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The eggs are planktonic, or attached to algae, and hatch into miniature versions of the adult, without a well-defined larval stage.
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eggs and are
Simultaneously, males or drones are produced, mostly from the unfertilized eggs of workers, although a few may be produced by the queen.
Reptiles, birds and mammals are amniotes, the eggs of which are either laid or carried by the female and are surrounded by several membranes, some of which are impervious.
In salamandrids, the male deposits a bundle of sperm, the spermatophore, and the female picks it up and inserts it into her cloaca where the sperm is stored until the eggs are laid.
Despite this, the eggs are laid singly, a behaviour not conducive for external fertilisation.
The females arrive sporadically, mate selection takes place and eggs are laid.
In typical amphibian development, eggs are laid in water and larvae are adapted to an aquatic lifestyle.
This also happens in salamander eggs even when they are unfertilised.
These penetrate the jelly envelope after the eggs are laid and may increase the supply of oxygen to the embryo through photosynthesis.
In terrestrial caecilians, the eggs are laid in grape-like clusters in burrows near streams.
First a raft is built first, then eggs are laid in the centre, and then a foam cap is placed.
The eggs of amphibians are typically laid in water and hatch into free-living larvae that complete their development in water and later transform into either aquatic or terrestrial adults.
Many caecilians and some other amphibians lay their eggs on land, and the newly hatched larvae wriggle or are transported to water bodies.
The eggs are retained in or on the parent's body but the larvae subsist on the yolks of their eggs and receive no nourishment from the adult.
Lungless salamanders in the family Plethodontidae are terrestrial and lay a small number of unpigmented eggs in a cluster among damp leaf litter.
Its eggs are laid on the forest floor and when they hatch, the tadpoles are carried one by one on the back of an adult to a suitable water-filled crevice such as the axil of a leaf or the rosette of a bromeliad.
The female visits the nursery sites regularly and deposits unfertilised eggs in the water which are consumed by the tadpoles.
A number of causes are believed to be involved, including habitat destruction and modification, over-exploitation, pollution, introduced species, climate change, endocrine-disrupting pollutants, destruction of the ozone layer ( ultraviolet radiation has shown to be especially damaging to the skin, eyes, and eggs of amphibians ), and diseases like chytridiomycosis.
They are also known to feed on other insects, larvae, and eggs, and occasionally small mammals and birds.
The abalone shell has a series of holes near the anterior margin, that are respiratory apertures for the venting of water from the gills and for releasing sperm and eggs into the water column at the appropriate time.
eggs and planktonic
The ammonoids utilized a planktonic strategy of reproduction ( numerous eggs and planktonic larvae ), which would have been devastated by the K – Pg extinction event.
They produce large quantities of eggs and their larvae are planktonic, generally at the mercy of ocean currents until they are ready to settle into adult populations.
The eggs float freely with the currents until hatching, a high number falling victim to planktonic feeders.
Labroids typically exhibit broadcast spawning, releasing high amounts of planktonic eggs, which are broadcast by tidal currents ; adult labroids have no interaction with offspring.
The eggs of M. membranipora develop into planktonic cyphonautic larvae which is strongly triangular in outline and about 850μm x 600μm big.
After 10 – 12 hours, the eggs hatch into nauplius larvae, which are long, planktonic and unable to feed.
Mating occurs in the summer, producing eggs which are carried by the females for up to a year before hatching into planktonic larvae.
The fertilized eggs which are said to be 2. 0 to 2. 5 mm, ( and later larvae ) are planktonic, rising to around to develop, with the young fish eventually descending to deeper waters as they mature.
The fertilized eggs are buoyant and planktonic ; the larvae and juveniles drift with the currents — likely at much shallower depths than the adults — and upon metamorphosis into adult form they descend to deeper waters.
After hatching out of their eggs, young slipper lobsters pass through around ten instars as phyllosoma larvae — leaf-like, planktonic zoeae.
The fertilized eggs ( and later the larvae ) are planktonic, floating with the currents until the larvae develop the strength to determine their own way.
As oviparous pelagic spawners, ridgeheads produce many tiny eggs which are fertilized externally ; the eggs and larvae ( and early juveniles ) are buoyant and planktonic, drifting with the currents near the surface until the juveniles have reached the point where they are strong enough to determine their own direction.
In most species, the eggs hatch into planktonic larvae with elongated bodies covered in cilia.
The eggs are generally planktonic, and hatch fairly quickly ( 24 to 36 hours ) ( Lake, 1967 ; Rowland, 1996 ).
eggs and attached
Smelt is also served in Dim sum restaurants deep fried with the heads and tails attached as Duō luǎn yú ( 多卵魚 ), which loosely translates as " fish with many eggs.
Some other species, for example members of the genus Mansonia, lay their eggs in arrays, attached usually to the under-surfaces of waterlily pads.
Their close relatives, the genus Coquillettidia, lay their eggs similarly, but not attached to plants.
Most decapods carry the eggs attached to the pleopods, while peracarids, notostracans, anostracans, and many isopods form a brood pouch from the carapace and thoracic limbs.
Most leptostracans and krill carry the eggs between their thoracic limbs ; some copepods carry their eggs in special thin-walled sacs, while others have them attached together in long, tangled strings.
Guinea pigs may also suffer from " running lice " ( Gliricola porcelli ), a small white insect which can be seen moving through the hair ; the eggs of these lice, which appear as black or white specks attached to the hair, are sometimes referred to as " static lice ".
The female carries the fertilized eggs in a brood pouch attached to her abdomen, and the young ride on the mother for a short time after they hatch.
Several other species carry their eggs attached to the body between their pelvic fins.
Some of the eggs were emptied, and a bird ’ s head made of wax or dough and wings and tail-feathers of folded paper were attached.
Generally Gyrinids lay their eggs under water, attached to water plants, typically in rows.
The eggs rapidly develop into embryos, but these remain attached to the side of the nest until the age of about three to four weeks.
Takifugu rubripes, for example, breeds from March to May and lays eggs attached to rocks at a depth of around 20m.
In most ostracods, eggs are either laid directly into the water as plankton, or are attached to vegetation or the substratum.
Eggs are deposited on animal skin directly, or the larvae hatch and drop from the eggs attached to the intermediate vector: the body heat of the host animal induces hatching upon contact or immediate proximity.
Swimming sperm fertilize eggs contained in archegonia that remain attached to the female gametophyte.
In a few days, the eggs hatch and the fry remain attached to the spawning substrate.
When the eggs hatch the young toadfish stay attached to the yolk for some time.
The female carries the eggs for up to 12 months, depending on the temperature, attached to her pleopods.
The eggs are enclosed in a long, gelatinous mass, which is attached to the substrate with a short stalk.
Their eggs are deposited in round or oval jellylike strings, attached to eelgrass or sand.
The female extrudes the eggs from her body several months later ; however, they remain attached under her abdomen for three to five months until they hatch.
The egg masses consist of several hundred eggs, approximately 3. 5 mm each, attached to vegetation at the bottom of rivers.
In females, the first one or two pairs are missing, while the remaining pairs are uniramous, and have long setae, to which the eggs can be attached.
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