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Mantis shrimp

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Mantis shrimp
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Subphylum:
Crustacea
Class:
Malacostraca
Subclass:
Hoplocarida

Calman, 1904
Order:
Stomatopoda

Latreille, 1817
Suborders, superfamilies and families [1]

Suborder Archaestomatopodea

Tyrannophontidae†

Suborder Unipeltata

Bathysquilloidea
Bathysquillidae
Indosquillidae
Gonodactyloidea
Alainosquillidae
Hemisquillidae
Gonodactylidae
Odontodactylidae
Protosquillidae
Pseudosquillidae
Takuidae
Erythrosquilloidea
Erythrosquillidae
Lysiosquilloidea
Coronididae
Lysiosquillidae
Nannosquillidae
Tetrasquillidae
Squilloidea
Squillidae
Eurysquilloidea
Eurysquillidae
Parasquilloidea
Parasquillidae

Mantis shrimp or stomatopods are marine crustaceans, the members of the order Stomatopoda. They are neither shrimp nor mantids, but receive their name purely from the physical resemblance to both the terrestrial praying mantis and the shrimp. They may reach 30 cm (12 in) in length, although exceptional cases of up to 38 cm have been recorded [2]. The carapace of mantis shrimp covers only the rear part of the head and the first three segments of the thorax. Mantis shrimp appear in a variety of colours, from shades of browns to bright neon colours. Although they are common animals and among the most important predators in many shallow, tropical and sub-tropical marine habitats they are poorly understood as many species spend most of their life tucked away in burrows and holes [3].

Called "sea locusts" by ancient Assyrians, "prawn killers" in Australia and now sometimes referred to as "thumb splitters" by modern divers — because of the relative ease the creature has in mutilating small appendages — mantis shrimp sport powerful claws that they use to attack and kill prey by spearing, stunning or dismemberment. Although it happens rarely, some larger species of mantis shrimp are capable of breaking through aquarium glass with a single strike from this weapon [4].

Ecology

These aggressive and typically solitary sea creatures spend most of their time hiding in rock formations or burrowing intricate passageways in the sea-bed. They either wait for prey to chance upon them or, unlike most crustaceans, actually hunt, chase and kill living prey. They rarely exit their homes except to feed and relocate, and can be diurnal, nocturnal or crepuscular, depending on the species. Most species live in tropical and subtropical seas (Indian and Pacific Oceans between eastern Africa and Hawaii), although some live in temperate seas.

Classification and the claw

Around 400 species of mantis shrimp have currently been described worldwide; all living species are in the suborder Unipeltata [5]. They are commonly separated into two distinct groups determined by the manner of claws they possess:

Squilla mantis, showing the spearing appendages
  • Spearers are armed with spiny appendages topped with barbed tips, used to stab and snag prey.
  • Smashers, on the other hand, possess a much more developed club and a more rudimentary spear (which is nevertheless quite sharp and still used in fights between their own kind); the club is used to bludgeon and smash their meals apart. The "punch" delivered has roughly the acceleration of a .22 caliber bullet.[6][7] The inner aspect of the dactyl (the terminal portion of the appendage) can also possess a sharp edge, with which the animal can cut prey while it swims.

Both types strike by rapidly unfolding and swinging their raptorial claws at the prey, and are capable of inflicting serious damage on victims significantly greater in size than themselves. In smashers, these two weapons are employed with blinding quickness, with an acceleration of 10,400 g and speeds of 23 m/s from a standing start  [8], about the acceleration of a .22 caliber bullet. Because they strike so rapidly, they generate cavitation bubbles between the appendage and the striking surface  [8]. The collapse of these cavitation bubbles produces measurable forces on their prey in addition to the instantaneous forces of 1,500 newton that are caused by the impact of the appendage against the striking surface, which means that the prey is hit twice by a single strike; first by the claw and then by the collapsing cavitation bubbles that immediately follow  [9]. Even if the initial strike misses the prey, the resulting shock wave can be enough to kill or stun the prey.

