or genital pouch whose anterior parts contains female gonopore, spermathecal pores, collaterial glands and posterior parts constitutes the oothecal chamber in which the cocoons are formed. In males, the genital pouch lies at the hind end of the abdomen bound dorsally by th and th terga and ventrally by the th sternum. It contains the dorsal anus and ventral male genital pore. In both the sexes, genital apertures are surrounded by sclerites called gonapophysis .
Male bears a pair of short and slender anal styles in the th sternum which are absent in the female. In both sexes, the th segment bears a pair of jointed filamentous structures called anal cerci and bears a sense organ that is receptive to vibrations in air and land. The th sternum of male has a pair of large and oval apical lobes or gynovalvular plates which form a keel like structure which distinguishes the male from the female. Figure .
Periplaneta americana 2FHOOXV &RPSRXQG H\H 0D[LOOD 0D[LOOD 0D[LOOD 0DQGLEOH 0DQGLEOH 0DQGLEOH /DEUXP /DEUXP /DELXP +HDG 0RXWK3DUWV /DELXP *ULQGLQJ UHJLRQ +\SRSKDU\Q[ ,QFLVLQJ UHJLRQ One of the fastest moving land insects is the cockroach. They can move as fast as . Km per hour. antennae and appendages around the mouth.
Antennae have sensory receptors that help in monitoring the environment. The appendages form the mouth parts which are of biting and chewing type ( Mandibulate or Orthopterus type ). The mouth parts consist of a labrum (upper lip), a pair of mandibles , a pair of maxillae , a labium (lower lip) and a hypopharynx (tongue) or lingua (Figure . ).
The thorax consists of three segments – Prothorax , Mesothorax and Metathorax . The prothoracic segment is the largest. The head is connected with thorax by a short extension of the prothorax called as the neck or cervicum . Each thoracic segment bears a pair of walking legs.
Due to the presence of three pairs of walking legs it is also called hexapoda (hexa-six, poda-feet) All the three pairs of walking legs are similar and each leg consists of