Eck's A Hart Breaker
But there is no place for unarguably Aberdeen's best player this season Michael Hart in the total of 47 players chosen by former Don McLeish.
Big Eck included Anderson and Severin in a very familiar-looking 30-man squad for a get-together in Ayrshire next week.
Meanwhile, Clark and Mackie are listed in a 19-man squad for the game between Scotland B and Finland B on Wednesday 7 February in the Tennent's B International at Rugby Park, Kilmarnock.
Mackie told RedWeb: "I am delighted to be involved in the Scotland B Squad.
"It's a double celebration for me today as I signed my new contract [click here] and was just told about the call up when I got back from training.
"I am going to do my best to impress whilst with the squad and hopefully I will have more involvement with the national squads."