Picobuthus, Lowe, 2010

Lowe, Graeme, 2010, New picobuthoid scorpions (Scorpiones: Buthidae) from Oman, Euscorpius 93 (93), pp. 1-53 : 23

Genus Picobuthus , gen. nov.

Type species. Picobuthus wahibaensis , sp. nov.

Diagnosis. A member of the picobuthoid group (see diagnosis above), differentiated as follows: small scorpions, adults <20 mm; metasoma ( Figs. 83–86 , 107–109 ): all segments finely granular; metasoma I–III with distinct carinae, IV with carinae reduced or obsolete, V only with dentate ventrolateral carinae; metasoma IV–V elongate, width equal to or narrower than metasoma I, ventral and lateral surfaces neither strongly convex nor smooth, lacking conspicuous pits or depressions; telson vesicle elongate, pyriform, not posteriorly truncate; pedipalp fixed finger weakly deflected upward at base, gently curved ( Figs. 75 , 99 ); tibial spurs absent on legs III–IV; retrosuperior margins of basitarsi I–III with bristle combs ( Figs. 68 , 92 ); fixed finger of chelicera armed ventrally with two denticles, distal denticle large, proximal denticle small ( Figs. 78 , 102 ); trichobothria ( Figs. 148–162 ): femur: 2 external, 3 dorsal (d 2 and d 5 absent) in β configuration (Vachon, 1975), 2–4 internal (either i 4, or i 2 and i 4 absent); patella: usually 5 external (esb 2 and em usually absent), 4 dorsal (d 2 absent), 1 internal; manus: 4 external (Eb 3 and Esb absent), 2 ventral; fixed finger: 6 (esb absent).

Subordinate taxa. P. dundoni , sp. nov., P. wahibaensis ,

Figures

Figures 77–86: Picobuthus wahibaensis, sp. nov. 77–78, paratype male (An Nuqdah); 80, 85–86, paratype female (An Nuqdah); 79, 81–84, holotype male. 77–78, right chelicera. 77. Dorsal aspect. 78. Ventral aspect. 79. Left male pectine, ventral aspect. 80. Left female pectine, ventral aspect. 81–82, right pedipalp chela movable finger terminus. 81. Dorsal aspect. 82. External aspect. 83–84, metasoma and telson of male. 83. Right lateral aspect. 84. Ventral aspect. 85–86, metasoma V and telson of female. 85. Right lateral aspect. 86. Ventral aspect. Scale bar: 77, 78, 81, 82: 0.347 mm; 79, 80: 0.72 mm; 83, 84, 85, 86: 1 mm.

Figures 101–109: Picobuthus dundoni, sp. nov. 101 – 102, paratype male (Adam); 106 – 107, paratype female (Wadi Andam); 103–105, 108–109, holotype male. 101–102, right chelicera. 101. Dorsal aspect. 102. Ventral aspect. 103–104, left pedipalp chela movable finger terminus. 103. Dorsal aspect. 104. External aspect. 105. Left male pectine, ventral aspect. 106. Left female pectine, ventral aspect. 107. Metasoma and telson of female, right lateral aspect. 108–109, metasoma and telson of male. 108. Right lateral aspect. 109. Ventral aspect. Scale bar: 101, 102, 103, 104: 0.53 mm; 105, 106: 1 mm; 107, 108, 109: 1.5 mm.

Figures 67–76: Picobuthus wahibaensis, sp. nov. 70–71, paratype male (An Nuqdah); 67–69, 72–76, holotype male. 67. Carapace, dorsal aspect. 68. Right basitarsus and telotarsus III, retrolateral aspect. 69. Right telotarsus III, ventral aspect. 70–71, right hemispermatophore, lobes at base of flagellum. 70. Convex aspect. 71. Outer aspect. 72. Right pedipalp femur, dorsal aspect. 73. Right pedipalp patella, dorsal aspect. 74. Right pedipalp patella, external aspect. 75–76, right pedipalp chela. 75. Dorsoexternal aspect. 76. Ventral aspect. Scale bar: 67: 1 mm; 68, 69, 72, 73, 74, 75, 76: 0.70 mm; 70, 71: 0.55 mm.

Figures 91–100: Picobuthus dundoni, sp. nov. 94–95, paratype male (Adam); 91 – 93, 96 – 100, holotype male. 91. Carapace, dorsal aspect. 92. Right basitarsus and telotarsus III, retrolateral aspect. 93. Right telotarsus III, ventral aspect. 94–95, right hemispermatophore, lobes at base of flagellum. 94. Convex aspect. 95. Outer aspect. 96. Right pedipalp femur, dorsal aspect. 97. Right pedipalp patella, dorsal aspect. 98. Right pedipalp patella, external aspect. 99–100, left pedipalp chela. 99. Dorsoexternal aspect. 100. Ventral aspect. Scale bar: 91: 1 mm; 92, 96, 97, 98, 99, 100: 0.75 mm; 93, 94, 95: 1 mm.

Figures 148–162: Trichobothrial maps of Picobuthus species. 148–155, P. wahibaensis, sp. nov., right pedipalp, 148, 151– 155: holotype male, 149–150: paratype males (East Wahiba Sands). 148–150. Femur, internal aspect. 151. Femur, dorsal aspect. 152. Patella, dorsal aspect. 153. Patella, external aspect. 154. Chela, external aspect. 155. Chela, ventral aspect. 156–162, P. dundoni, sp. nov., right pedipalp femur and patella, left pedipalp chela, 156, 158–162: holotype male, 157: paratype female (Wadi Qitbit). 156–157. Femur, internal aspect. 158. Femur, dorsal aspect. 159. Patella, dorsal aspect. 160. Patella, external aspect. 161. Chela, external aspect. 162. Chela, ventral aspect. Trichobothrial nomenclature after Vachon (1974), except for revised nomenclature in Figs. 126–127.