Eurhoptus imbricatus Anderson & Caterino

Anderson, Robert S. & Caterino, Michael S., 2018, A revision of the genus Eurhoptus LeConte, 1876 (Curculionidae, Cryptorhynchinae) of America north of Mexico, ZooKeys 787, pp. 37-80 : 62-64

Eurhoptus imbricatus Anderson & Caterino sp. n. Figures 8, 9

Description.

Body length (exclusive of head and rostrum) 2.3-3.0 mm, cuticle almost fully covered with broad, flat scales and scattered short, fine recurved (pronotum) to appressed (elytra) seta-like scales. Pronotum with lateral margins rounded, margins constricted at about apical one-third such that apical one-third is tubulate, greatest width at about basal one-third, not medially carinate; pale scales almost entirely covering pronotum to limited to midline and pair of lateral lines (giving some specimens a trivittate appearance). Elytra strongly rounded dorsally and laterally, striae distinct, of small punctures; all elytral intervals flat, each with single row of fine almost appressed seta-like scales; broad flat scales largely dark brown, approximate, scales pale and imbricate in an irregular oblique band across elytra in apical one-half, at bases of interval 3, at humeri and at elytral apex. Metaventrite medially impressed behind mesoventral cup. Abdomen with ventrite 1 with large median deep shining pit, base of pit with numerous erect, broad pale scales, scales somewhat condensed along midline in anterior portion of pit (giving a divided appearance); area around pit with dense, fine golden inwardly directed scales encircling depression. Legs with femora and tibiae fringed with dense erect scales along outer and inner margins, hind tibiae distinctly wider at about basal one-third. Aedeagus about as long as slightly less than one-half length of aedeagal apodemes, in lateral view slightly ventrally curved, in dorsal view with margins subparallel but gradually rounded towards apex at about apical one-quarter, apex produced medially as slight extension, broadly rounded at tip. Internal sac with apical sclerite complex with well-defined pair of hook-like sclerites.

Distribution

(Figure 9). This species is distributed in the Edwards Plateau region of central Texas, east into Louisiana and southern Arkansas.

Etymology.

We name this species " imbricatus " (L., an adjective or participle in the nominative singular, tiled, having adjacent edges overlapping) after the overlapping or imbricate scales of the oblique band on the elytra.

Variation.

There is some variation in the extent of the distribution of pale scales on the pronotum.

Specimens examined.

