Causes HDN: Yes
This is another rare antibody for sure. I could only find 2 articles that even mentioned anti-Zd when searched. Because of this, I have taken the liberty of uploading my copy of the full text of article 1 below. So far this antibody/antigen combo have only been found in 1 family. Anti-Zd is a warm reacting antibody that crosses the placenta . Anti-Zd can cause HDN requiring an exchange transfusion .
1 - http://onlinelibrary.wiley.com/doi/10.1111/j.1423-0410.1970.tb01471.x/abstract
2 - http://onlinelibrary.wiley.com/doi/10.1111/j.1537-2995.1971.tb04407.x/full
Full text for article 1 can be found here.