Calyxochaetus frontalis

Runyon, Justin B., 2024, Revision of the genus Calyxochaetus Bigot (Diptera: Dolichopodidae: Sympycninae), Zootaxa 5539 (1), pp. 1-74 : 50

Calyxochaetus frontalis species group

Diagnosis. The C. frontalis species group is defined by males having fore tarsomere 1 very short ( Figs 116–119 ) and mid tarsomere 2 with apex widened and pointed anteroapically ( Figs 120–131 ). Mid tarsomeres 3–4 are short and sometimes modified in shape. Males often have the hind tibia with specialized ventral seta(e) near base ( Figs 132–136 ). Scutellum usually with distinct blue-violet reflections.

Remarks. Most species occurring in Mexico and Central America are in this group.

Figures

FIGURES 104–119. Male antennae (lateral view) and forelegs of the Calyxochaetus frontalis species group. 104. C. binodatus (Harmston & Knowlton). 105. C. nodatus (Loew). 106. C. desertus sp. nov. 107. C. pictipes (Harmston & Knowlton). 108. C. sobrinus (Wheeler). 109. C. ornatus Parent. 110. C. remifer sp. nov. 111. C. tohono sp. nov. 112. C. frontalis (Loew). 113. C. furcatus (Van Duzee). 114. C. lamellicornis Parent (photo by Emmanuel Delfosse, MNHN). 115. C. lacrima sp. nov. 116. C. binodatus, fore tarsus, anterior view. 117. C. sobrinus, fore tarsus, anterior view. 118. C. remifer sp. nov., fore tarsus, dorsal view. 119. C. lacrima sp. nov., fore tibia and tarsus, posterior view. Scale bars = 0.5 mm; arista-like styli approximately 1 mm long.

FIGURES 120–131. Male mid tarsi of the Calyxochaetus frontalis species group (anterior on left side). 120. C. binodatus (Harmston & Knowlton), dorsal view. 121. C. nodatus (Loew), ventral view. 122. C. bovanodatus sp. nov., dorsal view. 123. C. desertus sp. nov., mid tarsomeres 2–5, dorsal view. 124. C. sobrinus (Wheeler), mid tarsomeres 2–5, dorsal view. 125. C. pictipes (Harmston & Knowlton), dorsal view. 126. C. ornatus Parent, mid tarsomeres 2–5, ventral view. 127. C. tohono sp. nov., mid tarsomeres 2–5, dorsal view. 128. C. remifer sp. nov., dorsal view. 129. C. frontalis (Loew), dorsal view. 130. C. furcatus (Van Duzee), dorsal view. 131. C. lacrima sp. nov., dorsal view. Scale bars = 0.5 mm.

FIGURES 132–138. Male hind legs and wings of the Calyxochaetus frontalis species group. 132. C. binodatus (Harmston & Knowlton), hind tibia, anterior view. 133. C. nodatus (Loew), hind tibia, anterior view. 134. C. ornatus Parent, hind tibia, posterior view. 135. C. frontalis (Loew), hind tibia, posterior view. 136. C. lacrima sp. nov., apical third of hind femur and basal half of hind tibia, posterior view. 137. C. nodatus, wing. 138. C. ornatus, wing. Scale bars = 1.0 mm.