Bairdoppilata

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 : 305

Bairdoppilata sp. 3

( Figs. 14–16 , 17A–F )

Material. Five specimens, including two females and three juveniles representing two instars.

Dimensions. Adult female specimen 3963F, carapace measured before dissection: length 995 µm, height 631 µm. See also Table 1 and Figures 2 and 4 .

Descriptive comments. Carapace rounded-subtriangular in lateral outline, with very high-arched dorsal margin and nearly straight, steeply sloping anterodorsal and posterodorsal margins, lacking angles; greatest height 0.69 of length, located at 0.54 of length; anterodorsal corner not distinguishable, located approximately at 0.37 of length and 0.92 of height; posterodorsal corner not distinguishable, located approximately at 0.57 of length and 0.89 of height; anterodorsal brim located at 0.04 of length and 0.59 of height; posterodorsal brim located located at 0.91 of length and 0.59 of height; greatest height of ventral indentation located at 0.42 of length and 0.08 of height. Slope (measured from horizontal) of mid-dorsal margin 3o, of anterodorsal margin 37o, of posterodorsal margin 47o, of dorso-caudal margin 34o, of hinge 3o. Caudate, with weak concavity separating dorsal-caudal margin from posterodorsal margin; length of caudal process 0.06 of length. Surface smooth, except for faint granular texture. Numerous simple setae, none very long. Seta 2 of furca with 1 or 2 unusually large proximal barbs (each side), followed by about 8 much smaller, regularly arranged barbs of decreasing size.

Comparisons. B. sp. 3 is about the same size as B. balihaiensis and B. cushmani ( Fig. 4 ). The sinuous, higharched lateral outline with distinct caudal process is shared with B. alcyonicola , B. cratericola and B. cushmani (group 3), but the (decalcified) surface is smooth, lacking the punctate texture of these and most species. The almost subtriangular LV outline resembles that of B. angolensis but has a more distinct caudal process.

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 14. Bairdoppilata sp. 3, female specimen 3923 F. A, first thoracic leg, some setae of vibratory plate are obscured; B, fringed claw of mandible palp; C, basal podomere (I) of second thoracic leg, left side; E, basal podomeres (I, II) of third thoracic leg, right side; E, terminal podomeres (II – V) of third thoracic leg; F, reflexed setae of maxilla; G, vibratory plate of maxilla; H, terminal podomeres (IV – VI) of antenna; I, distal claws of antenna with aesthetasc. Scale bar = 100 µm.

FIGURE 15. Bairdoppilata sp. 3, female specimen 3923 F. A, palp and masticatory processes of maxilla; B, teeth of mandible; C, masticatory organ; D, zygum, genital lobe, furca and post-abdominal bristle. Scale bar = 100 µm.

FIGURE 16. Bairdoppilata sp. 3, all female specimen 3923 F. A, RV exterior with attached dorsal fragment of LV; B, LV exterior, dorsal margin is torn; C, masticatory organ; D – E, LV exterior, anterior and posterior regions; F, right exterior of whole animal before dissection; G, left side of mouth region, with upper lip, atrium and lower lip; H, LV exterior with smooth surface, MSP with adductor muscles, NPC and carapace setae (detail of fig. B); I – J, distal claws of both antennae; K, right exterior of whole animal, posterior end, showing RPC, simple and plumose setae; L, right exterior of whole animal, posterodorsal region to show accessory dentition, higher focus than fig. K. Scale bar = 50 µm.

FIGURE 17. A – F, Bairdoppilata sp. 3, female specimen 3923 F; G – P, Bairdoppilata sp. 4, female specimen 3963 F. A, right exterior of whole animal before dissection, posterior region; B, enlarged proximal barbs of seta 2 of furca; C – D, genital lobes; E, left side of posterior body with zygum, furca and genital lobes; F, dorsal view of genital lobes, zygum, furcae, and postabdominal bristle; G, distal claws of antenna; H – I, tapering proximal barbs of seta 2 of furca; J, masticatory organ; K, right exterior of whole animal, filled with secondary crystals; L, valve fragment with setae and micropapillae; M – N, left exterior of whole animal, caudal region, showing plumose setae at high and low focus; O, left genital lobe and edge-bar of zygum; P, dorsal view of hinge region of decalcified carapace with sinusoidally folded chitin ribbons. Scale bar = 50 µm.