Quadriops reticulatus Hansen, 1999

Giron, Jennifer C. & Short, Andrew Edward Z., 2017, Revision of the Neotropical water scavenger beetle genus Quadriops Hansen, 1999 (Coleoptera, Hydrophilidae, Acidocerinae), ZooKeys 705, pp. 115-141 : 124-126

Quadriops reticulatus Hansen, 1999 Figs 3 A–D, 5, 6B, 7 E–H, 9A

Quadriops reticulatus Hansen, 1999: 135

Type material examined.

Holotype (male): "COSTA RICA: Puntarenas/ Las Alturas (Stanford/ Biol. [Biological] Sta. [Station]) ca. 29km NE San/ Vito, 1500m, 27 May 1993/ J.S. & A.K. Ashe #063/ ex: flight intercept trap", "[Handwritten] HOLOTYPE/ Quadriops reticulatus / M. Hansen", "[Barcode]/ SEMC0965918/ KUNHM-ENT" (SEMC).

Additional material examined

(135 exs.). COSTA RICA: Cartago: 19.3 km NE San José, 17 May 1993, 1010 m, J. & A. Ashe, #105, ex: flight intercept trap (SEMC, 1); Tapanti National Park, 9.776711, -83.792778, Kiri Lodge, 14-19.vii.2011, leg. Short et al., Flight intercept trap, CR11-FIT-Z1-A1 (SEMC; voucher SLE 401). Guanacaste: Est. Pitilla, 9 km S. Sta. Cecilia, 700 m, P. N. Guanacaste, P. Ríos, Set. 1991 (INBIO, 1 male); same, 9-20 Nov 1993, C. Moraga, L N 330200_380200 #2449 (INBIO, 1); Heredia: 16 km SSE La Virgen, 1070 m, 10°16'N, 84°05'W, 11-20.ii.2001, 11/TN/08/003/ INBio-OET-ALAS transect// Barcodes: SEMC0859232-33 (SEMC, 2 males); same, 11/TN/09/004 // Barcodes: SEMC0859174, 184-185, 203, 206-207 (SEMC, 6 exs., incl. 3 females, 1 male); same, 11/TN/16/006 // Barcodes: SEMC0860054, 58, 68, 73-74, 76 (SEMC, 6 exs., incl. 4 females, 2 males); same, 11/TN/17/007 // Barcodes: SEMC0859642, 827, 836, 840 (SEMC, 4 exs., incl. 2 females, 1 male); same, 11/TN/20/010 // Barcodes: SEMC0860259, 272 (SEMC, 2 exs., incl. 1 female, 1 male); same, 10-21.iii.2001, 11/TN/06/011, // Barcodes: SEMC0859457, 469, 496, 498, 536 (SEMC, 5 males); same, 11/TN/07/012 // Barcodes: SEMC0859353, 363, 374, 385, 389, 599 (6 exs., incl. 2 females, 4 males); same, 11/TN/10/015 // Barcodes: SEMC0859524, 551 (SEMC, 2 exs., incl. 1 female [dissected], 1 male); same, 11/TN/16/016 // Barcodes: SEMC0859973, 975, 979, 0860000, 010, 012 (SEMC, 6 exs., incl. 4 females [SEMC0860000 dissected], 2 males [SEMC0859979 dissected]; same, 11/TN/18/018 // Barcodes: SEMC0859708, 712, 718, 721, 728-729, 733, 738-739, 750, 756, 765, 776, 783, 795 (SEMC, 15 exs., incl. 6 females [SEMC0859712 dissected], 6 males); same, 11/TN/19/019 // Barcodes: SEMC0860511, 515, 527, 531 (SEMC, 4 exs., (2 females, 2 males); same, 11/TN/20/020 // Barcode: SEMC0859935 (SEMC, 1 female); same, 10-21.iv.2001, 11/TN/07/022 // Barcodes: SEMC0860215-216, 220, 226, 233, 254 (SEMC, 6 exs., incl. 4 females, 1 male); 11/TN/08/023 // Barcodes: SEMC0859257, 264, 268-269 (SEMC, 4 exs., incl. 1 female, 2 males [SEMC0859268 and SEMC0859269 dissected]; same, 11/TN/16/026 // Barcodes: SEMC0859406-408, 419, 431, 437 (SEMC, 6 exs., 5 females, 1 dissected male [SEMC0859437]; same, 11/TN/17/027 // Barcodes: SEMC0860628, 630, 641, 652, 663 (SEMC, 5 exs., 1 female, 4 males); same, 11/TN/18/028 // Barcodes: SEMC0860126, 137, 146, 148, 152 (5 exs., 2 females, 3 males); same, 11/TN/19/029 // Barcodes: SEMC0859270, 273, 284, 306, 308, 314, 325 (SEMC, 7 exs., incl. 4 females, 2 males); same, 11/TN/20/030 // Barcodes: SEMC0860573, 599, 602, 606-607, 620, 624-625, 0892500, 502, 511, 578, 583, 590-591, 594 (SEMC, 16 exs., incl. 5 females [SEMC0860599, SEMC0860606 and SEMC0860620 dissected] 5 males [SEMC0860573 and SEMC0860607 dissected]; same, 11-20.iv.2001, 11/TN/18/008 // Barcodes: SEMC0859660, 663-664, 666, 675, 677, 683-684, 704 (SEMC, 9 exs., incl. 4 females, 1 male); same, 12-23.iii.2003, 05/TN/18/020 // Barcode: SEMC0860494 (1 female); same, 10-22.iii.2004, 03/TN/08/015 // Barcode: SEMC0860372 (SEMC, 1); Limón: Sector Cerro Cocori, Fca. de E. Rojas, 150 m, E. Rojas, Oct 1991 (INBIO, 1 male); Puntarenas: Monteverde Biological Preserve Peñas Blancas Valley- Aleman refugio, 25-29 May 1993, Steve Lingafelter, ex: flight intercept trap (SEMC, 1); Corcovado National Park, Sirena Stn., Corcovado Trail, 150 m, 8°29'7"N 83°34'39"W, 28 JUN– 1 JUL 2000, Z. H. Falin, CR1ABF00 059, ex: flight intercept trap // Barcodes: SM0251795 (SEMC, 1 male, dissected), SM0251874 (SEMC, 1 female, dissected), SM0252279 (SEMC, 1 female); Las Cruces Biol. Sta., 1330 m, 08°47.14'N 82°57.58'W, 28-30-V-2004, J. S. Ashe, Z. Falin, I. Hinojosa, ex: flight intercept trap, CR1AFH04 059 // Barcode: SM0625787 (SEMC, 1 male); Altamira Biol. Sta., 1510-1600 m, 09°01.76'N 83°00.49'W, 4-7-VI-2004, J. S. Ashe, Z. Falin, I. Hinojosa, ex: flight intercept trap, CR1AFH04 144 // Barcode: SM0659727 (SEMC, 1). PANAMA: Chiriqui: 20 Km N Gualaca, Finca La Suiza, 1350 m, 08°39'N, 82°12'W, 10 June 1995, J. Ashe & R. Brooks, #167, ex: fogging fungusy log (SEMC, 2 [1 male, dissected]); La Fortuna, "Hydro. Trail", 08°42'N, 82°14'W, 1150 m, 23 V– 9 VI 1995, J. Ashe, R. Brooks, #156, ex: flight intercept trap (SEMC, 2 [1 female]); Darién: Cana Biological Station, 550 m 7°45'18"N, 77°41'6"W, 07-09 Jun 1996, J. Ashe, R. Brooks, PAN1AB96 114, ex: flight intercept trap // Barcode: SM0049123 (SEMC, 1 female).

