Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Coxal Glands
There is a pair of coxal glands, in almost all the segments in Onychophora (Peripatus). Developmentally; in every segment a hollow follicle or somite arises and in the trunk region, they become divided in dorsal and ventrolateral portions. The ventrolateral portion grows into the appendages and its cavity makes the end sac of the coxal gland. The end sac opens by a ciliated canal, the coelomostome, into acoiled excretory canal. The terminal portion of the canal is enlarged to form a vesicle or bladder. So the coxal glands are derived from coelomoducts. In arthropods there is a likeness in the formation of coxal glands from coelomoducts and the creation of gonads and their ducts.
In crustaceans they are found in third and sixth segments and they are suitably. named depending upon the site of their opening to outside. The one located at the base of the third segment opens at the base of the antenna, therefore called antennal gland. The one located in the sixth segment opens at the base of the second maxilla, and is termed as maxillary gland. Antennal gland is present in the larval forms of Ostracoda, Copepoda, Branchiopoda, Branchiura, Cirripedia and lower Malacostraca but TP the adults of these groups have maxillary glands. The adult amphipod and decapod crustaceans comprise antennal glands. Mysidacea, a primitive group of crustaceans have both of the antennal and maxillary glands functional. Most arachnids have a pair of coxal glands opening in the sixth segment, opening at the base of third pair of walking legs. In Limulus, there are four pairs of coxal glands.
Explain in brief Chitinous? A structure which is composed of chitin, a complex carbohydrate composed of linearly arranged Nacetyl-glucosamine units. Chitin is a characteristic
explain excretory system of prawn?
Economic Status Economic Status : It is one of the important practical considerations to be kept in mind while formulating a diet prescription. During an acute illness, a
Q. What is Osmotic Pressure? Ans. Important characteristic of a cell is 'osmosis'. You would recall reading about osmosis in the Applied Physiology Course in Unit 8. I
Over the past decade, the conceptual understanding of heart failure has changed significantly. Several large clinical trials have demonstrated that non-pharmacological and pharmaco
I nfectious bronchitis (IB) Infectious bronchitis is a highly contagious respiratory disease of poultry, caused by a virus belonging to the family Coronaviridae. Its existence
Which of the following is true for active hyperemia, a local control mechanism within the circulatory system? A. There will be a decrease in force developed by smooth muscles s
Some amount of energy is generatred from the oxidation of food materials is released as heat. This can be proved by germinating seeds. Aim: To show that heat is liberated during re
Adverse Effects of Famciclovir Famciclovir has been generally well tolerated. Headache, nausea and diarrhea have been reported. Like acyclovir, famciclovir has been associated
What are the main interspecific ecological interactions? The major harmonious interspecific ecological interactions are: protocooperation, mutualism and commensalism. The major
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd