Strattis Pascoe, 1883

Devi, Salam Rita, Ray, D. C. & Ramamurthy, V. V., 2016, Descriptions of three new species of Strattis Pascoe, 1883 (Coleoptera: Curculionidae: Cryptorhynchinae) from the Indian subcontinent, Zootaxa 4085 (2), pp. 199-218 : 199-200

Strattis Pascoe

( Figs 3, 6, 9 , 16–18, 24, 27, 29, 35, 38, 40, 46, 51, 55, 59, 60, 66, 74, 75–80, 86, 91, 92, 94, 97, 102–105, 107, 111, 114–117, 119, 120, 121, 123–139)

Strattis Pascoe 1883:129 . Gender masculine. Type species: Strattis biguttatus Pascoe, 1883 , here designated. = Strattus Haly 1890: 153 . [Incorrect spelling]

Redescription. Body form ovate ( Figs 3, 6, 9 ). Rostrum 1/2 to 2/3 as long as pronotum ( Figs 103, 104 ); scrobes ventrolaterally set ( Figs 104 , 117 ). Scutellum bare (Figs 16–18, 119). Elytra with small glossy tubercles along median suture, just posterior to scutellum ( Fig. 120 ); interstria 9 not costate at base, stria 9 reaching base. Mesosternal receptacle transverse, not passing middle of meso-coxae ( Figs 91 , 102 , 114–116 ). Pro and meso-coxae almost contiguous ( Figs 91 , 102 , 114–116 ). Femora edentate, sulcate ventrally, with sulci bare ( Fig. 121 ); femora clavate, conspicuously narrowed basally ( Figs 75–77 ). Meso-tibiae with a small flange at base with an adjacent pitted area ( Figs 51 , 74 ). Abdominal suture between ventrites 1 and 2 weak and fine; ventrite 2 nearly as long as ventrites 3 and 4 combined ( Figs 78 , 91 , 102 ). Abdomino-femoral stridulatory structure present; stridulatory files present on the inner lateral aspect of meta-femora ( Figs 123 –139), stridulatory plectrum laterally on ventrite 1 ( Figs 123 124 , 128, 129 , 134, 135). Aedeagus always with Y or V shaped endophallic sclerite ( Figs 27 , 38 , 59 , 79 , 92 , 105 ). Tegmen with apodeme either absent or very small ( Figs 29 , 40 , 60 , 80 , 94 , 107 ). Female eighth sternite pouch shaped ( Figs 24 , 35 , 46 , 55 , 66 , 86 , 97 ).

Remarks. Since Pascoe did not designate a type species for this genus, the present study designates Strattis biguttatus Pascoe as the type species. This species was selected as the type species because it appears first following the generic description (as ratified by Article 69. A. 8–10 of the ICZN). Selection of this species also fits the characters given by Lyal (1993) and key characters by Morimoto (1978) as distinctive for the genus.

Lyal (1993) in his systematic description states that the genus Sympedius (which is divided into two groups: group I and group II) is morphologically close to Orochlesis and Strattis . The common characters that indicate a close relationship of these three genera are the form of mesosternal receptacles, presence of a small tooth or flange at the base of the meso-tibiae, generally with an adjacent pitted area, presence of a supra-uncal projection on the meta-tibiae and an inverted Y-shaped sclerite in the male endophallus of some species. He also states that Orochlesis and Sympedius group-I have a roughly striate area on either side of ventrite I and sculpture on the ventral side of the meta-femora, but these structures are not mentioned for Strattis .

In comparison with Sympedius , Strattis is more closely allied with group I based on its general body shape, head, rostrum, pronotum, elytral concavity, small glossy tubercles along median suture, just posterior to scutellum, and some structures of male and female genitalia. It can be distinguished from Sympedius as follows: antennae inserted medially or basally (in distal half in Sympedius ); scutellum bare, large and subquadrate (clothed with dense scales in Sympedius ); male tergite VII with microsetae (lacking in Sympedius ).

Strattis can be distinguished from Orochlesis by the following characters: interstria 9 of elytra costate at the base, forming outer margin of shoulder and joined with interstria 10 a little behind the base, whereas interstria 9 of elytra not costate at the base, stria 9 reaching the base in Strattis . Also, two species out of these three new species have a reduced tegminal apodeme, uniting them with the previously two described species by this apomorphic virtually complete reduction of the male tegminal apodeme. Strattis pascoei sp. nov. is only known from female specimens, but based on other characters it is grouped with the other two new species in Strattis .

Figures

FIGURES 1 – 9. Habitus (dorsal, ventral and lateral view) of Strattis Pascoe: Figs 1 – 3. S. pascoei sp. nov., Figs 4 – 6. S. maculatus sp. nov., Figs 7 – 9. S. srilankaiensis sp. nov.

FIGURES 100 – 112. Line illustration of S. vestigialis Pascoe: Fig. 100. Pronotum, Fig. 101. Antennae, Fig. 102. Adult, ventral view, Figs 103 – 104. Rostrum, dorsal and ventral, Figs 105 – 106. Aedeagus, dorsal and lateral, Fig. 107. Tegmen, Fig. 108. Spiculum gastrale, Fig. 109. Tergite VII, Fig. 110. Spermatheca, Fig. 111. Spiculum ventrale, Fig. 112. Tergite VII, Fig. 113. Tergite VIII.

FIGURES 114 – 122. SEM images: Figs 114 – 116. Mesosternal receptacle of: Fig. 114. S. pascoei sp. nov., Fig. 115. S. maculatus sp. nov., Fig. 116. S. srilankaiensis sp. nov.; Figs 117 – 120. S. srilankaiensis sp. nov., Fig. 117. lateral view of rostrum, Fig. 118. anapleural suture, Fig. 119. Scutellum, Fig. 120. Tubercles on scutellar suture; Fig. 121. S. maculatus sp. nov., meso-leg; Fig. 122. Tibial apex, showing uncus (UN) and mucrouncus (MUN).

FIGURES 89 – 99. Line illustration of S. biguttatus Pascoe: Fig. 89. Pronotum, Fig. 90. Antennae, Fig. 91. Adult, ventral view, Figs 92 – 93. Aedeagus, dorsal and lateral, Fig. 94. Tegmen, Fig. 95. Spiculum gastrale, Fig. 96. Spermatheca, Fig. 97. Spiculum ventrale, Fig. 98. Tergite VII, Fig. 99. Tergite VIII.

FIGURES 69 – 78. Line illustration of S. srilankaiensis sp. nov: Fig. 69. Pronotum, Fig. 70. Antennae, Fig. 71. Pro-tibial apex, Fig. 72. Meso-tibial apex, Fig. 73. Meta-tibial apex, Fig. 74. Basal portion of meso-tibae, Fig. 75. Pro-leg, Fig. 76. Meso-leg, Fig. 77. Meta-leg, Fig. 78. Abdomen.

FIGURES 49 – 57. Line illustration of S. pascoei sp. nov.: Fig. 49. Pronotum, Fig. 50. Antennae, Fig. 51. Basal portion of tibae, Fig. 52 Tibial apex, Fig. 53. Spermatheca, Fig. 54. Stylus, Fig. 55. Spiculum ventrale, Fig. 56. Tergite VII, Fig. 57. Tergite VIII.

FIGURES 123 – 127. Abdomino-femoral stridulatory organs of S. pascoei sp. nov., Fig. 123. Ventrite 1 (V 1) and ventrite 2 (V 2), showing their sculpturing differences, Fig. 124. Ridges on ventrite 1, which act as plectrum, Fig. 125. Meta-femora, showing the longitudinal convex area on the inner lateral aspect, Fig. 126. File like structures on convex ridge of femora; Fig. 127. Higher magnification of Stridulatory file.

FIGURES 128 – 133. Abdomino-femoral stridulatory organs of S. maculatus sp. nov., Fig. 128. Patches of plectrum-like ridges on ventrite 1, Fig. 129. Higher magnification of ridges on ventrite 1, Fig. 130. Meta-femora, inner lateral aspect; Fig. 131. Longitudinal convex area on inner lateral aspect, Fig. 132. File like structures on convex ridge of femora, Fig. 133. Higher magnification of stridulatory file.

FIGURES 27 – 37. Male and female genitalia of S. maculatus sp. nov.: Figs 27 – 28. Aedeagus, dorsal and lateral, Fig. 29. Tegmen, Fig. 30. Spiculum gastrale, Fig. 31. Tergite VII, Fig. 32. Tergite VIII, Fig. 33. Spermatheca, Fig. 34. Stylus, Fig. 35. Spiculum ventrale, Fig. 37. Tergite VII, Fig. 37. Tergite VIII.

FIGURES 38 – 48. Male and female genitalia of S. srilankaiensis sp. nov.: Figs 38 – 39. Aedeagus, dorsal and lateral, Fig. 40. Tegmen, Fig. 41. Spiculum gastrale, Fig. 42. Tergite VII, Fig. 43. Tergite VIII, Fig. 44. Spermatheca, Fig. 45. Stylus, Fig. 46. Spiculum ventrale, Fig. 47. Tergite VII, Fig. 48. Tergite VIII.

FIGURES 58 – 68. Line illustration of S. maculatus sp. nov.: Figs 58. Pronotum, Fig. 59. Aedeagus, Fig. 60. Tegmen, Fig. 61. Spiculum gastrale, Fig. 62. Tergite VII, Fig. 63. Tergite VIII, Fig. 64. Spermatheca, Fig. 65. Stylus, Fig. 66. Spiculum ventrale, Fig. 67. Tergite VII, Fig. 68. Tergite VIII.

FIGURES 79 – 88. Line illustration of male and female genitalia of S. srilankaiensis sp. nov: Fig. 79. Aedeagus, Fig. 80. Tegmen, Fig. 81. Spiculum gastrale, Fig. 82. Tergite VII, Fig. 83. Tergite VIII, Fig. 84. Spermatheca, Fig. 85. Stylus, Fig. 86. Spiculum ventrale, Fig. 87. Tergite VII, Fig. 88. Tergite VIII.

FIGURES 22 – 26. Female genitalia of S. pascoei sp. nov.: Fig. 22. Spermatheca, Fig. 23. Stylus, Fig. 24. Spiculum ventrale, Fig. 25. Tergite VII, Fig. 26. Tergite VIII.