egg sac


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egg sac

n.
The silken pouch in which many spiders deposit their eggs. Also called egg case.
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This provided basic biology information that benefitted research involving insecticide bioassays on brown widow egg sacs (Vetter et al, in prep); knowing the phenology of seasonal clutch size helped determine whether lab-produced egg sacs would be temporally comparable with natural oviposition and, hence, whether pesticides tested on egg sacs would have real world relevance.
That is, dense infestations full of poor-condition females producing small egg sacs and low-condition eggs may be soon to experience a population decline.
For egg sac 1, we observed abundant exuvia in the silk net on May 14th, indicating the occurrence of the spiderlings' first molt.
6) adult females and their egg sac did not significantly affect the latency to the first terminal exhibiting feeding symptoms (F = 2.
It now has five egg sacs, each containing 500 to 750 eggs," he said.
In rainbow trout, spawning through the egg sac nutrition period spans 60 to 70 days.
punctulata were brought into the lab prior to egg sac construction, were placed in containers and monitored for burrow construction.
A few days later she found a dead spider and an empty egg sac on them and soon afterwards she started finding the tiny, fast-moving creatures on her curtains and walls.
Emma said: 'One egg sac can produce up to 400 spiders.
There may always be an egg sac waiting to release an egg.
The female hunting spiders, such as the wolf spider, carry a large egg sac around under their abdomen wherever they go and, once hatched, the young cling on and are carried everywhere for weeks, operating nocturnally, they hunt crawling insects relying on their own speed and size to gain their prey.
3B, where the proembryo was multicellular and the endosperm nuclei multiplied and were more or less evenly spaced in the egg sac extending from the proembryo to the hypostase.