The snap can also produce sonoluminescence from the collapsing bubble. This will produce a very small amount of light and high temperatures in the range of several thousand kelvin within the collapsing bubble, although both the light and high temperatures are too weak and short-lived to be detected without advanced scientific equipment. The light emission and temperature increase probably have no biological significance but are rather side-effects of the rapid snapping motion. Pistol shrimp produce this effect in a very similar manner.

Smashers use this ability to attack snails, crabs, molluscs and rock oysters; their blunt clubs enabling them to crack the shells of their prey into pieces. Spearers, on the other hand, prefer the meat of softer animals, like fish, which their barbed claws can more easily slice and snag.

The eyes

The front of Lysiosquillina maculata, showing the stalked eyes

Mantis shrimp possess hyperspectral colour vision, allowing up to 12 colour channels extending in the ultraviolet[10]. Their eyes (both mounted on mobile stalks and constantly moving about independently of each other) are similarly variably coloured, and are considered to be the most complex eyes in the animal kingdom.[11][12] They permit both serial and parallel analysis of visual stimuli.

Each compound eye is made up of up to 10,000 separate ommatidia of the apposition type. Each eye consists of two flattened hemispheres separated by six parallel rows of highly specialised ommatidia, collectively called the midband, which divides the eye into three regions. This is a design which makes it possible for mantis shrimp to see objects with three different parts of the same eye. In other words, each individual eye possesses trinocular vision and depth perception. The upper and lower hemispheres are used primarily for recognition of forms and motion, not colour vision, like the eyes of many other crustaceans.

Rows 1-4 of the midband are specialised for colour vision, from ultra-violet to infra-red. The optical elements in these rows have eight different classes of visual pigments and the rhabdom is divided into three different pigmented layers (tiers), each adapted for different wavelengths. The three tiers in rows 2 and 3 are separated by colour filters (intrarhabdomal filters) that can be divided into four distinct classes, two classes in each row. It is organised like a sandwich; a tier, a colour filter of one class, a tier again, a colour filter of another class, and then a last tier. Rows 5-6 are segregated into different tiers too, but have only one class of visual pigment (a ninth class) and are specialised for polarisation vision. They can detect different planes of polarised light. A tenth class of visual pigment is found in the dorsal and ventral hemispheres of the eye.

The midband only covers a small area of about 5°–10° of the visual field at any given instant, but like in most crustaceans, the eyes are mounted on stalks. In mantis shrimps the movement of the stalked eye is unusually free, and can be driven in all possible axes, up to at least 70°, of movement by eight individual eyecup muscles divided into six functional groups. By using these muscles to scan the surroundings with the midband, they can add information about forms, shapes and landscape which cannot be detected by the upper and lower hemisphere of the eye. They can also track moving objects using large, rapid eye movements where the two eyes move independently. By combining different techniques, including saccadic movements, the midband can cover a very wide range of the visual field.

Some species have at least 16 different photoreceptor types, which are divided into four classes (their spectral sensitivity is further tuned by colour filters in the retinas), 12 of them for colour analysis in the different wavelengths (including four which are sensitive to ultraviolet light) and four of them for analysing polarised light. By comparison, humans have only four visual pigments, three dedicated to see colour. The visual information leaving the retina seems to be processed into numerous parallel data streams leading into the central nervous system, greatly reducing the analytical requirements at higher levels.

At least two species have been reported to be able to detect circular polarized light [13][14]. The species Gonodactylus smithii is the first - and only - organism known to simultaneously detect the four linear, and two circular, polarization components required for Stokes parameters, which yield a full description of polarization. It is thus believed to have optimal polarization vision [14][15][16][17].

Close-up of the trinocular vision of Pseudosquilla ciliata

Reasons given for powerful eyesight

The eyes of mantis shrimp may make them able to recognize different types of coral, prey species (which are often transparent or semi-transparent), or predators, such as barracuda, which have shimmering scales. Alternatively, the manner in which mantis shrimp hunt (very rapid movements of the claws) may require very accurate ranging information, which would require accurate depth perception.

