Taxonomic applications of the esophageal flapper valve in Bairdoppilata and Glyptobairdia (Bairdiidae, Ostracoda), with comments on anatomy, ontogeny, and geography Author Maddocks, Rosalie F. text Zootaxa 2022 2022-08-17 5175 3 301 342 journal article 124035 10.11646/zootaxa.5175.3.1 509d2bb8-bdff-4757-b45a-5d0cbccc31b4 1175-5326 7003585 44FB9C3D-3188-4BFB-BDB8-C1324729A396 Bairdoppilata sp. 2 [of Maddocks 2015 , Hawaii ] ( Figure 16C ) 2015 Bairdoppilata sp. 2 : Maddocks, p. 304, figs. 12A–L, 13A–J. 2018 Bairdoppilata sp. 2 , Maddocks.—Maddocks: figs. 3D,H; 4A, B; 7D–G; 8A–D, L; 13A–D; 14A–G; 15A–F; 16A–C. Material Examined: Twelve specimens from Kanéohe Bay, O’ahu, the Hawaiian Islands ( Maddocks 2015 , 2018 ). Dimensions: Female 3969F, carapace L 0.892 mm , carapace H 0.566 mm . Esophageal Valve: The plate is flat, wedge-shaped, with an incised but fairly narrow chevron groove ( Fig. 16C ). The posterior perimeter is scalloped with about eight gently curved teeth or low mounds, of equal sizes with no medial gap, which are set apart by a space from the multilobate corner teeth and one or more guide pins (or setules of the underlying ventral brush). Specimens from this species population were illustrated extensively by Maddocks (2018) to show the three-dimensional configuration of the esophageal apparatus and the molting process.