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Pomacea bridgesii, common name the spike-topped apple snail or mystery snail, is a South American species of freshwater snail with gills and an operculum, an aquatic gastropod mollusk in the family Ampullariidae. These snails were most likely introduced to the United States through the aquarium trade.
A color breed refers to groupings of horses whose registration is based primarily on their coat color, regardless of the horse's actual breed or breed type. Some color breeds only register horses with a desired coat color if they also meet specific pedigree criteria, others register animals based solely on color, regardless of parentage.
The two basic pigment colors of horse hairs are pheomelanin ("red") which produces a reddish brown color, and eumelanin, which produces black. These two hair pigment genes create two base colors: chestnut, which is fully red, and black, which is fully black. All other coat colors are created by additional genes that modify these two base colors.
The apple snail's usual enemies are the birds limpkin and snail kite. Apple snails inhabit various ecosystems: ponds, swamps and rivers. Although they occasionally leave the water, they spend most of their time under water. Unlike the pulmonate snail families, apple snails are not hermaphroditic, but gonochoristic; i.e. they have separate sexes.
Pomacea diffusa was originally described as a subspecies of Pomacea bridgesii. [1] Pain (1960) [2] argued that Pomacea bridgesii bridgesii was a larger form with a restricted range, with the smaller Pomacea bridgesii diffusa being the common form throughout the Amazon Basin (Brazil, Peru, Bolivia). [1]
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In the aquarium trade these snails are sometimes called Pomacea or incorrectly Ampullarius, and in English as "[color] mystery snail" or "apple snail". Some species have been introduced outside their native range and are considered invasive because of their voracious appetite for plants.
In horses, they are associated with primitive breeds, [1] though not limited to such breeds. The markings are particularly associated with the dun coat color family. [2] All dun horses possess at least the dorsal stripe, [1] [2] [3] but the presence of the other primitive markings varies. Other common markings may include horizontal striping on ...