, is a large starfish that preys upon hard, or stony, coral polyps (Scleractinia). The crown-of-thorns starfish receives its name from venomous thorn-like spines that cover its upper surface, resembling the biblical crown of thorns. It is one of the largest starfish in the world.
The bicolor angelfish is a marine species of fish, easily recognizable by its yellow tail, yellow front half of their body, and blue rear with blue patterns above and around the eye. Other names of this angelfish include: Pacific rock beauty, oriole angelfish, oriole dwarf angel, blue and gold angel, and two-colored angel. The life expectancy of this fish in the wild varies greatly, depending on location, and ranges between 5 and 13 years. These fish tend to grow to a maximum of 6 inches in length. The larval stages lasts approximately 32 days.
Linckia laevigata is a species of sea star in the shallow waters of tropical Indo-Pacific.
Hālona Blowhole is a rock formation and a blowhole on the island of Oahu, Hawaii off of Hanauma Bay at Hālona Point overlooking the Pacific Ocean. In Hawaiian hālona means "lookout".
The snowflake moray, also known as the clouded moray among many vernacular names, is a species of marine eel of the family Muraenidae. It has blunt teeth ideal for its diet of crustaceans, a trait it shares with the zebra moray.
The flame angelfish is a marine angelfish of the family Pomacanthidae found in tropical waters of the Pacific Ocean. Other common names include flame angel, flaming angelfish and Japanese pygmy angelfish.
Nemateleotris magnifica, known by a variety of common names including fire goby, magnificent fire fish, fire dartfish, or red fire goby, is a species of dartfish native to coral reefs of the Indian and Pacific oceans.
Sufflamen bursa, sometimes known as Lei Triggerfish, bursa triggerfish, scythe triggerfish or boomerang triggerfish, is a triggerfish from the Indo-Pacific. Its name is derived from the two markings behind its eyes that wrap around the fish similar to a Hawaiian Lei. The color of these markings changes depending on the fish's mood, in which case the colors may alter from yellow, dark brown, and black. It is a species of reef fish found in reef ecosystems in the Indo-Pacific, including Japan, Australia, and Hawaii. It occasionally makes its way into the aquarium trade.
Cassis cornuta, common name the horned helmet, is a species of extremely large sea snail, a marine gastropod mollusc in the family Cassidae, the helmet shells and their allies.
Gonodactylus smithii, also known as the purple spot mantis shrimp or Smith's mantis shrimp, is a species of the smasher type of mantis shrimp. G. smithii are the first animals discovered to be capable of dynamic polarization vision. They are identified by their distinctive meral spots ranging from maroon to purple with a white ring, though those that inhabit depths below 10 meters tend to be colored maroon. They also have raptorial dactyles, specialized forelimbs that are pigmented green and red, and antennal scales that are yellow.
Linckia multifora is a variously colored starfish in the family Ophidiasteridae that is found in the Indian Ocean and Red Sea. Its common names include the Dalmatian Linckia, mottled Linckia, spotted Linckia, multicolor sea star and multi-pore sea star.
Porites lobata, known by the common name lobe coral, is a species of stony coral in the family Poritidae. It is found growing on coral reefs in tropical parts of the Indian and Pacific Oceans.
Nemateleotris helfrichi, Helfrich's Dartfish, is a species of dartfish native to the Pacific Ocean.
Due to the warming of the Atlantic Ocean caused by climate change, many species of fish are beginning to shift north towards cooler waters within their temperature range. Tropical species are being found outside their normal range and into more northern waters causing an array of ecological, economic, and fishery management problems.
Pocillopora verrucosa, commonly known as cauliflower coral, rasp coral, or knob-horned coral, is a species of stony coral in the family Pocilloporidae. It is native to tropical and subtropical parts of the Indian and Pacific Oceans.
Acropora nasuta is a species of branching stony coral in the family Acroporidae. It is native to the western and central Indo-Pacific where it is found in shallow reef habitats. Like other corals of the genus Acropora, it is susceptible to coral bleaching and coral diseases and the IUCN has listed it as being "Near Threatened".
Novodinia antillensis, the velcro sea star, is a species of starfish in the family Brisingidae. It is found in the deep sea in the tropical and subtropical western Atlantic Ocean, being quite common at a depth of around 500 m (1,640 ft) on the Mesoamerican Reef off Roatán, Honduras.
Echinaster callosus, the warty sea star or the banded bubble star, is a species of starfish found in shallow parts of the western Indo-Pacific region. The disc and five slender arms are covered with white, pink, red or violet warts, often forming transverse bands of colour on the arms.
Cephalopholis sonnerati, known as the tomato hind, tomato rockcod, or tomato cod, is a species of marine ray-finned fish, a grouper from the subfamily Epinephelinae which is in the family Serranidae which also includes the anthias and sea basses. It is distributed on coral reefs in the tropical Indo-Pacific. It is also sometimes called the orange-spotted cod, red coral cod, red rockcod, tomato grouper, or tomato seabass.
Zenopontonia soror, the starfish shrimp or seastar shrimp, is a species of shrimp in the family Palaemonidae. It is found in shallow water in the tropical Indo-Pacific region. It lives in association with a starfish, often changing its colour to match that of its host.