New Contributions to Pseudonapomyza (Diptera: Agromyzidae) from Spain: Addition of Three New Species

The genus Pseudonapomyza (Diptera: Agromyzidae) includes the main leafminer pests for monocots. Three new species are described that were captured using Malaise traps in “Tinença de Benifassà”, “Font Roja” and “Lagunas de La Mata-Torrevieja” (Spain) Natural Parks: Pseudonapomyza curvata n. sp., P. longitata n. sp., and P. sicicornis n. sp. Systematics. Ecological data are discussed.


Introduction
Pseudonapomyza genus belongs to the subfamily Phytomyzinae within the family Agromyzidae (Diptera). In temperate zones of Northern and Southern hemispheres Pseudonapomyza mines leaves exclusively on monocots (Gramineae family) (Spencer 1990).
The important pest species of this genus are Pseudonapomyza asiatica Spencer, 1961 (Liao andShiao 2001) in Taiwan, P. gujaratica Shah, 1982in India or P. spicata (Malloch, 1914 in the Philippines (Litsinger and Barrion 1987). Benavent-Corai (2004) cites P. atra (Meigen, 1830) and P. spinosa Spencer, 1973 as species of economic interest in Spain. Cereals with the most agronomic importance susceptible to be attacked by members of the Pseudonapomyza genus in Spain are in the genera Avena, Secale and Triticum (Benavent-Corai et al. 2005).
Normally, low populations of these species are controlled naturally by parasitoids. The misuse of pesticides and other human actions can break this balance or cause the development of pest species that previously were not a concern. Getting to know the overall biodiversity of Agromyzidae is a preventive tool for present and future pest control. (Figure 1). Tinença de Benifassà Natural Park (Castellón): it is located in the Northern part of the Valencian Community bordering the Tarragona and Teruel provinces. The surface area of the park is around 25.8 hectares, with minimal anthropological impact (<250 residents). It presents high faunistic and vegetal biodiversity including well preserved woodlands of pine and oak, scrubland composed of typical mediterranean vegetation including a high number of endemisms and crop areas. It typically snows in the winter (5-50 mm) and average temperatures are around 9-22º C in winter and summer, respectively. Annual rainfall is around 450-550 mm.

Studied areas
Font Roja Natural Park (Alicante): it is located in the Alicante province. It is basically a holm oak mountain composed of Tertiary calcareous rocks. The biodiversity of vegetation is high, including different areas composed of deciduous wood, shady evergreen or holm oak groves, sunny brushwood zones, rock vegetation, rubble vegetation, pine woods and crops. Annual rainfall is comprised around 350-450 mm, and average temperatures are around 7-23º C in winter and summer, respectively.
Lagunas de la Mata-Torrevieja Natural Park (Alicante): it is located in the southern point of Valencian Community. It is characterized by saline soils, semiarid climate, annual precipitations lower than 300 mm, and average temperatures around 13-27º C in winter and summer, respectively. There are salt marsh areas, carrizal-juncal zones and scrubland. Fresh vegetation is present until mid-May, later the high temperatures (>35º C) destroy practically all annual plants.
Capture system. Insects were captured using one Malaise trap per site (Model G700, Entomopraxis-Barcelona-Spain), that proved to be highly effective in monitoring the evolution of populations of Agromyzidae flies (von-Tschirnhaus 1992)  Diagnosis. The presence of a subcostal extremely short vein compared to the rest of Agromyzidae specimens, as well as the characteristic pointed antenna (Zlobin, 2002) were the main diagnostic characters used to separate specimens of the genus Pseudonapomyza.
Identifications were exclusively carried out with male specimens. This study mainly uses the Diptera terminology system proposed in the Manual of Nearctic Diptera by McAlpine (1981). The dorsocentral (dc) bristles are numbered from posterior to anterior on the thorax.

