Accessory glands or glandular parts of the oviducts produce a variety of substances for sperm maintenance, transport, and fertilization, as well as for protection of eggs. Some insects bear a sclerite in the pleural area called a laterotergite. Arthropods crab spider scorpion beetle insect butterfly Cephalopods octopus Cnidaria sea anemone jellyfish coral Echinoderms Gastropods apophallation love dart Sponge Worms earthworm penis fencing. Their reproductive systems are made up of a pair of ovaries , accessory glands, one or more spermathecae , and ducts connecting these parts. These vesicles are derived from the coxal and trochanteral endites inner annulated lobes of the ancestral abdominal appendages. The orthopteran family Acrididae has 11 segments, and a fossil specimen of Zoraptera has a segmented abdomen.
Maya. Age: 31.
Production of eggs by panoistic ovaries tends to be slower than that by meroistic ovaries.
Miya. Age: 22.
The terminal portion of the ejaculatory duct may be sclerotized to form the intromittent organ , the aedeagus. The number of eggs that the insect is able to make varies according to the number of ovarioles, with the rate at which eggs develop being also influenced by ovariole design. However, apterygotes bristletails and silverfish and many immature aquatic insects have abdominal appendages. The remainder of the male reproductive system is derived from embryonic mesoderm, except for the germ cells, or spermatogonia , which descend from the primordial pole cells very early during embryogenesis. Each segment of the abdomen is represented by a sclerotized tergum, sternum, and perhaps a pleurite.