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The Pacific lamprey (Entosphenus tridentatus) is an anadromous parasitic lamprey from the Pacific Coast of North America and Asia in an area called the Pacific Rim. [4] It is a member of the Petromyzontidae family. The Pacific lamprey is also known as the three-tooth lamprey and tridentate lamprey. Ammocoetes held by biologist in the Carmel River
Lampetra ayresii is a species of lamprey in the family Petromyzontidae.It is also called the river lamprey or western river lamprey.It is found in the eastern Pacific, specifically from Tee Harbor, Juneau in Alaska to the Sacramento–San Joaquin drainage in California, USA.
Lampetra is a genus of lampreys in the family Petromyzontidae.. Phylogenetic studies indicate that this genus as presently defined is polyphyletic, with species of this genus from western North America forming a clade that forms the sister group to Lethenteron, Eudontomyzon, and Lampetra sensu stricto (eastern North American and European species).
2 Life cycle. 3 References. Toggle the table of contents. ... Lethenteron appendix, the American brook lamprey, is a common non-parasitic lamprey in North America. [4]
As with all lamprey species, the least brook lamprey spends the majority of its life as a worm-like ammocoete. The ammocoete (5 mm–20 cm) is clear with a pigmented head when small (<5 cm), but becomes a dark/golden brown as it matures. Ammocoetes have pigmented eye spots located in the head that can detect light and dark.
Plant embryonic development, also plant embryogenesis, is a process that occurs after the fertilization of an ovule to produce a fully developed plant embryo. This is a pertinent stage in the plant life cycle that is followed by dormancy and germination . [ 1 ]
During the egg stage of the lamprey's life, it is vulnerable to predators that prefer to eat fish eggs. [5] Predation by other fish helps keep lamprey numbers under control. When the lamprey has hatched from its egg into the larvae stage, it is limited to pools or backwater areas with a sand or sandy mud bottom. [6]
Diagram showing the alternation of generations between a diploid sporophyte (bottom) and a haploid gametophyte (top) A sporophyte (/ ˈ s p ɔːr. ə ˌ f aɪ t /) is the diploid multicellular stage in the life cycle of a plant or alga which produces asexual spores. This stage alternates with a multicellular haploid gametophyte phase.