Differential Diagnosis.

Quadriops reticulatus is externally very similar to Q. depressus , and Q. similaris , as all have well defined longitudinal rows of serial punctures (as opposed to uniform and randomly distributed as in Q. acroreius and Q. dentatus ), and the serial punctures are conspicuously larger than the punctures on the interstrial surface (as opposed to similarly large as in Q. clusia , see Fig. 6). It can be separated from Q. depressus and Q. similaris by the dorsal outline of the body being uniformly convex (as opposed to flat), and the smooth surface of the pseudepipleura (as opposed to posteriorly markedly canaliculated, see Fig. 2C and G).

Redescription.

Body length 2.0-2.4 mm, width 1.2-1.45 mm. Body elongate oval, moderately convex, with dorsal outline only slightly flat. General coloration reddish to dark brown, with margins of pronotum and clypeus only slightly paler. Surface of clypeus, frons and pronotum reticulated. Elevation of mesoventrite with transverse ridge rather fine and curved (posteriorly concave). Elytra with ten well defined longitudinal rows of serial punctures; punctures on the interstrial surface noticeably smaller than serial punctures; surface of pseudepipleura anteriorly undulated, particularly at limit with epipleura, posteriorly smooth. Metafemora with pubescence only on anterior basal corner. Aedeagus (Fig. 7 E–H) with parameres as long as or longer than median lobe; parameres with outer margins slightly concave near midlength; apical 1/3 of inner margin of parameres concave; apical 1/3 of parameres digitiform, rather narrow, with rounded apex, slightly pointing towards longitudinal axis of aedeagus. Median lobe with lateral margins usually straight and clearly converging from base; apex of aedeagus widely rounded; gonopore variable in shape. Basal piece as long as 0.5 to 0.7-times the length of the median lobe, with lateral margins straight to sinuate; manubrium 0.3 to 0.6-times the length and clearly narrower than the basal piece at its base.

Variation.

The degree of sharpness of the transverse ridge of mesoventrite varies from being blunt and moderately marked to sharp. There is variation on the shape of the aedeagus, even though the overall shape is conserved across the species. Specimens from Panama tend to be smaller.

Distribution.

Costa Rica: Cartago, Heredia, Limón, Puntarenas; Panama: Chiriquí, Darién. See Fig. 9B.

Biology.

Most known specimens have been collected by using flight intercept traps. A few specimens were collected from "fungusy logs". Additionally, a disassociated note at INBio about one collecting event of Quadriops in Costa Rica indicated a series had been collected on the sap of freshly cut trees. Most Q. reticulatus specimens have been collected at elevations between 1000 and 1600 m.

Remarks.

The female specimen from the Darién of Panama has a differently shaped transversal ridge of the mesoventrite, but no other characters were found to differentiate it from Q. reticulatus . However, when males are found it may be shown to represent a distinct species. Several specimens were also observed to have mites on the dorsal surface of the elytra.