Fishbase, the most important place for seahorse species information.
Fish Index: Sea horse facts and details. Includes basic facts, taxonomy, distribution and a photo.
Sara Lourie page, with a zoomable image of Coleman's seahorse, H. Colemani. Courtesy the Australian Museum Online.
PDF: "Scientists find smallest seahorse" CBC Newsworld (made available by Fisheries Centre, University of BC). On Sara Lourie's finding of Hippocampus denise.
Abstract: "A new pygmy seahorse ... from Lord Howe Island" by Rudie H. Kuiter, Records of the Australian Museum (2003). On the discovery of H. colemani.
The eponymous Neville Coleman's website. He also discovered "Coleman's Sea Star," "Coleman's Flatworm," "Coleman's Sea Squirt," "Coleman's Shrimp," and almost a dozen other colemanii.
Barbour's seahorse, (Hippocampus barbouri)
Photos of the yellow seahorse or Barbour's seahorse (Hippocampus barbouri) from Fish Information Services.
Big-belly seahorse, (Hippocampus abdominalis)
Big-bellied Seahorse factsheet, from the Melbourne Aquarium.
Dwarf seahorse, (Hippocampus zosterae)
Amazon. The Complete Guide to Dwarf Seahorses in the Aquarium by Alisa Wagner Abbott.
Short positive review by Marc, on Sygnathc.org: "Read it cover to cover in 2 /2 hours, couldn't put it down"
Amazon. Realm of the Pygmy Seahorse: an Underwater Photography Adventure by Constantinos Petrinos. Good reviews.
Lined, Hudson's or spotted seahorse
Animal Diversity: Hippocampus erectus (Lined seahorse/Hudson's seahorse/spotted seahorse), covering all the important bases. Animal Diversity is a University of Michigan project written by and for college students.
Lined seahorse (hippocampus erectus) by enature.com. Brief description, range and habitat details.
Beautiful hippocampus erectus photo from Jeff's Nudibranch Site and Coral Reef Gallery. Excellent site with large images of nudibrachs (sea slugs to you and me). See his frequently asked questions and stamps.
Lined seahorse photo taken at Utila, Bay Islands, Honduras.
Long Snout Seahorse, (Hippocampus reidi)
Photograph of Reid's seahorse (Hippocampus reidi).
Yellow colored long snout Seahorse (Hippocampus reidi) on a set of sea rods at night in St Croix in the US Virgin Islands photo by Kasey Canton.
Pacific seahorse, (Hippocampus ingens)
Pacific seahorse field guide from the San Diego Natural History Museum. Nice page containing descriptions, range and habitat, natural history and conservation status.
Collared seahorse (Hippocampus jugumus) from FishBase.
White's Seahorse (Hippocampus whitei), from the Australian Museum Online's "Fish in Focus."
Giraffe seahorse (Hippocampus camelopardalis) from FishBase.
Great seahorse (Hippocampus kelloggi) from FishBase.
Half-spined seahorse (Hippocampus semispinosus) from FishBase.
Hedgehog seahorse (Hippocampus spinosissimus) from FishBase.
High-crown seahorse (Hippocampus procerus) from FishBase.
Hippocampus sindonis (Dhiho's seahorse) from FishBase.
Japanese seahorse (Hippocampus mohnikei) from FishBase.
Jayakar's seahorse (Hippocampus jayakari ) from FishBase.
Lichtenstein's Seahorse (Hippocampus lichtensteinii) from FishBase.
Lined seahorse/Hudson's seahorse/Spotted seahorse (all names for the Hippocampus erectus) from FishBase. Includes a stamps section, and a sounds sections.
Longnose seahorse (Hippocampus trimaculatus) from FishBase.
Monte Bello seahorse (Hippocampus montebelloensis) from FishBase.
Narrow-bellied seahorse (Hippocampus angustus) from FishBase.
Northern spiny seahorse (Hippocampus multispinus) from FishBase.
Queensland seahorse (Hippocampus queenslandicus) from FishBase.
Réunion seahorse (Hippocampus borboniensis) from FishBase.
Sea pony (Hippocampus fuscus) from FishBase.
Short snouted seahorse (Hippocampus Hippocampus). Creature feature from the Marine Life of the Channel Islands, chosen by Pieter and Thamara Schmal.
Short-head seahorse (Hippocampus breviceps) from FishBase.
Tiger tail seahorse (Hippocampus comes) from FishBase.
West African seahorse (Hippocampus algiricus) from FishBase.
West Australian seahorse (Hippocampus subelongatus) from FishBase.
White's seahorse (Hippocampus whitei) from FishBase.
Winged seahorse (Hippocampus alatus) from FishBase.
Zebra seahorse (Hippocampus zebra) from FishBase.