Neonesidea holdeni Maddocks, 2013

Maddocks, Rosalie F., 2021, 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, Zootaxa 4903 (4), pp. 451-492 : 474

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).

Figures

FIGURE 1. A–F, Neonesidea bacata Maddocks, specimen 3912M; G–L, Neonesidea edentulata Maddocks, 3958M; M–R, Neonesidea holdeni Maddocks, specimen 3908M. A–B, RV and LV exteriors in TL; C, A2 claw; D, DV of both hemipenes; E–F, DV of EV with ring, plate, bracket and braces; G–H, right and left exteriors of whole animal before dissection; I, A2 claw; J, DV of both hemipenes; K–L, VV of plate; M, both hemipenes; N–O, RV and LV exteriors in TL; P, A2 claw; Q–R, VV of EV with ring, bracket, plate and marginal teeth. Scale bar = 50 µm.

FIGURE 2. Neonesidea caraionae n. sp. A–K, holotype male specimen 1028M; L–T, paratype male specimen 1029M. A–B, RV and LV exteriors in TL; C–D, hemipenes; E, setulose terminal lobe of hemipenis; F, bifurcate tip of copulatory tube; G, A2 claw; H, VV of plate and bracket; I, posteroventral flange and sensilla of RV; J, posteroventral denticles and terminal spine of LV; K–L, RV and LV exteriors in RL; M, posteroventral marginal denticles and sensilla of LV; N–O, RV and LV exteriors in TL; P, AMS and NPC of LV; Q–T, EV and plate at high and low focus, and details of marginal teeth. Scale bar = 50 µm.