Tripneustes gratilla, commonly known as the collector urchin or Halloween urchin, is a species of sea urchin. It's a herbivorous echinoderm found in various tropical habitats like coral reefs, seagrass meadows, and algal forests. These urchins have a dark, often bluish-purple test (shell) with white or orange spines, sometimes completely white or orange-tipped.
Key Features and Behaviors:
Color: While typically dark, their spines can vary from white to orange, with some having orange tips or being entirely white.
Test: The test is usually dark, especially in interradial regions, which are the areas between the spines.
Spines: They possess long, obvious spines, and their spines are often inclined towards adjacent ambulacra, giving the appearance of a pentaradiate cross.
Podia: These urchins have long and obvious tube feet (podia) that help them move and collect debris.
Diet: Tripneustes gratilla is herbivorous, feeding primarily on algae.
Habitat: They are found in a variety of tropical habitats, including coral reefs, seagrass meadows, and algal forests.
Covering Behavior: They are known for their "covering behavior," using tube feet to cover their aboral (top) surface with debris like rocks and other materials.
Predators: Common predators include pufferfishes, octopuses, and humans.
Venom: They possess venom but it doesn't typically cause severe stings.
Edibility: While they are not the most commonly consumed sea urchin, some cultures do eat their gonads.
Other names: They are also known as cake, Parson's hat, Halloween, Hawaiian, priest-hut, pincushion, and hairy sea urchins
Diadema setosum, commonly called the diadem urchin or long-spined sea urchin, is a species of long-spined sea urchin known for its distinct five white dots and extremely long, hollow, mildly venomous spines. It's a typical sea urchin, with a round, hard shell (test) and numerous spines. Diadema setosum is primarily found in the Indo-Pacific region, including areas from Australia and Africa to Japan and the Red Sea.
Key Features:
Spines: Long, hollow, and sharp spines that can cause painful stings, though only slightly venomous.
Test: A round, hard shell made of fused plates.
Color: Black or dark brown, with five distinctive white spots on its body.
Habitat: Shallow tropical reefs in the Indo-Pacific, from Australia to Japan and the Red Sea.
Behavior: Primarily a grazer, active at night, and vulnerable to predation from fish.
Size: Maximum test diameter of 90 mm.
Symbiotic relationships: Can host the urchin shrimp Stegopontonia commensalis.
Diet: Algae.
Distinguishing Features:
Diadema setosum can be distinguished from its sister species, D. savignyi, by the presence of white spots on its test, while D. savignyi has blue markings.
Archaster typicus, commonly known as the sand sifting starfish or common sea star, is a marine invertebrate with a flat, gray or brownish body. They have five long, slightly tapering arms, though variations with three, four, or even six arms can occur. These starfish are adapted to life on sandy seabeds, where they bury themselves during high tide and move on the surface during low tide.
Key Characteristics:
Shape and Size: Five-limbed star with long, slightly tapering arms. Adults reach 12-15 cm in diameter.
Coloration: Grey or brownish, often with darker and lighter patches, sometimes forming a chevron pattern. Underside is pale.
Habitat: Sandy seabed, where they burrow and move over the surface.
Feeding: They are detritivores, feeding on organic matter in the sand.
Behavior: Active in the top layers of the sand, stirring it to prevent sediment buildup and promote oxygenation.
In Marine Aquariums:
Beneficial: They are popular in reef aquariums for cleaning and aerating the sand bed.
Peaceful and Reef-Safe: They are peaceful and won't harm fish, corals, or other invertebrates.
Maintenance: Require a thick sandy bottom and proper water conditions (temperature, pH).
Deep Cleaning: They stir the top layers of sand (up to 3 cm deep) but don't clean deeply below that.
Conomurex luhuanus, commonly known as the Strawberry Conch or Tiger Conch, is a medium-sized sea snail. It's a marine gastropod mollusk belonging to the family Strombidae, which includes true conchs. These snails are known for their vibrant shell interiors, typically colored orange, red, or pink, with a black or chocolate-brown inner lip border.
Here's a more detailed description:
Appearance:
The shell exterior can have a mottled, striped, or banded pattern, often with pink and white colors reminiscent of strawberries. The interior of the shell is the most striking feature, showcasing bright shades of orange, red, or pink.
Size:
Conomurex luhuanus can grow up to 8 cm (approximately 3 inches) in length.
Diet:
These snails are herbivores, feeding on algae, detritus, and organic matter. They also consume bristleworms and cyanobacteria.
