Leicacandona jula, Karanovic & McKay, 2010

Karanovic, Ivana & McKay, K., 2010, Two new species of Leicacandona Karanovic (Ostracoda, Candoninae) from the Great Sandy Desert, Australia, Journal of Natural History 44 (45 - 46), pp. 2715-2736 : 2727-2730

publication ID	https://doi.org/ 10.1080/00222933.2010.502977
persistent identifier	https://treatment.plazi.org/id/272C8788-F50B-FFD1-095B-B0BFFDDCFCEC
treatment provided by	Felipe
scientific name	Leicacandona jula
status	sp. nov.

Treatment

Leicacandona jula View in CoL sp. nov.

( Figures 3C, D View Figure 3 ; 4A, C View Figure 4 ; 5B View Figure 5 ; 6A, C, E View Figure 6 ; 7C, D, E View Figure 7 )

Material examined

Holotype Ƌ(dissected on one slide WAM C35722), from: Australia, Western Australia, Great Sandy Dessert, Telfer Gold Mine, HB 54, 12 August 2008, 21°43′40.8″S 122°12′20.5704″. No other individuals were found.

Diagnosis

Greatest H around middle, A1 five-segmented, Md-palp with one seta dorsally on first segment, prehensile palps almost symmetrical, penultimate segment of T2 undivided,

distal seta on same segment short, all basal setae on T3 present, penultimate segment undivided, posterior claw on CR reduced.

Etymology

“Jula” in the Pitjakali dialect means “blind”.

Description

Male. L = 0.33 mm. Greatest H situated behind mid-L, equalling 48% of L. Dorsal margin evenly rounded, without any arches, and sloping gently towards both anterior and posterior margins ( Figure 7C View Figure 7 ). Anterior margin broadly rounded being only slightly wider than posterior margin. Ventral margin straight. Inner calcified lamella fairly broad on both ends, anteriorly equalling 17% of L, posteriorly equalling 15% of L. Marginal pore canals very short, straight and dense. Surface of valve with sparse setae and transparent.

A1 ( Figure 4A View Figure 4 ). Five-segmented. First segment with only one anterior seta (proximal one, not shown on the figure) and two posterior setae. Second segment with one anterior seta being shorter than anterior margin of same segment. Third segment representing fused ancestral segments 3 and 4 and carrying one distal seta, very short, positioned anteriorly. Fourth segment representing fused ancestral segments 5 and 6 and carrying distally three long setae. Terminal segment free and with three long setae and most posterior one short. L ratios of last three segments 1:2.3:1. Aesthetasc not observed.

A2 ( Figure 4 View Figure 4 , 7D View Figure 7 ). Exopod consisting of three equally short setae. Endopod threesegmented. First segment ventrally with one aesthetasc (Y) located medially, and reaching distal end of same segment. First segment with two ventro-distal setae: one reaching middle of terminal claws, other reaching middle of second endopodal segment. Second endopodal segment without medio dorsal setae and with only one medio-ventral seta observed, reaching middle of terminal claws. Setae z1 and z2 transformed into long claws 0.85 times as long as first endopodal segment. Claw G2 as long as z-setae. Claw G1 reduced, but still claw-like and half as long as G2. Claw G3 reduced into thin seta, only slightly exceeding terminal segment. Claw Gm on terminal segment long, 0.7 times as long as first endopodal segment. Claw GM reduced. Length ratios of endopodal segment equalling 9:3.5:1.

Md. Same as in the previous species.

Mxl -palp. Two-segmented. First segment with three setae, terminal segment with three claw-like setae, of which one more prominent than others. All setae equally long.

Rake-like organ: With 10–11 teeth.

Prehensile palps ( Figure 3C View Figure 3 ). Palps almost symmetrical, both with prominent, long body and hook-like fingers. Finger on right palp being slightly shorter and more hook-like than on the left palp.

T2 ( Figure 6C View Figure 6 ). Basal segment without seta. First endopodal segment without seta. Second and third endopodal segments completely fused. Second with one seta not reaching distal end of penultimate segment, third with very short seta. Terminal segment with one postero-distal, and one antero-distal seta both being very short. Terminal claw 1.4 times as long as L of three distal segments combined.

T3 ( Figure 5B View Figure 5 ). Basal segment with all three setae present. First endopodal segment without seta. Second and third segments fused, distally short “g” seta not observed. Terminal segment with h1, h2 and h3 setae. Length ration of three setae: 1:2:16.

CR ( Figure 6A View Figure 6 ). Ramus short and stout. Anterior seta not present, posterior seta short not reaching distal margin, and inserted very close to the distal end of posterior margin. Posterior claw reduced and being only one-third as long as anterior claw. Anterior claw longer than anterior margin of ramus. Attachment of CR very simple ( Figure 5E View Figure 5 ).

Hemipenis ( Figure 3D View Figure 3 ). Lobe a triangular but broad, lobe b rounded with pointed outer side. Border between lobes not clearly visible. Lobe h not observed.

Zenker organ ( Figure 7E View Figure 7 ). With four + two whorls of spines. Females not collected.

Affinities

Leicacandona jula sp. nov. can easily be distinguished from L. pinkajartinyi by the carapace appearance, a short third segment on A1, a shorter second endopodal segment of A2, five-segmented legs T2 and T3, the hemipenis appearance and a much shorter posterior claw on the CR. Like L. pinkajartinyi , L. jula belongs to the group of Leicacandona species with a reduced posterior claw on the CR. Leicacandona jimi can be separated from L. jula by the presence of a keel-like formation on the carapace and a completely divided penultimate segment on T2. Leicacandona lite has a very similar carapace shape, and a similar internal morphology, including five-segmented legs T2 and T3. However, the two species differ in the appearance of the hemipenis, which has a much lower lobe a in the new species. Furthermore, Leicacandona lite has one dorsal seta on the second endopodal segment of the A2 and different L ratios of the three distal segments of the A1. Leicacandona quasihalsei has completely divided penultimate segments on both T2 and T3 and different appearances of both the prehensile palps and hemipenis. The main difference between L. jula and L. yandagoogeae is the L ratio of the three terminal segments of the A1 and the much longer posterior claw on the CR in L. yandagoogeae .