I've attached a summary that I put together in 2022 of the Dragonflies of Mallorca, based on an internet literature search and my own observations of 20+ years visiting the Island. I'm in the process of updating it, but there are rather a lot of distractions which are slowing progress..
A really good dragonfly source is the report on Balearic dragonflies in 2019, appearing in the Winter 2020 edition of Es Busquaret, authored by Marina Tysoe and Maties Rebassa. It's in Catalan but as it shows scientific names it's pretty accessible if (like me) your Catalan is non-existant. In addition to 2019 records they show previous records, so it's as complete a list as you're likely to get. Here's the link:
Es Busqueret 50
www.gobmallorca.com
Bird Forum users here have a very wide interest in natural history, so it would be great if members posted dragonfly and butterfly records as well as bird records here.
Stew