Results and Discussion
Below three new species for science are presented: Pseudonapomyza curvata n. sp., P. longitata n. sp., and P. sicicornis n. sp. Derivatio nominis. This new species is named according to the particular aedeagus shape.
Description. Head (Figure 2a). Frons only clearly prominent at level of lunule. 3 rd antennal segment pointed at upper corner, as long as wide, minutely pubescent with short brown pilosity uniformly distributed. Arista normal, with very fine and very short pilosity. Fronto-orbital plate (= parafrontalia) with 2 ors (upper orbital) and 3 curved inwards ori (lower orbital). Orbital setulae short (9-10) and reclinated. Ocellar triangle 0.12 x 0.11 mm slightly longer than wide, extends to level of upper ors. Two ocellar bristles (oc) a little divergent, slightly smaller and as strong as ors. Two postocellar bristles (poc) clearly divergent and a little longer than oc. Internal bristle (vti) (= inner vertical setae [i vt s]) long and strong, much longer than ors and ori. External vertical bristle (vte) (= outer vertical setae [o vt s]) strong but much smaller than vti (on average, vti 1.5 times longer than vte). Inter-ocular space measured (in frontal view) at level of ors = 0.9 X eye (in profile, at a highest measurement). Cheeks forms arc below eye. Gena including cheeks (at highest measurement) = 0.28 X eyes (in profile at highest measurement). Eyes without pilosity.
Thorax. Mesonotum with 3+0 long and strong dorsocentral bristles (dc) increasing in size to scutellum. acr numerous (9-10) irregularly arranged in 5-6 no spaced rows. Intra alar seta (ia) small, about same size as acr. Anterior and posterior supra alar setae (spal) as long and strong as first and second dc. Humeral cali with 1 anterior bristle accompanied by 4-5 small setulae. Notopleura with 2 normal notopleural bristles. Posterior part of anapisternum (mesopleura) with 1 strong bristle, and generally 1 small setula at each side. Katepisternum (sternopleura) with 1 strong bristle situated at supero-posterior angle. Disc of scutellum without particular seta except usual 4. 2 apical scutellar setae (ap sctl s) generally parallel or very slightly convergent; 2 basal scutellar seta (b sctl s) about same size as ap sctl s, parallel or slightly directed outwards. Wing: length (on average) 1.5 x 0.63 (long x wide) mm. Thickening of costal (C) vein, clearly reaching R 4+5 ending much before wing tip. Second and third costal section short. In proportion the length from first to fourth costal section is approximately 1:0.63:0.45:0.85. Discal cell (dm) and transverse (dm-cu) [second crossvein] missing. Legs: with normal pilosity with the usual pre-apical bristle.
Abdomen. Setae of the tergites very distinct and relatively numerous arranged stronger on the posterior marginal border. Aedeagus and associated structures. Aedeagus (Figures 2b and 2c). Cercus short and thin. Sperm pump (= ejaculatory apodeme) longer (0.2 mm) than wide (0.12 mm) (wider part), different from the other two species described (Figure 2d). Surstylus (= gonostylus) with dense pilosity inside of each lower corner (Figure 2e). In ventral view the distiphallus presents a typical round shape while in lateral view 2 curved structures are present.

Bionomy. Unknown host-plants.
Phenology (Figure 3). In "Font Roja" this species was found from late June to mid October with average temperatures of 22.4 -28.2ºC (36.4º C max. and 17.1º C min.). In 2004 three generations were produced but low captures made it difficult to exactly predict the development of this species. Captures of "Tinença de Benifassà" were produced in August with average temperatures of 23.5 -24º C (31º C max. and 17º C min.).
Derivatio nominis. This new species is named according to the aedeagus shape.
Description. As P. curvata, except: Head (Figure 4a). Frons moderately prominent between eyes in profile (more pronounced at the height of the lunule). 3 rd antennal segment strongly pointed at upper corner, as long as wide, minutely pubescent with short brown pilosity, these clearly more distinct on the border of the antenna. Fronto-orbital plate (= parafrontalia) with 1 ors (upper orbital). Orbital setulae short (minimum 12) erected along ori and reclinated along ors in an only row. Ocellar triangle longer than wide 0.13 x 0.11 mm. Two ocellar bristles (oc) slightly divergent or parallel. Two postocellar bristles (poc) slightly divergent and equal or slightly longer than oc. Inter-ocular space measured (in frontal view) at level of ors = 1.7 X eye (in profile, at a highest measurement). Gena including cheeks (at highest measurement) = 0.32 X eyes (in profile at highest measurement).
Abdomen. Setae of the tergites very distinct and relatively numerous arranged on dorsal part, while on ventral side fine pilosity is present.
Phenology ( Figure 5). According to the captures produced in "Font Roja", 3-6 generations were distributed from mid-May to mid September. The largest captures were 15 males per week in late June with an average temperature of 23.2º C (28.9º C max. and 17.5º C min.). The capture in "Tinença de Benifassà" was made in early/mid June with average temperatures of 19º C (23º C max. and 15º C min.). Captures of this species in "Lagunas de La Mata-Torrevieja" were low and occurred irregularly, being in the range of average temperatures of 12.5-27º C (28º C max. and 8º C min.).

Systematic position.
Compared with the rest of the Palaearctic species, higher affinity toward Pseudonapomyza europaea Spencer, 1973 is observed, but it differs in the shape of distiphallus being shorter and more rounded in the case of P. longitata.    Description. As P. curvata, except, Head (Figure 6a). 3 rd antennal segment strongly pointed at upper corner, as long as wide, minutely pubescent with short brown pilosity, these clearly more distinct in the body of the antenna. Fronto-orbital plate (= parafrontalia) with 2 curved inwards ori (lower orbital). Orbital setulae short (10-12) slightly reclinated along ori and reclinated along ors in an only row. Ocellar triangle as long as wide 0.1 x 0.1 mm. Two ocellar bristles (oc) slightly divergent or parallel. Two postocellar bristles (poc) slightly divergent and equal or slightly longer than oc. Inter-ocular space measured (in frontal view) at level of ors = 1.1 X eye (in profile, at a highest measurement). Gena including cheeks (at highest measurement) = 0.25 X eyes (in profile at highest measurement).

Bionomy. Unknown host-plants.
Phenology. This species has been captured when average temperatures were 23.5º C (19º C min. and 28º C max.). Based on the captures an only generation in summer is observed, being difficult to predict the evolution of this species. Although most probable that it is also present in summer and autumn with several generations.
Systematic position. This species is characterized by having a particular morphology of the aedeagus. Comparing the aedeagus morphology with the rest of Palaearctic species the closest species are Pseudonapomyza siciformis Zlobin, 2002 andP. strobliana Spencer, 1973. The biggest differences in distiphallus of both cases is the particular curvature of the upper horn and the bottom round shape.