Gravatamberus guatemaltecus, Mendes & Andersen, 2008

Mendes, Humberto Fonseca & Andersen, Trond, 2008, A review of Antillocladius Saether and Litocladius Mendes, Andersen et Saether, with the description of two new Neotropical genera (Diptera, Chironomidae, Orthocladiinae), Zootaxa 1887 (1), pp. 1-75 : 47-49

Gravatamberus guatemaltecus sp. n.

( Figs 53–57 )

Type material: Holotype male, GUATEMALA: Santa Rosa: Pueblo Nueve Viñas, Finca Maria Mundo, Bosque Pino-Eucino , 1800 m a.s.l., 9.xi.1999, Malaise trap, A.C. Baily & J. Monzon ( ZMBN).

Diagnostic characters: The species can be separated from all other members of the genus by having more than 10 setae in cell m proximal to RM, costal extension ending close to wing tip, and AR lower than 0.50.

Etymology: From Spanish guatemalteco, a native of Guatemala; the name is to be regarded as a noun in apposition.

Male (n = 1). Total length 1.45 mm. Wing length 1.23 mm. Total length / wing length 1.17. Wing length / length of profemur 2.53. Coloration brown; thorax dark brown with markings on preepisternum, median anepisternum and notum; legs and tarsi uniformly light brown.

Head. AR 0.26. Ultimate flagellomere 112 µm long, stout subapical seta 40 µm long. Temporal setae 9, including 4 inner verticals, 3 outer verticals, and 2 postorbitals. Clypeus with 13 setae. Tentorium, stipes, and cibarial pump as in Figure 53 . Tentorium 91 µm long, 18 µm wide. Stipes 95 µm long. Palp segment lengths (in µm): 18, 27, 82, 95, fifth palpomere not measurable. Third palpomere with 2 sensilla clavata subapically, longest 14 µm long.

Thorax ( Fig. 54 ). Antepronotum with 5 setae. Dorsocentrals 18; acrostichals 6, all scalpellate; prealars 6, extended anteriorly; no supraalar. Scutellum with 2 setae.

Wing ( Fig. 55 ). VR 1.33. C extension 161 µm long. Brachiolum with 1 seta, Sc with 16 seta, C extension with 23 non-marginal setae, R with 15 setae, R 1 with 11 setae, R with 20 setae, M 1+2 with 45 setae, M 3+4 with 24 setae, Cu with 17 setae, Cu 1 with 14 setae, PCu with 36 setae, An with 20 setae. Cell m with 19 setae, r with 224 setae, m 1+2 with 223 setae, m 3+4 with 96 setae, cu + an with 227 setae.

4+5

4+5

Legs. Spur of foretibia 29 µm long, spurs of midtibia 32 µm and 16 µm long, spurs of hind tibia 39 µm and 18 µm long. Width at apex of foretibia 23 µm, of midtibia 25 µm, of hind tibia 32 µm. Comb with 10 setae, longest 36 µm, shortest 16 µm long. Lengths and proportions of legs as in Table 10.

Hypopygium ( Figs 56–57 ). Tergite IX with 2 setae, laterosternite IX with 5 setae. Phallapodeme 57 µm long, transverse sternapodeme 57 µm long. Gonocoxite 120 µm long. Gonostylus 57 µm long, megaseta 7 µm long. HR 2.12, HV 2.55.

Distribution: This species is known only from the type locality in Guatemala.

Figures

FIGURES 53–57. Gravatamberus guatemaltecus sp. n., male. 53—tentorium, stipes, and cibarial pump; 54—thorax; 55—wing; 56–anal point and tergite IX and dorsal aspect of left gonocoxite and gonostylus; 57—hypopygium with anal point and tergite IX removed, dorsal aspect to the left and ventral aspect to the right.