Gonatocerus (Lymaenon) acuminatus ( Walker, 1846 )

Triapitsyn, Serguei V., 2013, Review of Gonatocerus (Hymenoptera: Mymaridae) in the Palaearctic region, with notes on extralimital distributions, Zootaxa 3644 (1), pp. 1-178 : 42-44

Gonatocerus (Lymaenon) acuminatus ( Walker, 1846)

( Figs 50–57 )

Mymar acuminatus Curtis 1829: 112 . Nom. nud. ( Graham 1972: 132).

Anaphes acuminatus Curtis 1837: 134 . Nom. nud. ( Graham 1972: 132).

Lymaenon acuminatus Walker 1846: 51 .

Lectotype female [ MVMA] (not examined), designated by Graham 1972: 131. Type locality: unknown ( UK).

Gonatocerus acuminatus (Walker) : Dalla Torre 1898: 429 (catalog); Graham 1972: 131–132 (discussion, lectotype designations, taxonomic history and references, synonymy); Matthews 1986: 224, 227 (diagnosis, distribution).

Oophilus longicauda Enock 1909: 458 .

Lectotype female [ BMNH] (not examined), designated by Graham 1972: 131–132. Type locality: Richmond [Park], London Borough of Richmond upon Thames, England, UK. Synonymized under G. acuminatus by Graham 1972: 132.

Gonatocerus longicauda (Enock) : Girault 1911: 277 (record from England, UK).

Oophilus sp.: Bakkendorf 1934: 31 (record from Denmark).

Lymaenon acuminatus (Haliday) Walker : Debauche 1948: 81 (list); Hincks 1952: 64 (mentioned from England).

Oophilus longicauda Enock : Kryger 1950: 79 –81 (record from Denmark, illustrations, discussion).

Lymaenon longicauda (Enock) : Debauche 1948: 88; Viggiani 1969: 39 (member of the longicauda species group of Lymaenon ).

Type material examined. Paralectotype, here designated: 1 complete female [ MVMA] on F. Walker-style card without an original label, labeled later: “NATIONAL MUSEUM VICTORIA 50717 Anaphes acuminatus Europe ”. This female was not examined by Graham (1972) as it was in the different part of the MVMA collection but there is little doubt that it was one of the original syntype specimens.

Material examined. DENMARK. HOVEDSTADEN, Dyrehaven ( Jaegersborg Dyrehave , Zealand Island): 30.viii.1927, J.P. Kryger [1 3, ZMUC]; Fortunens Indelukke, O. Bakkendorf : 15.ix.1927 [1 Ƥ, ZMUC]; 23.ix.1927 [1 3, ZMUC]; 20.ix.1929 [1 Ƥ, ZMUC]. GERMANY. NORTH RHINE-WESTPHALIA, Aachen [1 3, NHMW] (paralectotype of G. ater Foerster ). UK. ENGLAND: London Borough of Richmond upon Thames: Richmond , 7.ix.1910, C.O. Waterhouse [1 Ƥ, USNM]. Richmond Park, J.S. Noyes: 28.vii.1995 [3 Ƥ, CNCI]; 15.viii.1997 [4 Ƥ, 1 3, CNCI, UCRC]. Suffolk Co., Minsmere Reserve , 23.viii.1975, J.S. Noyes [1 Ƥ, BMNH] (det. M.J. Matthews). Surrey Co.: Chobham Common , 26.viii.1982, J.S. Noyes [1 Ƥ, BMNH] (det. M.J. Matthews). Dorking, Leith Hill , 26.viii.1984, J.S. Noyes [1 Ƥ, BMNH] (det. M.J. Matthews). West Sussex Co., Kingley Vale National Nature Researve , 3.ix.1981, J.S. Noyes [1 Ƥ, BMNH] (det. M.J. Matthews).

Distribution. PALAEARCTIC: Czech Republic ( Noyes 2012), Denmark, Germany *, Slovakia ( Noyes 2012), and UK ( England).

Redescription. FEMALE (paralectotype and non-type specimens). Body length 1220–1540 µm. Body dark brown to black, antenna mostly brown or dark brown, legs light to dark brown.

Face with fine sculpture particularly conspicuous between toruli ( Fig. 50 ). Antenna ( Fig. 51 ) with radicle 0.3–0.32× total length of scape, rest of scape about 3.3× as long as wide, with cross-sculpture; pedicel longer than F1; F1–F4 each shorter than following segments and F2–F4 progressively a little longer than preceding funicle segment, F5–F8 more or less subequal in length but F8 a little wider than preceding funicle segments; mps usually on F5 (1 or 2), F6 (2 or 3), F7 (2 or 3), and F8 (4 or 5) [but according to Matthews (1986) their number may also vary as follows (although I did not see that in his specimens): F6 (0–3) and F8 (3–5)]; clava 3.2–3.5× as long as wide, a little longer than combined length of F7 and F8, normally with 10 mps but sometimes with as many as 11 or 12 mps (up to?15 mps according to Matthews (1986) but that needs verification because I counted at most 12 mps among the the four female specimens on slides at BMNH mounted very well by him).

Mesosoma ( Fig. 53 ). Propodeum ( Fig. 52 ) with submedian lines wide apart. Fore wing ( Fig. 54 ) 2.7–2.9× as long as wide; longest marginal seta 0.21–0.23× maximum wing width. Fore wing disc almost hyaline, mostly bare behind submarginal vein and with rather large, distinct bare area between marginal vein and cubital row of setae. Hind wing ( Fig. 54 ) 15–19× as long as wide; disc almost hyaline, unevenly setose; longest marginal seta 1.9– 2.4× maximum wing width.

Metasoma ( Fig. 53 ) notably longer than mesosoma. Petiole 2–3× as wide as long. Ovipositor occupying at least about 0.9× length of gaster, markedly exserted beyond its apex (by about 0.2× own length); ovipositor length: mesotibia length ratio 2.8–3.0:1.

Measurements of the paralectotype (µm). Body: 1220.

MALE. Body length 1200–1520 µm (slide-mounted specimens). Similar to female except for normal sexually dimorphic features and the following. Antenna as in Fig. 55 , scape with cross-ridges. Fore wing ( Fig. 56 ) 2.5–2.7× as long as wide. Genitalia as in Fig. 57 .

Diagnosis. Gonatocerus acuminatus is recognized by the following combination of features: antenna in female ( Fig. 51 ) with mps normally on F5–F8 (F8 usually with 4 or 5 mps), fore wing in female 2.7–2.9× as long as wide with a rather large, distinct bare area on the disc between the marginal vein and the cubital row of setae in both sexes ( Figs 54 , 56 ), and the ovipositor 2.8–3.0× length of mesotibia.

Hosts. Unknown.

Figures

FIGURES 50 – 52. Gonatocerus (Lymaenon) acuminatus Ƥ (50, 51 — Chobham Common, England; 52 — Richmond Park, England): 50, head; 51, antenna; 52, dorsellum and propodeum.

FIGURES 53, 54. Gonatocerus (Lymaenon) acuminatus Ƥ (53 — Richmond Park, England; 54 — Chobham Common, England): 53, mesosoma and metasoma; 54, wings.

FIGURES 55 – 57. Gonatocerus (Lymaenon) acuminatus 3 (Richmond Park, England): 55, antenna; 56, fore wing; 57, genitalia.