Cerodontha (Dizygomyza) nigrihalterata, Boucher, Stéphanie, 2005

Boucher, Stéphanie, 2005, Description of an unusual new Costa Rican species of Cerodontha (Dizygomyza) with additional notes on Neotropical species of Dizygomyza (Diptera: Agromyzidae), Zootaxa 993, pp. 1-8: 3-4

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http://doi.org/ 10.5281/zenodo.171388

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scientific name

Cerodontha (Dizygomyza) nigrihalterata

sp. nov.

Cerodontha (Dizygomyza) nigrihalterata  sp. nov.

( Fig. 1–7View FIGURES 1 – 7)

Type material: Holotype. Male. COSTA RICA: Puntarenas: Golfito, R.F. Golfo Dulce, Estación Agujas, Sendera Ajo, 250– 350m. 2 Nov 1998. M. Umana. Manual. L_S_ 276750 _ 526550 # 56934, INB0003308651( INBIO)

Paratypes. COSTA RICA: Puntarenas: Est. Agujas. Send. Elvia. 300m. 3 Nov 1998. J. Matarrita, I. Lopez, J. Gutierrez. L_S_ 276750 _ 526550 # 51810 INB0003021049 (1 M, INBIO); Golfito, R.F. Golfo Dulce, Estación Agujas, Sendera Ajo, 250– 350m. 2 Nov 1998. M. Umana. Manual. L_S_ 276750 _ 526550 # 56934, INB0003308650 (1 F, INBIO); same except INB0003308658 (1 M, INBIO); 3 km SW of Rincon, 9 ° 55 ’N, 84 ° 13 ’W, 10m, Oct –Dec 1990, malaise trap, P. Hanson (1 F, USNM); R.F. Golfo Dulce, 5km W Piedras Blancas, 100m, malaise trap, x. 1991, P. Hanson (1 F, LEM); Peninsula Osa, 23 km N Pto. Jimenez, La Palma, 10m, Malaise trap, x –xi. 1990, P. Hanson (1 F, LEM); Cartago: Turrialba, vii­ 15 ­19.1965, P.J. Spangler (1 M, USNM).

Diagnosis. This species can be differentiated from all other Cerodontha  ( Dizygomyza  ) species by the combination of the following characters: black halter, the presence of only one ors and wings conspicuously infuscated in cell r 1 and r 2 + 3.

Description. Head including antenna, brown, gena paler, yellowish­brown; epistoma and facial ridge yellowish. Thorax uniformly brown, calypter including margin white, fringe brown. Halter completely brown. Legs brown, except foreknee and tarsi pale yellow. Abdomen brown.

Frons width 0.35–0.40 mm; ratio of frons width to eye width 1.6–1.8; orbit broad, 0.22–0.27 width of frons at midpoint; orbit widening anteriorly ( Fig. 6View FIGURES 1 – 7); frons projecting above and in front of eye in profile, orbit forming only narrow ring below eye; eye slightly pubescent; lunule and anterior margin of orbit with patch of silvery pubescence best seen in posterodorsal view; orbit and ocellar triangle shining; frons with microtomentum; usually 3 ori and 1 ors (one aberrant specimen with 3 ors, including one displaced medially at margin of orbit and frons) anterior ori a little shorter than other ori; first 2 anterior ori inclinate; posterior ori reclinate and slightly lateroclinate; ors reclinate and slightly inclinate; 4–5 reclinate and/or inclinate orbital setulae, short, normal, in one row, present anteriorly (not reaching ors); first flagellomere slightly enlarged in male with white pubescence on lateral surface and black pubescence on medial surface, extent of white pubescence variable; first flagellomere in female with black pubescence apically and medially; arista longer than eye height with long pubescence; arista white basally in some specimens, not obviously swollen at base; gena with uniform width; gena height 0.20–0.25 times eye height; lunule broad, in the form of a semicircle, or a little higher, upper margin reaching level of first or second ori; bases of antennae widely separated. Three postsutural dc, anterior postsutural 0.57–0.70 times length of second postsutural; presutural dc absent; acrostichals irregular in 7–8 rows; prsc absent; one postsutural intra­alar; 1 presutural and two postsutural supra­alar; notopleuron with 2 bristles on ventral side. Midtibia with strong apico­ventral bristle, almost half as long as first tarsomere; no other bristles on fore or mid tibiae. Wing length 1.9–2.1 mm in males and 1.8 –2.0 mm in females; R 4 + 5 ending a little closer to wing tip than M 1 + 2; costa extending to M 1 + 2; wing conspicuously infuscated in cell r 1 and r 2 + 3 ( Fig. 7View FIGURES 1 – 7); cross­vein dm­cu present; second costal sector 3.8–4.7 times length of fourth; last section of CuA 1 short: 0.48–0.56 times length of penultimate. Crossvein r­m located at 0.3–0.4 the length of cell dm.

Male genitalia. Distiphallus with tubules mostly parallel sided, slightly dilated at apex ( Fig. 1, 2View FIGURES 1 – 7). Hypandrium broad and rounded ( Fig. 1View FIGURES 1 – 7). Surstylus with patch of strong bristles at medioventral margin ( Fig. 3View FIGURES 1 – 7). Ejaculatory apodeme with narrow base and moderately enlarged at apex ( Fig. 4View FIGURES 1 – 7). Anal projection of epandrium prominent ( Fig. 5View FIGURES 1 – 7).

Derivation of Species Name. The species name refers to the black halteres of this species.

Comments. The conspicuously infuscated cells r 1 and r 3 + 4 in the wings and the presence of only one ors are unique characters among New World Dizygomyza  . However, the dark halter is also present in Cerodontha inepta (Spencer)  a species known from Brazil ( Spencer 1963). That species was originally placed in the subgenus Poemyza and was later transferred to Dizygomyza ( Spencer 1966)  . But according to the description of the lunule (high and narrow, upper margin above level of upper ori) it seems that this species does not belong in the subgenus Dizygomyza  . Unfortunately the species is known from a female specimen only. Other than the higher lunule, Cerodontha inepta  differs externally from Cerodontha (D.) nigrihalterata  by having 2 ori and 3 ors, orbital setulae unusually long, last section of CuA 1 only slightly shorter than penultimate in ratio 20: 22, wing only slightly brownish, and stalk of halter yellowish.


Smithsonian Institution, National Museum of Natural History