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The lined seahorse (Hippocampus erectus), northern seahorse or spotted seahorse, is a species of fish that belongs to the family Syngnathidae. [ 3 ] [ 4 ] H. erectus is a diurnal species with an approximate length of 15 cm (5.9 inches) and lifespan of one to four years.
Seahorses range in size from 1.5 to 35 cm (0.6 to 13.8 in). [13] They are named for their equine appearance, with bent necks and long snouted heads and a distinctive trunk and tail. Although they are bony fish, they do not have scales, but rather thin skin stretched over a series of bony plates, which are arranged in rings throughout their bodies.
Male seahorses have a specialized ventral brood pouch to carry the embryos, male sea dragons attach the eggs to their tails, and male pipefish may do either, depending on their species. [4] The most fundamental difference between the different lineages of the family Syngnathidae is the location of male brood pouch. [5]
The long-snouted seahorse is a small-sized fish that can reach a maximum length of 21.5 cm (8 + 1 ⁄ 2 in), but the average size is more or less 12 cm (5 in). [5] [6] The body is slender, the snout is long and the tail is prehensile.
The Syngnathiformes / ˈ s ɪ ŋ (ɡ) n ə θ ɪ f ɔːr m iː z / are an order of ray-finned fishes that includes the leafy seadragons, sea moths, trumpetfishes and seahorses, among others. [2] These fishes have generally elongate, narrow bodies surrounded by a series of bony rings, with small, tubular mouths.
The dwarf seahorse only reaches up to 2 inches (51 mm) in length and is not an aggressive feeder. Therefore, it is typically kept in small aquariums (5 to 10 US gallons (19 to 38 L)). The dwarf seahorse can be fed brine shrimp nauplii, although it will also eat copepods and other shrimp larvae. Because of its short digestive tract, food must be ...
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Pygmy seahorses have a single gill opening on the back of the head (instead of two on the sides as in normal seahorses), and the males brood their young inside their trunk, instead of in a pouch on the tail. [11] A molecular phylogeny confirms that the pygmy seahorses are a monophyletic sister lineage of all other seahorses. [10]