Shrimp mayfly, English name Mantis Shrimp (Mantis Shrimp), belongs to the phylum Arthropoda, subphylum Crustacea, Mollusca, subclass Prawn Swimming, stomatopods (this subclass below an order). Different regions of China's people for the shrimp mayfly called different, such as: shrimp mayfly, shrimp crawler, crawling shrimp, shrimp tiger, belt shrimp, shrimp, shrimp, shrimp, shrimp, shrimp, shrimp, shrimp, shrimp, shrimp, shrimp, shrimp dog pop, pop shrimp, shrimp, rich shrimp, pipa shrimp, flowers do not come to the insect, shrimp popping insects, shrimp, shrimp, shrimp, shrimp, shrimp, not only the water scorpion, PiPi shrimp, and so on.

Classification: In addition to the fossilized species of ancient Sculdidae, the extant species are divided into seven general families: Bathysquilloidea, Gonodactyloidea, Squilloidea, Lysiosquilloidea, and Lysiosquilloidea. Lysiosquilloidea), Erythrosquilloidea, Eurysquilloidea, and Parasquilloidea. All are marine. The prawns originated in the Jurassic of the Mesozoic Era, and there are more than 500 extant species, most of which live in the tropics and subtropics, and a few are found in the temperate zone. China's coast are, the most common species is the shrimp mayfly family, mouth shrimp mayfly genus of mouth shrimp mayfly (Oratosquilla oratoria), in China's waters are distributed; South China Sea species are the most, has found more than 80 species.

Morphological features:

Taking the mouth shrimp mayfly (Oratosquilla oratoria) as an example: the anterior margin of the cephalothorax has a movable trapezoidal frontal horn plate in the center of the cephalothorax, and there is a movable ocular node and antennal node in front of it. The abdomen is broad, with *** six segments, ending in a broad and short caudal segment, which has a central ridge on the dorsal surface and a strong spine on the posterior margin.

The first antennal peduncle is slender, three-segmented, and terminated by three tentacle whips, which are responsible for the sense of touch. The second antennal peduncle is two-segmented, bearing a tentacular whip and an oblong scale. Mouthparts and jaws very hard, divided into molar and incisor parts, both with tooth-like projections, capable of cutting and grinding food; jaw tentacles three-segmented, inconspicuous, sensory. The first mandible is small, with a two-segmented protopod, and its inner margin is armed with spiny hairs. The second small jaw is lamellar, consisting of four segments, and its inner margin is densely hairy. These two pairs of jaws assist the larger jaws in tearing up food. The thorax is equipped with eight pairs of appendages, the first five pairs of jaws and the last three pairs of gaiters (the opposite of the Decapoda's three pairs of jaws and five pairs of gaiters). The first pair of jaws are elongated, with truncated terminal segments and brush-like hairs; the second pair of jaws are particularly powerful, with the terminal segments (phalanges) laterally flattened, with six pointed teeth that fit into the marginal grooves of the metacarpal segments, which are used as predatory and antagonistic tools called predatory limbs; the third to fifth pairs of jaws are shorter than the first, and terminate in a chelicerae. The third to fifth pairs of jaws are shorter than the first pair and end in a small cheliped. These appendages are capable of delivering captured food into the mouth. All five pairs of jaws have no external limbs, but have a basal lamellar epipod. The stepping foot is weak and chela-less, with a three-segmented protopod, underpinned by an inner and outer limb, and is not adapted for crawling. Males have a pair of elongate cross-bars medially at the base of the third stepping foot. The first five abdominal segments of the abdomen each have a pair of abdominal limbs, consisting of stalked segments and flat, leaf-shaped inner and outer limbs, which have the functions of swimming and respiration. The gills are borne at the base of the outer limbs and have many branched gill filaments. The inner limb of each abdominal limb has a small inner appendage on the inner side, and the corresponding small inner appendage on the other side of the interconnection, so that a pair of abdominal limbs into a whole, to facilitate swimming. The inner limbs of the first pair of abdominal limbs of males are deformed and become grippers, which are used to hold the female during mating. The last pair of abdominal appendages is a well-developed caudal limb, with one protopod, two exopods, and one endopod, lamellar. The inner side of the protopod has a powerful forked spinous process, called the basal or double spinous process, which extends between the inner and outer limbs. The caudal limb and the caudal segment form the caudal fan, which, in addition to its swimming function, can be used for burrowing and defense. Shrimp mayflies mouth is located in the ventral surface between the two jaws, the mouth through the esophagus into the stomach, followed by the intestinal tract, longitudinal abdomen, back to the anus. The anus opens on the ventral surface of the caudal segment. The heart is long and tubular, extending from the dorsal surface of the cephalothorax posteriorly to the fifth abdominal segment, and the heart extends arterial vessels to the sides and anteriorly and posteriorly to all organs and tissues. In females, the reproductive pores are in pairs, mostly opening on the ventral surface of the sixth thoracic segment, and the ovaries are located on the back of the body below the heart, and extend backward from the cephalothorax through the abdomen to the caudal segment when the eggs are conceived. In males, the pair of genital pores is on the ventral surface of the terminal segment of the thorax. The small palatine glands at the base of the second antennae on the head are excretory organs.

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