Masona van Achterberg, 1995

Pos, Davide Dal, Broad, Gavin R. & Martens, Abigail P., 2024, Small jewels: two new species of the rare genus Masona van Achterberg (Hymenoptera, Ichneumonoidea, Braconidae), with a catalogue of world species and comments on the peculiar morphology of the genus, European Journal of Taxonomy 925 (1), pp. 135-160 : 137-138

publication ID	https://doi.org/ 10.5852/ejt.2024.925.2457
publication LSID	lsid:zoobank.org:pub:D01FE9CE-15E5-46ED-A83E-F9A44D829D64
DOI	https://doi.org/10.5281/zenodo.10809899
persistent identifier	https://treatment.plazi.org/id/038787DC-FFF2-D359-A6FF-FB7CFAA8BBBB
treatment provided by	Plazi
scientific name	Masona van Achterberg, 1995
status

Treatment

Key to the world species of Masona van Achterberg, 1995 View in CoL View at ENA

The following key has been modified and expanded from that provided in van Achterberg (1995). Only the males of M. prognatha and M. similis are known. Despite the fact that timpaynei is treated as incertae sedis in the subfamily Neorhacodinae in the present paper, we report it here as [ Masona ] timpaynei , and we include it into the following key to facilitate identification.

1. Female winged; head orthognathous; tibia not expanded .................... [M.] timpaynei Quicke, 2019 incertae sedis in Neorhacodinae ( Ichneumonidae )

– Female wingless; head prognathous ( Figs 1 View Fig , 6 View Fig , 10 View Fig , 12A View Fig ); tibia bulbous ( Figs 1 View Fig , 2B View Fig , 7A View Fig , 8B View Fig ) ........ 2

2. Scutellum present ( Figs 1B View Fig , 5A View Fig , 7A View Fig ) ................................................................................................ 3

– Scutellum absent ( Figs 10A View Fig , 11A View Fig ) .................................................................................................... 5

3. Propodeum strongly bulbous, with carinate apophyse ( Fig. 2A View Fig ); pronotum with a strongly projecting flange ( Fig. 6A View Fig ); antenna with 14 flagellomeres; body pale yellowish ( Fig. 7A View Fig ); Brazil.................. ....................................................................................................... M. popeye Quicke & Chaul, 2019

– Propodeum not strongly bulbous, without carinate apophyse ( Fig. 2B View Fig ); pronotum without a strongly projecting flange ( Fig. 6B View Fig ); antenna with 11 or 16 flagellomeres; body brown or yellowish ( Figs 1 View Fig , 2B View Fig , 5 View Fig , 6B View Fig ); USA (Southeast & Puerto Rico) .................................................................................... 4

4. Antenna with 11 flagellomeres; apical flagellomere 5 × as long as wide ( Fig. 5A View Fig ); head in dorsal view not strongly narrowing posteriorly, almost parallel-sided ( Fig. 5A View Fig ); occipital carina simple, not foveolate ( Fig. 5A View Fig ); body pale yellowish ( Figs 5 View Fig , 6B View Fig ); body length 1.2 mm; Puerto Rico................ .................................................................................................... M. neon Dal Pos & Martens sp.nov.

– Antenna with 16 flagellomeres; apical flagellomere 2.2 × as long as wide ( Fig. 1A View Fig ); head in dorsal view strongly narrowing posteriorly ( Fig. 1B View Fig ); occipital carina foveolate ( Fig. 1B View Fig ); body dark brown ( Figs 1 View Fig , 2B View Fig ); body length 1.8 mm; USA (Southeast) ......... M. bulbofemoralis van Achterberg, 1995

5. Length of third flagellomere 1.3–1.5 × its width; antenna as long as combined length of head and mesosoma ( Figs 10A View Fig , 11A View Fig ); head in dorsal view more robust, slightly narrowed posteriorly ( Figs 10A View Fig , 11A View Fig ); occipital carina short in lateral view, not reaching ventral margin of gena ( Fig. 10B View Fig ); precoxal sulcus present, superficially impressed ( Fig. 11B View Fig ); male pterostigma present, weakly defined (male of M. wow sp. nov. unknown); USA................................................................................................. 6

– Length of third flagellomere about 2.5× its width; antenna somewhat longer than combined length of head and mesosoma; head in dorsal view less robust, narrowed posteriorly ( van Achterberg 1995: figs 735, 741); occipital carina longer in lateral view, almost reaching external ventral margin of gena ( van Achterberg 1995: fig. 733); precoxal sulcus absent; male pterostigma absent (male of M. infuscata unknown); Australia..................................................................................................... 7

6. Head smooth, without processes ( Fig. 10 View Fig ); pronotum not projecting into a flange, round ( Fig. 10 View Fig ); USA (Southeast) ....................................................................... M. prognatha van Achterberg, 1995

– Head with two processes on the frons, about half the distance between eyes and occipital carina ( Figs 11B View Fig , 12A View Fig ); pronotum with a strongly projecting flange ( Fig. 11B View Fig ); USA (Southwest) ............ ................................................................................................... M. wow Dal Pos & Martens sp. nov.

7. Antenna with 12–14 flagellomeres; metasoma completely pale yellowish; fore basitarsus in dorsal view more robust ( van Achterberg 1995: fig. 734); head in dorsal view slightly less narrowed posteriorly ( van Achterberg 1995: fig. 735); length of body of female 0.9–1.2 mm ............................................ .......................................................................................................... M. similis van Achterberg, 1995

– Antenna with 16 flagellomeres; metasoma (except first tergite) more or less dark brown; fore basitarsus in dorsal view less robust ( van Achterberg 1995: fig. 742); head of female in dorsal view slightly more narrowed posteriorly ( van Achterberg 1995: fig. 741); length of body of female about 1.7 mm ....... ..................................................................................................... M. infuscata van Achterberg, 1995