Gonatocerus (Gastrogonatocerus) margiscutum Girault, 1914

Triapitsyn, Serguei V., Huber, John T., Logarzo, Guillermo A., Berezovskiy, Vladimir V. & Aquino, Daniel A., 2010, Review of Gonatocerus (Hymenoptera: Mymaridae) in the Neotropical region, with description of eleven new species, Zootaxa 2456, pp. 1-243 : 63-68

Gonatocerus (Gastrogonatocerus) margiscutum Girault, 1914

( Figs 106–118 )

Gonatocerus margiscutum Girault 1914: 150 –151. Type locality: San Bernardino , Paraguay . Lymaenon (Gastrogonatocerus) dimorphus Ogloblin 1938a: 95 , 99 (illustrations), 101–105, 106 (key). Type locality: Apostoles , Misiones, Argentina. Syn. n.

Lymaenon (Gastrogonatocerus) dimorphus Ogloblin: Ogloblin 1938b : 29 (mentioned).

Lymaenon (Gastrogonatocerus) monrosi Ogloblin 1959a: 185 –188. Type locality: Bella Vista , Buenos Aires, Argentina. Syn. n.

Gonatocerus dimorphus (Ogloblin) : Costa Lima 1962: 196; Yoshimoto 1990: 40 (listed in membraciphagus species group); Luft Albarracin et al. 2009: 9 (list; distribution and host association in Argentina).

Gonatocerus (Gastrogonatocerus) dimorphus (Ogloblin) : De Santis & Esquivel 1967: 100 (list); De Santis 1967: 106 (catalog).

Gonatocerus (Gastrogonatocerus) monrosi (Ogloblin) : De Santis 1967: 106 (catalog).

Lymaenon dimorphus Ogloblin : De Santis et al. 1973: 43 –44 (record from Curitiba, Paraná, Brazil); De Santis 1980: 148 (catalog); Loiácono et al. 2005: 13 (type information).

Gonatocerus (Gonatocerus) margiscutum Girault : De Santis 1979: 366 (catalog).

Gonatocerus margiscutum Girault : Yoshimoto 1990: 40 (list).

Gonatocerus monrosi (Ogloblin) : Yoshimoto 1990: 40 (listed in membraciphagus species group); Luft Albarracin et al. 2009: 10 (list; distribution in Argentina).

Lymaenon monrosi Ogloblin : Loiácono et al. 2005: 17 (type information).

Type material examined. Lectotype male of Gonatocerus margiscutum [ ZMHB], here designated to avoid confusion about the status of the type specimens of this species, on slide labeled: 1. “ Gonatocerus margiscutum Gir. ♂ types.”; 2. [red] “ Type ”; 3. “31962”. The lectotype (left specimen, circled in black ink) is poorly mounted dorsoventrally ( Fig. 115 ), missing two apical flagellomeres of one antenna and F11 of the other antenna. One paralectotype male is under the same coverslip with the lectotype; only the body (without head), one forewing, and several legs (one detached) remain. According to Girault (1914, p. 150), the two original syntypes were remounted by him in xylol-balsam from minuten pins bearing the labels “4389. San Bernardino. K. Fiebrig S. V. IX. 9. ”.

Lectotype female of Lymaenon (Gastrogonatocerus) dimorphus [MLPA], here designated to avoid confusion about the status of the type specimens of this species, on slide labeled: “ Gastrogonatocerus dimorphus A. O. ♀ Apostoles, Mis 16.I.1937. A. A. O. Huevos de Kronid. decumbens . [cachleatum – co] sobre Eryngium . [Fig. – ip, iR]”. The lectotype, although not sufficiently cleared, is perfectly spread out, in a very good condition, mounted dorsoventrally. Paralectotypes [all MLPA]: 1 ♂ on the same slide and under the same coverslip with the lectotype; 1 ♀ and 1 ♂ on slide labeled: “ Gastrogonatocerus dimorphus A. O. ♀ Apostoles, Mis 16.I.1937. Huevos de Kronid. decumbens sobre Eryngium .”. Also 2 females and 2 males on slides, with the same data as the lectotype, listed as syntypes by Loiácono et al. (2005). Lymaenon (Gastrogonatocerus) dimorphus was described from 6 female and 5 male syntypes; the whereabouts of the remaining 2 female and 1 male paralectotypes not mentioned above are unknown.

Holotype female of Lymaenon (Gastrogonatocerus) monrosi [ MLPA], on slide labeled: 1. “ Lymaenon ♀ Gastrogonatoce-rus monrosi Det. A. Ogloblin Holotypus. Bella Vista. Pcia. B. Aires. 12.XII.1957. A. A. O.”; 2. [original label ip] “ Holotypus Gastrogonatocerus meridionalis [emn] A. O. ♀ B Vista 8.xii.57 ”; 3. “3879”. The holotype, although uncleared, is in very good condition, perfectly spread out, and mounted dorsoventrally. One paratype female [ MLPA] on slide, with the same data as the holotype except collected on 9.xii.1957, listed by Loiácono et al. (2005) as possibly belonging to the type series of this species. Lymaenon (Gastrogonatocerus) monrosi was described from 2 females (the holotype and a paratype) and 4 male paratypes including the allotype; the whereabouts of these males are unknown.

