Xestoleberis becca, Chand, Prerna & Kamiya, Takahiro, 2016

Chand, Prerna & Kamiya, Takahiro, 2016, Seven new species of the genus Xestoleberis (Ostracoda: Podocopida: Cytheroidea) from the Fiji Archipelago, Zootaxa 4208 (4), pp. 325-348 : 328-329

publication ID	https://doi.org/ 10.11646/zootaxa.4208.4.2
publication LSID	lsid:zoobank.org:pub:6D3B4F32-7196-4DF9-B6E5-401FCF4A4CE6
DOI	https://doi.org/10.5281/zenodo.6078094
persistent identifier	https://treatment.plazi.org/id/8B57EE20-FFF7-B309-B4CC-3C7C43B58BFD
treatment provided by	Plazi
scientific name	Xestoleberis becca
status	sp. nov.

Treatment

Xestoleberis becca n. sp.

Type series. Holotype: male UMUT RA32562 ( Figs. 3 View FIGURE 3 A–B’, F–K, 2A–B), collected from type locality. Paratypes: male: UMUT RA32565 ( Fig. 10 View FIGURE 10 F–G, K1–K4), females: UMUT RA32564 ( Fig. 3 View FIGURE 3 C–E, L), UMUT RA32566 ( Fig. 10 View FIGURE 10 I–J), UMUT RA32567 ( Fig. 10 View FIGURE 10 H). Paratypes were collected from Tavewa Island (P1, Fig. 1 View FIGURE 1 , Table 1). The holotype and paratypes are deposited at the University Museum, University of Tokyo , Japan. Valves on paleontological paper/cavity slides and soft parts mounted on glass slides. Additional paratypes preserved in 70% ethanol: two males and three females UMUT RA32563.

Type locality. A coral rubble, coarse sand coast along the open coastline of Korotogo, Viti Levu Island (P3, Fig 1 View FIGURE 1 , Table 1); habitat: a short red alga ( Galaxaura divaricata ).

eccus is Latin for beak; the upper outside edges of the proximal structure of the hemipenes are shaped like beaks.

Diagnosis. Carapace with widely rounded posterior and anterior ends. Marginal pores line edges of carapace; anterior edges of carapace have branching pore canals. Coloration in living specimens transparent with opaque patches. BO short segment with numerous fine terminating setae. Ejaculatory ducts have irregular arrangements with inward exists. Furca reduced to short seta.

Description. Carapace reniform and strongly inflated ( Figs. 2 View FIGURE 2 A–B, 10A,–E5). Maximum valve length range: 372 µm–460 µm, maximum valve height range: 240 µm–274 µm ( Table 2). Maximum height at mid-length. Dorsal margin convex, ventral indentation about halfway along carapace. Wide anterior and moderate width posterior vestibula. Merodont hinge; median groove and bar of hinge finely locellate. Normal and (possibly) exocrine sieve pores scattered over carapace, simple pores along ventral and anterior edges. Scar pattern: posterior row of four adductor scars, single anterior scar trefoil.

An1 with six podomeres; first two big, wide and rectangular, third–sixth small and quadrate ( Fig. 3 View FIGURE 3 A–A’). Third podomere with one dorsal apical seta and fourth and fifth podomeres with one short and one long dorsal apical setae. Terminating setae of sixth podomere: one slender and round tipped, and three fine (one long and two short). An2 with one dorsal and two ventral medial setae and one stout ventral apical seta of second endopodite podomere ( Fig. 3 View FIGURE 3 B–B’). No prominent serrations on two terminating claws. Md coxa with six pointed and two lobate teeth and three fine setae ( Fig. 3 View FIGURE 3 C–E). Palp with four podomeres, first podomere with one fine ventral apical seta, second podomere with two long ventral and one long dorsal apical setae, two short medial setae at junction of second and third podomeres, third podomere with one ventral and five (four long and one short) dorsal apical setae, fourth podomere with one stout terminating claw and one fine terminating setae. Exopodite with at least two long setuled setae. Mx with two segmented palp; first segment with four distal dorsal-apical setae and second with three terminating setae ( Fig. 3 View FIGURE 3 F–F’). Branchial plate with 11 setuled setae. BO is symmetrical; short segment with numerous fine terminating setae ( Fig. 3 View FIGURE 3 G).

Basal setal formula for L5 1+1:2:1 and L6 and L7 1+1:1:1 ( Fig. 3 View FIGURE 3 H–J). Terminating claws L5, L6 and L7 short and curved. Hp with asymmetrical, trigonal to sub-trigonal distal processes: one with wide, rounded end, other with tapered end ( Fig. 3 View FIGURE 3 K). Proximal ends of the capsules almost right-angled and proximal support structure shaped like pair of beaks placed back to back. Furca short fine seta on small rounded base.

Distribution. Xestoleberis becca n. sp. occurs in four locations; including the holotype locality, this species also occurs in the southeast of Tavewa Island (P1), Korovou, Naviti Island (P2), and Viani, Vanua Levu (P5) ( Fig. 1 View FIGURE 1 , Table 1). In addition to the holotype habitat, specimen collections were also made from short red algae ( Pterocladiella sp. and Gracilaria maramae ), a tall brown alga ( Sargassum sp.) and sediments.

Remarks. Xestoleberis becca n. sp. is similar to Xestoleberis maculanitida Titterton & Whatley, 2005 ( Fig. 4 View FIGURE 4 , Nos. 15, 18, Pl. 3, Figs. 9 View FIGURE 9 –16, Titterton & Whatley 2005) from Solomon Islands and Xestoleberis paraporthedlandensis Hartmann-Schröder, 1978 (Abb. 409–422, Tafel XIII Figs. 1–2 View FIGURE 1 View FIGURE 2 , Hartmann-Schröder 1978) from Australia. In contrast with the mostly straight and simple (and some trifurcate) anterior marginal pores of X. maculanitida , the anterior marginal pores of X. becca are branching with at most five branches. The ejaculatory duct arrangements of X. becca and X. paraporthedlandensis vary. One of the Hp distal processes of X. paraporthedlandensis terminates into a seta while neither of the distal processes of X. becca n. sp. possesses any seta.