George Boyd, Shaun Batt or Ben Wright could partner Aaron Mclean in his absence.
The match also provided useful batting practice with Ben Wright, Michael Powell and Mark Wallace scoring 50s.
Exodus Geohaghon, Sergio Torres, Ben Wright, Danny Andrew and Kwesi Appiah have been placed on the transfer list.
The Essex seamers hit back late on to take three wickets, claiming the scalps of Gibbs, Rees and Ben Wright.
The symbol has been adopted by the conservative Tea Party movement, which organised this show of opposition, the BBC's Ben Wright in Washington reports.
Posh started the game with Aaron Mclean and Ben Wright leading the line, but introduced George Boyd and Shaun Batt as the match wore on.
Maher (39), Ben Wright (39) and Croft (38) made useful contributions but no-one was able to build a sizeable partnership in the face of some tight Somerset bowling.
BBC: SPORT | Cricket | Counties | Somerset victory seals promotion
After slumping to 10-3, Glamorgan were grateful to a stand of 61 between Tom Maynard (39) and Ben Wright (22) for helping them post 116-7 from 20 overs.
BBC: Marcus Trescothick eases Somerset to win over Glamorgan
"We've got prepare as though Craig isn't going to be fit, we're going to try Shaun Batt up front again and Ben Wright has done very well, " he said.
Despite a crop of promising home-grown players - such as Maynard's own son Tom, Gareth Rees, James Harris and Ben Wright - and some astute recruiting, Glamorgan endured another lacklustre season in 2009.
Dalrymple lost both Ben Wright, caught at slip off Daggett, and Michael Powell, who was trapped in front by Hall, and then, in the final over of the day, the captain was caught at slip off Boje.
President Obama's second term work will be more of a challenge than Saturday's school work, says the BBC's Ben Wright in Washington - trying to change America's gun laws, reforming immigration and dealing with the country's debt.
Chelsea made a double switch with 17 minutes left, sending on Tal Ben Haim and Shaun Wright-Phillips for Ashley Cole and Joe Cole.
Marine Wright joined the service in November 2009, took part in navy ski championships in France, scaled Ben Nevis and had a passion for motocross.
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