Habitat:
They are found in the Indo-Pacific region, inhabiting sandy bottoms of coral reefs, seagrass beds, and coral rubble. They can also be found in coastal lagoons and other protected areas with clear bottom.
Behavior:
Conomurex luhuanus are known for their high visual acuity, with some studies suggesting they can resolve objects with high spatial resolution.
Ecological Role:
They play a vital role in marine ecosystems by consuming algae, detritus, and other organic matter, contributing to the overall health of the environment.
Social Behavior:
They can be found in colonies, both with juvenile and mixed age-class individuals.
Rochia nilotica, commonly called the commercial top shell, is a marine gastropod mollusk. It's a sizable, heavy, and conical sea snail, with a shell length ranging from 50mm to 165mm and a diameter of 100mm to 120mm . The shell is thick, has an off-white color with irregular axial reddish stripes, and is found in marine environments like tropical reefs.
Here's a more detailed description:
Shape: The shell is conical and subperforate, meaning it has a circular opening at the apex.
Size: It can reach lengths of 50mm to 165mm and diameters of 100mm to 120mm.
Color: The shell is off-white with large, irregular reddish stripes.
Surface: The body whorl is smooth, with concave sides above a protruding, acutely rounded, and thickened periphery .
Other features: The base of the shell is flat and marked with shallow spiral ridges. The aperture (opening) is square-shaped.
Habitat: It is found in marine environments, particularly tropical reefs.
Rochia nilotica is considered a commercially important species, both as a food source and a source of mother-of-pearl for jewelry and buttons. It is also known as a trochus shell or topshell
Echinaster sepositus, the Mediterranean red sea star, is a species of starfish from the East Atlantic, including the Mediterranean Sea.
Description
Echinaster sepositus has five relatively slender arms around a small central disc. It usually has a diameter of up to 20 cm (8 in), but can exceptionally reach up to 30 cm (12 in).It is a bright orange-red in colour, and has a soapy surface texture unlike superficially similar Henricia starfish (another somewhat similar species from the same region is Ophidiaster ophidianus). The surface is dotted with evenly spaced pits from which the animal can extend its deep red gills (papula).
Distribution
Echinaster sepositus is found in the East Atlantic north of the Equator, including the Mediterranean Sea where it is one of the most common starfish (although virtually absent from some localities). Its northern limit is the English Channel, but only on the French side. It is found at depths of 1 to 250 m (3–820 ft) in a wide range of habitats, including rocky, sandy and muddy bottoms, and sea grass meadows (Posidonia oceanica and Zostera)
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, 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. They reach about 5 cm (2.0 in) in length, live in pairs, and feed exclusively on starfish, 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.
Description
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.
Habitat
These shrimp are typically found in Hawaii through the Indo-Pacific below the intertidal zone on coral reefs. They prefer temperatures of 72–82°F, but are very rare because of the changing coral reefs.
Diet
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.
Behavior/reproduction
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.
Most commonly found is pure blue, dark blue, or light blue, although observers find the aqua, purple, or orange variation throughout the ocean. These sea stars may grow up to 30 cm (11.8 in) in diameter, with rounded tips at each of the arms; some individuals may bear lighter or darker spots along each of their arms. Individual specimens are typically firm in texture, possessing the slightly tubular, elongated arms common to most of other members of the family Ophidiasteridae, and usually possessing short, yellowish tube feet. An inhabitant of coral reefs and sea grass beds, this species is relatively common and is typically found in sparse density throughout its range. Blue stars live subtidally, or sometimes intertidally, on fine (sand) or hard substrata and move relatively slowly (mean locomotion rate of 8.1 cm/min).
The genus Linckia, as is true of other species of starfish, is recognized by scientists as being possessed of remarkable regenerative capabilities, and endowed with powers of defensive autotomy against predators.Although not yet documented, L. laevigata may be able to reproduce asexually. L. laevigata is apparently not an exception to this behavior, as many individuals observed in nature are missing arms or, on occasion, in the comet form.
This sea star is fairly popular with marine aquarium hobbyists, where it requires a proper, slow acclimatization before entering the tank system, and an adequate food source similar to that found in its natural habitat. Generally thought of as a detritivore, many sources maintain that this species will indefinitely graze throughout the aquarium for organic films or sedentary, low-growing organisms such as sponges and algae. In the marine aquarium hobby, they have been seen to consume Asterina Starfish, which are commonly introduced into such aquaria on the ubiquitous "live rock" used in such settings.
Lysmata amboinensis is an omnivorous shrimp species known by several common names including the Pacific cleaner shrimp. It is considered a cleaner shrimp as eating parasites and dead tissue from fish makes up a large part of its diet. The species is a natural part of the coral reef ecosystem and is widespread across the tropics typically living at depths of 5–40 metres (16–131 ft).
