Activity

TMEN513 lab exam Tick and mites
Student name: Mr. Vanheuang Phommadeechack ID: 6436660

Question 1: What is the respiratory organ of the suborder Astigmata? How do they breathe?
Answers: The suborder Astigmata includes the family Sarcoptidae (itch mite) and family Pyroglyphidae (house dust mites). In general, they breathe by means of tracheae, or air tubes, but in many species, respiration takes place directly through the skin.

Question 2: What is the difference between hard tick and soft tick? How you differentiate between male and female of hard tick?
Answers:
The difference between Hard tick and soft tick are: Hard tick has the hard plate on the back of the body called scutum or dorsal plate and mouthparts project out in front of the body call false head, hard ticks have eyes on the scutum of dorsal part. For soft tick, mouth part is underneath the body, no eyes and no hard plate on the body. Its body is flexible, tough, bulbous bodies that cover the mouthparts and most of the legs
Differentiation between male and female hard tick:
The characteristic of adult hard tick that use to differentiate male and female hard tick is scutum, the scutum of male hard tick is cover the whole body but for the scutum of female hard tick is cover only 1/3 part of the body. For other characteristics, both male and female are quite similar such as both male and female have 4 pairs of legs (8 legs), spiracle located posterior to the base of the fourth pair of legs and the mouth part protruding anteriorly.

Question 3: Please describe how you characterize the mites (at least two groups)
Answers:
Mites are the arthropod that classified in class Aracnida and subclass Acari. It can cause the disease (house dust mite, scabies mite, etc) and it also can be the vector to transmit the disease (chigger mites). I will describe some groups as below
– Characteristic of house dust mite (Dermatophagoides spp.): the size is very small, cuticle finely or coarsely wrinkled, the genital organ is located between last two pairs of legs, found anus in ventral. Reverse y or v shape of valva (female), in male there is genital opening and we can see that v shave of the sexual organ of male is smaller than female.
– Characteristic of Trombiculid mite (Chigger mite): Chigger mite is the vector of scrub typhus (caused by Orientia tsutsugamushi), it has 3 pair of legs in the larval stage, palpi have 5 segments, there are two segment in the chelicerae and we can found the scutum bears in the dorsal.

Note: The scientific name cannot write in italic in the comment.