Ancyracanthopsis winegardi n.sp. (Nematoda: Acuarioidea) from Pluvialis squatarola (Aves: Charadriidae) and Ancyracanthus heardi n.sp. from Rallus longirostris (Aves: Rallidae), and a review of the genus

Abstract

Ancyracanthopsis winegardi n.sp. from under the koilin lining of the gizzard of Pluvialis squatarola (L.) can be distinguished by its ptilina which extend from the dorsoventral sides of the oral opening to the lateral sides; each ptilinum is divided into four lobes. In addition, the left spicule has a narrow process forming a truncated distal end and the right spicule has a conical protuberance on the left side near the distal end. Evidence is presented that fiddler crabs (Uca spp.) may serve as intermediate hosts of A. winegardi in the Gulf coast. Ancyracanthopsis heardi n.sp. from under the koilin lining of the gizzard of Rallus longirostris Boddaert can be distinguished by its ptilina which extend from the dorsoventral sides of the oral opening to the lateral sides; each ptilinum is divided into five or six serrations. In addition, the distal end of the left spicule is flat and expanded dorsally, and the right spicule is crescent-shaped and markedly tapered. Ancyracanthopsis now comprises eight known species, four occurring in the New World (i.e., A. coronata (Molin, 1860a); A. quadripartita (Clapham, 1945); A. winegardi n.sp.; A. heardi n.sp.), three in the Old World (i.e., A. parvialatus (Belopolskaya, 1953); A. petrovi Guschanskaya, 1950; A. schikhobalovi (Guschanskaya, 1950)), and one in Asia (A. buckleyi Ali, 1971).