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The larvae or larval stadium: some gastropods may be trochophore and/or veliger; Estivation and hibernation (each of these are present in some gastropods only) The growth of gastropods; Courtship and mating in gastropods: fertilization is internal or external according to the species. External fertilization is common in marine gastropods.
Jellyfish have a complex life cycle which includes both sexual and asexual phases, with the medusa being the sexual stage in most instances. Sperm fertilize eggs, which develop into larval planulae, become polyps, bud into ephyrae and then transform into adult medusae. In some species certain stages may be skipped. [65]
Marine larval ecology is the study of the factors influencing dispersing larvae, which many marine invertebrates and fishes have. Marine animals with a larva typically release many larvae into the water column, where the larvae develop before metamorphosing into adults.
Typically the mandibles are the largest and most robust mouthparts of a chewing insect, and it uses them to masticate (cut, tear, crush, chew) food items. Two sets of muscles move the mandibles in the coronal plane of the mouth: abductor muscles move insects' mandibles apart ( laterally ); adductor muscles bring them together ( medially ).
These pharate larvae lie sequestered within the shells of the eggs until the following spring. Henceforth, these encased larvae are the most durable of the insect's life stages. In northern areas, the pharate larvae are highly freeze-tolerant and can withstand midwinter temperatures of −40 °C (−40 °F) or lower.
The origin of the word "dobsonfly" is unclear. John Henry Comstock used the term in reference to these insects in his 1897 book Insect Life, [1] but did not explain it. He also mentioned that anglers used the word "hellgrammite" for the aquatic larvae they used as bait, but the origin of this term is also unknown.
Necator americanus is a species of hookworm (a type of helminth) commonly known as the New World hookworm.Like other hookworms, it is a member of the phylum Nematoda.It is an obligatory parasitic nematode that lives in the small intestine of human hosts. [1]
Larval Stage Planning (ラーバル ステージ プランニング) is a Japanese J-pop group formed in 2010 and is signed to Lantis. The group is also a member of the Sapporo-based music production group I've Sound .