The fact that those with the most advanced vision also are the species with the most colourful bodies, suggests the evolution of colour vision has taken the same direction as the peacock's tail.

During mating rituals, mantis shrimp actively fluoresce, and the wavelength of this fluorescence was shown to match the wavelengths detected by their eye pigments [2]. Females are only fertile during certain phases of the tidal cycle; the ability to perceive the phase of the moon may therefore help prevent wasted mating efforts. It may also give mantis shrimp information about the size of the tide, which is important for species living in shallow water near the shore.

Another theory is that the invertebrate brain is unequipped to analyse all the incoming data in real time and so the processing is performed physically by the eye.

Behavior

Mantis shrimp appear to be highly intelligent. They are long-lived and exhibit complex behaviour, such as ritualised fighting. Some species use fluorescent patterns on their bodies for signaling with their own and maybe even other species, expanding their range of behavioural signals. They can learn and remember well, and are able to recognise individual neighbours with whom they frequently interact. They can recognise them by visual signs and even by individual smell. Many have developed complex social behaviour to defend their space from rivals.

In a lifetime, they can have as many as 20 or 30 breeding episodes. Depending on the species, the eggs can be laid and kept in a burrow, or carried around under the female's tail until they hatch. Also depending on the species, male and female may come together only to mate, or they may bond in monogamous long-term relationships.

In the monogamous species, the mantis shrimp remain with the same partner for up to 20 years. They share the same burrow, and there are reasons[which?] to suspect that these pairs can coordinate their activities. Both sexes often take care of the eggs (biparental care). In Pullosquilla and some species in Nannosquilla, the female will lay two clutches of eggs, one that the male tends and one that the female tends. In other species, the female will look after the eggs while the male hunts for both of them. Once the eggs hatch the offspring may spend up to three months as plankton.

Although stomatopods typically display the standard locomotion types as seen in true shrimp and lobsters, one species, Nannosquilla decemspinosa, has been observed flipping itself into a crude wheel. The species lives in shallow, sandy areas. At low tides, N. decemspinosa is often stranded by its short rear legs, which are sufficient for locomotion when the body is supported by water, but not on dry land. The mantis shrimp then performs a forward flip, in an attempt to roll towards the next tidepool. N. decemspinosa has been observed to roll repeatedly for 2 m, but typically specimens travel less than 1 m.[18]

Cookery

An 1896 drawing of a mantis shrimp

In Japanese cuisine, the mantis shrimp is eaten raw as sashimi and as a sushi topping, and is called shako (蝦蛄). It is commonly served in Japan, but is not often found on the menu at sushi restaurants in the United States [citation needed].

In Cantonese cuisine, the mantis shrimp is a popular dish known as "pissing shrimp" (攋尿蝦, Mandarin pinyin: lài niào xiā, modern Cantonese: laaih niuh hā) because they tend to shoot a jet of water when picked up{Fact|date=July 2007}}. After cooking, their flesh is closer to that of lobsters than that of shrimp, and like lobsters, their shells are quite hard and require some pressure to crack.

In the Mediterranean countries the mantis shrimp Squilla mantis is a common seafood, especially on the Adriatic coasts.

The usual concerns associated with consuming seafood are an issue with mantis shrimp, as they may dwell in contaminated waters. This is especially true in Hawaii where some have grown unnaturally large [2].

Aquariums

Many saltwater aquarists keep stomatopods in captivity. These aquarists may play a role in understanding the mysteries of the mantis shrimp. However, mantis shrimp are considered pests by other aquarium hobbyists because many smasher species create burrows in the exoskeletons of dead corals. These coral remains are useful in the marine aquarium trade and are often collected. It is not uncommon for a piece of coral skeleton, also known as live rock, to also ferry a live mantis shrimp into the aquarium that this live rock is placed into.Once inside the tank, they may feed on fish, corals and smaller crustaceans. However, when kept in species tanks, they are considered intriguing, as some are intelligent enough to be able to recognize their keepers by sight.They are notoriously difficult to catch when established in a well-stocked tank [19] and although there are accounts of them breaking and destroying glass tanks, such incidents are very rare[20].

