Callistocypris thailandensis, Savatenalinton, Sukonthip & Martens, Koen, 2013
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publication ID |
https://doi.org/ 10.11646/zootaxa.3686.5.6 |
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publication LSID |
lsid:zoobank.org:pub:71FEB254-76AC-4AB7-9AC7-157A2F7BFAF1 |
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DOI |
https://doi.org/10.5281/zenodo.6156318 |
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persistent identifier |
https://treatment.plazi.org/id/03B08D37-F914-FF85-0DE5-8F895F953922 |
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treatment provided by |
Plazi |
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scientific name |
Callistocypris thailandensis |
| status |
sp. nov. |
Callistocypris thailandensis sp. nov.
( Figs 2–4 View FIGURE 2 View FIGURE 3 View FIGURE 4 )
Type material: Holotype. Female, soft parts dissected in glycerine in a sealed slide, valves stored dry in a micropalaeontological slide (MSU-ZOC.093).
Paratypes. Two dissected female specimens (MSU-ZOC.094-095) stored like the holotype, one undissected female (MSU-ZOC.096) stored dry in micropalaeontological slide and 10 females (5 females from sample code TH004 and 5 females from sample code TH157) in 70% EtOH.
Repository. The holotype and all paratypes are deposited in the Natural History Museum, MSU (Mahasarakham, Thailand).
Type locality. The Nature trail in Khao Yai National Park, Nakhon Ratchasima province, Thailand. Material collected by SS on 20 September 2005 and 22 August 2009, coordinates: 14° 51΄ 41.5˝ N and 101° 33΄ 46.1˝ E. Accompanying ostracod fauna: Candona sp.
Etymology. The new species is named after Thailand, from where it is described.
Diagnosis. Carapace elongate in lateral and dorsal view, longitudinal ridges present in ventral view, A2 with three z-setae, Mx1-palp with four apical setae on distal segment, four apical and one medio-subapical setae on basal segment.
Differential diagnosis. Callistocypris thailandensis sp. nov. is similar to C. zlotini Shornikov, 1980 . The former can be distinguished by the more elongated carapace in lateral view, the chaetotaxy of several limbs, e.g. shorter dorsal subapical seta of A1, longer y a, longer y3 of A2, longer seta on A2-exopodite, longer apical seta on penultimate segment of T2. The new species differs from C. mckenziei Pinto et al., 2005 and C. rossettii Pinto et al., 2005 in the shape of the carapace (narrower carapace in dorsal and ventral views, lower carapace in lateral view), the presence of strong longitudinal ridges on the ventral part of the valves, the shape of the largest apical claw of the terminal segment of the Md-palp (no spoon- shaped apex) and other aspects of the chaetotaxy, e.g. longer aesthetasc Y on A2.
Measurements (in µm). Female: LV (n = 2), L = 372–373, H = 172–173; RV (n = 2), L= 361–362, H = 166– 167; Carapace (n = 2), L = 367–372, W = 206–210.
Description of female. Carapace in lateral view ( Fig. 2 View FIGURE 2 A) elongated, anterior and posterior margins rounded, dorsal margin slightly curved, with greatest height situated in the middle, ventral margin straight; LV overlapping RV along anterior, posterior and ventral margins.
Carapace in dorsal view ( Fig. 2 View FIGURE 2 B) elongated, with greatest width situated slightly behind mid-length; anterior and posterior extremities bluntly pointed.
Carapace in ventral view ( Fig. 2 View FIGURE 2 C) with ventral margin of LV slightly protruding at mid-length.
Valve surface dispersedly weakly pitted, RV and LV with rimmed-pore setae at anterior and ventral parts, in ventral view ( Fig. 2 View FIGURE 2 C) with longitudinal ridges.
LV in interior view ( Fig. 2 View FIGURE 2 D, F–G) with well-calcified inner lamella, anteriorly wide, with one inner list; posteriorly narrow, with three inner lists; postero-ventral with a shallow socket.
