Ophiomyia mimuli Eiseman & Lonsdale 2018, spec. nov.
Creators: name: Eiseman, Charles S.
name: Lonsdale, Owen
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Agromyzidae
Ophiomyia
Ophiomyia mimuli

description: Ophiomyia mimuli spec. nov.
(Figs. 10, 91–93, 245–249)
Holotype. OHIO: Hocking Co., South Bloomingville, Deep Woods Farm, 6.viii.2016, em. 7–12.viii.2016, C.S. Eiseman, ex Mimulus ringens, #CSE2848, CNC654475 (1♂).
Paratypes. MASSACHUSETTS: Franklin Co., Northfield, 276 Old Wendell Rd., 9–10.viii.2016, em. 10.viii.2016, C.S. Eiseman, ex Mimulus ringens, #CSE2862, CNC654074, CNC654075 (1♂ 1♀); OHIO: same collection as holotype, CNC654473, CNC654474, CNC654476 (3♀).
Etymology. The specific epithet refers to the host plant, Mimulus L.
Host. Phrymaceae: Mimulus ringens L.
Larval mine. (Figs. 91–92) Whitish and linear, with black frass in widely spaced grains, irregular lumps, or short streaks; formed primarily in the stem (Fig. 91). Some individuals enter leaves, mining on either surface or undulating between the two; leaf mines tend to follow the midrib or lateral veins (Fig. 92).
Puparium. (Fig. 93) White; formed within the stem, or occasionally adjacent to the midrib on the lower surface of a leaf, with the anterior spiracles projecting through the epidermis.
Distribution. USA: MA, OH.
Adult description. Wing length 1.9–2.0mm (♂), 2.0– 2.3mm (♀). Length of ultimate section of vein CuA1 divided by penultimate section: 0.8–0.9. Eye height divided by gena height: 7.8–8.1. First flagellomere small, rounded. Arista pubescent. Ocellar triangle well-defined, slightly longer than wide, reaching level of posterior ori; tubercle shallow. Frons sloping down to short face. Orbital plate narrow, not well defined, slightly shining compared to frontal vitta. Eye obliquely slanted. Lunule wide, very shallow and barely exposed. Facial carina high, bulb prominent, subshining dorsally, barely widened relative to dorsal section of carina above bulb, which is widely and shallowly grooved. Genal process nearly as long as high, sides forming slightly more than 45° angle. Clypeus very narrowed and sharply truncated apically with extreme apex slightly flared. Notum subshining.
Chaetotaxy: Two ori, two ors. Ocellar and postvertical setae subequal to ors. Male fasciculus thin, straight. Two dorsocentral setae. Eight irregular rows of acrostichal setulae. Lateromedial setae on mid tibiae difficult to see in all specimens, but for those where it is clear, there is one in males and two in females, but difficult to see.
Coloration: (Fig. 10) Setae black. Body dark brown with faint metallic green shine on abdomen. Calypter margin and hairs dark brown. Haltere brown.
Genitalia: (Figs. 245–249) Surstylus very small, rounded, fused to epandrium, with several medial tuberclelike setae on inner surface. Hypandrium subtriangular with long basal arm. Basiphallus with long, stronger right arm fused at base to much shorter, weaker left arm. Mesophallus base ending past level of distiphallus base, small, cylindrical, fused ventromedially to distiphallus. Distiphallus ovate in ventral view with ends tapered, basal half not high, surface shallowly pitted; left surface of distal half with short interlocking ridges and internal spinules, dorsally with narrow process directed distally. Ejaculatory apodeme well-developed with laterobasal process and medial rib; blade narrow; sperm pump with strong transverse sclerotized bar and upcurved, domelike ends.
Comments. The new species will key with some difficulty to Ophiomyia apta Spencer in Spencer & Steyskal (1986), and while externally similar to this and many other Ophiomyia, the fasciculus of O. mimuli is straight and the distiphallus (Figs. 248, 249) is characteristic: the distal half is gradually tapered with minute left distolateral ridges, and the basal half is shallowly pitted, rounded, not higher than the distal half and the base terminates in a small, rounded point.
This is the first record of an Ophiomyia from Phrymaceae.
description: Published as part of 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, pp. 1-156 in Zootaxa 4479 (1) on pages 22-23, DOI: 10.11646/zootaxa.4479.1.1, http://zenodo.org/record/1452913