References

  1. ^ J. W. Martin & G. E. Davis (2001). An Updated Classification of the Recent Crustacea (PDF). Natural History Museum of Los Angeles County. pp. 132 pp.
  2. ^ a b c James Gonser (2003-02-14). "Large shrimp thriving in Ala Wai Canal muck". Honolulu Advertiser.
  3. ^ Ross Piper (2007). Extraordinary Animals: An Encyclopedia of Curious and Unusual Animals. Greenwood Press. ISBN 0313339228.
  4. ^ April Holladay (2006-09-01). "Shrimp spring into shattering action". USA Today.
  5. ^ "Stomatopoda". Tree of Life Web Project. 2002-01-01. {{cite web}}: Check date values in: |date= (help)
  6. ^ Strongest Punch in the World on YouTube
  7. ^ BBC Science & Nature - Fact Files: Mantis Shrimp
  8. ^ a b S. N. Patek, W. L. Korff, and R. L. Caldwell (2004). "Deadly strike mechanism of a mantis shrimp". Nature. 428: 819–820. doi:10.1038/428819a. {{cite journal}}: Unknown parameter |quotes= ignored (help)CS1 maint: multiple names: authors list (link)
  9. ^ S. N. Patek & R. L. Caldwell (2005). "Extreme impact and cavitation forces of a biological hammer: strike forces of the peacock mantis shrimp". Journal of Experimental Biology. 208: 3655–3664. doi:10.1242/jeb.01831. PMID 16169943. {{cite journal}}: Unknown parameter |quotes= ignored (help)
  10. ^ Justin Marshall & Johannes Oberwinkler (1999). "Ultraviolet vision: the colourful world of the mantis shrimp". Nature. 401: 873–874. doi:10.1038/44751.
  11. ^ "Mantis shrimp have the world's most complex colour vision system." - Justin Marshall, University of Queensland
  12. ^ Patrick Kilday (2005-09-28). "Mantis shrimp boasts most advanced eyes". The Daily Californian. {{cite web}}: Check date values in: |date= (help)
  13. ^ Tsyr-Huei Chiou, Sonja Kleinlogel, Tom Cronin, Roy Caldwell, Birte Loeffler, Afsheen Siddiqi, Alan Goldizen, Justin Marshal (2008). "Circular Polarization Vision in a Stomatopod Crustacean". Current Biology. 18: 429. doi:10.1016/j.cub.2008.02.066. {{cite journal}}: Unknown parameter |month= ignored (help)CS1 maint: multiple names: authors list (link)
  14. ^ a b Sonja Kleinlogel, Andrew White (2008). "The secret world of shrimps: polarisation vision at its best". PLoS ONE. 3: e2190. doi:10.1371/journal.pone.0002190.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  15. ^ Daniel Cressey (2008-05-14). "Shrimp's super sight". The Great Beyond. nature.com. {{cite web}}: Check date values in: |date= (help)
  16. ^ Anne Minard (2008-05-19). ""Weird beastie" shrimp have super-vision". National Geographic News. {{cite web}}: Check date values in: |date= (help)
  17. ^ P. Z. Myers (2008-05-24). "The superior eyes of shrimp". Pharyngula. {{cite web}}: Check date values in: |date= (help)
  18. ^ Roy L. Caldwell (1979). "A unique form of locomotion in a stomatopod — backward somersaulting". Nature. 282: 71–73. doi:10.1038/282071a0.
  19. ^ Nick Dakin (2004). The Marine Aquarium. London: Andromeda. ISBN 1-902389-67-0.
  20. ^ Rodney Wong. "Stomatopods 101: basic care of mantis shrimp".
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