RV in interior view ( Fig. 2 View FIGURE 2 E, H–I) with marginal selvage, anterior calcified inner lamella wide, with two inner lists, posteriorly narrower; postero-ventrally with small, elevated ridge (accommodating to a socket on the LV).
A1 ( Fig. 3 View FIGURE 3 A) 7-segmented. First segment with one long dorso-subapical seta and two unequally long, ventroapical setae. Second segment with one dorso-apical seta. Rome organ and Wouters organ absent. Third segment bearing two (one dorso-, one ventro-) apical setae, the former almost reaching tip of terminal segment, the latter short. Fourth segment with two (unequally) long dorsal setae (the longest seta reaching far beyond tip of y a) and two short ventral setae. Fifth segment dorsally with two long setae, ventrally with two (one long, one short) setae. Sixth segment with four long setae. Terminal segment with three long apical setae and one long aesthetasc y a.
A2 ( Fig. 3 View FIGURE 3 B–C): exopodite with three (one long, two short) setae, the long one c. 2/3 of length of first endopodal segment. First endopodal segment with one long medio-subapical seta (almost reaching tip of penultimate segment), one minute seta, ventrally with long aesthetasc Y (reaching tip of segment) and one long apical seta (reaching beyond tip of terminal segment). Penultimate segment undivided, distally with three large serrated claws, aesthetasc y2 long (reaching beyond tip of terminal segment), z1–z3 setae long (almost reaching tip of end claws), two (one long, one shorter) dorsal setae and four ventral t-setae with claw-like t4 seta. Terminal segment with two serrated claws (length of Gm c. half of that of GM), a g-seta and an aesthetasc y2, length of the latter c. 2/3 of that of accompanying seta.
Md-palp ( Fig. 3 View FIGURE 3 D): first segment with two large s-setae, one long accompanying seta and a short α-seta. Second segment dorsally with two (unequally) long apical setae; ventrally with a group of three hirsute setae, one shorter seta and a β-seta, the latter plumose, cone-shaped and with pointed tip. Penultimate segment consisting of three dorso-subapical setae of unequal length, long, hirsute, stout γ-seta, one short and narrow seta and one long ventro-apical seta. Terminal segment bearing three claw-like setae (largest seta hirsute, with dome-shaped apex) and two short setae. Md with coxa elongate ( Fig. 4 View FIGURE 4 A).
Mx1 with two-segmented palp ( Fig. 4 View FIGURE 4 B), three endites and a branchial plate; basal segment of palp with a group of four long, unequal, dorso-apical setae and one medio-subapical seta, terminal segment elongated, apically with 2 large and 2 smaller setae.
T1 ( Fig. 4 View FIGURE 4 C): protopodite with one a-seta (not shown in figure), distally with c. 12 long, hirsute setae. Endopodite a short palp, bearing one long and one shorter apical setae.
T2 ( Fig. 4 View FIGURE 4 D): knee segment with d2 a hirsute seta, seta d1 absent.
Second segment with one long claw-like apical seta (almost reaching tip of penultimate segment) and set with setulae on ventral side. Penultimate segment divided, proximal segment (a) bearing one long claw-like apical seta (reaching tip of terminal segment), distal segment (b) with one long claw-like apical seta (length c. 2/3 of that of end claw). Terminal segment with one dorso-apical seta, one claw-like, ventro apical setae (length c. half of that of end claw) and a stout, serrated claw.
T3 ( Fig. 4 View FIGURE 4 E) a cleaning limb. First segment with two long and one short setae. Second segment with one short apical seta (less than half of the next segment).
Third segment with one long medio-seta (not reaching tip of segment).
Terminal segment with an apical broad seta, set with setulae in its distal 2/3, a short seta (length c. half of apical seta) and one long reflexed subapical seta (length c. 2/3 of that of third segment).
Caudal ramus ( Fig. 4 View FIGURE 4 F) reduced to a tapering, weakly sclerotized ramus, with one apical, seta-like claw.
Male unknown
Ecology. The new species is only known from its type locality, moist leaf litter in a tropical forest, at an altitude of 738 m a.s.l.
| MSU |
Michigan State University Museum |
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.