Streblocerus spinulatus Smirnov, 1992

Sinev, Artem Y., Dadykin, Ivan A., Umi, Wahidah A. D. & Yusoff, Fatimah M., 2025, New data on Cladocera (Crustacea: Branchiopoda) of Peninsular Malaysia, Zootaxa 5604 (3), pp. 255-284 : 259

publication ID	https://doi.org/10.11646/zootaxa.5604.3.3
publication LSID	lsid:zoobank.org:pub:C8E5E697-223C-45A0-A104-134328213586
DOI	https://doi.org/10.5281/zenodo.15035823
persistent identifier	https://treatment.plazi.org/id/03F2AF08-FFB3-FFC4-C7D2-208BFACFF8D6
treatment provided by	Plazi (2025-03-16 17:36:46, last updated 2025-03-18 16:18:37)
scientific name	Streblocerus spinulatus Smirnov, 1992
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Streblocerus spinulatus Smirnov, 1992 View in CoL

Fig. 2 View FIGURE 2

Idris & Fernando 1981a: 237–238, Figs. 8–10 View FIGURE 8 View FIGURE 9 View FIGURE 10 ( pygmaeus ); Idris 1983: 42–43, Fig. 20 ( pygmaeus ); Smirnov 1992: 126, Figs. 528–530.

Material examined. Several parthenogenetic females from a forest waterbody near Muadzam Shah , Pahang, (3.12474° N, 102.9969° E), 18.10.2013 GoogleMaps ; 11 parthenogenetic females from Chini Lake , Pahang state (3.43257° N, 02.9186° E), 19.03.2013 GoogleMaps ; several parthenogenetic females from various locations in Bera Lake , Pahang, on 1.02.2018 .

Body shape of the studied specimens ( Fig. 2A–C View FIGURE 2 ) is typical of the genus, with a head length of about half the length of the valves. Valves and head are covered by a peculiar scale-like sculpture. The morphology of antennule, antenna and labrum is typical of the genus ( Fig. 2D–E View FIGURE 2 ). Streblocerus spinulatus clearly differs from the Eurasian S. serricaudatus s. lato (see Hudec 2010 and Tiang-nga et al. 2020), Venezuelan S. superserricaudatus Smirnov, Alvarez & Castillo, 1995 (see Smirnov et al. 1995) and West African S. inexpectatus Dumont, 1981 (see Dumont 1981) in absence of denticles on preanal margin of the postabdomen (see Fig. 2F View FIGURE 2 ). Streblocerus spinulatus differs from its sibling species, S. pigmaeus Sars, 1901 , in having much longer setulae on preanal margin of the postabdomen (see Fig. 2F View FIGURE 2 ).

Streblocerus spinulatus was described by Idris & Fernando (1981a) from Peninsular Malaysia as S. pygmaeus Sars, 1901 , although the latter is described from Brazil and is known from the Central and South America. Smirnov (1992) has proposed that this population belongs to a distinct species. Streblocerus spinulatus is known from a few localities in Peninsular Malaysia: Chini Lake, Pahang (our data), Subang Lake, Selangor, Batang Bertunjai pond, Selangor and Mengkarak rice field and Pahang ( Idris & Fernando 1981a). Also, the species was observed in one locality in Sabah, East Malaysia ( Sinev & Yusoff 2018) and in North-East Thailand ( Tiang-nga et al. 2020). Records of Streblocerus from China in Chiang & Du (1979) might also belong to S. spinulatus and should be revised.

References

Chiang, S. C. & Du, N. S. (1979) Fauna Sinica: Crustacea: Freshwater Cladocera. Science Press: Beijing, 297 pp. [in Chinese]

Dumont, H. J. (1981) Cladocera and free-living Copepoda from the Fouta Djalon and adjacent mountain areas in West Africa. Hydrobiologia, 85, 97-115. https://doi.org/10.1007/BF00006620

Hudec, I. (2010) Fauna Slovenska III. Anomopoda, Ctenopoda, Haplopoda, Onychopoda (Crustacea: Branchiopoda). Veda, Bratislava, 496 pp.

Idris B. A. G. & Fernando, C. H. (1981 a) Cladocera of Malaysia and Singapore with new records, redescriptions, and remarks on some species. Hydrobiologia, 77, 233-256. https://doi.org/10.1007/BF00019671

Idris, B. A. G. (1983) Freshwater zooplankton of Malaysia (Crustacea: Cladocera). Universiti Pertanian Malaysia Press, Serdang, Selangor, 153 pp.

Sinev, A. Y. & Yusoff, F. M. (2018) New data on Cladocera (Crustacea: Branchiopoda) of Sabah State, Borneo Island, Malaysia. Zootaxa, 4438 (2), 362-372. https://doi.org/10.11646/zootaxa.4438.2.10

Smirnov, N. N. (1992) The Macrothricidae of the world. Guides to the identification of the microivertebrates of the Continental Waters of the world. Vol. 1. SPB Academic Publishing, The Hague, 143 pp.

Smirnov, N. N., Alvarez, H. & Castillo, M. M. (1995) Streblocerus superserricaudatus sp. nov. from Venezuela. Hydrobiologia, 312, 167-170. https://doi.org/10.1007/BF00015509

Tiang-Nga, S., Sinev, A. Y. & Sanoamuang, L. (2020) High diversity of Cladocera (Crustacea: Branchiopoda) in a Ramsar site Lake Kud - Thing, Northeast Thailand. Zootaxa, 4780 (2), 275-290. https://doi.org/10.11646/zootaxa.4780.2.3

Figures

FIGURE 2. Streblocerus spinulatus Smirnov, 1992 from Chini Lake, Pahang, Malaysia, parthenogenetic female. A, lateral view. B, dorsal view. C, ventral view. D, head in ventral view. E, antennule. F, postabdomen.

FIGURE 8. Coronatella (Coronatella) acuticostata (Sars, 1903) from roadside pond, Pahang, Malaysia, parthenogenetic female. A–C, lateral view, D–E, dorsal view. F, ventral view. G, postero-ventral portion of valves. H–I, postro-ventral angle of valves.

FIGURE 9. Coronatella (Coronatella) acuticostata (Sars, 1903) from a roadside pond, Pahang, Malaysia, parthenogenetic female. A, rostrum and labrum. B, head pores. C, labrum and thoracic limb I. D, frontal head pore (indicated by arrow). E–F, postabdomen. G, antenna.

FIGURE 10. Coronatella (Coronatella) acuticostata (Sars, 1903) from a roadside pond, Pahang, Malaysia, thoracic limbs of parthenogenetic female. A, limb I. B–C, IDL and ODL of limb I. D–E, inner and outer parts of limb II. F, exopodite of limb III. G, exopodite of limb IV. H, limb V (inner setae not shown). Karualona serrulata Van Damme, Maiphae & Sa-adrit, 2013 from from a lake at Paya Indah Wetland, Selangor, parthenogenetic female. I, lateral view. J, posteroventral angle of valves, K, labrum. L, postabdomen.