Lysmata amboinensis can reach a body length of 5–6 centimetres (2.0–2.4 in) and have long white antennae. Mature shrimp are pale in colour with longitudinal bands on their carapace; one central white band with wider scarlet red bands on either side. The shrimp has a long larval stage and unusual sexual maturation, initially being male but becoming a functional hermaphrodite once mature.
Lysmata amboinensis is popular in home and public aquaria where it is commonly referred to as the skunk cleaner shrimp; this is due to its striking colours, peaceful nature, and useful symbiotic cleaning relationship which can also be witnessed in captivity.
Adult shrimp can reach a body length of 5–6 centimetres (2.0–2.4 in) with two pairs of long white antennae. The body and legs are pale amber in colour with longitudinal bands on the carapace: one central white band is flanked by wider scarlet red bands. There are several symmetrical white spots on the red tail. The most anterior antennae fork into two making the shrimp appear to have three pairs of antennae. As with all decapods there are 10 pairs of walking legs, with the most anterior pair having forceps (pincers). Anterior to the walking legs are a pair of white maxillipeds used for feeding. Underneath the thorax behind the walking legs are paired pleopods (swimmerets) used for swimming and brooding eggs.[Lysmata amboinesis have a pair of stalked eyes though experiments suggest they have coarse vision and are colour blind; this low spatial resolution makes it unlikely they can see the striking patterns of other shrimps or tropical fish.
Distribution and habita
Lysmata amboinensis is native to coral reefs across the tropics including the Red Sea and the Indo-Pacific Ocean. They live on tropical coral reefs between depths of 5–40 metres (16–131 ft) and are typically found in caves or reef ledges.
Life cycle
Lysmata amboinesis lay eggs which the adult shrimp keep attached to their pleopods. The early larvae are called nauplii which hatch into more developed larvae called zoeae and go through a free-floating planktonic stage. During this time they feed on other plankton and moult through 14 identified stages growing to approximately 2 centimetres (0.79 in) in length over 5–6 months. At this point the larvae will settle and metamorphose into a more mature form, though not yet the adult state. This is achieved after several moults which occur every 3–8 weeks.
Each shrimp starts out as a male, but after a few moults will become a hermaphrodite allowing them to function as both male and female in interactions with another shrimp; these shrimp have no pure female form. This form of sexual maturation is scientifically described as 'protandric simultaneous hermaphroditism' and is unique to Lysmata shrimp amongst other decapod crustaceans. In one spawning, adult shrimp will lay between 200–500 eggs which are initially attached to the pleopods and are greenish in colour; the eggs swell and lighten in colour before hatching and a few will turn silver on the day of hatching. The eggs hatch around dusk releasing 3–4 millimetres (0.12–0.16 in) long larvae into the free-floating pelagic zone.
Behaviour
Lysmata amboinesis do not live in large groups, more often in pairs, and while omnivorous it is believed they derive much of their nutrition from cleaning parasites and dead tissue from fish. Their mating behaviour has been observed in captivity where it involves little ritual: a pair of fully mature hermaphroditic shrimp will alternate moulting timing, mating occurs shortly following a moult when one shrimp acting as the male will follow the other acting as the female which will brood the fertilised eggs; when the next shrimp moults the roles, and therefore apparent sex, will reverse.
In captivity L. amboinesis have been seen to be socially monogamous showing such aggression that if they are kept in groups of more than 2 individuals one pair will kill the rest. While they are not generally seen in large groups in the wild it is unknown if they are socially monogamous in their natural environment.
Symbiosis
Lysmata amboinesis, like other cleaner shrimp, has a symbiotic relationship with 'client' fish in which both organisms benefit; the shrimp gain a meal from eating parasites living on large fish and the clients benefit from the removal of parasites. Cleaning organisms including shrimp and fish can congregate in one location on a reef in what is called a "cleaning station" which fish will visit when required; cleaning shrimp perform a rocking dance from side to side to signal their services when fish approach. Removal of parasites under captive conditions happens mainly at night though it is unknown whether this is due to shrimp or host fish behaviour.Additionally, cleaning services provided by the shrimp aid wound healing of injured fish supporting the symbiosis hypothesis. L. amboinesis is also commonly found living in caves with their client fish, such as moray eels, providing the shrimp with protection from predators.
Because of the benefits of cleaner shrimp to the fish they clean, Lysmata amboinensis and other species have been suggested as potentially useful to aquaculture.
