A "pTLD" stands for pseudo Top-Level Domains. According to the definition I found in Wikipedia, these include .bitnet, .csnet, .exit, .i2p, .local, .onion, .oz, .freene and .uucp and have no meaning in the global Domain Name System.
I am a new gTLD Consultant based in Paris. "New gTLD" stands for "new generic Top-Level Domains" from the ICANN new gTLD program. They are new domain name extensions such as ".consulting" (instead of ".com").