【Alias】
【Boundary】Animal kingdom
【Purpose】Full eye
【Family】Spoon finger shrimp family
【Genus】Rice shrimp genus
Guangdong rice shrimp, its origin is Guangdong, in 1938 was named Guangdong rice shrimp, body length of 21 ~ 28mm. If you look at the side of the frontal angle, you will find that its frontal horn is slightly raised and narrow above the eye, but it will rise slightly at the end of the frontal horn, and some of these individuals will have an upward tendency, but not more than the second end of the first antennae handle. The anterior lateral corners are rounded and do not have buccal spines. The distribution of rice shrimp in Guangdong is relatively widespread, mainly distributed in Vietnam abroad, and mainly distributed in Guangdong, Hong Kong, Guangxi and other places in China. Folk rice shrimp, usually seen in small streams in the mountains, like to crawl on stream rocks, or live in areas with dense aquatic grass, in Guangdong is mostly found in suburban ponds or rivers, with a lot of production.
【Morphological characteristics】 The frontal horn is narrow laterally, slightly raised above the eye, the end is slightly raised, and some individuals are significantly upturned; usually slightly beyond the end of the 2nd section of the 1st antennal stalk, and a few individuals only extend to the middle of the 2nd segment, or extend to the end near the 3rd segment; the upper margin has 9-17 (mostly 14-16) teeth, distributed in 2/3 of the base of the frontal horn, the basal teeth are arranged more closely, the arrangement of the ends is sparser, and the base has 5-7 (mostly 6) teeth on the cephalothorax at the posterior edge of the orbit; the lower edge has 2-6 ( Most of them are 3-4, and a few have only 1) teeth, which are distributed on the anterior and lower edges of the upper margin of the last tooth. The cephalothorax is about 2 times the length of the frontal horn, with rounded anterior lateral horns and no buccal spines. Caudal dorsal mask 5-7 (mostly 5-6) pairs of movable spines, the posterior end is rounded, there are 1 triangular short spines in the center of the dorsal surface, and the outer posterior spines are smaller. The lateral spines are slender, similar to the length of the interminal spines, about 4 times the length of the lateral posterior spines. There are 3 pairs of spines, about equal length. The anterior ridge is rounded and blunt, without spines, and no bristles are seen. The 1st antennal stalk spine is long, far beyond the end of the basal segment, about the middle of section 2, and the 1st is saved as 1 of section 2. 6 times, section 2 is slightly longer than section 3. The second antennal scale is about 3. 5 times. The outer end of the inner limb of the first jaw foot is rounded and does not have a leaf-like protrusion. The 3rd jaw foot extends to the end of or slightly beyond the 3rd segment of the 1st antennal handle; the terminal segment is longer than the last 2 or 3 segments, the apex is claw-shaped, and the terminal ventral margin has 7-8 short spines. 1 step to the end of the eye; the seat is saved to 1/2 of the long node. 5, the length of the long section and the wrist saving is equal in length, the end of the wrist segment is deeply concave, and the length is wide 1. 5—1． 7 times, shorter than the length of the chelation, refers to the savings of 1. 5—1． 6 times, the length of the chelation is 1. 9—2． 2 times. The length of the two sexes of the second step is different, the male is slightly longer, about to the end of the 3rd segment of the 1st antennal stalk, the female is slightly shorter, only extending to the middle to the end of the 3rd segment; the seat is 1/2 of the long segment, the long segment is slightly shorter than the wrist segment, and the length of the wrist segment is 4. 5—5． 0 times, the length of the chelate is 2 times wider. 5—2． 7 times, knuckles for the palm of the minister 1. 2—1． 3 times. The length of the two sexes in step 3 is about the same, and the palm economy extends 1/3-1/4 to the end of the first antennae handle; the seat economy is 1/3 of the long section. 5, long saving for the wrist joint of 1. 6 times, the ventral margin has 4 spines, the wrist saving is 3/4 of the length of the palmar segment, the abdominal edge has small spines, and the palmar segment length is 9. 5-11 times, 3 times for knuckles. 8—4． 1 times, knuckle length is 3. 6—4． 0 times, the ventral margin has 5-6 spines. Step 5 The foot extends approximately to the middle to the end of the 3rd section of the 1st antennal stalk; the seat saves 0 near the long section. 3 times, long savings for 1. 5 times, the ventral margin has 3 spines, the wrist segment is slightly more than half the length of the palmar segment, the ventral margin and the end abdominal horn are thorny, the palmar segment is about 16 times the length of the terminal, which is 3 times the length of the knuckle. 8—4． 0 times, knuckle length for width of 5. 5—5． 7 times, the ventral margin has 32-45 spines. The inner limb of the first abdominal limb of a male is broad-lobed, greater than half the length of the outer limb, and in fully developed individuals, its end is wider than the base and its length is about equal to the length of the terminal width2. About 5-3 times, the medial side has several short spines, the medial middle is concave, the lateral margin is straight, the basal half has several pinnate bristles, the last half is a moving spine, the spiny bristles gradually increase from the base to the end, the outer side of the thorn at the end is longer, the inner side is slightly shorter and thicker; the inner appendage extends obliquely from the medial end half to the end, about to the end of the inner limb, and the inner end angle has many small hooks. The male appendage of the second abdominal limb is particularly short and thick, with the end length being twice as long as it is 2 times wider, and the medial and terminals of the base are covered with many strong spines; the inner appendage is short and thick, extending about to the middle of the male appendage.