[Tyrophagus palmarum and its hypopus found in feed of Tenebrio molitor]

To observe the Tyrophagus palmarum and its hypopus in feed of Tenebrio molitor.

Feed samples were collected from T. molitor farms, and T. palmarum and its hypopus were separated from the samples by the vibration sieve method and floating method. The glass specimens were prepared and T. palmarum and its hypopus were observed under an optical microscope.

Under the light microscope, the skin of T. palmarum was smooth and bright, the color of legs and chelicerae was relatively dark, the length of dorsal seta d₂ was 3-4 times longer than d₁ and la; The ω₁ in tarsus of leg Ⅰ, Ⅱ was short rod, and its top was not tapered; the sucker plate in tarsus of leg Ⅳ located in the middle of the section. The hypopus was oblate, and there were two pairs of legs in front which extended to body. The rear end of hypopus became pointless and round, wrapping around a transparent and ossification skin.

Light microscopy shows the morphological characteristics of T. palmarum and its dormant body, providing the basis for identifying the hypopus.