Globulosis flavus Short, García

Short, Andrew Edward Z., García, Mauricio & Girón, Jennifer C., 2017, Revision of the Neotropical water scavenger beetle genus Globulosis García, 2001 (Coleoptera: Hydrophilidae: Acidocerinae), Zootaxa 4232 (2), pp. 271-281 : 277-278

Globulosis flavus Short, García , & Girón sp. n.

Figs. 2 D–F, 3B, 5, 6, 7A, 8, 9.

Type material. Holotype (male): “ VENEZUELA: Amazonas State/ 5 48.141’N, 67 26.313’W, 80m / nr. Iboruwa: “Tobogancito”/ 13.i.2009; leg. A. Short et al./ VZ09-0113 - 02X ”, “[barcode]/ SEMC 0881820 / KUNHM-ENT” ( MIZA). Paratypes (9): VENEZUELA: Apure: ca. 6 km S. Rio Cinaruco, Road between Rio Orinoco & Rio Cinaruco , 8.i.2006, morichal and marsh along road, leg. Short, AS-06-019 (1, SEMC; voucher SLE527). Amazonas: ca. 12 km N. Samariapo, road between Puerto Ayacucho and Samariapo, 5°20' 29.8212"N, 67°45' 21.4806"W, 72 m , 6.i.2006, small stream in road culvert, leg. Short, AS-06-013 (2, SEMC). Bolívar: Los Pijiguaos , 6°35.671'N, 66°49.238'W, 80 m , 12.i.2009, margin of morichal, leg. Short, Camacho, Garcia, Joly, & Miller, VZ 09-0112-01A (5, MALUZ, SEMC; voucher SLE027); Rio Caripito , 6°35'12.984"N, 67°1'44.8356"W, detrital pool alongside river , 12.i.2009, leg. Short & Miller, VZ09-0112-02B (1, SEMC; voucher SLE528).

Differential diagnosis. The straight, parallel-sided parameres ( Fig. 7 A) and yellow to light brown dorsal coloration ( Fig. 2 D) serve to distinguish this species from G. hemisphericus , in which the outer margins of the parameres are curved along their entire length, and is darker in coloration.

Description. Total body length 1.9–2.3 mm. Dorsal coloration light brown to yellow ( Fig. 2 D). Thoracic and abdominal venter brown to dark brown ( Fig 2 F). Maxillary palps uniformly yellow ( Fig. 3 B). Aedeagus ( Fig. 7 A) with basal piece short, less than one third the length of the parameres; outer margins of parameres parallel-sided, with apex slightly curved inward. Median lobe broad, narrowing in apical third to an acute point, apex slightly lower than the apex of the parameres; gonopore situated in apical third.

Etymology. flavus , L., after the yellow coloration of the dorsum.

Distribution. Venezuela (Amazonas, Apure, Bolívar). The specimen from Apure, though in the llanos, was in a morichal (palm-lined stream) very close to the Orinoco River in an area that has an Amazonian influence.

Biology. This species has been collected along the margins of lotic habitats (e.g., Fig. 9 A).

Remarks. The northwest “shoulder” of the Guiana Shield where this species occurs has been found to harbor unique lineages of aquatic insects that have not been found elsewhere in the region, including Meruidae ( Spangler & Steiner 2005) and a lineage of Hydroscaphidae ( Short et al. 2015) . The reason for this apparent biogeographic distinctness is not well understood.

Figures

FIGURE 2. Habitus of Globulosis spp. G. hemisphericus (from Suriname): (A) dorsal, (B) lateral, (C) ventral; G. flavus (paratype): (D) dorsal, (E) lateral, (F) ventral. Scale bar 1 mm.

FIGURE 3. Head in frontal view of Globulosis spp. (A) G. hemisphericus, (B) G. flavus. Scale bar: 0.5 mm.

FIGURE 7. Aedeagus of Globulosis spp. (A) G. flavus sp. n. (holotype), (B) G. hemisphericus, reproduced from García, 2001, (C) G. hemisphericus from the upper Berbice, Guyana, (D) G. hemisphericus from Manaus, Brazil, (E) G. hemisphericus from Raleighvallen Nature Reserve, Suriname. Scale bar 0.05 mm.

FIGURE 9. Habitat of Globulosis sp. (A) Venezuela: Pijiguaos, collecting event VZ 09 - 0112 - 01 A, (B) Suriname: Kasikasima, collecting event SR 12 - 0320 - 02 A, (C) Suriname: Raleighvallen, collecting event SR 12 - 0727 - 03 A, (D) Suriname: near Kutari River, collecting event SR 12 - 0727 - 03 A.