Ephemeroporus barroisi ( Richard, 1894 )

Sinev, Artem Y. & Yusoff, Fatimah M., 2016, A new species of genus Ephemeroporus Frey, 1982 (Cladocera: Anomopoda: Chydoridae) from Peninsular Malaysia, Zootaxa 4117 (3), pp. 399-410 : 406-408

Ephemeroporus barroisi ( Richard, 1894)

(Fig. 4)

Richard 1894, p. 375–377, figs. 9–12 ( Pleuroxus Barroisi ); Smirnov 1971, p. 301, fig. 328 ( Chydorus ); Idris 1983: 66, fig. 30 ( Chydorus ); Frey 1982, 234–237, Pl. 1: figs. 9–12; Smirnov 1996, 156–159, figs. 654, 658; Yalim & Chiplak, 2010: 551– 588, fig. 1–5; Kotov et al. 2013: 99, fig. 29 ( cf. barroisi ).

Material studied. over 40 parthenogenetic females, single ephippial female from Batu reservoir, Selangor province, Malaysia, 3o 16.483’ N, 101o 41.460’ E, 30.11.2014, coll. A. Y. Sinev and M. S. Abu Bakar, AYS-ML-77; 7 parthenogenetic females from roadside ditch with submerged terrestrial grass, Selangor province, Malaysia, 3o 18.005’ N, 101o 30.860’ E, 30.11.2014, coll. A. Y. Sinev and M. S. Abu Bakar, AYS-ML-75; 12 parthenogenetic females from pond at oil palm plantation, Johor province, Malaysia, 2o 12.048’ N, 103o 31.3170’ E, 17.10.2013, coll. A. Y. Sinev, F.M. Yusoff, P. Kuppan and M. S. Abu Bakar. AYS-ML-27; 6 parthenogenetic females from paddy field, Johor province, Malaysia, 2o 30.590’ N, 103o 50.044’ E, 18.10.2013, coll. A. Y. Sinev, F.M. Yusoff, P. Kuppan and M. S. Abu Bakar. AYS-ML-35; 16 parthenogenetic females from roadside ditch overgrown with submerged macrophytes, Johor province, Malaysia, 2o 34.057’ N, 103o 44.241’ E, 18.10.2013, coll. A. Y. Sinev, F.M. Yusoff, P. Kuppan and M. S. Abu Bakar. AYS-ML-41.

Description. Parthenogenetic female. Body of preserved specimens colorless, relatively opaque, without pigmented spots. In lateral view body rounded (Fig. 4A–B); height/length ratio about 0.9, maximum height at midline. Body only weakly laterally compressed. Dorsal outline evenly curved, ventral margin of valves with bulge at the middle, convex in anterior half and straight or weakly concave in posterior half.

Valves (Fig. 4C) same as in the previous species, but denticle of posteroventral corner (Fig. 4D–E) shorter; length of denticle about 2 width of denticle base.

Head, rostrum (Fig. 4F), and head shield same as in the previous species. Labrum (Fig. 4G–I), similar to that of the previous species, but with larger denticles on anterior margin of keel.

Postabdomen (Fig. 4J–K) of same shape as in the previous species. Dorsal margin with two distinctive groups of narrow sharp denticles, followed by two groups of short setulae. Distal group consists of 5–6 shorter denticles, their length strongly decrease basally. Basal group consists of only 2, rarely 3 longer denticles. Postanal part with 3–4 clusters of 5–8 short thin setulae, similar to these in anal portion. Postabdominal claw similar to that of the previous species, but spinule at the end of claw is longer, almost two times longer than shorter basal spine; its length exceed the width of claw base.

Antennule (Fig. 4L) and antenna (Fig. 4M), same as in the previous species.

Limb I. Similar to that of the previous species (Fig. 4N–O), but IDL seta 2 armed with long thin setules in distal part.

Limb II. Similar to that of the previous species (Fig. 4P), but scraping spines 6–8 longer than in previous species, almost as long as spine 5; spine 8 armed with thin short setules, same as on other spines.

Limb III (Fig. 4Q–R) Similar to that of the previous species, but inner setae (a–f) plumose, armed with symmetrical thin setules.

Limb IV (Fig. 4S–T). Epipodite oval, with projection as long as epipodite itself. Exopodite similar to that of the previous species, but seta 7 significantly shorter than seta 6. Inner portion of limb IV also similar, but distalmost flaming-torch setae (2) of same thickness along all length, not separated into basal and distal portions.

Limb V (Fig. 4U). Same as in the previous species.

Ephippial female of same proportions as parthenogentic female, but dorsal outline different: dorsal portion of head shield almost straight, dorsal margin of ephippium evenly convex, posterodorsal angle defined. Ephippium dark brown, with prominent polygonal sculpture, margins of polygons much thicker, than on the rest of valve.

Male unknown for populations from South-East Asia; for description of male from West Asia see Yalim & Ciplak (2010).

Size. Length of females in studied material was from 0.16–0.26 mm.

Taxonomic notes. Our data fully agrees with previous description of this species from Turkey ( Yalim & Chiplak, 2010), Iran ( Alonso, 1987), and Laos ( Kotov et al, 2013), no significant differences from these populations were revealed.

FIGURE. 4. Ephemeroporus barroisi (Richard, 1984) from Batu reservoir, Selangor province, Malaysia. A, outline of juvenile female. B–U, adult parthenogenetic female. B, lateral view. C, ventral margin of valves (from flattened valve). D–E, postroventral corner of valves. F, rostrum in frontal view. G–I, labrum. J, postabdomen. K, dorsal margin of postabdomen. L, antennule. M, antenna. N–U, thoracic limbs. N, limb I. O, IDL & ODL of limb I. P, exopodite and scraping setae of limb II. Q, exopodite of limb III. R, distal endite of limb III. S, exopodite of limb IV. T, inner portion of limb IV. U, limb V. V, ephippial female.

Distribution and ecology. Subtropical and tropical Asia, from Turkey and Syria to South China and Borneo Island. E. barroisi was also recorded in Korea, Africa and Australia ( Jeong et al. 2014; Smirnov & Timms 1983; Smirnov 1996), but these records should be rechecked. Common species in South-East Asia.

According to Idris (1983), E. barroisi is a very common species in Malaysia, found in any type of water bodies and especially frequent in ponds and rice fields. During our survey of Sabah state of Malaysia (Borneo Island) ( Sinev & Yusoff 2015) E. barroisi was found in four locations of 28 where cladocera were found; two lakes and a pond with abundant submerged macrophytes, and in an area of flooded forest.