Cybocephalus randalli, T. R. Smith in T. R. Smith & Cave, 2006

Smith, Trevor Randall, 2022, Review of the Cybocephalidae (Coleoptera) of North America and the West Indies with descriptions of two new species of Cybocephalus Erichson, Insecta Mundi 2022 (950), pp. 1-35 : 22

Cybocephalus randalli T. R. Smith

( Fig. 120–130 )

Cybocephalus randalli T. R. Smith in Smith and Cave 2006a: 788–790.

Distribution. Throughout western North America, from Washington south to the tip of Baja California, Mexico, and as far east as Texas.

Hosts. Unknown.

Remarks. This species has wingless, reduced wing, and winged phenotypes similar to C. minimus Grouvelle , C. mauritiensis Vinson ( Vinson 1959) and C. seminulum Baudi ( Endrödy-Younga 1968). These three phenotypes are identical in almost all respects, including male genitalia. The only difference is the presence of fully developed hindwings, abbreviated hindwings, or absence of hindwings, and the metanotum’s shape. The wingless phenotype has a long metanotal process but is extremely reduced in the basal region, matching that of other wingless species ( Fig. 92 , 100 , 129 ), and both the reduced wing and winged phenotypes have a fully developed metanotum consistent with other winged species ( Fig. 111 , 119 , 130 ). The metanotum plays a significant role in hindwing muscle attachment and function, and therefore, metanotal morphology would be drastically different between winged and unwinged phenotypes. The wingless phenotype is most often collected in arid desert habitats, and series of hundreds of specimens have been collected in pitfall traps in Baja California, Mexico.

Figures

Figures 120–130. Cybocephalus randalli T. R. Smith. 120) Antenna, variant. 121) Antenna, variant. 122) Proleg. 123) Mesoleg. 124) Metaleg. 125) Median lobe. 126) Median lobe, lateral view. 127) Basal plate, variant. 128) Basal plate, variant. 129) Metanotum, wingless phenotype. 130) Metanotum, winged and reduced wing phenotypes.

Figures 85–92. Cybocephalus iviei T. R. Smith. 85) Antenna. 86) Proleg. 87) Mesoleg. 88) Metaleg. 89) Median lobe. 90) Median lobe, lateral view. 91) Basal plate. 92) Metanotum.

Figures 93–100. Cybocephalus kathrynae T. R. Smith. 93) Antenna. 94) Proleg. 95) Mesoleg. 96) Metaleg. 97) Median lobe. 98) Median lobe, lateral view. 99) Basal plate. 100) Metanotum.

Figures 101–111. Cybocephalus nigritulus LeConte. 101) Antenna. 102) Proleg. 103) Mesoleg. 104) Metaleg. 105) Median lobe, variant. 106) Median lobe, variant. 107) Median lobe, lateral view, variant. 108) Median lobe, lateral view, variant. 109) Basal plate, variant. 110) Basal plate, variant. 111) Metanotum.

Figures 112–119. Cybocephalus nipponicus Endrödy-Younga. 112) Antenna. 113) Proleg. 114) Mesoleg. 115) Metaleg. 116) Median lobe. 117) Median lobe, lateral view. 118) Basal plate. 119) Metanotum.