CLASSIFICATION OF SCHISTOCERCA GREGARIA (LOCUST) ​

KINGDOM :- ANIMALIA (Multicellular eukaryotic organisms)

PHYLUM :- ARTHROPODA (Jointed appendages.)

CLASS :- INSECTA (3 pairs of legs.)

ORDER :-   ORTHOPTERA (Straight wings.)

FAMILY :- ACRIDIDAE (Wings develop externally. )

GENUS :- Schistocerca

SPECIES :- gregaria

GEOGRAPHICAL DISTRIBUTION

  • It is commonly found in Africa, Arabia, India, Mexico, Japan, Philippines. Afghanistan and U.S.A.

HABIT AND HABITAT

  • Schistocerca is solitary, herbivorous insect found abundantly in the green vegetation. It feeds on the grass or leafy vegetation.

SCHISTOCERCA GREGARIA DIAGRAM (LOCUST) ​ARTHROPODA

GENERAL CHARACTERSTICS OF GRYLLUS (CRICKET)

  • Commonly called as the desert locust
  • Their colour and form blending with the grass or vegetation among which they live. 
  • Body is differentiated into head, thorax and abdomen. 
  • Head lies into prothorax with mouth bent downwards. It contains chewing and biting mouth parts with large compound eyes and short antennae.
  • Walking legs are three pairs, adapted for crawling. Posterior legs are modified for crawling. Tarsi 3 or 4 jointed cerci show little segmentation.
  • Wings are two pairs; forewings are leathery, while hind wings are membranous and have well developed anal field.
  • Abdomen has 11 cylindrical segments and each segment contains a pair of spiracle in ventrolateral position.
  • Sexes are separate. Male has anal styles and female is provided with indistinct ovipositor.
  • They have stridulating organs and organs of hearing.
  • Desert locusts have two phases-
    1. Solitary or non-migratory phase with yellow colour, and 
    2. Migratory phase with pinkish body. During migratory phase they migrate towards plain green fields.
SCHISTOCERCA GREGARIA (LOCUST) ​ARTHROPODA

ECONOMIC STATUS

  • Harmful insect in 3 ways :

    1. As crop pest : Grasshoppers always move into new feeding grounds damaging crop and green plantation. Both adults and nymphs destroy succulent vegetation.
    2. As intermediate host : Locust acts as intermediate hosts for helminth parasites.
    3. Useful insect : Locust provides food as eggs, nymphs and adults are eaten as food by predatory insects, birds, reptiles, mammals and even man.

IDENTIFICATION

  • The animal has membranous wings and all above characters, hence it is Locust.

SCHISTOCERCA GREGARIA (LOCUST) ​ARTHROPODA
SCHISTOCERCA GREGARIA (LOCUST) ​ARTHROPODA
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