Material examined. ARGENTINA. FORMOSA, 26.27°S 58.27°W, 60 m, 26.iii.2003, J. Munro [1 ♂, UCRC] .

Redescription. FEMALE (lectotype and paralectotype of G. dimorphus and holotype of G. monrosi ). Body length 867–1322 µm. Body and appendages light brown to brown, flagellum somewhat darker.

Antenna ( Figs 106 , 110 ) with radicle about 0.2x total length of scape, rest of scape 2.6x as long as wide; pedicel longer than F1; F1–F4 short, subequal, and without mps; F5–F8 longer, subequal in length, and each with 2 mps; clava with at least 8 mps, 3.0–4.0x as long as wide, a little longer than combined length of F6–F8.

Mesosoma ( Figs 107 , 111–113 ). Mesoscutum and scutellum with weak sculpture; propodeum smooth; propodeal spiracle not very large although perhaps somewhat larger than normal in size. Forewing ( Figs 108 , 109 ) 2.9–3.2x as long as wide; longest marginal seta about 0.2x maximum wing width; forewing disc almost hyaline, bare behind and just beyond venation except for 2 setae behind stigmal vein, apical 0.6 or so of disc setose. Hind wing ( Figs 108 , 109 ) 13–15x as long as wide; disc with 2 rows of setae along margins and with a few scattered short setae, almost hyaline; longest marginal seta 1.5–1.8x maximum wing width.

Petiole much wider than long; gaster longer than mesosoma; ovipositor ( Figs 107 , 111–113 ) long, 2.7– 3.1x length of mesotibia, projecting strongly forward under mesosoma (at least as far as procoxa) and not exserted beyond apex of gaster.

MALE (lectotype and paralectotype of G. margiscutum and 2 paralectotypes of G. dimorphus ). Body length 1175–1298 µm. Similar to female except for normal sexually dimorphic features and the following. Antenna ( Fig. 114 ) with scape plus radicle 2.1–2.3x as long as wide. Mesosoma as in Fig. 116 . Forewing ( Fig. 117 ) 2.8–3.0x as long as wide. Genitalia as in Fig. 118 .

Measurements (µm) of the lectotype of G. margiscutum . Total body length: 1298. Antenna: scape 91; pedicel 51; F1 118; F2 121; F3 124; F4 124; F5 124; F6 121; F7 121; F8 121; F9 121; F10 116. Forewing 621:209; longest marginal seta 40. Hind wing 485:31; longest marginal seta 55.

Diagnosis. Gonatocerus (Gastrogonatocerus) margiscutum is characterized by the following unique combination: female antenna ( Figs 106 , 110 ) with F1–F4 short, without mps, and F5–F8 longer, subequal in length, each with 2 mps; forewing ( Figs 108 , 109 ) hyaline, mostly bare behind and just beyond venation; and ovipositor long (2.7–3.1x as long as mesotibia), projecting strongly forward under mesosoma (at least as far as procoxa) and not exserted beyond apex of gaster ( Figs 107 , 111-113 ).

Distribution. NEOTROPICAL: Argentina *, Brazil * ( De Santis et al. 1973) [as Lymaenon dimorphus ], and Paraguay.

Host. Kronides incumbens (Germar) (Membracidae) ( Ogloblin 1938a [as Kronides decumbens (sic)] for Lymaenon (Gastrogonatocerus) dimorphus ; De Santis et al. 1973 [as Kronides incumbes (sic)] for Lymaenon dimorphus ).

Comments. One small female specimen in UCRC (from Argentina, Tucumán, W of Tapia , 26°33’54’’S 65°17’22’’W, 720 m, 17–19.iii.2007, J.M. Heraty) may or may not belong to this species – it lacks mps on F6.

Figures

FIGURES 106 – 108. Gonatocerus (Gastrogonatocerus) margiscutum ♀ (paralectotype of G. dimorphus): 106, antenna; 107, body; 108, wings.

FIGURES 109, 110. Gonatocerus (Gastrogonatocerus) margiscutum ♀ (holotype of G. monrosi): 109, wings; 110, antenna.

FIGURES 111 – 113. Gonatocerus (Gastrogonatocerus) margiscutum ♀ (holotype of G. monrosi), body: 111, dorsal view; 112, dorsoventral (intermediate) view; 113, ventral view.

FIGURES 114 – 118. Gonatocerus (Gastrogonatocerus) margiscutum ♂ (114, 116 – 118 – 26.27 ° S 58.27 ° W, S of Formosa, Formosa, Argentina; 115 – lectotype): 114, antenna; 115, body; 116, scutellum, dorsellum, and propodeum; 117, forewing; 118, genitalia.