The 43-year-old outclassed the rest of the field with a time of 1hr 48min 29sec.

Morelli crossed the line 22 seconds ahead of nearest challenger Hannah Macdougall of Australia, who finished second in 1:48:51.

Katell Alencon of France was the recipient of the bronze medal.

Double Paralympic medallist Katie-George Dunlevy and guide Eve McCrystal claimed gold in the women's B classification in 2:05:15.

Dunlevy, who won the time trial title and earned silver in the road race at the 2016 Paralympic Games in Rio de Janeiro, were more than a minute faster than Britain's Lora Fachie and Corrine Hall.

New Zealand's Emma Foy and Hannah van Kempen took bronze.

Paralympic gold medallist Tristan Bangma and guide Patrick Bos clinched the men's B honours, stopping the clock at 2:23.00.

Their time was just enough to beat Poland's Marcin Polak and Michal Ladosz, who were forced to settle for silver.

Vincent Ter Schure and Timo Fransen added another medal for the Dutch team by sealing bronze.