Macroplea Samouelle, 1819

Lou, Qiaozhe, Yu, Peiyu & Liang, Hongbin, 2011, Two new species of Macroplea Samouelle (Coleoptera: Chrysomelidae: Donaciinae) from China, with a key to all known species, Zootaxa 3003, pp. 1-21 : 2

Genus Macroplea Samouelle, 1819

Macroplea Samouelle, 1819: 211 (Type species Donacia zosterae Fabricius, 1801 ). Apelma Billberg, 1820: 57 (Type species Donacia zosterae Fabricius, 1801 ).

Haemonia Dejean, 1821: 114 (Type species Donacia zosterae Fabricius, 1801 ).

Diagnosis. Dorsum and legs yellow or brown ( Figs 1, 3 , 24, 26 , 50–53 ); vertex with dense pubescence ( Figs 6 , 29 , 50–53 ); antenna long, extending beyond middle of elytron ( Figs 1–4 , 50, 52, 53 ), or short, not extending beyond middle of elytron ( Figs 24–27 ); pronotum with setae at anterior angles ( Figs 5 , 28 , 56–59 ); pronotum with distinct anterior and posterior beads ( Figs 5 , 28 , 56–59 ); punctures along elytral striae arranged more or less in paired rows ( Figs 1, 3 , 50–53 ), or in single rows ( Figs 24, 26 ); elytron with or without spine at outer apical angle ( Figs 12 , 35 , 64–67 ); metafemur slender, without tooth ( Figs 1–4 , 24–27 , 50–53 ); profemur with a short linearly arranged brush of setae basally on posterior surface ( Figs 16 , 36 ); metatarsus with markedly reduced pubescence, fifth tarsomere elongate, at least as long as basal three combined ( Figs 10 , 39 , 68, 70, 71 ); endophallus with two ELDs fused, enclosing MEG, without pELD ( Figs 21, 22 , 47–49 , 74 , 75, 77 , 78, 81–83 ).

Distribution. Europe, northern Africa ( Algeria), Middle Asia, Siberia, Far East, China and Japan. Distribution in China: Heilongjiang, Hebei, Tianjin, Ningxia, Gansu, Xinjiang, Jiangsu, Hubei, Sichuan, Guizhou ( Fig. 85 ).

Host plants. Ranunculus L. ( Ranunculaceae ), Carex L. ( Cyperaceae ), Brasenia Schreb. (Cabombaceae) , Potamogeton L. ( Potamogetonaceae ), Myriophyllum L. ( Haloragaceae ), Ruppia L. ( Zosteraceae ), Zostera L. ( Zosteraceae ), Sparganium L. ( Sparganiaceae ) ( Bieńkowski & Orlova-Bieńkowskaja, 2004), Vallisneria L. ( Hydrocharitaceae ), Ottelia Pers. (Hydrocharitaceae) and Hippuris L. ( Hippuridaceae ) (recorded in this paper).

Biology. Macroplea is a fully aquatic genus. They live in lentic or lotic water. Both M. appendiculata and M. mutica live in brackish as well as fresh water ( Borowiec, 1984; Kölsch et al., 2006; Saari, 2007; Mende et al., 2010). According to Mende et al. (2010: 101), immobility (cannot swim or fly) is believed to be a specific feature of M. mutica . However, three specimens of M. japana examined in this study were collected by light trap.

Remarks. Identification of species of Macroplea is difficult, despite the genus being less speciose. Many workers have used external morphology, male genitalia, ecological features, and molecular data to delimit species of this genus ( Freude et al., 1966; Daccordi & Ruffo, 1978; Mohr, 1985; Beenen & Winkelman, 1989; Hayashi & Shiyake, 2001; Kölsch et al., 2006). We have followed many of these workers to enhance the reliability of the key. Species of Macroplea can be separated from those of Neohaemonia Székessy in new world by the following characters: 1) vertex with dense pubescence (with a glabrous patch in Neohaemonia ); 2) pronotum with setae at anterior angles (such setae absent in Neohaemonia ); 3) pronotum with distinct anterior and posterior beads (such beads absent in Neohaemonia ); 4) profemur with a short linearly arranged brush of setae basally on posterior surface (such brush of setae absent in Neohaemonia ); 5) endophallus without pELD (pELD present in Neohaemonia ).

Figures

FIGURE 85. Geographical distribution of Macroplea spp. in China.

FIGURES 1 – 4. Macroplea huaxiensis sp. nov. 1. Holotype, male, dorsal view; 2. Paratype, male, ventral view; 3. Paratype, female, dorsal view; 4. Paratype, female, ventral view. Scale line = 5.0 mm.

