Strandesia martensi Savatenalinton, 2015

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 : 265

Strandesia martensi Savatenalinton, 2015

Figs 9–11

Material examined

THAILAND – Amnat Charoen Province • 4 ♂♂, with soft parts dissected in a sealed glycerine slide, valves stored dry in a micropalaeontological slide;Nong Hoi (swamp), Sawang Daen Din District, Sakon Nakhon Province ; 17°38.85′ N 103°59.99′ E; S. Savatenalinton leg.; 18 Nov. 2021; MSU-ZOC.383 to 385 , 388 • 4 ♂♂, undissected, stored dry in micropalaeontological slides; same collection data as for preceding; MSU-ZOC.386 to 387 • 2 ♀♀, with soft parts dissected in a sealed glycerine slide, valves stored dry in a micropalaeontological slide; same collection data as for preceding; MSU-ZOC.389 to 390 • 1 ♀, undissected, stored dry in a micropalaeontological slide; same collection data as for preceding; MSU-ZOC.391 • several ♂♂, several ♀♀, undissected, kept in 70% ethyl alcohol; same collection data as for preceding; MSU-ZOC.392 .

Dsecription

MEASUREMENTS (in μm). Asexual female. Cp (n =15): L=865–888, H =553–568, W=410–412; LV (n=2): L=824–853, H =535–541; RV (n= 2): L=800–838, H =524–553. Sexual female. Cp (n =2): L= 798–800, H =550–551; LV (n =2): L=800–803, H =553–555; RV (n=2): L=776–779, H =550– 553. Male. Cp (n=2): L= 735–771, H= 494, W=318; LV (n= 2): L=794–796, H =500–502; RV (n =2): L= 735–738, H =488–491.

CP AND VALVES. As in female (see Savatenalinton 2015), although somewhat smaller ( Fig. 9 ). All limbs as in female, except for last two segments of A2, T 1 and reproductive organs ( Fig. 10 ). Penultimate segment of A2 undivided and with claw-like z1 and z2 setae and with claw G1 and G3 reduced to setae; terminal segment with claw Gm modified appearing strong spines on distal half of claw and with claw GM reduced to short seta ( Fig. 10A–B ); T 1-endopodites forming asymmetrical prehensile palps; left palp ( Fig. 10C ) anteriorly with elongated, hook-like curved lobe and two apical spines, right palp ( Fig. 10D ) anteriorly with triangular lobe and two apical spines (one very large).

HEMIPENIS ( Fig. 10E ). With ms rounded, ls elongated with blunt tip. Postlabyrinthal spermiduct curved, with 2 loops. Zenker organ ( Fig. 10F ) set with ca 19–22 spiny whorls, length about 3.7 × width, distal and proximal end plates forming crown of petal-like structures.

Locality

Sexual population: Nong Hoi (swamp), Sawang Daen Din District, Sakon Nakhon Province; 17°38.85′ N 103°59.99′ E; collected by S. Savatenalinton, 18 Nov. 2021. Other localities see Table 1 .

Figures

Fig. 9. Strandesia martensi Savatenalinton, 2015. A–E. ♂. F. ♀, asexual. G–H. Sexual. A. Cp, dorsal view (MSU-ZOC.386). B. Valve surface of Cp, right lateral view (MSU-ZOC.387). C. Cp, right lateral view (ditto). D. LV, internal view (MSU-ZOC.383). E. RV, internal view (ditto). F. Cp, right lateral view (MSU-ZOC.391). G. LV, internal view (MSU-ZOC.389). H. RV, internal view (ditto). Scale bars: A, C–H =100 μm; B =10 μm. Arrows point to anterior side. Abbreviations: see Material and methods.

Fig. 10. Strandesia martensi Savatenalinton, 2015, ♂ (MSU-ZOC.383). A. A2. B. Terminal part of A2. C. Left T1. D. Right palp of T1. E. Hemipenis. F. Zenker organ. Abbreviations: see Material and methods.

Fig. 11. Strandesia martensi Savatenalinton, 2015, ♀, asexual. A. Cp, right lateral view (MSU-ZOC.393). B. Cp, dorsal view (MSU-ZOC.394). C. Valve surface of Cp, right lateral view (MSU-ZOC.393). D. Muscle scars of RV (MSU-ZOC.392). E. LV, internal view (ditto). E. RV, internal view (ditto). Scale bars: A–B, E–F =100 μm; C= 20 μm; D =50μm. Arrows point to anterior side. Abbreviations: see Material and methods.