Paranesidea

Maddocks, Rosalie F., 2015, New and poorly known species of Bairdoppilata and Paranesidea (Bairdiidae, Ostracoda) from French Frigate Shoals and O’ahu, the Hawaiian Islands, Zootaxa 4059 (2), pp. 277-317 : 310-311

Paranesidea sp. 1

( Figs. 18–20 )

Material. Four adult females.

Dimensions. Adult female 3968F, carapace measured before dissection: Length 984 µm, height 660 µm. See also Table 1 and Figures 2 and 4 .

Descriptive Comments. Carapace smooth, high-arched; subtriangular-subcircular in lateral outline, with continuously curving dorsal margin, lacking anterodorsal and posterodorsal corners; greatest height located at 0.47 of length; anterodorsal brim located at 0.04 of length and 0.61 of height; posterodorsal brim located at 0.97 of length and 0.39 of height; highest point of ventral indentation located at 0.38 of length and 0.05 of height. Slope (measured from horizontal) of anterodorsal margin 37o, of posterodorsal margin 52o, of dorso-caudal margin 49o, of hinge 11o. Caudal extension short, broad, nearly triangular, with indistinct posterodorsal break in slope. No patch pattern is visible in the decalcified carapace, but pigment spots are evident. The fused antennal claw is distinctly pectinate.

Comparisons. P. sp. 1 lacks the conspicuously punctate surface texture and caudate outlines of the several species of Paranesidea described from Nosy Be. The carapace dimensions of P. sp. 1 would be at the uppermost edge of the size range for females of P. spongicola and too large for most of the others.

P. sp. 1 cannot be identified with any of the species of “ Bairdia ” reported by Holden (1967) from Hawaii or with any of the four species of Paranesidea reported by Holden (1976) from the Lower Miocene of Midway Island. Its anteroventral margin slopes more steeply than that of P. sp. 1 of Holden (1976, Pl. 9, fig. 6), and the pigment spots are smaller and round, rather than dorsoventrally elongated. Its upright, nearly triangular lateral outline resembles that illustrated for P. sp. 2 of Holden (1976, Pl. 9, fig. 5), but it is substantially larger, with less produced anterodorsal and posterodorsal angles. It is larger than P. onslowensis and smaller than P. poseidonicola .

Figures

FIGURE 2. Carapace dimensions for the species of Bairdoppilata and Paranesidea described here. The assemblages of B. scaura, B. sp. 2 and B. sp. 3 each include two late instars as well as adults; the others include only adult specimens. See also Table 1.

FIGURE 4. Carapace dimensions for 15 shallow-water species of Bairdoppilata. These data include adults only, of species for which the soft parts have been described. See also Table 2.

FIGURE 18. Paranesidea sp. 1, all female specimen 3968 F. A, antenna; B, distal claws of antenna with delicate aesthetasc, the fused seta is only faintly serrate, as usual for females; C, furca, seta 2 is incomplete; D, mandible; E. palp of maxilla with fringed claw. Scale bar = 100 µm.

FIGURE 19. Paranesidea sp. 1, female specimen 3968 F. A, third thoracic leg; B, second thoracic leg; C, first thoracic leg; D, vibratory plate of first thoracic leg; E, left side of mouth region, with forehead, upper lip, lower lip and atrium; F, genital lobe. Scale bar = 100 µm.

FIGURE 20. Paranesidea sp. 1. A – K, female specimen 3968 F; L – S, female specimen 3973 F. A, RV exterior, with attached dorsal fragment of LV; B, LV exterior, dorsal margin is torn; C, LV exterior, posterior margin; D, right exterior of entire animal before dissection, filled with secondary concretions; E – H, masticatory processes and fringed claw of palp of maxilla; I, genital lobe; J, distal claws of antenna; K, right exterior, anterodorsal region of fig. D, with median eye, isthmus and antennule; L – M, RV and LV exteriors, fragmentary; N – P, genital lobes before and after dissection; Q, serrate fused claw of antenna; R, distal claws of antenna; S, RV exterior, posterior region (detail of fig. L). Scale bar = 50 µm.