Corixidea major McAtee & Malloch, 1925

Weirauch, Christiane, Hoey-Chamberlain, Rochelle & Knyshov, Alexander, 2018, Synopsis of Schizopteridae (Hemiptera, Heteroptera, Dipsocoromorpha) from the United States, with description of seven new species from the US and Mexico, ZooKeys 796, pp. 49-82 : 49

Corixidea major McAtee & Malloch, 1925 Figures 4, 5, 10

Material.

Type material. Holotype: male: USA: Tennessee: Montgomery Co.: Clarksville, 36.52972°N 87.35944°W, Aug 1915, G. A. Runner (UCR_ENT 00028582) (USNM).

Diagnosis.

Recognized among species of Corixidea by the uniformly dark coloration, macropterous forewing without pale band, presence of laterally directed tergum 8 process, and very small and rounded anophoric process.

Revised Description.

Male (Figure 4): macropterous, body length 1.36-1.58 mm; body elongate-oval. Coloration: general coloration dark brown to black, head, thorax, and costal area of the forewing dark brown to black, remainder of wing brown to dark brown, antenna and legs uniformly brown, abdomen dark brown to black. Surface and vestiture: head, pronotum and wing veins with short to medium-length light brown setae, abdomen densely covered with elongate, light brown setae, wing cells with distinct cell-like sculpture. Structure: Head: rounded in ventral view, width of eye ~1/3 width of synthlipsis, ocellus roughly equal in size to one ommatidium, positioned close to margin of compound eye. Thorax: pronotum trapezoidal, with posterior margin slightly curved posteriorly, scutellum triangular, with rounded tip, metepisternum with posterior margin rounded, blunt metasternal process widened apically, hind coxa with well-developed adhesive pad, tarsal formula 3-3-3, pretarsus with setiform parempodia, arolia present on fore- and midleg. Abdomen: with 5-6 visible sterna corresponding to segments 2+3 (if visible), 4, 5, 6, 7, and 9 (pygophore), sternum 2 longer than preceding sterna, weakly asymmetrical, terga of pregenital abdomen moderately sclerotized, tergum 7 rectangular or weakly trapezoidal, tergum 8 roughly rectangular with process and serrated patch on left side, process of tergum 8 with narrow base and widened apex, aligned with serrated patch on tergum, bearing spinous process. Genitalia: pygophore weakly asymmetrical, dorsoventrally flattened, with rounded apex, plane of parameres rotated at 90 degrees with respect to longitudinal body axis, right paramere straight, with robust base and elongate stem, left paramere much smaller than right, roughly as long as wide, aedeagus devoid of large conjunctival appendages, vesica forming 1¼ coils, with long slender process at midpoint of vesica, anophore well sclerotized and with small rounded process.

Female (Figure 4): macropterous, body length 1.42 mm, elongate-oval. Coloration, surface and vestiture: as in male. Structure: as in male but tarsal formula 2-2-3, arolia absent. Abdomen: with 4-5 visible sterna corresponding to segments 2+3 (if visible), 4, 5, 6, and 7; sternum 7 much longer than preceding sterna, symmetrical. Genitalia: ovipositor vestigial, spermathecal reservoir comma-shaped, spermathecal duct slightly longer than width of tergum 7, connected to left side of bursa copulatrix.

Notes.

Distinguished from other US Schizopteridae by a combination of relatively large size, blunt 3-segmented labium, absence of pronotal collar, presence of two triangular cells on costal margin of forewing (bordered by C+Sc, R+M, and R1, and C+Sc, R1, and R2), dorso-ventrally flattened pygophore with rounded apex, very long right paramere, and vesica with long subapical process. The genus Corixidea is a part of the Corixidea genus group, informally created by Emsley (1969), which also includes Hoplonannus McAtee & Malloch, 1925, Membracioides McAtee & Malloch, 1925, Oncerodes Uhler, 1894, Voccoroda Wygodzinsky, 1950, and Voragocoris Weirauch, 2012. Monophyly of the group is supported by the blunt labium, absence of a pronotal collar, venational similarities, and by limited molecular data when representatives of three genera were analyzed ( Knyshov et al. 2016). However, generic limits that were proposed based on morphological features are unclear when undescribed diversity of the group and the poorly described original species are considered. We are currently working on a revision of the Corixidea genus group (Knyshov et al. unpublished), which will contain a comprehensive diagnosis of C. major in view of potential taxonomic changes within the group.

Other specimens examined.

