Strandesia karanovicae, Savatenalinton, 2024

Savatenalinton, Sukonthip, 2024, Two new species of Strandesia Stuhlmann, 1888 (Crustacea: Ostracoda) from Thailand, with first record of a male S. martensi Savatenalinton, 2015, European Journal of Taxonomy 930, pp. 249-276 : 251-258

Strandesia karanovicae sp. nov.

urn:lsid:zoobank.org:act:19C96AD9-80BB-4F0D-9A79-8AD58B63B638

Figs 1–4

Diagnosis

Cp medium size (ca 950 μm), elongated in lateral view (length ca 1.95 × of height), LV overlapping RV all free margin, LV with one inner list, A1 seven-segmented with large and long R, WO present, A2 with long natatory setae, β seta on Md-palp large, two large bristles on third endite of Mx1 slightly serrated, d seta on T1 present, T2 with large d1 and d2 setae (length of d1 seta ca 1.5 × of d2 seta), h1 seta markedly long, CR slender, claw Ga less than half length of ramus (length ca 0.4 × of ramus), claws Gp ca ⅔ of claw Ga, sa seta slightly longer than claw Gp, sp seta slender, reaching slightly beyond tip of ramus, CR attachment with Triebel’s loop situated at middle of distal part of main branch.

Etymology

The species is named in honour of Prof. Dr Ivana Karanovic (Hanyang University, South Korea) in recognition of her significant work on the taxonomy of Ostracoda.

Type material

Holotype THAILAND – Roi-Et Province • ♀, soft parts dissected in glycerine on a sealed glass slide and valves stored dry in a micropalaeontological slide; Muang District; 16°2.1′ N, 103°52.6′ E; 23 Oct. 2010; rice field; MSU-ZOC.371 .

Paratypes THAILAND – Roi-Et Province • ♀, stored as the holotype; same collection data as for holotype; 23 Oct. 2010; MSU-ZOC.372 • 3 ♀♀, carapaces stored dry in micropalaeontological slides; same collection data as for holotype; 23 Oct. 2010; MSU-ZOC.373 to 375 .

Description

Female

MEASUREMENTS (in μm). Cp (n= 3): L=945–956, H = 483–497, W=461–467; LV (n =2): L=953–956, H =492– 495; RV (n= 2): L= 920–922, H =496– 500.

CP. (medium size) (ca 950 μm). Elongated in lateral view ( Fig. 1A ) (L ca 1.95 × H), anterior margin widely rounded, posterior margin slightly narrowly rounded, LV overlapping RV along all free margins, larger overlapping anteriorly, dorsal margin not strongly arched, greatest height situated in front of mid-length, valve surface with irregular dark patches and set with tiny tubercles and sparse thin rim-pore setae, tiny tubercles more prominent posteriorly than anteriorly and less abundant at middle part.

CP IN DORSAL VIEW ( Fig. 1B ). Elongated and tumid with greatest width situated at mid-length, anterior margin of LV slightly more protruded than RV.

LV IN INTERIOR VIEW ( Fig. 1C, E–F ). With groove along valve margin, wide anterior fused zone, dorsal margin gently arched, greatest height situated in front of mid-length; gently sloping down to anterior and posterior margin, the former widely rounded, the latter slightly less widely rounded, postero-dorsal part angulated, ventral margin somewhat straight; calcified inner lamella relatively wide anteriorly, with one inner list, posteriorly narrower.

RV IN INTERIOR VIEW ( Fig. 1D, G–H ). With marginal selvage, inner lamella without inner list, anteriorly broader than posteriorly, ventral margin somewhat straight.

A1 ( Fig. 2A ). First segment with two long ventro-apical setae, WO large (dorso-subapical seta absent). Second segment slightly wider than long, with one short dorso-apical seta (not reaching mid-length of next segment) and large and long R. Third segment bearing one long dorso-apical seta (reaching mid-length of fifth segment) and one ventro-apical seta with intermediate length (reaching beyond tip of next segment). Fourth segment with two long dorsal setae and two (one short, one longer) ventral setae, short seta reaching tip of next segment, longer seta reaching mid-length of sixth segment. Fifth segment dorsally with two long setae, ventrally with two (one long, one shorter) setae, shorter one reaching mid-length of terminal segment. Penultimate segment with four long setae. Terminal segment with three (two long, one short) apical setae and aesthetasc y a, length of short one ca ⅔ of that of aesthetasc y a, aesthetasc y a markedly long (ca 2.75 × that of terminal segment).

A2 ( Fig. 2B ). Protopodite with two ventro-proximal setae and one long ventro-subapical seta. Exopodite with three (one long, two short) setae, long one reaching beyond tip of first endopodal segment. First endopodal segment with five long natatory setae (not reaching tip of terminal claws) and one shorter accompanying seta, length of shorter seta reaching half way penultimate segment, aesthetasc Y large, insertion situated slightly in front of mid-length of segment, ventro-apical seta long, almost reaching tip of terminal segment. Penultimate segment undivided, distally with three serrated claws (G1–G3), aesthetasc y2 long (reaching slightly beyond tip of terminal segment), z1–z3 setae long; this segment medially with two (one long, one shorter) dorsal setae (length of short one ca ½ of that of the long one) and four ventral setae of unequal length (t1–t4). Terminal segment with two serrated claws (GM and Gm), g seta and aesthetasc y3, length of Gm ca ¾ of that of GM, length of aesthetasc y3 ca 3 /5 of that of Gm and slightly shorter than accompanying seta, length of g seta ca ¾ of aesthetasc y3.