FIGURES 24 – 27. Macroplea ranina sp. nov. 24. Paratype, male, dorsal view; 25. Paratype, male, ventral view; 26. Paratype, female, dorsal view; 27. Paratype, female, ventral view. Scale line = 5.0 mm.

FIGURES 50 – 53. Macraplea spp. 50. M. appendiculata from Xinjiang, male; 51. M. pubipennis from Ningxia, female; 52. M. japana from Jiangsu, female; 53. M. mutica from Tianjin, female. Scale lines = 5.0 mm.

FIGURES 5 – 20. Macroplea huaxiensis sp. nov. 5 – 13, 17, 18. Male; 14 – 16, 19, 20. Female. 5. Pronotum, dorsal view; 6. Head, dorsal view; 7. Head, lateral view; 8. Left elytron, middle part; 9. Right metatibia, lateral view; 10. Right metatarsus, lateral view; 11. Mouth parts, ventral view; 12. Apex of left elytron; 13. Antenna; 14. Pronotum, left lateral view; 15. Right metatibia, lateral view; 16. Left profemur, ventral view; 17, 19. Apical abdominal sternum; 18, 20. Pygidium. Scale lines: a = 0.5 mm. (Figs 5 – 10, 12, 14 – 20); b = 1.0 mm. (Fig. 13); c = 0.5 mm. (Fig. 11).

FIGURES 28 – 43. Macroplea ranina sp. nov. 28 – 35, 38 – 41. Male; 36, 37, 42, 43. Female. 28. Pronotum, dorsal view; 29. Head, dorsal view; 30. Mouth parts, ventral view; 31. Left elytron, middle part; 32. Head and prothorax, left lateral view; 33. Antenna; 34. Part of abdominal sternum, showing long setae; 35. Apex of left elytron; 36. Left profemur, ventral view; 37, 38. Right metatibia, lateral view; 39. Right metatarsus, lateral view; 40, 42. Apical abdominal sternum; 41, 43. Pygidium. Scale lines: d = 0.5 mm. (Figs 28, 29, 31 – 33, 35 – 43); e = 0.5 mm. (Figs 30, 34).

FIGURES 54 – 59. Head, prothorax and pronotum of Macroplea spp. 54 – 56. M. japana from Jiangsu; 57. M. pubipennis from Ningxia; 58. M. appendiculata from Xinjiang; 59. M. mutica from Tianjin; 54. Head and prothorax, lateral view; 55. Vertex, dorsal view; 56 – 59. Pronotum, dorsal view. Scale lines = 0.5 mm.

FIGURES 60 – 67. Elytron of Macroplea spp. 60, 64. M. japana from Jiangsu; 61, 65. M. pubipennis from Ningxia; 62, 66. M. appendiculata from Xinjiang; 63, 67. M. mutica from Tianjin. 60 – 63. Left elytron, middle part; 64, 66, 67. Apex of left elytron; 65. Apexes of both elytra. Scale lines = 0.2 mm.

FIGURES 68 – 71. Tarsus of Macroplea spp. 68. M. japana from Jiangsu; 69. M. pubipennis from Ningxia; 70. M. appendiculata from Xinjiang; 71. M. mutica from Tianjin. 68, 70, 71. Right metatarsus; 69. Left protarsus. Scale lines = 0.5 mm

FIGURES 21 – 23. Macroplea huaxiensis sp. nov. Paratype. 21 – 22. Medial lobe with endophallus in it (21. Dorsal view, 22. Lateral view); 23. Tegmen, dorsal view. Scale line = 0.5 mm.

FIGURES 44 – 49. Macroplea ranina sp. nov. 44, 45. Median lobe with endophallus in it (44. Dorsal view; 45. Lateral view.); 46. Tegmen, dorsal view; 47 – 49. Endophallus (47. Dorsal view; 48. Lateral view; 49. Ventral view). Scale lines: f = 0.5 mm. (Figs 44 – 46); g = 0.2 mm. (Figs 47 – 49).

FIGURES 72 – 75. Macroplea japana from Jiangsu. 72. Tegmen, dorsal view of cap; 73, 74. Median lobe with endophallus in it (73. Dorsal view; 74. Lateral view); 75. Endophallus in median lobe, dorsal view. Scale line = 0.5 mm.

FIGURES 76 – 78. Macroplea appendiculata from Xinjiang. 76. Tegmen, dorsal view; 77, 78. Median lobe with endophallus in it (77. Dorsal view; 78. Lateral view). Scale line = 0.5 mm.

FIGURES 79 – 84. Macroplea mutica from Tianjin. 79, 80. Median lobe without endophallus in it (79. Dorsal view; 80. Lateral view); 84. Tegmen, dorsal view; 81 – 83. Endophallus (81. Lateral view; 82. Dorsal review; 83. Ventral review). Scale line = 0.5 mm.