Hancockcandonopsis, Karanovic, 2018

Karanovic, Ivana, 2018, A new Candonopsini (Ostracoda) genus from subterranean waters of New South Wales (Australia), Zootaxa 4379 (2), pp. 247-267 : 260-261

Hancockcandonopsis sp. 1

Figure 10

Sampling locality: Bore 80437, Hunter Valley, New South Wales, 150°52’49”E 31°58’15”S, 04/07/2005, collector Peter Hancock.

Material examined. Female dissected on one slide (P. 100302); from the type locality.

Differential diagnosis. Carapace elongated in lateral view, surface smooth; A1 6-segmented; d1-seta on L6 present; e- and f-seta absent on both L6 and L7.

Description of female. Carapace elongated to reniform to elongated in lateral view ( Figures 10A ), with dorsal margin almost evenly arched. Anterior and posterior margins rounded, posterior being narrower than anterior one. Ventral margin slightly convex. Shell surface smooth and covered with long and dense sensilla. Inner calcified margin anteriorly wide. Marginal pore canals short and not branching. Maximum L around 0.5 mm. Greatest H situated posteriorly, equaling 40% of total L.

A1 ( Figure 10C ) 6-segmented. First segment with one anterior and two posterior setae. Second segment with one short anterior seta. Third segment bare; fourth segment with one short anterior seta. Fifth segment with one long and one short seta; sixth segment with two long, one short seta and aesthetasc about 2.5 times longer than terminal segment. L ratios between four distal segments equaling 1: 1: 1: 1.5.

A2 ( Figures 10E ) 5-segmented, with two protopodal and three endopodal segments. Exopod with one long and two short setae. Aesthetasc Y exceeding distal margin of first endopodal segment. First endopodal segment with one strong seta postero-distally. Penultimate segment with two t-setae. z1-seta transformed into short claw, z2- and z3-setae not observed. G1-, G2-, and G3-claws equally long. Gm-claw short, GM-claw long.

Md-palp ( Figure 10G ) 4-segmented. First segment without any setae anteriorly and with three setae posteriorly: two long (S1 plumose, plus additional smooth seta) and one short, smooth (α-seta) seta. Second segment with only one smooth seta anteriorly, passing mid length of the following segment; posteriorly same segment with two pappose setae in a bunch and one additional seta situated more medially on the segment; β-seta not observed. Penultimate segment with only one smooth seta anteriorly, smooth γ-seta antero-distally and one additional smooth seta postero-distally. Terminal segment short with only one claw broadly fused with the segment, one seta each on its anterior and posterior sides.

Mxl-palp ( Figure 10F ) with four smooth setae on the first segment. Second segment rectangular, with only one central claw, two short setae posteriorly to it, and one long smooth seta anteriorly.

Rake-like organ ( Figure 10D ) with approximately 10 small teeth.

L5 ( Figure 10H ) with one a-seta, b- and d-setae present.

L6 ( Figure 10I ) 5-segmented. Basal seta (d1) present. First and second endopodal segments bare. Terminal segment with two setae and one long smooth claw.

L7 ( Figure 10J ) 5-segmented. Basal segment with all three setae (d1, d2, dp). Endopodal segment without e- and f-setae, g-seta present. Terminal segment with three setae, h3-seta longest and hook-like distally, followed by h2- and h1-seta.

UR ( Figure 10K ). UR without posterior seta, anterior seta very short. L ratios between anterior margin, anterior claw, and posterior claw 2.4: 1.2: 1. Genital field rounded.

Males not collected.

Figures

FIGURE 10. Line drawings of Hancockcandonopsis sp. 1. Female (P.100302): A—RV, viewed from the inside; B—LV, viewed from the outside; C—A1 (notall setaeon the terminal segment illustrated); D—Rake-likeorgan;E—A2; F—Mxl-palp; G—Md-palp; H—L5; I—L6; J—L7; K—UT and genital segment. Scales= 0.1 mm.