Nemorimyza Frey, 1946

Genus Nemorimyza Frey, 1946 View in CoL

Nemorimyza Frey, 1946: 42 View in CoL .

TYPE OF GENUS. — Agromyza posticata Meigen, 1830 .

REMARKS

Nemorimyza View in CoL , a small genus consisting of five species (excluding the new species described below and excluding N. xizangensis Chen & Wang, 2008 View in CoL from China, which was transferred to Phytobia ( von Tschirnhaus 2023) View in CoL , is predominantly found in the Neotropical region, although it is not exclusively limited to this area. The genus is characterized by a small, often silvery, or greyish dusted lunule; body almost completely black with halter at least partially black (except for male N. posticata (Meigen, 1830) View in CoL with abdomen conspicuously yellow posteriorly, halter white and fore knee narrowly yellow). Most species have 3+ 1 dc, except N. posticata View in CoL with 3 +0 dc (sometimes with an additional smaller pair close to suture). Some species have a well-developed posterolateral seta on the fore tibia. The male genitalia are characterized by a subepandrial sclerite that is broadly fused with each other, with numerous microscopic spines centrally and a pair of strong spine-like processes, directed ventrally ( Zlobin 1996b). However, these features are located within the epandrium and can be difficult to observe without damaging surrounding structures. One Nemorimyza species View in CoL , N. maculosa (Malloch, 1913) View in CoL , has previously been reported from French Guiana ( Anonymous 2018; Martinez & Étienne 2002; Ryckewaert 2003). A total of five specimens were collected on the Mitaraka massif, representing at least two species ( Boucher & Pollet 2021; Boucher & Savage 2022). One of them (identified as morphospecies Nemorimyza View in CoL Mit- 2 in Boucher & Pollet 2021) is known from two female specimens only. Nemorimyza View in CoL Mit-1 and Nemorimyza View in CoL Mit-2 can only be differentiated by subtle external differences, but DNA barcoding of two female specimens supported the assignment to two different species ( Boucher & Savage 2022). In Boucher & Savage 2022 (Table 5), Nemorimyza View in CoL Mit-2 and an extra specimen from Guanacaste, Costa Rica, gathered by D. Janzen and W.Hallwachs, were initially grouped together under the same BIN (Barcode Index Number) (BOLD:ADB9391). However, due to the discovery of a new sequence from Costa Rica (PLGCS231-20) that exhibited closer similarity to sequence JCCCY4402-16, Nemorimyza View in CoL Mit-2 has now been relocated to a different BIN (BOLD:AEN9883), and the formal description will be delayed until a male becomes available (possibly from the BioAlfa project at Guanacaste, Costa Rica ( Janzen & Hallwachs 2019). Nemorimyza View in CoL Mit-1 is described below based on a single male specimen. The status of two female specimens identified as Nemorimyza View in CoL Mit-1, in Boucher & Pollet 2021 (including one barcoded specimen ( Boucher & Savage 2022) is currently uncertain and may represent a third species. Additional studies will be necessary to confirm their status.