Today it would be very easy to say "wait a week or so and you can read my thesis" but it is not expressly about Trinacromerum and would not fit the criteria of news about a specific taxa. Instead, for Trinacromerum it is actually quite highly recommended to go back to the earliest records and the most extensive descriptions are from the late 19th Century and early 20th Century. My solid recommendations are S. W. Williston's 1908 edition of North American Plesiosaurs: Trinacromerum and the 1888 edition of The American Geologist featuring Cragin's Preliminary Description Of A New Or Little Known Saurian From The Benton Of Kansas. Read and enjoy. I certainly did!