Eurhoptus cariniventris 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 : 72-75

Eurhoptus cariniventris Anderson & Caterino sp. n. Figures 9, 14

Eurhoptus pyriformis (part); Blatchley and Leng 1916: 497; Kissinger 1964: 64; Papp 1979: 164; O’Brien and Wibmer 1982: 136; Downie and Arnett 1996: 1581; Alonso-Zarazaga and Lyal 1999: 131; Anderson 2002: 765.

Description.

Body length (exclusive of head and rostrum) 1.8-2.4 mm, cuticle largely bare, variously covered with short, fine recurved seta-like scales, most specimens lacking other scales but some with head and base of rostrum scaly and with a few broad, flat pale scales variously arranged on elytra in apical one-half and at bases of intervals 2-4. Pronotum with lateral margins straight, margins tapered more or less evenly from base to apex with greatest width at base, medially carinate or not. Elytra strongly rounded dorsally and laterally, almost globular, striae distinct, of very large punctures, especially in posthumeral region; all elytral intervals evenly elevated, slightly rounded, each with single row of fine recurved seta-like scales. Metaventrite medially distinctly carinate behind mesoventral cup. Abdomen with ventrite 1 with large median deep glabrous shining pit, area around pit with dense, fine golden inwardly directed scales encircling depression. Legs with femora and tibiae fringed with erect scales along outer margin of tibiae, hind tibiae subequal in width throughout most of length to slightly wider at basal one-third. Aedeagus about as long as one third length of aedeagal apodemes, in lateral view almost straight, in dorsal view with margins subparallel but strongly tapered towards apex at about midlength, apex produced medially as fine acuminate point. Internal sac with distinct apical sclerite complex of pair of longitudinal parallel bars.

Distribution

(Figure 9). This species is distributed throughout central Texas and appears to be disjunct to the panhandle of Florida and adjacent Alabama and Georgia. All published Texas records of E. pyriformis are this species.

Etymology.

We name this species " cariniventris " (L., an adjective or participle in the nominative singular, carina, keeled, and ventris, belly) after the distinctly carinate metaventrite posterior to the mesoventral cup.

Variation.

This species appears to have two disjunct portions of its range; central Texas and Florida panhandle and adjacent Alabama into eastern Georgia. We know of no specimens from the intervening areas. Specimens from Florida/Alabama have larger, deeper elytral punctures (especially in the posthumeral area) but have similar male genitalia and do not differ in other structural characters. At present, we consider these eastern specimens to be conspecific with the Texas specimens but have excluded them from the type series.

Specimens examined.

