Cerodontha (Dizygomyza) feldmani,

Eiseman, Charles S. & Lonsdale, Owen, 2018, New state and host records for Agromyzidae (Diptera) in the United States, with the description of thirty new species, Zootaxa 4479 (1), pp. 1-156: 43

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Cerodontha (Dizygomyza) feldmani

spec. nov.

Cerodontha (Dizygomyza) feldmani  spec. nov.

( Figs. 25–26View FIGURE 22–29, 128View FIGURES 124–132, 286–292View FIGURES 286–292)

Holotype. NORTH CAROLINA: Durham Co., Durham, Leigh Farm Park , 24.v.2016, em  . 30.v.2016, T.S. Feldman, ex Carex flaccosperma  (basal rosette), #CSE2523, CNC654291 (1♂).

Etymology. This species is named for Tracy S. Feldman, who collected the type specimen as well as all other North Carolina material used in this study.

Host. Cyperaceae  : Carex flaccosperma Dewey. 

Leaf mine. ( Fig. 128View FIGURES 124–132) Irregular, upper surface, with some portions whitish and some green (interparenchymal); frass not evident.

Puparium. ( Fig. 26View FIGURE 22–29) Brown, elongate; tapering and with more pronounced segmentation in the posterior half; most segments with a roundish black patch on the ventral surface; formed within the mine, toward the base of the leaf.

Distribution. USA: NC.

Adult description. Wing length 1.9mm (♂). Female unknown. Length of ultimate section of vein CuA1 divided by penultimate section: 1.5. Eye height divided by gena height: approximately 6.0. First flagellomere much enlarged and covered with dense pale hairs to base of segment; base of antennae widely separated. Arista pubescent and with swollen basal section as long as pedicel height. Lunule 2/3 width of frons, height half width. Ocellar triangle not evident. Orbital plate weakly defined, slightly more sclerotized than vitta. Posterior ocelli displaced, separated by twice ocellar width (anterior and posterior ocelli separated by less than one ocellar width). With light gray pruinosity that is denser on notum.

Chaetotaxy: Two ori, two ors. Ocellar and postvertical setae subequal to ors. Four dorsocentral setae, decreasing in length anteriorly, especially on anterior two pairs. Six scattered rows of acrostichal setulae.

Coloration: ( Fig. 25View FIGURE 22–29) Setae dark brown. Body dark brown; frontal vitta and inner half of orbital plate with beige tint; lunule slightly iridescent; face with yellow ventromedial spot; calypter white; haltere yellow; apex of fore femur light yellow with spot as long as wide.

Genitalia: ( Figs. 286–292View FIGURES 286–292) Epandrial process above anus rounded, bumpy, longer than wide. Surstylus fused to epandrium, small, slightly pointed, with row of three tubercle-like setae along inner margin. Process of subepandrial sclerite long, narrow, tapered, slightly curved, outer distal margin serrated and with subapical point. Hypandrium stout, rounded apically, inner lobe distal, transverse, with several sockets. Small, narrow postgonite typical of genus. Phallophorus elongate, with ventromedial projection of margin and dorsal fusion to basiphallus. Basiphallus short, single dorsal plate split apically into one pair of ventrally curved branches, with left arm shorter. Hypophallus large and membranous with right sclerite absent and left sclerite long and narrow with triangular process on outer margin before midpoint. Paraphallus membranous, lobate, with short rectangular ventral sclerotization. Mesophallus width approximately ¼ length, mostly narrow along length with slight lateral swelling subapically and before midpoint. Distiphallus slightly longer than mesophallus, dark, entirely divided into two tubules; sinuate, with small, sharp curve at base and large C-shaped curve apically; apex paler, slightly dilated. Ejaculatory apodeme well-developed; base extended to duct insertion; stem short, grading into paler blade.

Comments. Cerodontha (Dizygomyza) feldmani  is a relatively dark, indistinct species with an enlarged first flagellomere, yellow fore knee and 4 fronto-orbitals, but the phallus is distinctive ( Figs. 291–292View FIGURES 286–292). The left sclerite of the hypophallus is present, long, narrow and with a strong, pointed outer-basal process, the paraphallus is clear and lobate with a rectangular ventral sclerotization, and most distinctively, the mesophallus is narrow along its entire length with only slight medial and subapical swelling, and the distiphallus is long with a sharp, short basal bend and a large semicircular apical curve. This species will key to C. (D.) paludosa  using Spencer & Steyskal (1986), but that Californian species has a larger wing (2.5–3.0mm) and a larger, more broadly curved distiphallus and the mesophallus is more slender and segmented.