Holotype male (CMNC), labelled "USA: TX: Bandera Co. / 29.81958°N, 99.57066°W / Lost Maples St. Nat. Area / IV.28-30.1988, leaflit. / Berlese, R.S. Anderson", dissected. Extracted MSC2469 (unsuccessful). Paratypes (125): TEXAS: Bandera Co.: Lost Maples State Natural Area (29.81958, -99.57066), R.S. Anderson, 28-30 Apr 1988, berlese leaf litter (11, CMNC; 2, CNCI; 1, CWOB; 4, TMMC); Bandera Co.: Lost Maples State Natural Area (29.81958, -99.57066), R.S. Anderson, 28 Apr-2 May 1987, leaf / log litter (4, BMNH; 13, CMNC; 1, CWOB; 4 USNM); Bandera Co.: Lost Maples State Natural Area (29.82, -99.57), P.W. Kovarik, 21 Apr 1986, leaf litter (1, FSCA; 2, TAMU); Bandera Co.: Lost Maples State Natural Area (29.82, -99.57), P.W. Kovarik, 26 Apr 1986, leaf litter (2, TAMU); Bandera Co.: Lost Maples State Natural Area (29.82, -99.57), R.S. Anderson, 28-30 Apr 1988, leaf litter (1, CUAC); Bandera Co.: Lost Maples State Natural Area (29.82, -99.57), E.G. Riley, 27 Mar 1999, forest litter (1, EGRC); Bandera Co.: Lost Maples State Natural Area, Maple Trail (29.82, -99.57), C.W. O’Brien, 9 Mar 2001, leaf litter (5, CWOB); Bandera Co.: Lost Maples State Natural Area, Maple Trail (29.82, -99.57), C.W. O’Brien, 10 Mar 2001, leaf litter (8, CWOB); Bandera Co.: Lost Maples State Natural Area (29.82, -99.57), C.E. Carlton, 19 May 2005, forest litter (2, LSAM); Hays Co.: 9.66 km. N.W. Dripping Springs (30.226, -98.184), E.G. Riley, 24 Feb-30 Mar 2006, pitfall, Juniperus , unmanaged plot (2, EGRC); Hays Co.: 9.66 km. N.W. Dripping Springs (30.226, -98.184), E.G. Riley, 28 Apr-2 Jun 2006, FIT Juniperus , unmanaged plot (1, EGRC); Hays Co.: 9.66 km. N.W. Dripping Springs (30.226, -98.184), E.G. Riley, 31 arr-26 Apr 2006, FIT Juniperus , unmanaged plot (1, EGRC); Kerr Co.: 10.46 km. S.W. Hunt (29.99, -99.387), E.G. Riley, 28 Apr-2 Jun 2006, pitfall, upland deciduous forest (1, EGRC); Sabine Co.: 14.48 km. E. Hemphill 'Beech Bottom’ (31.38, -93.71), R.S. Anderson, 11 May 1988, beech/magnolia berlese (1, CUAC); Sabine Co.: 14.48 km. E. Hemphill 'Beech Bottom’ (31.38, -93.71), R.S. Anderson & E. Morris, 8 Mar 1989, beech/magnolia berlese (1, CUAC); Sabine Co.: 14.48 km. E. Hemphill 'Beech Bottom’ (31.38, -93.71), E. Riley & E. Morris, 24 Apr 1989, beech/magnolia berlese (1, CUAC); Sabine Co.: 14.48 km. E. Hemphill, Beech Bottom (31.386, -93.706), R.S. Anderson, 11 May 1988, litter, beech-magnolia forest (10, CMNC; 1, CWOB); Sabine Co.: 14.48 km. E. Hemphill, Beech Bottom (31.386, -93.706), R. Anderson; E. Morris, 8 Mar 1989, litter, beech-magnolia forest (9, CMNC; 1, CWOB); Sabine Co.: 14.48 km. E. Hemphill, Beech Bottom (31.386, -93.706), R. Anderson; E. Riley; E. Morris, 24 Apr 1989, litter, beech-magnolia forest (6, CMNC); Sabine Co.: 14.48 km. E. Hemphill, Beech Bottom (31.386, -93.706), E. Morris; R. Anderson, 18-26 Apr 1989, FIT, beech-magnolia forest (1, CMNC); Sabine Co.: 14.48 km. E. Hemphill, Beech Bottom (31.386, -93.706), E. Morris; R. Anderson, 9-16 Apr 1989, FIT, beech-magnolia forest (3, CMNC); Tyler Co.: 4.5 km. W., 3.05 km. N. Spurger, Big Thicket Natural Preserve, Beech Woods Trail (30.72, -94.227), R.S. Anderson, 12 May 1988, beech/magnolia leaf litter (6, CMNC); Travis Co.: vic. Long Hollow Creek (30.458, -97.875), 17 Mar 1994, E.G. Riley, berlese forest litter (2, TAMU); Travis Co.: vic. Long Hollow Creek (30.458, -97.875), 7 May 1994, E.G. Riley, berlese forest litter (3, TAMU); Tyler Co.: 4.5 km. W., 3.05 km. N. Spurger, Big Thicket Natural Preserve, Beech Woods Trail (30.72, -94.227), R.S. Anderson, 24 Apr 1988, beech/magnolia leaf litter (3, CMNC); Tyler Co.: Big Thicket National Preserve, 4.5 km. W, 3.05 km. N. Spurger, Beech Woods Trail (30.72, -94.23), R.S. Anderson, 24 Apr 1988, beech/magnolia berlese (1, CUAC); Tyler Co.: Highway 190 at FM 256 (30.76, -94.50), R.H. Turnbow Jr., 8 Feb 2003, berlese leaf litter (1, CWOB). ARKANSAS: Pike Co.: Crater of Diamonds State Park (34.04, -93.67), R.S. Anderson, 13 Aug 1988, hardwood berlese (1, CMNC). LOUISIANA: Calcasieu Par.: Sam Houston Jones State Park (30.3, -93.27), A. Cline; A. Tishechkin, 11 Feb 2002, leaf litter (2, CMNC); Evangeline Par.: Chicot State Park (30.8, -92.28), A. Tishechkin, 19 Feb 2004, berlese (1, CMNC); Evangeline Par.: Chicot State Park (30.794, -92.278), A.K. Tishechkin, 19 Feb 2004, berlese (1, CUAC); Madison Par.: Tallulah, Tensas National Wildlife Refuge (32.34, -91.34), S.T. Dash, 24 Mar 2004, leaf litter (1, CMNC); Natchitoches Par.: Kisatchie National Forest, Red Bluff Camp (31.5, -93.14), E. Riley; L. Prochaska, 1 Apr 1989, berlese beech/magnolia/pine litter (1, CMNC); Pointe Coupee Par.: Sam Houston Jones State Park (30.297, -93.259), 19 Feb 2003, A.R. Cline (1, CWOB).