Chapter 946: The Insects Are Also Not Right

Distinguishing 3rd instar larvae is relatively simple. Because this is the last step from larvae to adults, its body shape has become very large, and you can clearly see what it looks like. Next, it can pupate into a fly.

Therefore, sometimes what breaks the cocoon and feathers is not necessarily a butterfly, it may be a moth, or it may be a fly.

Under Jiang Yuan's guidance, Wan Wan Baoming quickly became familiar with several common 3rd instar larvae.

Biology is practiced, and learning is very fast. Reading books and pictures in school, memory is always unclear, what eighth and ninth abdominal segments, but if you see real ones, see more times, compare more times, the brain remembers very fast.

For example, the maggots most common in dry toilets, round cylinders, a bit flat, tail sharp, surface a bit transparent, slightly yellowish maggots, it is the 3rd instar larva of the blowfly family, scientific name (ChrysomyiamegacephalaFabricius).

The blowfly is also the most common necrophagous fly, especially in places with many dry toilets, but if a corpse appears, a blowfly will definitely fly over to lay eggs, thus becoming a good helper for forensic doctors.

The blowfly not only helps forensic experts, but it also has benefits for our country's traditional Chinese medicine industry. TCM uses "maggots" as medicine, mainly treating "spleen deficiency and accumulation; clearing heat and eliminating malnutrition." Here, one must pay special attention to the fact that some medicinal merchants nowadays still use the larvae of other fly species as medicine, because ordinary people don't understand the trade and are easily fobbed off with inferior goods. Especially now that drugs are directly ground into powder, even if the crushed maggots don't match the product, there is nowhere to file a complaint.

Therefore, when you really use "five-grain insects", if you can't catch them yourself and don't want to be deceived, you can first observe and learn in the dry toilet. Only a few provinces in China lack the distribution of blowflies, mainly Heilongjiang and Jilin provinces, and Qinghai, Gansu, and Xinjiang provinces. In other places, it is very easy to find.

For people in these places, if they really don't know how to distinguish, they can compare with the calves of ballet dancers. The shape and appearance are basically the same, indicating that the beauty and ugliness of the world are indeed connected.

With Wan Wan Baoming's help, Jiang Yuan quickly began to screen eggs and pupae.

Flies are a complete metamorphosis—it develops from egg to larva, then from larva to pupa, then from pupa to adult, each time it is a complete metamorphosis, that is, it completely becomes another look.

This makes every form of fly have a special look, and identifying it... can only be said that it is not difficult for those who know it.

Despite this, when Jiang Yuan began to classify the eggs of flies, Wan Wan Baoming still widened his eyes.

"Do you really know who laid the eggs at a glance?" Wan Wan Baoming has also seen and eaten... or in other words, worked with entomology big shots, and he has never seen this.

Normal big shots, if they want to do such detailed classification, when classifying into specific varieties, they actually need to check tool books, such as "Chinese Animal Records", "Chinese Economic Insects Records", "Chinese Common Fly Retrieval Table", etc.

This is like a text expert, also needing "Shuowen Jiezi" and "Kangxi Dictionary".

Jiang Yuan didn't need to explain too much to Wan Wan Baoming, just smiled and said: "It's not that I can see it at a glance, sometimes I have to look a few more times..."

Mu Mu Zhiyang couldn't help but raise his head and look at Jiang Yuan: "Team Leader Jiang, you are a bit humorous when you look at fly eggs."

Jiang Yuan smiled, didn't even raise his head, and said: "You wear another pair of gloves, help me clear out the insects and eggs in these bottles, and place them on the glass plate, so it will be easy for me to identify later."

Mu Mu Zhiyang said "Oh", put on gloves, took a bottle specified by Jiang Yuan, opened the bottle stopper, and smelled a rich stench.

The stench was sucked away by the ventilation equipment on the head, just letting Mu Mu Zhiyang have a full meal.

The scene investigation personnel will not carefully distinguish the types of these insects. In the final analysis, it is a spoonful of scooping, poisoning and pouring into the bottle and bringing it back. Many bottles, except for insects and eggs, will inevitably bring a little corpse water.

At that time, it was covered by the richer smell at the scene, and I didn't feel it. When I returned to the laboratory and smelled it, it would be very head-on.

Not long after, the black leather test table was full of the bodies of various maggots, and the insect eggs only a millimeter in size were also placed in disposable plastic culture dishes, arranged neatly one by one.

Mu Mu Zhiyang accompanied to write labels, and pasted them one by one.

In addition to this, more are insects that do not belong to flies and the larvae and eggs of insects.

They are all trivial fine work, but only by doing it carefully can it be the turn to judge the time of death.

In fact, the main work lies in distinguishing the types of eggs, larvae, pupae, and adults. The remaining work, theoretically, is not much, as long as it is step by step...

"These insects are not right." Jiang Yuan stopped while looking.

"The insects are not right?" Wan Wan Baoming didn't realize what was going on for a while.

Jiang Yuan gave an "en", and then studied while looking at the records he made.

A room of technicians heard the conversation between the two and stopped subconsciously.

Many operations are lossy operations. In the case of no rush, waiting is always right.

Jiang Yuan sat down on his own, studied with a pen, looked at Wan Wan Baoming again, and said: "I look at it now, I feel that what I see is not a lineage of flies, not a group, nor two groups..."

Usually, after a corpse appears, the flies nearby will come to lay eggs at the fastest speed. This fastest speed is often calculated in seconds. In addition, the lineage of flies is relatively clear. How many days to hatch, how many days to grow, can't say accurate, but there is always a spectrum.

Forensic entomology is to judge the time of death based on the reproduction and growth of insects.

For example, it takes about 20 days to grow to 3rd instar insects, then the deceased died about 20 days ago. If the dead are longer, it can also be the second generation and third generation of insects, and the time is superimposed and calculated.

There is also a cold knowledge here, the adult flies generally break out of the cocoon, and start to reproduce a few hours later. It doesn't delay work, and it doesn't delay the forensic doctor's time calculation.

However... the feeling these insects gave Jiang Yuan was not so clear.

Wan Wan Baoming asked: "The corpse we found is at the second scene, did the two scenes interfere with the time or something?"

"Interference is definitely interference, the problem is, judging from the current status of the flies..." Jiang Yuan said here, pointed to the record book, and said: "My judgment, the scene we found is no longer the second scene, but the third scene."

"Ah?" Wan Wan Baoming was stunned: "Third scene? The corpse was moved twice? Why?" ===== CHAPTER 947 =====