Bairdoppilata scaura Maddocks, 2015

Maddocks, Rosalie F., 2022, Taxonomic applications of the esophageal flapper valve in Bairdoppilata and Glyptobairdia (Bairdiidae, Ostracoda), with comments on anatomy, ontogeny, and geography, Zootaxa 5175 (3), pp. 301-342 : 327

Bairdoppilata scaura Maddocks, 2015

( Figure 16A–B )

2015 Bairdoppilata scaura Maddocks , n. sp.: p. 298, figs. 6–11.

2018 Bairdoppilata scaura Maddocks. —Maddocks: p. 6, figs. 3B,E,G; 5H, 8P–Q, 10D.

Material Examined: Two males and one juvenile from French Frigate Shoals and Kanéohe Bay, the Hawaiian Islands .

Dimensions: Holotype male specimen 3360M, LVL 0.830 mm, LVH 0.480 mm, RVL 0.810 mm, RVH 0.430 mm . Paratype male specimen 3864M, LVL 0.810, LVH 0.490 . Paratype juvenile specimen 3359J, LVL 0.748 mm, LVH 0.420 mm .

Esophageal Valve: The plate of the holotype ( Fig. 16A ) is relatively broad with slightly curved lateral edges. The posterior perimeter bears about 10 low teeth, mounded to subconical in shape, which are largest near the midline and decrease in size toward the corners. The corner teeth are broader and multilobate. The anterolateral scroll has a hemicircular indentation and curved spine.

Another male specimen (3864M) has a plate with about 10 smaller, subconical teeth, which are all about the same size ( Maddocks, 2015, Fig. 11I ; Maddocks 2018, Figs. 8Q , 10D ). A second, inner row of approximately 10 slightly smaller teeth seems to be visible through the gaps, or these may be steps at the base of the main teeth rather than separate teeth. The corner teeth are not enlarged, and no multiple cusps can be seen through the setules of the ventral brush. The anterolateral scroll is asymmetrical on the two sides, with poorly developed indentation and broad-based spine.

A juvenile specimen (3959J) has a plate with about 12 teeth, with asymmetrically conical outlines, which increase slightly in size away from the midline ( Maddocks 2018, Fig. 5H ). Indistinct corner teeth are set apart by a gap. The anterolateral scroll has a shallow, curved indentation and broad-based spine.

The observed differences between these specimens are mentioned to show the effect of viewing perspective. The plate is naturally curled rather than flat, unless it is compressed in a dissection slide. The teeth project upward (dorsally) as well as outward (posteriorly), so that the apparent shapes of the teeth depend on the angle at which the plate is tilted. In a dissection slide that provides a dorsal view, the plate rests on the ventral bracket, and the angle of tilt depends on the amount of deformation of the bracket walls.

Figures

FIGURE 5. Bairdoppilata cushmani (Tressler), male specimen 3114M from the Bahamas, UH2371. A, plate, bracket and fragment of ring; B, brace; C, intact right hemipenis and incomplete left hemipenis; D, copulatory tube, distal element, and appendages of right hemipenis; E, copulatory tube, distal element, and appendages of left hemipenis; F, A2 distal claws; G–H, right and left valve exteriors in transmitted light, showing patch pattern, NPC, marginal sensilla, broad infold and shallow vestibules; linear tracks are probably postmortem agal or fungal borings; I–J, right and left valve exteriors in reflected light, showing patch pattern and smooth, reflective surface. Scale bar = 50 µm.

FIGURE 8. Bairdoppilata cushmani (Tressler). A–P, female specimen 2395 from Florida: A, B, left and right A2 distal claws; C, anterodorsal view of head capsule and midgut during dissection, with food ball, esophageal valve with ring, collar, belt, plate, and both braces, forehead, upper and lower lips, and sternum; D, food ball, showing spiral structure; E–F, spermatophores; G, plate, bracket, and both braces; H, posterior teeth of plate; I–J, RV and LV exteriors in transmitted light, showing patch pattern, NPC and sensilla; K–L, RV and LV exteriors in reflected light, showing patch pattern, NPC, and smooth surface; M–N, anterodorsal and posterodorsal edges of RV interior showing supplemental denticles; O–P, anterodorsal and posterodorsal edges of LV interior showing supplemental locules on infold beneath dorsal overhang. Scale bar = 50 µm.

FIGURE 10. Bairdoppilata cushmani (Tressler). A–G, female specimen 1026F from Cuba 6: A, esophageal valve with collar, plate, bracket and tuberculate ends of braces; B, posterior teeth of plate, with a few smaller nodes visible between teeth; C, genital lobe; D– E, RV and LV exteriors in transmitted light, to show patch pattern and setules; F–G, RV and LV exteriors in reflected light to show patch pattern and smooth surface. Scale bar = 50 µm.

FIGURE 11. Bairdoppilata hirsutella Maddocks, n. sp. H:L scatter plot for 4 specimens from Eltanin station 25: Holotype specimen 634M (USNM 139891), and paratype specimens 635F (USNM 139892), 636W, and 689J (USNM 139894).Also plotted here are specimen 468F (SUM 121353), which was collected in the Gulf of Mexico and is of uncertain species identity, and the Lectotype RV of Bairdia hirsuta Brady.

FIGURE 16. A, B, Bairdoppilata scaura Maddocks [Hawaii]: A, male specimen 3860M: esophageal plate. B, male specimen 3864M: left lateral view of mouth region, with upper and lower lips, atrium, esophagus, U–shaped strut of upper lip, ciliate hemispherical mound of lower lip, flagellate seta projecting into atrium, and setules of forehead and sternum. C, Bairdoppilata sp. 2 [of Maddocks 2015, Hawaii]: female specimen 3969F: esophageal valve with ring, collar, belt and plate. D, Bairdoppilata sp. 3 [of Maddocks 2015, Hawaii]: female specimen 3923F: esophageal valve with collar, plate, bracket, and basal ends of braces. E, Bairdoppilata sp. 4 [of Maddocks 2015, Hawaii]: female specimen 3963F: esophageal plate with bracket. F–I, Bairdoppilata sp. 2 [of Morais & Coimbra 2017, Brazil], female specimen 817F: F, A2 claws; G, esophageal plate and bracket; H, both braces; I, genital lobe. Scale bar = 50 µm.