Taxonomic applications of the esophageal flapper valve in the Genus Neonesidea (Bairdioidea, Podocopida, Ostracoda), including descriptions of new and poorly known species from the Caribbean and Gulf of Mexico Author Maddocks, Rosalie F. text Zootaxa 2021 2021-01-11 4903 4 451 492 journal article 8977 10.11646/zootaxa.4903.4.1 ec5ab0d0-05d0-493b-9359-2fbe1265656f 1175-5326 4431228 D8AA9035-EB27-4F50-9246-B5450D71F3E2 Neonesidea holdeni Maddocks, 2013 ( Figure 1 M–R) 2013 Neonesidea holdeni sp nov. Maddocks: 489, Figs. 2 , 24–27. Material: One adult male (3908M). Dimensions: Male specimen 3908M, L 0.786 mm , H 0.375 mm . Supplemental Description: Plate wedge-shaped with approximately straight, rapidly converging lateral edges. The posterior edge has a narrow medial gap, on either side of which is a row of about five closely spaced, broad, lathe-shaped teeth with triangular to beveled terminations, of which the first four are about the same size, and the fifth is only slightly smaller. The corner teeth are broad and compound but not multicuspate. Distribution: French Frigate Shoals, the Hawaiian Islands. Remarks: Early instars of many bairdiid species have a similar appearance, pinched and angulate with exaggerated pilosity, and these characteristics are seen here in an adult. The plumose caudal setae and triangular terminal spine are well developed, but the carapace lacks the posteroventral denticles and frills. The esophageal plate, with its bilateral array of five nearly equal-sized teeth with angulate terminations, is unlike any other species of Neonesidea . The species does not fit well into any of the three informal species-groups suggested by Maddocks (1969) .