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Spiral holoblastic cleavage is characteristic of several animal groups, including annelid worms, some flatworms, and most mollusc's. It differs from radial cleavage in numerous ways. First, the cleavage planes are not parallel or perpendicular to the animal-vegetal axis of the egg; rather, cleavage is at oblique angles, forming a "spiral" arrangement of daughter blastomeres. Second, the cells touch one another at more places than do those of radially cleaving embryos. In fact, they assume the most thermodynamically stable packing orientation, much like that of adjacent soap bubbles. Third, spirally cleaving embryos usually undergo fewer divisions before they begin gastrulation, making it possible to follow the fate of each cell of the blastula. When the fates of the individual blastomeres from annelid, flatworm, and mollusc embryos were compared, many of the same cells were seen in the same places, and their general fates were identical Blastulae produced by radial cleavage have no blastocoel and are called stereoblastulae.
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What is sporocyst larva of fasciola hepatica?
A sporocyst is an elongated sac that protects immature larva of trematodes until they are ready to 'hatch.' Fasciola hepatica is a common liver fluke. Eggs are released into water where they hatch. The resulting hatching miracidia then find a snail host. Sporocysts are then formed and matured in the snail's digestive gland until the cercariae hatch and leave the snail.
Does snail give birth?
Japanese trapdoor snails give birth to live young.
How long does it take for snail eggs to hatch?
Female squid lay eggs only once in their lifetime. They lay many eggs at one time at die shortly afterwards. Two weeks later, the squid eggs will begin to hatch and a new life cycle will begin.
How many eggs do apple snails usually lay?
About 85 each time, for a total of around 430is the number of eggs that a garden snail lays.Specifically, the data are for the brown garden snail (Helix aspersa Miller). Egg-laying generally can take place every six weeks between February and October. That means about five egg-laying times, each involving about 85 eggs, under optimum circumstances of humid temperatures above 53.6
How long does it take for a snail to travel 1 foot?
it depends on the snail and its experience. if it is a racing snail, he'll be faster than an ordinary snail.
What is the colour of snail eggs?
- Most snail eggs are clear, but not all of them are.
What are snail eggs called?
I've only ever heard them called "Snail Eggs".
Pictures of snail eggs?
Look at the link below these are Golden Apple Snail eggs.
Snail eggs what do they look like?
well snail eggs are pretty tiny. you can hardly see them, they are round and white. DeeDazzle : )
What is the difference between fish eggs and snail eggs?
A fish egg has baby fish in it, a snail egg has baby snails in it!
How many eggs can a snail have at once?
3 weeks on average. You can watch them develop in the egg sacs, and emerge when fully formed.
Will snail eggs still hatch if the mother or father snail is smashed?
Yes.
Who lays most eggs?
snail
How do you get your snail to give birth?
You don't. After the snails have mated the snail will go under the soil and lay eggs. The eggs will hatch after about 3 weeks.
Do snail eggs hatch under water?
no
If a snail lays eggs will the snail die?
I don't think so, but check out the link for yourself.
How do snail ensure their survival of species?
They reproduce. Snails are hermaphrodites and when they mate each snail exchanges genetic material with the other snail. After mating each snail will lay eggs.
