Antillocladius calakmulensis, Humberto F. Mendes, Trond Andersen & Ole A. Saether, 2004

Humberto F. Mendes, Trond Andersen & Ole A. Saether, 2004, A review of Antillocladius Saether, 1981; Compterosmittia Saether, 1981 and Litocladius new genus (Chironomidae, Orthocladiinae), Zootaxa 594, pp. 1-82 : 32-34

Antillocladius calakmulensis new species

( Fig. 4 A–G)

Type material: Holotype male, MEXICO: Campeche Province, Reserve Biosphere Calakmul, Campamento Carola, 20.ix.1997, A. Contreras­Ramos et al. ( ZMBN Type no. 398, slide mounted in Canada balsam).

Diagnostic characters: The male imago can be separated from other members of the genus by having a virga consisting of 6 short spines; apical setae on the wing membrane; squama with a few setae ; short costal extension; scalpellate acrostichals in the middle of scutum; anal point long and triangular, with strong lateral setae ; and inferior volsella prominent with anterior digitiform projection equally long as and partly covering rounded posterior lobe.

Etymology: Named after the Reserva Biosphere Calakmul in SE Mexico, using the Latin suffix, – ensis, denoting the place of origin.

Male (n = 1).

Total length 2.13 mm. Wing length 1.14 mm. Total length / wing length 1.86. Wing length / length of profemur 2.55. Coloration brown, thorax dark brown, tarsi of all legs light brown.

Head. ( Fig. 4 A) AR 1.27, ultimate flagellomere 396 µm long. Temporal setae 9, including 3 inner verticals, 1 outer vertical and 5 postorbitals. Clypeus with 9 setae . Tentorium, stipes and cibarial pump as in Fig. 4 B; tentorium 121 µm long, 22 µm wide at sieve pore; stipes 121 µm long, 35 µm wide. Palpomere lengths in µm: 28, 40, 76, 73, 97. Third palpomere apparently with 1 sensillum clavatum subapically, 10 µm long.

Thorax ( Fig. 4 C). Antepronotum with 2 setae . Dorsocentrals 10; acrostichals 13, all scalpellate starting some distance from antepronotum; prealars 5, supraalar 1. Scutellum with 8 setae .

Wing ( Fig. 4 D). VR 1.32. Costal extension 22 µm long. Brachiolum with 1 seta, M1+2 with 3 setae , other veins bare. Wing membrane with 16 setae in cell r4+5. Squama with 5 setae .

Legs. Spur of front tibia 54 µm long, spurs of middle tibia 29 µm and 26 µm long, spurs of hind tibia 35 µm and 19 µm long. Width at apex of front tibia 32 µm, of middle tibia 33 µm, of hind tibia 40 µm. Hind tibial comb with 12 setae , shortest seta 12 µm long, longest seta 35 µm long. Lengths (in µm) and proportions of legs as in Table 4 .

Hypopygium ( Fig. 4 E–G). Anal point 59 µm long, 33 µm wide at base, with 20 strong lateral setae , void of microtrichia except at base. Laterosternite IX with 5 setae . Phallapodeme 76 µm long. Transverse sternapodeme arcuate, with rounded oral projections, 69 µm long. Virga consisting of 6 spines, 25 µm long. Gonocoxite 137 µm long, with long, low inferior volsella, with rounded projection orally. Gonostylus 86 µm long, megaseta 12 µm long. HR 1.60, HV 2.48.

Figures

FIGURE 4. Antillocladius calakmulensis new species, male imago. A – head; B – cibarial pump, tentorium and stipes; C – thorax; D – wing; E – anal point and tergite IX and dorsal aspect of left gonocoxite; F – hypopygium with anal point and tergite IX removed, left dorsal aspect, right ventral aspect; G – gonostylus.

Tables

TABLE 4. Lengths (in µm) and proportions of legs of Antillocladius calakmulensis new species.

	fe	ti	ta1	ta2	ta3	ta4	ta5	LR	BV	SV	BR
p1	449	507	378	221	147	90	57	0.74	2.59	2.54	2.7
p2	449	466	212	123	87	49	41	0.46	3.83	4.31	2.8
p3	507	580	327	229	139	74	41	0.56	2.93	3.33	6.5