Description of the first species of Fiorianteon Olmi (Hymenoptera, Dryinidae) from the Afrotropical region

Abstract Fiorianteon sulcatum sp. n. is described from Fianarantsoa Province (Madagascar). It is the first species of Fiorianteon found in the Afrotropical region. The genus Fiorianteon can be distinguished from the closely related genus Conganteon by the distal part of the stigmal vein, which is as long as, or shorter than the proximal part of the stigmal vein (longer than the proximal part of the vein in Conganteon).

The genus Fiorianteon Olmi, 1984 (Conganteoninae) is only present in the Oriental and Eastern Palaearctic zoogeographical regions (Olmi and Xu 2015). Four species have been described from the above regions (Xu et al. 2013;Olmi and Xu 2015). The hosts are unknown.
The genus was originally revised at world level by Olmi (1984) and more recently by Xu et al. (2013) and Olmi and Xu (2015) for the Oriental and the Eastern Palaearctic regions respectively.
In 2015, we examined additional specimens of Dryinidae from Madagascar, which included the new species of Fiorianteon described in this paper.

Material and methods
The descriptions follow the terminology used by Olmi (1984), Olmi and Guglielmino (2010) and Olmi and Virla (2014). The reported measurements are relative, except for the total length (head to abdominal tip, without antennae), which is expressed in millimeters. In the descriptions, POL is the distance between the inner edges of the two lateral ocelli; OL is the distance between the inner edges of a lateral ocellus and the median ocellus; OOL is the distance from the outer edge of a lateral ocellus to the eye; OPL is the distance from the posterior edge of a lateral ocellus to the occipital carina; and TL is the distance from the posterior edge of an eye to the occipital carina. The material studied in this paper is deposited in the collections of the California Academy of Sciences, San Francisco, USA (CAS).
The multifocal pictures were taken by a stereomicroscope Leica M205A and Leica DFC450 video camera, captured using Leica Application Suite v. 4.2.0.

Distribution. Madagascar.
Remarks. The two main characters distinguishing the new species are detailed in the above diagnosis. These characters are not present in any of the known species of Conganteoninae (Olmi and Xu 2015;Xu et al. 2013).
Etymology. The species is named sulcatum because the head is sculptured by many longitudinal subparallel keels. Azevedo et al. (2010) listed 123 species, 15 genera and 7 subfamilies of Dryinidae from the Malagasy region. The recorded genera and subfamilies were as follows: Anteoninae: Anteon Jurine, 1807 (28 species), Deinodryinus Perkins, 1907 (13 species), Lonchodryinus Kieffer, 1905   Ljungh, 1810 (30 species), Haplogonatopus Perkins, 1905 (one species) and Neodryinus Perkins, 1905 (two species). With the description of the above new species the number of species in the Malagasy region is elevated to 124 and the genera to 16.