Xanthochlorus silaceus Chandler & Negrobov, 2008 (Xanthochlorinae)

Pollet, Marc, Andrade, Rui, Gonçalves, Ana, Andrade, Pedro, Jacinto, Valter, Almeida, Jorge, Braekeleer, Anja De, Calster, Hans Van & Brosens, Dimitri, 2019, Dipterological surveys in Portugal unveil 200 species of long-legged flies, with over 170 new to the country (Diptera: Dolichopodidae), Zootaxa 4649 (1), pp. 1-69 : 60-61

149. Xanthochlorus silaceus Chandler & Negrobov, 2008 (Xanthochlorinae) — new to Portugal

( Fig. 7I )

Number of specimens recorded. 4.

Distribution. Thus far only recorded from Britain. Portugal: one province (Beira Litoral), first record from continental Europe!

Ecology. The only Portuguese specimens of X. silaceus were recorded from a pine forest with Acacia sp. , Arbutus unedo , Quercus spp. and Castanea sativa , and a botanical garden with artificial ponds and fountains. Its ecology is largely unknown.

Rarity (%). 2.3 (rare).

Activity period. June–July.

150.? Xanthochlorus tenellus (Wiedemann, 1817) (Xanthochlorinae)

Distribution. Europe, but rather uncertain since the discovery of two new Xanthochlorus species in Britain ( Chandler & Negrobov 2008). Portugal: Beira Alta ( Naglis & Barták 2015).

Ecology. Mainly recorded from open, rather dry deciduous forests and forest edges.

Remarks. Naglis & Barták (2015) listed only one female specimen, which we treat here as uncertain considering the slight and often indecisive colour differences between females of related species.

Pelastoneurus sp. (Dolichopodinae) — new to the Palaearctic Region!

Remarks. One female specimen was collected on 13 July 2014 in Castro Marim (district Faro) in the province of Algarve. It features all characteristics of this primarily tropical genus that is known from all zoogeographical realms except for the Palaearctic and Afrotropics (Yang et al. 2016).

Figures

FIGURE 7. Selected Portuguese habitats of dolichopodid species. A. Arcozelo, October 2011 (Aphrosylus celtiber, A. ferox); B. Avintes, Parque Biológico de Gaia (PBG), July 2011 (Chrysotimus molliculus); C. Benfeita, Serra do Açor, May 2014 (Campsicnemus umbripennis, Rhaphium brevicorne); D. Canelas, Ria de Aveiro, September 2011 (Campsicnemus simplicissimus, Teuchophorus spinigerellus); E. Castro Laboreiro, Teso, May 2016 (Rhaphium longicorne); F. detail of same location; G. Coja, river Alva, May 2014 (Hercostomus appendiculatus); H. Esposende, May 2014 (Aphrosylus mitis); I. Lousã, July 2011 (Xanthochlorus silaceus).