Category: Entomology
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INSECT DIGESTIVE SYSTEM
Insect digestive system is of complete type which means starting from mouth, the alimentary canal terminates as anus. Along its length, alimentary canal is associated with salivary gland, salivary reservoir, hepatic or gastric caeca and Malpighian tubules (act as osmoregulater). Alimentary canal vary in size(diameter), anatomically modified structure as per the type of role during…
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Larva and it’s Types
Larva It has been defined as an intermediate stage in the life history of Invertebrates and few lower chordates. In class Insecta, larva signifies the reproductively immature stage which is determined for feeding and gathering energy for transformation into adult. Class Insecta is a diverse category among the animal kingdom. Many of them vary in…
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Parthenogenesis in Insects
Parthenogenesis It has Greek origin as “parthenos” which means “virgin birth”. Virgin birth means development of egg cell into an embryo without being fertilized by sperm. Hence parthenogenesis has been defined as the asexual reproduction in which organism developes from an unfertilized egg. Many insects reproduce by this mode of reproduction. This may occur due…
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Pupa and it’s Types
Pupa This stage has been defined as the quiescent stage subjected to the development of Adult/ Imago. There are two broad divisions of Pupa in class Insecta based upon presence and absence of functional mandibles: Decticous Pupa Adecticous Pupa DECTICOUS PUPA Articulating mandibles are present that helps in tearing the pupal case or cocoon. Example-…
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METAMORPHOSIS
Hexapods are oviparous i.e. reproduction results into egg laying by adult female. Although hatchlings are quite different different in morphology and feeding habits.To achieve adult form these hatchlings undergo post embryonic development of several stages which may vary in size shape and feeding. The whole process is termed as Metamorphosis. GENERAL MODEL OF METAMORPHOSIS IMPORTANT…
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Body Wall – Insecta
Insects are featured by presence of exoskeleton or cuticular body wall which specifies it’s Arthropoda character. BODY WALL STRUCTURE Cuticle The body wall provides with two distinct layers of cuticle: EPICUTICLE = present externally lacks chitin component. It is of variable types among different orders of insects. PROCUTICLE = present next to epicuticle. Incorporated…