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Trombidium grandissimum  Giant red velvet mite insect, even this insect also known as Rain's insect. the northern and central India call this insect by local language with Badal kida, Bhir-buti, Birbhoti and Bir Bahoit. Even this insect found in south west India (Citation needed), This insect belonging to the subclass Acari and Family Trombidiidae. The red bug or T.grandissimum Usually these insect seen around rainy season or after rain therefore this insect called as "rain bug" in other parts of the world.

T.grandissimum species also have a soft cushioning skin covered with bright reed colored hairs. Usually these insects are terrestrial and lives in soil burrow. These insects found in the dry, arid, desiccating regions where the climate is of extreme. These mites are predatory in nature and feeds on termites and eggs of insects, like ants. They share many similarities with the order Aranae. This insect is not only famous for its bright red velvet body, rather than it is used for therapeutic usage in the treatment of paralysis and sexual. Insect Behavior is often describes as the morphological and physiological interesting facts of structural analysis, evolution of an organism in response to the environmental change. The insect is very interesting for all mankind in the stimulating of nervous system as the above statement concludes.

Insect parts analysis through microscope:

The mites were observed under stereo microscope for the detailed classification and analysis of different parts of their body.


 * 1) Eyes & other parts observed and imaged under stereo microscope.
 * 2) Structural samples were processed for ESEM and FESEM.

The ESEM Body parts were dissected out and mounted on a double-sided adhesive black carbon tape fixed on small pieces of glass slides. Then the samples were viewed under environment Scanning Electron Microscope (QUANTA FEG 250) different magnification with an operating of 10kV.

For FESEM, the part of T.grandissimum to be imaged was first dissected out and kept for the few days to dry. Then the sample, fixed on a black carbon tape was given for gold coating uner an Icon Analytic coating machine for one hour and then viewed under FEI-Field Emission Scanning Electron Microscope (NOVA NANOSEM 450) at different magnification with an operating voltage of 10kV.

UV gel doc imaging:

Mites were amaesthatised and imaged under tran - UV and epi - white light in UV gel doc machine (BIORAD gel Doc UV).

The Structural Analysis results.

The FESEM images showing the front leg sensillary haris and claws at the tip usually measurement around 500μm. Stalked eyes pointed with white arrow, measures around 1mm. White arrows magnified by ESEM can measures around 400μm. The red velvet skin is like fluffy by various hairs usually they are called Sensitive hairs ESEM image of the skin shows the tuft of hairs covering it and measures around 500μm. The whole body hairs showing the branches and arrangement which measures around 50μm in size.

Behavioral study:


 * 1) Response to light and dark.
 * 2) The polarized light vision.
 * 3) The light sensitivity test.
 * 4) The color and pattern recognition test.
 * 5) Angle of vision.
 * 6) Taste sensitivity.
 * 7) Touch sensitivity.
 * 8) Variation in speed.
 * 9) Variation in side reflex.
 * 10) Temperature sensitivity.
 * 11) Sensitive towards chemical like ether.
 * 12) Starvation and dehydration test:
 * 13) Food habitat test.

T.grandissimum were found to be very much sensitive towards light and they become activated when light was focused on them with a touch. They were to climb up to the source of light being attracted towards it. And even the structural analysis also conclude the species by various changes in body parts. The total analysis is concluding the insect as T.grandissimum.

As the mentioned study literatures results in the Spider mites Tetranychus urticae which undergo hibernation, changes its body color from green to orange due to the synthesis of red colored carotene pigments. Carotene does not only serve as vitamin for them but helps them during hibernation. This insect is also relation with bright red color of T.grandissimum. T.grandissimum belonging to the same order as spider mites spend an extensive period of time in hibernation under the soil. This might be the reason why they also depend on such kind of red pigment for which their haemolymph is usually red in color.

In their natural habitat they were found to move on horizontal plane. They seemed to be reluctant to climb up against the gravitational force may be due to other bulky body size and shorter legs. They can easily wriggle their bodies through small openings and thus can easily get inside the burrows of ants and other insects to feed on their eggs. Males and Females of Trombidiidae mites perform encircling dances, after which pair for mating. This behavioral concept as similar expected in T.grandissimum as they were also found perform similar kind of ovement while studying in their natural habitat. A dead mites was found to be surrounded by ants suggesting that the are non-toxic to other species and their cannibalistic nature suggests the same.

@Prashant karadakatti - Scientific Researcher and Macro photographer (Data Collected and represented).