HD-4 or Hydrodome number 4 was an early research hydrofoil watercraft developed by the scientist Alexander Graham Bell. It was designed and built at the Bell Boatyard on Bell's Beinn Bhreagh estate near Baddeck, Nova Scotia. In 1919, it set a world marine speed record of 70.86 miles per hour (114.04 km/h).
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{"type":"standard","title":"Pleistoannelida","displaytitle":"Pleistoannelida","namespace":{"id":0,"text":""},"wikibase_item":"Q115868988","titles":{"canonical":"Pleistoannelida","normalized":"Pleistoannelida","display":"Pleistoannelida"},"pageid":72482181,"thumbnail":{"source":"https://upload.wikimedia.org/wikipedia/commons/thumb/a/a4/Bispira_sp._%28Tubeworm%29.jpg/330px-Bispira_sp._%28Tubeworm%29.jpg","width":320,"height":240},"originalimage":{"source":"https://upload.wikimedia.org/wikipedia/commons/a/a4/Bispira_sp._%28Tubeworm%29.jpg","width":2000,"height":1500},"lang":"en","dir":"ltr","revision":"1278943613","tid":"7bfaf6a7-f9da-11ef-9efa-6fa2946a7aec","timestamp":"2025-03-05T15:57:05Z","description":"Clade of annelid worms","description_source":"local","content_urls":{"desktop":{"page":"https://en.wikipedia.org/wiki/Pleistoannelida","revisions":"https://en.wikipedia.org/wiki/Pleistoannelida?action=history","edit":"https://en.wikipedia.org/wiki/Pleistoannelida?action=edit","talk":"https://en.wikipedia.org/wiki/Talk:Pleistoannelida"},"mobile":{"page":"https://en.m.wikipedia.org/wiki/Pleistoannelida","revisions":"https://en.m.wikipedia.org/wiki/Special:History/Pleistoannelida","edit":"https://en.m.wikipedia.org/wiki/Pleistoannelida?action=edit","talk":"https://en.m.wikipedia.org/wiki/Talk:Pleistoannelida"}},"extract":"Pleistoannelida is a group of annelid worms that comprises the vast majority of the diversity in phylum Annelida. Discovered through phylogenetic analyses, it is the largest clade of annelids, comprised by the last common ancestor of the highly diverse sister groups Errantia and Sedentaria and all the descendants of that ancestor. Most groups in the clade find their ancestors within the Cambrian explosion when Annelid diversity expanded dramatically. The Pleistoannelida clade covers a variety of traits. However, the evolution of simple to complex eyes, developed papillae for burrowing, and for some specialized radioles for feeding can be seen universally across every species. New findings have discovered the range of Annelid diversity have led to uncertainty if groups with developed ancestral traits should remain within the clade. Furthermore, there's been a lack of recently discovered Annelid traits being used in the categorization of groups within the clade, leading to many hypotheses on how to do so and which should remain within the clade. Currently three smaller clades that were originally a part of the groups Errantia and Sedentaria have been proven to fall outside while still being connected to the basal groups.","extract_html":"
Pleistoannelida is a group of annelid worms that comprises the vast majority of the diversity in phylum Annelida. Discovered through phylogenetic analyses, it is the largest clade of annelids, comprised by the last common ancestor of the highly diverse sister groups Errantia and Sedentaria and all the descendants of that ancestor. Most groups in the clade find their ancestors within the Cambrian explosion when Annelid diversity expanded dramatically. The Pleistoannelida clade covers a variety of traits. However, the evolution of simple to complex eyes, developed papillae for burrowing, and for some specialized radioles for feeding can be seen universally across every species. New findings have discovered the range of Annelid diversity have led to uncertainty if groups with developed ancestral traits should remain within the clade. Furthermore, there's been a lack of recently discovered Annelid traits being used in the categorization of groups within the clade, leading to many hypotheses on how to do so and which should remain within the clade. Currently three smaller clades that were originally a part of the groups Errantia and Sedentaria have been proven to fall outside while still being connected to the basal groups.
"}