Ryder was the second victim of a Kieran Noema-Barnett hat-trick, the others being Neil Broom and Nathan McCullum as.
At lunch, Otago had recovered from 20 for 4 to be 103 for 4.
Central Districts batsman Jamie How earlier struck 207 - his maiden double ton in first class cricket.
Meanwhile, Auckland's 49/2, chasing a further 312 runs to beat Canterbury in their match in Christchurch.
The match between Northern Districts and Wellington in the capital has been declared a draw after only 50.4 overs were possible in the match.