Sauropods in general don't get the love they should on Terrible Lizards because, well, Dave doesn't know that much about them (and everyone knows theropods are best anyways). However, there's more than a couple that are both well-known enough in general and Dave know a bit about them that we can talk for a decent amount of time. Step forward the long-neckiest of the long-necked sauropods, Mamenchisaurus. This odd (even by sauropod standards) animal is found in a number of different sites from the Middle Jurassic of China but has not had all the research attention that it should for a such an interesting animal that's known from a good amount of material and a time where dinosaur remains are generally sparse. Happily, a major new study is out on these animals which adds some nice new information and potentially resolves some longstanding issues with this awesome genus so buckle up for some important tales of neck elongation in the Mesozoic.

Links:

A very short blogpost by Dave with a photo of the mounted Bellusaurs skeleton: https://archosaurmusings.wordpress.com/2010/01/16/bellusaurus/

And a post on the insanely long Mamenchisaurus sinocanadorum cervical rib: https://archosaurmusings.wordpress.com/2008/06/27/biggest-bones/