On the subfamily Cypricercinae McKenzie, 1971 (Crustacea, Ostracoda) from Thailand, with the description of six new species 2379 Author Savatenalinton, Sukonthip Author Martens, Koen text Zootaxa 2010 2010-02-26 2379 1 77 journal article 1175­5334 Strandesia kraepelini (G.W. Müller, 1906 ) ( Figs 9–11 ) 1906 Cypris kraepelini G.W. Müller : 139, Pl. 1, Figs 1–7 1912 Strandesia kraepelini — G.W. Müller: 190. Material examined. Many females from several samples (see Table 1 ). TABLE 1. List of localities of Strandesia kraepelini (G.W. Müller, 1906 ) recorded in this study.
Localities Coordinates N (° ʹ ˝) E (° ʹ ˝) Sample code Sampling date pH Temp (° C)
Kwan Phayao Lake 19 09 28.2 99 54 39.2 TH 028 24/09/05 6.8 30.6
TH 087 10/02/06 7.0 24.5
TH 126 12/11/06 7.2 28.0
TH 142 06/10/07 7.1 26.8
Fish Pond 19 09 28.6 99 34 39.2 TH 029 24/09/05 7.1 36.8
Mae Peum Reservoir 19 21 24.6 99 52 09.8 TH 030 24/09/05 6.6 33.7
TH 089 10/02/06 7.0 27.8
TH 127 12/11/06 7.3 31.0
TH 143 07/10/07 7.2 28.4
Mae Thang Reservoir 18 13 26.6 100 19 4.9 TH 039 26/09/05 6.8 38.3
Roadside Canal 16 48 08.8 100 19 53.4 TH 043 27/09/05 6.9 27.9
Bung Si Fai Lake 16 25 20.7 100 20 37.4 TH 047 27/09/05 6.6 33.5
TH 109 13/02/06 6.5 28.4
TH 130 13/11/06 7.2 33.0
TH 148 08/10/07 7.4 31.0
Nong Naree Swamp 16 26 19.7 101 08 33.0 TH 051 28/09/05 6.8 27.6
TH 113 13/02/06 7.0 26.5
TH 132 14/11/06 7.2 29.5
TH 149 09/10/07 7.1 28.4
Huai Pao River 16 23 2.9 101 58 46.9 TH 055 28/09/05 7.0 26.6
TH 152 09/10/07 7.2 29.6
Bung Bora Phet Lake 15 42 38.3 100 11 29.8 TH 065 07/02/06 7.0 26.5
TH 120 10/11/06 7.0 31.0
Chao Phraya River 15 41 13.9 100 07 01.0 TH 066 07/02/06 7.0 27.2
Chiang Saen Lake 20 15 35.5 100 02 48.8 TH 092 11/02/06 6.5 22.5
TH 144 07/10/07 7.5 28.9
Wang Pikul Pond 16 45 07.4 100 18 26.1 TH 106 13/02/06 7.0 245
TH 122 11/11/06 7.0 34.5
Hin Lek Fai Canal 16 11 09.5 100 51 56.1 TH 112 13/02/06 7.0 28.5
Huai Prasatyai Reservoir 15 07 23.7 101 33 22.8 TH 119 10/11/06 7.0 34.0
Roadside Canal 16 27 41.8 100 08 51.7 TH 121 11/11/06 6.7 33.0
Roadside Canal 17 01 48.9 100 18 51.2 TH 124 11/11/06 6.5 31.0
Chalianglub Reservoir 16 24 29.7 101 17 00.8 TH 134 14/11/06 6.8 29.4
Lopburi River 14 47 55.5 100 38 29.8 TH 140 05/10/07 7.2 29.2
Nalao natural spring 16 35 27.0 101 53 53.3 TH 151 09/10/07 7.0 26.7
Bung Lahan Lake 15 36 34.3 101 54 10.7 TH 154 09/10/07 7.5 29.2
Diagnosis. Carapace in lateral view subovate, greatest height situated in front of mid-length, anterior margin broadly rounded, posterior margin more narrowly rounded; valve surface weakly tuberculated; carapace in dorsal view subelliptical, greatest width situated at mid-length; LV overlapping RV along anterior, ventral and posterior margins; LV with internal groove along valve margin, without inner list; Wouters organ on A1 small, Rome organ long, aesthetasc ya on terminal segment shorter than short apical seta on A1; aesthetasc Y on A2 long; d seta on T1 present; caudal ramus stout, length of distal claw c. half of that of ramus, distal seta c. half of that of distal claw, proximal seta reaching tip of ramus; caudal ramus attachment stout, with Triebel’s loop situated at middle of distal part of main branch, dorsal and ventral branches well-developed. Differential diagnosis. Strandesia kraepelini ( Müller, 1906 ) is similar to S. complexa Victor & Fernando, 1981 . It can be distinguished by the absence of lip-like flange on anterior margin of LV, wider rounded posterior margin, weakly tuberculated valve surface and longer distal claw of ramus. For distinctions between S. kraepelini , S. perakensis and S. sanoamuangae sp. nov. , see description of the latter species above. Measurements (in µ m) . LV (n=2), L=755–763, H=423–438; RV (n=2), L=736–738, H=415–436; Carapace (n=2), L=757–772, W=403–405. FIGURE 9. Strandesia kraepelini ( Müller, 1906 ) , female. A. Carapace, right lateral view (O.C.3132). B. Carapace, dorsal view (idem). C. Carapace, ventral view (MSU-ZOC.056). D. LV, interior view (O.C.3131). E. RV, interior view (idem). Scale bar: A–E: 200 µm. Arrows point toward the anterior end. FIGURE 10. Strandesia kraepelini ( Müller, 1906 ) , female. A. A1 (MSU-ZOC.055). B. A2 (O.C.3131). C. A2, terminal segment (idem). D. Md-coxa (MSU-ZOC.055). E. Md-palp (idem). F. Md-palp, terminal segment (idem). G. T1 (idem). H. T1, protopodite (O.C.3131). Scale bars: A–D, G: 100 µm; E–F, H: 50 µm. Ecology. This species is thus far recorded from diverse ecological habitats, ranging from lakes, ponds, ricefields, man-made reservoirs, mining pools, marshes, streams, swamps, irrigation drainage to roadside canals and natural springs ( Victor & Fernando 1981b ; this study). It was found in a pH range of 6.50–7.50 and a temperature range of 22.5–38.3° C. Abbreviated redescription of female. Carapace in lateral view ( Fig. 9A ) subovate (length c. 1.75 times height), dorsal margin arched, ventral margin somewhat straight, greatest height situated in front of midlength, anterior margin broadly rounded, posterior margin more narrowly rounded; valve surface weakly tuberculated. Carapace in dorsal view ( Fig. 9B ) subelliptical, greatest width situated at mid-length; LV overlapping RV along anterior, ventral and posterior margins. Carapace in ventral view ( Fig. 9C ) subelliptical, ventral margin slightly sinuous at mid-length. LV in interior view ( Fig. 9D ) subovate, with groove along valve margin, dorsal margin arched, ventral margin slightly sinuous, greatest height situated in front of mid-length, anterior margin broadly rounded, posterior margin rounded, with slightly pointed edge at mid-height; calcified inner lamella wide anteriorly, without inner list, posteriorly more narrow. RV with shape generally as in the LV, except for the continuously rounded posterior margin; in interior view ( Fig. 9E ) without selvage; inner lamella without inner list. FIGURE 11. Strandesia kraepelini ( Müller, 1906 ) , female. A. Mx1 (MSU-ZOC.055). B. T2 (O.C.3131). C. T3 (MSU- ZOC.055). D. T3, distal end (idem). E. Caudal ramus attachment (idem). F. Caudal ramus (O.C.3131). Scale bars: A, D, E–F: 50 µm; B–C: 100 µm. A1 ( Fig. 10A ): first segment with small proximal Wouters organ and two subequal ventro-apical setae; second segment with a long Rome organ and short dorso-apical seta; aesthetasc ya on terminal segment shorter than short apical seta. A2 ( Fig. 10B–C ): exopodite with longest seta reaching tip of first endopodal segment; first endopodal segment with long aesthetasc Y, natatory setae long (longest setae almost reaching tips of claws), length of shortest seta c. 1/4 of that of penultimate segment, ventro-apical seta long (reaching tip of terminal segment); penultimate segment distally with three serrated claws (length c. 1.4 times of that of penultimate segment), aesthetasc y2 long (reaching beyond tip of terminal segment); terminal segment with two serrated claws, long g seta and aesthetasc y3, the latter c. 2/3 of accompanying seta. Lateral subapical seta on basal segment of Mx1-palp short ( Fig. 11A ), one of two large bristles on third endite smooth, sideways directed setae on first endite unequal, short one c. half of long one. T1 ( Fig. 10G–H ) with a-, b- and d-setae all present. T2 ( Fig. 11B ) with d1 c. twice the length of d2. Caudal ramus ( Fig. 11F ) stout, with ventral margin weakly serrated, distal and proximal claws long, serrated, length of distal claw c. half of that of ramus, distal seta short (c. half of that of distal claw), proximal seta long (reaching tip of ramus). Caudal ramus attachment ( Fig. 11E ) stout, with Triebel’s loop situated at middle of the distal part of the main branch, dorsal and ventral branches well-developed. Male unknown. Remarks. Strandesia kraepelini (G.W. Müller, 1906 ) was described from Java by G.W. Müller (1906) . Victor & Fernando (1981b) reported this species from Malaysia and Indonesia . In this study, we found this species in several localities in Thailand . The morphology of valves and soft parts of Thai specimens are congruent with those of Malaysian and Indonesian specimens except for two features: 1) while both large bristles on third endite of Mx1 are smooth in Malaysian and Indonesian specimens, there are one smooth and one slightly serrated in Thai specimens; 2) the dorsal subapical seta on the first segment of the A1 is absent in the Thai material, whereas this seta was not mentioned in previous papers.