Common name
Lysmata amboinesis within the marine aquarium trade is commonly referred to as the skunk cleaner shrimp, white-banded cleaner shrimp or scarlet cleaner shrimp due to its appearance, however this last name is also sometimes used for Lysmata debelius.
In the aquarium
Many species of Lysmata, including L. amboinesis, are commonly kept in salt water aquaria; they are safe and beneficial since they will clean both the tank and fish but not harm corals. For these reasons they are often kept in both home and public aquaria for educational purposes, sometimes in 'touch pools' which allow visitors to put their hand in the water so the shrimp will clean their hand.
Despite significant efforts L. amboinesis remains difficult to culture in captivity, though adults will regularly spawn eggs. The cycle from spawning to adult form takes approximately 6 months during which time the vast majority of larvae die. As such most shrimps sold in the aquarium industry are wild-caught, this has led to concern about the negative effects of their removal on natural reefs though there is currently no evidence of an effect.
Mespilia globulus, commonly known as the Globular Sea Urchin, is a small, spherical sea urchin found in tropical shallow reef habitats. It's characterized by its radially symmetrical, globe-shaped body and relatively small spines, usually brown, red, or dark in color. This sea urchin can grow up to 5 cm in diameter and is known for its algae-eating habits.
Here's a more detailed description:
Size and Shape: The Globular Sea Urchin is small, with a maximum diameter of about 5 cm. Its body is spherical, making it resemble a small, spiny ball.
Spines: It has relatively short spines, which can grow up to 2 cm long. These spines are typically brown, red, or dark in color.
Habitat: Mespilia globulus is found in shallow, tropical reef habitats.
Diet: It is a herbivore, primarily feeding on algae at night.
Behavior: During the day, it often hides on rocks or in crevices, emerging at night to graze on algae. It also exhibits a unique covering behavior, using sponges, shells, and algae.
Appearance: The urchin's radial symmetry and short spines are distinguishing features.
Other Names: It is also known as the Sphere Sea Urchin or the Tuxedo Urchin
Sabellastarte spectabilis, commonly known as the Indian feather duster worm or feather duster worm, is a tubicolous marine polychaete worm. These worms are characterized by their beautiful, feathery tentacles, which they use to filter feed and breathe. They live in leathery tubes, often covered with mud, and are found in tropical and subtropical waters.
Appearance:
Color: Vibrant colors can range from reds, oranges, to purples.
Tentacles (radioles): The tentacles are feathery and arranged in a fan-like structure, creating a striking display when the worm is active. They are striped in dark and pale brown bands.
Tube: The worms secrete a leathery tube that protects them.
Size: Can reach up to 80 millimeters in length and 10-12 millimeters in width.
Habitat and Behavior:
Location: Native to tropical waters of the Indo-Pacific but have spread to other regions.
Tube: The tubes are typically buried in the sediment.
Filter Feeding: They use their tentacles to capture small particles of organic matter from the water.
Sedentary Lifestyle: They primarily live within their tubes and do not move much.
Reproduction and Other Characteristics:
Asexual Reproduction: They can reproduce asexually by fragmentation.
Regeneration: They can regenerate body parts if damaged.
Aquarium Popularity: They are popular in aquariums due to their beauty and helpfulness in removing organic particles from the water.
The Turbo fluctuosa, commonly called the Mexican Turbo Snail or Super Turbo Snail, is a marine gastropod mollusk known for its unique, top-shaped shell and its effectiveness at consuming algae. These snails are popular in reef aquariums due to their ability to quickly remove nuisance algae, including hair algae, from live rock and aquarium glass.
Key characteristics:
Shell: The Turbo fluctuosa has a thick, top-shaped shell with an iridescent interior. The shell can be olivaceous, green, brown, or grayish, with white longitudinal stripes or spots.
Diet: It's a herbivore that feeds primarily on algae, including hair algae, cyanobacteria, and diatoms. It is also known to consume Asparagopsis algae, which can be problematic in reef aquariums.
Behavior: These snails are active both day and night and move slowly over surfaces, grazing on algae. They can bulldoze loose rocks in search of food, so aquariums with well-secured rockwork are recommended.
Aquarium Care: Turbo fluctuosa snails thrive in well-established tanks with plenty of live rock and are compatible with most reef aquarium inhabitants. Adequate calcium levels are needed for shell growth, and supplemental feedings with dried seaweed may be necessary if algae levels are low.
Origin: They are native to the Gulf of California, off the coast of Mexico.
Size: They can grow up to 2 inches in diameter
