The incumbent Riverhead Town supervisor -- who did not receive his party's backing -- appears to have been ousted from the GOP ballot Thursday night by a fellow council member in a tight primary race.

Jodi A. Giglio, the town councilwoman whom the Riverhead GOP endorsed, defeated Supervisor Sean M. Walter at the polls. Riverhead GOP chairman Mason Haas said more than 100 absentee ballots need to be counted.

Still, Giglio thanked supporters at Digger's Irish Pub & Restaurant in Riverhead.

"We worked hard," she said. "We had the committee by our side . . . It was a tough race. I'm happy to say tonight that I am on top."

Walter has said that if he lost the primary, he would run on the Conservative Party line in the general election. He could not be reached for comment Thursday night.

Suffolk GOP chairman John Jay LaValle, who supported Giglio in the primary, urged unity among Riverhead Republicans after a bitter primary.

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"We've got to reach across our own party," LaValle said. " . . . If we want to win in November, we have to unite."

Also in Riverhead town, four-term Republican incumbent James M. Wooten lost his party's backing this year, but he and Timothy C. Hubbard defeated Robert M. Peeker for two Town Council spots in a Republican primary.

Republican Lori M. Hulse won the Republican, Conservative and Independence primaries for Riverhead Town justice, defeating fellow Republican Robert F. Kozakiewicz, who also ran on the Conservative line, and Jeanmarie Costello, who ran on the Independence and Conservative lines.

In Islip, five candidates backed by the Islip Town Democratic Committee, led by Thomas Licari, defeated an insurgent group also running on the Democratic line led by Ricardo Montano, a former Suffolk County legislator. Licari, of Kismet, defeated Montano, of Brentwood, for the Democratic line for town supervisor.

Astrid Fidelia defeated Jorge C. Guadron in a primary for Islip Town clerk, while Maxima G. Castro beat Nitza J. Francoa in a primary for town receiver of taxes. Joseph McDermott and Christopher B. Pulitano defeated Miriam Ventura and Donovan G. Currey in a primary for two open Islip council seats.

Some races were very close and could be affected by absentee ballots.

In other Suffolk primaries:

Family Court -- Martha L. Luft and Matthew G. Hughes defeated George F. Harkin Jr. for two spots in a Green Party primary.

East Hampton Town Council -- Peter K. Van Scoyoc and Lisa M. Larsen defeated Sylvia W. Overby for two spots in an Independence Party primary.

Huntington Town Council -- Keith M. Barrett and Susan A. Berland defeated Richard R. Hall, Charles Marino and Valerie Stringfellow for two spots in a Working Families Party primary.

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District Court (5th District, Islip) -- Robert L. Cicale, John Schettino and Anthony S. Senft defeated William G. Ford for three spots in a Green primary.

Smithtown Town Council -- Lisa M. Inzerillo and Edward R. Wehrheim defeated Robert J. Creighton for two spots in a Republican primary.

Southampton Town Council -- Julie R. Lofstad and John V. Bouvier defeated Christine P. Scalera for two seats in an Independence primary.

Southampton Town Justice -- Gary J. Weber defeated Adam B. Grossman in the Independence primary, and the two were tied in the Working Families primary.

Southold Town Justice -- William C. Goggins defeated Eileen A. Powers in a Republican primary, and Goggins also defeated Powers and Brian J. Hughes in the Conservative primary. Powers defeated Goggins and Hughes on the Independence line.