MD-COXA ( Fig. 2C ). Elongated, distally set with rows of teeth (large dorsally and smaller ventrally) and small setae, and with one dorso-subapical seta, latter short (not reaching base of teeth).

MD-PALP ( Fig. 3A–B ). First segment with two large setae (S1 and S2), one slender, long seta and long, smooth α seta, the latter with wide proximal part and needle-like tip. Second segment dorsally with three unequal long apical setae, length of shortest seta ca ⅓ of that of longest seta; ventrally with group of three long hirsute setae, one shorter hirsute seta and β seta, latter large, plumose, cone-shaped and with pointed tip. Penultimate segment consisting of three groups of setae: dorsally with group of four unequal, long, subapical setae; laterally with apical γ seta and three further apical setae, former stout, hirsute, long (length ca 2.3 × that of terminal segment); ventrally with two (one long, one short) apical setae, latter reaching half way of terminal segment. Terminal segment bearing three claws and three setae.

MX 1 ( Fig. 3C ). With two-segmented palp, three endites and large branchial plate; basal segment of palp with group of five long, unequal apical setae, one long subapical setae and laterally one shorter subapical seta, latter reaching tip of terminal segment, terminal segment elongated, apically with three claws and three setae. Two large bristles on third endite slightly serrated. Sideways-directed bristles on first endite unequally long.

T1 ( FigS 3D–E , 4A ). Protopodite with two a setae (intermediate length), long b and d setae, distally with 14 (10 apical, four subapical) hirsute setae of unequal length. Endopodite weakly built palp with three unequal apical setae, length of shortest seta less than ⅓ of long one.

T2 ( Fig. 4B ). With large d1 and d2 setae, length of d1 seta ca 1.7 × that of d2 seta. Second segment with short e seta (reaching slightly beyond mid-length of penultimate segment). Penultimate segment divided, proximal segment bearing long f seta (reaching tip of terminal segment), distal segment with long g seta (reaching beyond tip of terminal segment) and tiny spine-like seta. Terminal segment with two (one dorsally, one ventrally) apical h1 and h3 setae and serrated claw (h2), h1 seta markedly long, and longer than h3 seta (ca 2 × that of h3), length of claw h2 longer than that of penultimate segment.

T3 ( Fig. 4C–D ). Cleaning limb. First segment with long d1, d2, dp setae. Second segment bearing apical e seta of intermediate length (reaching mid-length of next segment). Third segment with medially f seta (reaching tip of segment). Terminal segment with apical pincer and three setae, one short h1 seta, one claw-like h2 seta and one reflexed subapical h3 seta, length of latter ca 4 /5 of that of third segment.

CR ( Fig. 4E ). Slender, ventral margin of ramus with tiny setules. Claws Ga and Gp weakly serrated, length of claw Ga less than half length of that of ramus, length of claw Gp ca 3 /5 of that of claw Ga, sa seta slightly longer than claw Gp, sp seta slender, reaching slightly beyond tip of ramus.

CR ATTACHMENT ( Fig. 4F ). Stout with Triebel’s loop situated at middle of distal part of main branch, db and vb well-developed.

Male

Unknown.

Type locality

A total of 4 female specimens were collected at the type locality on 23 Oct. 2010. Accompanying ostracod fauna: Pseudocypretta maculata Klie, 1932 , Pseudostrandesia calapanensis (Tressler, 1937) , P. phetchabunensis Savatenalinton & Martens, 2010 , P. striatoreticulata (Klie, 1932) , Strandesia kraepelini (G.W. Müller, 1906) , Strandesia sp. and Tanycypris eugenkempfi Savatenalinton, 2017

Figures

Fig. 1. Strandesia karanovicae sp. nov., ♀. A–B. Paratype (MSU-ZOC.373). A. Cp, lateral right-side view. B. Cp, dorsal view. C–H. Holotype (MSU-ZOC.371). C. LV, internal view. D. RV, internal view. E. Posterior part of LV, internal view. F. Anterior part of LV, internal view. G. Anterior part of RV, internal view. H. posterior part of RV, internal view. Scale bars: 100 μm. Arrows point to anterior side. Abbreviations: see Material and methods.

Fig. 2. Strandesia karanovicae sp. nov., ♀, holotype (MSU-ZOC.371). A. A1. B. A2. C. Md-coxa. Abbreviations: see Material and methods.

Fig. 3. Strandesia karanovicae sp. nov., ♀, holotype (MSU-ZOC.371). A. Md-palp.B. Terminal segment of Md-palp. C. Mx1. D. T1. E. Endopodite of T1 (palp). Abbreviations: see Material and methods.

Fig. 4. Strandesia karanovicae sp. nov., ♀, holotype (MSU-ZOC.371). A. Terminal part of T1 protopodite. B. T2. C. T3. D. First segment of T3. E. CR. F. CR attachment. Abbreviations: see Material and methods.