USA: Florida: Alachua Co.: Gainesville, 29.63527°N 82.37111°W, 24 m, 12 Jun 1966 - 15 Jun 1966, Ladonia O’Berry, 1 female (UCR_ENT 00011922) (FSCA). Broward Co.: Everglades National Park, 25.4775°N 80.96085°W, 24 Aug 1949 - 25 Aug 1949, H. S. Dybas, 1 male (UCR_ENT 00090856) (FMNH). Collier Co.: Florida: Collier Co. Immokalee, 26.41853°N 81.41741°W, 24/IV/2014-1/IV/2014, Susan Halbert, 4 males (UCR_ENT 00012031, UCR_ENT 00012032) (FSCA); 07 Jun 2007 - 14 Jun 2007, Selina Estrada, 1 female (UCR_ENT 00011920) (FSCA); 15 Mar 2012 - 22 Mar 2012, Scott Croxton, 1 female (UCR_ENT 00011918) (FSCA); 08 Nov 2012 - 15 Nov 2012, Scott Croxton, 1 female (UCR_ENT 00011919) (FSCA); 21 Feb 2013 - 28 Feb 2013, Scott Croxton, 1 male (UCR_ENT 00011921) (FSCA); 02 Jan 2014 - 09 Jan 2014, Susan Halbert, 1 male (UCR_ENT 00011867) (FSCA). Immokalee, 26.40611°N 81.41389°W, 13 Jul 2013 - 20 Jul 2013, Susan Halbert, 1 male (UCR_ENT 00011912) (FSCA); 20 Jul 2013 - 27 Jul 2013, Susan Halbert, 2 males (UCR_ENT 00011910, UCR_ENT 00011911) (FSCA); 14 Oct 2013 - 21 Nov 2013, Susan Halbert, 1 female (UCR_ENT 00011868) (FSCA); 07 Nov 2013 - 14 Nov 2013, Susan Halbert, 2 males (UCR_ENT 00011857), 1 female (UCR_ENT 00011858) (FSCA); 05 Dec 2013 - 12 Dec 2013, Susan Halbert, 1 female (UCR_ENT 00011866) (FSCA); 16 Jan 2014 - 23 Jan 2014, Susan Halbert, 1 male (UCR_ENT 00011864) (FSCA); 30 Jan 2014 - 06 Feb 2014, Susan Halbert, 1 male (UCR_ENT 00011865) (FSCA); 13 Mar 2014 - 20 Mar 2014, Susan Halbert, 1 female (UCR_ENT 00012026) (FSCA); 20 Mar 2014 - 22 Mar 2014, Susan Halbert, 2 males (UCR_ENT 00012027, UCR_ENT 00012028) (FSCA); 03 Apr 2014 - 10 Apr 2014, Susan Halbert, 1 male (UCR_ENT 00012029), 1 female (UCR_ENT 00012030) (FSCA); 01 May 2014 - 08 May 2014, Susan Halbert, 5 males (UCR_ENT 00012033-UCR_ENT 00012037) (FSCA); 22 May 2014 - 29 May 2014, Susan Halbert, 1 male (UCR_ENT 00012038) (FSCA); 29 May 2014 - 05 Jun 2014, Susan Halbert, 1 female (UCR_ENT 00012041), 1 male (UCR_ENT 00012042) (FSCA); 05 Jun 2014 - 12 Jun 2014, Susan Halbert, 1 male (UCR_ENT 00012039), 1 female (UCR_ENT 00012040) (FSCA); 03 Jul 2014 - 10 Jul 2014, Susan Halbert, 2 females (UCR_ENT 00012043, UCR_ENT 00012044) (FSCA); 10 Jul 2014 - 17 Jul 2014, Susan Halbert, 4 males (UCR_ENT 00012045-UCR_ENT 00012047, UCR_ENT 00012049), 1 female (UCR_ENT 00012048) (FSCA). Highlands Co.: Parker Islands 7 mi. S.E. of Lake Placid, 27.24476°N 81.29812°W, 13 Jun 1955, H. S. Dybas, 1 female (UCR_ENT 00090857) (FMNH). Hillsborough Co.: Hillsborough River State Park, 28.10735°N 82.27178°W, 07 Feb 1958, F. W. Mead, 1 female (UCR_ENT 00011923) (FSCA). Louisiana: Vermilion Co.: Gueydan, 30.03059°N 92.50833°W, 01 Jul 1925, E. R. Kalmbach, 1 male (UCR_ENT 00026654) (USNM). Oklahoma: Latimer Co.: Latimer County, no specific locality, 34.83503°N 95.31025°W, Jul 1989, Karl Stephan, 2 females (UCR_ENT 00011924, UCR_ENT 00011925), 1 male (UCR_ENT 00011926) (FSCA); Jun 2002, K. Stephan, 2 males (UCR_ENT 00093519, UCR_ENT 00093517) (TAMU); Jul 2002, K. Stephan, 3 females (UCR_ENT 00093528, UCR_ENT 00093527, UCR_ENT 00093510), 4 male (UCR_ENT 00093512, UCR_ENT 00093511, UCR_ENT 00093508, UCR_ENT 00093509) (TAMU); Aug 2002, K. Stephan, 1 female (UCR_ENT 00093516), 4 males (UCR_ENT 00093518, UCR_ENT 00093505-UCR_ENT 00093507) (TAMU). Texas: Brazos Co.: College Station, 30.62778°N 96.33417°W, 03 May 1978 - 09 May 1978, J. A. Jackman, Light Trap, 1 male (UCR_ENT 00094213) (TAMU). College Station, Lick Creek Park, 30.57755°N 96.29052°W, 04 Oct 1987 - 18 Oct 1987, R. Wharton, 1 female (UCR_ENT 00094184) (TAMU). Cameron Co.: Sabal Palm Grove Sanctuary, 25.85016°N 97.4244°W, 16 Oct 1993, Backmon, Quinn & Riley, 1 male (UCR_ENT 00094182), 1 female (UCR_ENT 00094183) (TAMU). Wood Co.: Little Sandy National Wildlife Refuge, 32.57611°N 95.24722°W, 19 Sep 1998, J.D. Oswald, 10 males (UCR_ENT 00094214, UCR_ENT 00094215, UCR_ENT 00093514, UCR_ENT 00093520-UCR_ENT 00093526), 3 females (UCR_ENT 00094216, UCR_ENT 00093513, UCR_ENT 00093515) (TAMU).