Xestoleberis penna, Chand, Prerna & Kamiya, Takahiro, 2016
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publication ID |
https://doi.org/ 10.11646/zootaxa.4208.4.2 |
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publication LSID |
lsid:zoobank.org:pub:6D3B4F32-7196-4DF9-B6E5-401FCF4A4CE6 |
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DOI |
https://doi.org/10.5281/zenodo.6078111 |
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persistent identifier |
https://treatment.plazi.org/id/8B57EE20-FFF9-B302-B4CC-3ACB47BA8D69 |
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treatment provided by |
Plazi |
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scientific name |
Xestoleberis penna |
| status |
sp. nov. |
Xestoleberis penna n. sp.
Type series. Holotype: male UMUT RA32538 ( Figs. 8 View FIGURE 8 G–K, 11A, D1–D4). Paratypes: females: UMUT RA32540 ( Fig. 8 View FIGURE 8 A–F’, L), UMUT RA32541 ( Fig. 2 View FIGURE 2 G–H), UMUT RA32542 ( Fig. 11 View FIGURE 11 B–C). All type material was collected from the type locality. 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 females and two juveniles UMUT RA32539.
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 ).
Etymology. Penna is Latin for wing or flight; the proximal support structure of the hemipenes is shaped like the wings of a bird in flight.
Diagnosis. Carapace posterior and anterior ends widely rounded and vertically compressed. Valve edges lined with numerous simple marginal pores. Coloration in living specimens translucent brown. BO short segment with numerous fine terminating setae. Ejaculatory ducts arranged in S-shapes with inward exits. Furca reduced to two short setae.
Description. Carapace ovate, vertically compressed and strongly inflated ( Figs. 2 View FIGURE 2 K–L, 11A–D4). Maximum valve length range: 495 µm–545 µm, maximum valve height range: 271 µm–330 µm ( Table 2). Maximum height at mid-length. Dorsal margin convex, ventral margin slightly sinuous. Both anterior and posterior vestibula narrow; posterior narrower than anterior. Merodont hinge. Normal sieve pores scattered over carapace; those lining anterior and antero-ventral edges of carapace more recessed and with smooth circumferences. Scar pattern: posterior row of four elongated adductor scars, and U-shaped anterior scar.
An1 with six podomeres; first two big, wide and rectangular, third–sixth small and quadrate ( Fig. 8 View FIGURE 8 A–A’). One medial seta at junction of second and third podomeres, third and fourth podomeres with one dorsal apical seta each, two dorsal apical setae on fifth podomere, terminating setae of sixth podomere: two slender and round tipped (one more conspicuous than other), one whip-like, and one fine. An2 with one ventral apical seta on first endopodite podomere, two dorsal and ventral medial setae and one ventral apical seta on second endopodite podomere ( Fig. 8 View FIGURE 8 B–B’). No prominent serrations on claws. Md coxa with nine pointed teeth and two fine setae (Fig. C–E). Palp with four podomeres: one dorsal and two ventral apical setae on second podomere, two short medial setae at junction of second and third podomeres, five dorsal and one ventral apical setae on third podomere, two stout terminating setae on fourth podomere. Exopodite with at least two long setuled setae. Mx with two segmented palp; first segment with three dorsal apical setae and second segment with four terminating setae ( Fig. 8 View FIGURE 8 F–F’). Branchial plate with 14–16 setuled setae. BO symmetrical short segment with numerous fine terminating setae ( Fig. 8 View FIGURE 8 G).
Basal setal formula for L5 1+1:2:1 and L6 and L7 1+1:1:1 ( Fig. 8 View FIGURE 8 H–J). Knee setae of legs hirsute. Terminating claws of L5, L6 and L7 stout, straight and with pointed tips. Hp with asymmetrical, wide, rounded to sub-rounded distal processes ( Fig. 8 View FIGURE 8 K). Proximal ends of capsules acutely angled and proximal support structure T-shaped. Furca two short setae (one slightly shorter than other) on short base.
Distribution. The distribution of Xestoleberis penna n. sp. appears to be restricted to the Korotogo area; south coast of Viti Levu (type locality above). Other than the holotype habitat ( Galaxaura divaricata ) about seven specimens of this species were also collected from the residue of coral rubble.
Remarks. Xestoleberis penna n. sp. is similar to Xestoleberis cauticola Hartmann-Schröder, 1978 reported from northwestern Australia (Abb. 370–384, Tafel XII Figs. 12–13 View FIGURE 12 View FIGURE 13 , Hartmann-Schröder 1978). However, unlike the very thin and straight L7 terminating claws of X. cauticola with a mass of short fine setae at the base of the claw, L7 claw of X. penna is straight and tapers to a point with a slight curve. The S-shaped ejaculatory ducts of both species also vary. In addition, the Hp distal processes of X. cauticola are triangular with narrow, rounded tips, while those of X. penna n. sp. are sub-triangular with widely rounded tips. X. cauticola has sub-rounded proximal capsule ends in contrast with the acutely angled proximal capsule ends of X. penna n. sp.
Species Type Sex Maximum Length Maximum Height (ML) (µm) (MH) (µm) Xestoleberis beccus n. sp. Holotype Male 383 248 Paratype Male 372 240 Paratype Female 460 274 Paratype Female 450 267 Xestoleberis concavus n. sp. Holotype Male 524 324 Paratype Female 539 331 Paratype Female 539 330 Paratype Female 546 335 Xestoleberis gracilariaii n. sp. Holotype Male 435 260 Paratype Male 407 260 Paratype Female 480 288 Paratype Female 400 245 Xestoleberis marculus n. sp. Holotype Male 452 260 Paratype Male 445 263 Paratype Female 440 262 Paratype Female 465 277 Xestoleberis natuvuensis n. sp. Holotype Male 465 255 Paratype Female 521 261 Paratype Female 506 280 Paratype Female 491 273 Xestoleberis penna n. sp. Holotype Male 495 271 Paratype Female 539 329 Paratype Female 545 330 Xestoleberis petrosa n. sp. Holotype Male 330 104 Paratype Male 328 153 Paratype Female 336 146 Paratype Female 377 165
| UMUT |
University Museum, University of Tokyo |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.