Holotype male (CMNC), labelled "TEX: Bandera Co. / Lost Maples St. Nat. Area / 28.IV.-2.V.87 R. Anderson / Berlese leaf/log litter", dissected. Paratypes (312): TEXAS: Bandera Co.: Lost Maples State Natural Area (29.82, -99.57), R.S. Anderson, 28 Apr-2 May 1987, leaf/log litter (42, CMNC; 5, CNCI; 1, CUAC; 5, CWOB; 1, UCFC); Bandera Co.: Lost Maples State Natural Area (29.82, -99.57), R.S. Anderson, 28-30 Apr 1988, leaf litter (42, CMNC; 1, CUAC; 5, CWOB); Bandera Co.: Lost Maples State Natural Area (29.82, -99.57), C.E. Carlton, 19 May 2005, forest litter (2, LSAM); Bandera Co.: Lost Maples State Natural Area, East Trail to pond (29.82, -99.58), C.W. O’Brien, 9 Mar 2001, sifted mixed hardwood litter (2, ASUIC); Bandera Co.: Lost Maples State Natural Area, Maple Trail (29.82, -99.57), C.W. O’Brien & Gages, 10 Mar 2001, sifted mixed hardwood litter (1, ASUIC); Bandera Co.: Lost Maples State Natural Area (29.82, -99.57), E.G. Riley, 24 Apr 2005, berlese maple forest litter (1, EGRC); Bandera Co.: Lost Maples State Natural Area (29.82, -99.57), E.G. Riley, 11 May 1997, forest litter (2, EGRC); 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 (29.82, -99.57), P.W. Kovarik, 21 Apr 1986, leaf litter (1, TAMU); Bandera Co.: Lost Maples State Natural Area (29.82, -99.57), P.W. Kovarik, 26 Apr 1986, leaf litter (12, TAMU); Bandera Co.: Lost Maples State Natural Area (29.82, -99.57), P.W. Kovarik, 10 May 1986, leaf litter (3, TAMU); Bastrop Co.: Buescher State Park (30.041, -97.162), R.S. Anderson, 3 May 1988, leaf litter berlese (15, CMNC); Bastrop Co.: Buescher State Park (30.041, -97.162), R.S. Anderson, 3 May 1988, leaf litter (1, CUAC); Blanco Co.: Pedernales Falls State Park, Nature Trail (30.306, -98.256), R.S. Anderson, 3 May 1988, oak/elm/juniper litter (10, CMNC); Colorado Co.: 2 mi S Columbus (29.6, -96.5), C.W. O’Brien & G.J. Wibmer, 12 Dec 1984, sifted hardwood litter (1, ASUIC); Colorado Co.: Columbus (29.7065, -96.5353), R.S. Anderson, 17 May 1987, riparian ravine hardwood litter (1, CUAC); Colorado Co.: Columbus (29.7065, -96.5353), R.S. Anderson, 1 Feb 1989, riparian ravine hardwood litter (1, CUAC); Colorado Co.: Columbus (29.7072, -96.5344), R.S. Anderson, 1 Feb 1988, riparian ravine litter (25, CMNC); Colorado Co.: Columbus (29.7072, -96.5344), R.S. Anderson, 22 Mar 1988, riparian ravine litter (8, CMNC); Colorado Co.: Columbus (29.7072, -96.5344), R.S. Anderson, 4 Nov 1988, riparian ravine litter (33, CMNC); Colorado Co.: Columbus (29.7072, -96.5344), R.S. Anderson, 21 Feb 1989, riparian ravine litter (10 BMNH; 31, CMNC; 1, CUAC; 10 CWOB; 10, TAMU; 5, TMMC; 10 USNM); Colorado Co.: Columbus (29.7065, -96.5353), C.V. Riley, 24 Aug 1929 (1, CWOB); Fort Bend Co.: Brazos Bend State Park (29.37, -95.63), B. Raber & E.G. Riley, 15 Jun 2000, FIT (1, EGRC); Travis Co.: Austin, Mayfield Park (30.3126, -97.771), R. Jones, 15 Apr 1989, leaf litter (10, CMNC); Travis Co.: Austin, Brackenridge Field Lab (30.284, -97.778), E.G. Riley, 10 Feb 1996, berlese rotten pecan log (1, EGRC).

Excluded from type series: ALABAMA: Dale Co.: Fort Rucker Military Reserve (31.29, -85.72), R. Turnbow, 31 Mar 1993, leaf litter (1, CMNC); Dale Co.: Fort Rucker Military Reserve (31.29, -85.72), R. Turnbow, 27 Sep 1991, leaf litter (1, CMNC); Dale Co.: Fort Rucker (31.349, -85.711), R.H. Turnbow, Jr., 27 Oct 2001 (1, CWOB). FLORIDA: Gadsden Co.: 4 mi SE Havana, junction Co. Rd. 153 & Ochlokonee River (30.58, -84.36), C.W. O’Brien & G.B. Marshall, 23 Mar 2001, sifted hardwood litter (1, ASUIC; 3, CWOB); Gilchrist Co.: Hart Springs (29.675, -82.951), L.R. Davis Jr., 23 Apr 1993 (1, CWOB); Jackson Co.: Florida Caverns State Park (30.812, -85.225), P.E. Skelley, 8 Apr 1994, leaf litter around rock outcroppings, cave area (4, CMNC; 2, CWOB; 3 FSCA); Liberty Co.: TNC Apalachicola Bluffs & Ravines Preserve, Travelers Tract (30.46, -84.98), P.E. Skelley, 23 Mar 1996, leaf litter (3, ASUIC); Liberty Co.: Okaloosa Co.: Milligan (30.752, -86.64), G.B. Marshall, 21 Apr 1977 (2, CWOB); Torreya State Park (30.56, -84.96), R. Turnbow, 25 Jun-8 Jul 1989, pitfall (2, FSCA); Liberty Co.: Torreya State Park (30.56, -84.96), C.W. O’Brien & G.B. Marshall, 23 Mar 2001, berlese beech litter (2, CWOB). GEORGIA: Tatnall Co.: Big Hammock Natural Area, 19.3 km. S.W. Glennville (31.863, -82.058), C.W. O’Brien & P. Kovarik, 20 Mar 1999, live oak, mixed hardwood litter (1, CWOB).