Answer to the Questions of the Endocrine System and Chemical Messengers
rubabAnswer to the Questions of the Endocrine System and Chemical Messengers Q.20. Why the thyroid gland is in the neck on the ventral side of the pharynx in all vertebrates?…
DEFINITIONS AND KEY POINTS FOR OBJECTIVES
saadiaDEFINITIONS AND KEY POINTS FOR OBJECTIVES OF PHYLUM ARTHROPODS DEFINITIONS AND KEY POINTS FOR OBJECTIVES TERMS DEFINITIONS Schizocoelous coelom The coelom thrilled by the splitting of mesoderm is call Schizocoelous…
FURTHER PHYLOGENETIC CONSIDERATIONS
FURTHER PHYLOGENETIC CONSIDERATIONS The arthropods are very successful animals. They have diverse body forms. The lifestyles copepods, crabs, lobsters, crayfish, and barnacles demonstrate adaptive radiation. Few aquatic environments are without…
SUBPHYLUM CRUSTACEA (erustacea, hard shelled)
SUBPHYLUM CRUSTACEA (erustacea, hard shelled) The familiar members of the subphylum Crustacea are crayfish, shrimp, lobsters and crabs. Many others are lesser known but very common taxa. These include copepods,…
Answer to the Questions of the Endocrine System and Chemical Messengers
Answer to the Questions of the Endocrine System and Chemical Messengers 0.14. Describe briefly the endocrine system in Arthropods. Endocrine system in Arthropods All groups of arthropods have extensive endocrine…
SUBPHYLUM CHELICERATA (chele, claw + ata, plural suffix)
SUBPHYLUM CHELICERATA (chele, claw + ata, plural suffix) The Chelicerata includes familiar animals like spiders, mites. and ticks. It also includes less familiar animals like horseshoe crabs and sea spiders.…
SUBPHYLUM TRILOBITOMORPHA (Tri, three + lobes, lobes)
SUBPHYLUM TRILOBITOMORPHA (Tri, three + lobes, lobes) Members of the subphylum Trilobitomorpha were dominant in the oceans from the Cambrian period (600 million years ago) to the Carboniferous period (345…
CLASSIFICATION
CLASSIFICATION Phylum Arthropoda 1. They show metamerism. It is modified by the specialization of body regions for specific functions (tagmatization). 2. Chitinous exoskeleton provides support and protection. It is modified…
METAMORPHOSIS
METAMORPHOSIS The radical change in body form and physiology from immature larval stage to adult is called metamorphosis. It is third most important characteristic of the arthropods. Metamorphosis reduces competition…
Exoskeleton – Composition , Modification & Molting
THE EXOSKELETON Arthropods have an external jointed skeleton. it is composed of cuticle. Exoskeleton encloses the arthropods. The exoskeleton is major reason or the success of arthropods. Exoskeleton performs following…