Gonatocerus (Cosmocomoidea) oxypygus Foerster, 1856,

Triapitsyn, Serguei V., 2013, Review of Gonatocerus (Hymenoptera: Mymaridae) in the Palaearctic region, with notes on extralimital distributions, Zootaxa 3644 (1), pp. 1-178: 150-161

publication ID

http://dx.doi.org/10.11646/zootaxa.3644.1.1

publication LSID

lsid:zoobank.org:pub:DF42B735-9A47-48D5-B382-F6A980563914

DOI

http://doi.org/10.5281/zenodo.3503175

persistent identifier

http://treatment.plazi.org/id/DC2687A4-E5A9-FF04-68CC-082D1E51583C

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scientific name

Gonatocerus (Cosmocomoidea) oxypygus Foerster, 1856
status

 

Gonatocerus (Cosmocomoidea) oxypygus Foerster, 1856 

( Figs 283–303View FIGURES 283, 284View FIGURES 285 – 287View FIGURES 288, 289View FIGURES 290 – 292View FIGURES 293 – 295View FIGURE 296View FIGURES 297 – 299View FIGURES 300 – 302View FIGURE 303)

Gonatocerus oxypygus Foerster 1856: 118  . Female [lost from NHMW], type status not indicated. Type locality: unknown for both the lost type material and the neotype designated here (Europe, most likely Germany: Kirchner (1867) indicated Aachen as the original type locality).

Gonatocerus oxypygus Förster  : Kirchner 1867: 201 (catalog); Kryger 1934: 503 (mentioned); Graham 1982: 224 (comments).

Gonatocerus ovicenatus Leonard & Crosby 1915: 545  , 546 (illustrations). Type locality: Ithaca, Tompkins Co., New York, USA. Syn. n.

Lymaenon oxypygus (Förster)  : Debauche 1948: 81 (list).

Lymaenon ovicenatus (Leonard & Crosby)  : Burks 1958: 63 (catalog); Peck 1963: 25 (catalog); Viggiani 1969: 46 –48 (comments, records from Campania, Italy, host associations, redescription, illustrations); Viggiani 1988: 563 (host association); Viggiani & Jesu 1988: 1023 (host association).

Lymaenon tremulae Bakkendorf  : Hincks 1960: 210 (in part, see “Material examined” below); Viggiani 1988: 562–564 (illustration of male genitalia, host association); Viggiani & Jesu 1988: 1023 (host association).

Lymaenon megalura Mathot 1969: 2  (list), 8 –9, 10 (key). Type locality: Leuven (Canal, as Louvain in the original description), Flemish Brabant, Belgium. Syn. n.

Gonatocerus tremulae (Bakkendorf)  : Matthews 1986: 222 (in part, misidentification of non-type specimens from England, see “Material examined” below); Donev 2001: 31 (record from Turkey); Donev 2005: 383 –384 (diagnosis, distribution); Pricop 2010 b: 114 –116 (illustrations), 117 (valid species, diagnosis, distribution – but see comments under G. tremulae  about misidentification).

Gonatocerus ovicenatus Leonard & Crosby  : Huber 1988: 59 –60 (member of the ater  species group, subsequent references, lectotype designation, diagnosis, redescription, host associations, records from Iran); Baquero & Jordana 2003: 16 –18 (synonymy, diagnosis, redescription, distribution, host associations); Pricop 2009 a: 73 –74 (records from Romania); Pricop 2009 b: 123, 125 (records from Romania, illustration); Huber et al. 2009: 271 (list); Pricop 2010 a: 81 (records from Romania); Pricop 2010 b: 113, 117 (diagnosis, distribution), 114–116 (illustrations).

Gonatocerus megalura (Mathot)  : Donev 1988 d: 194 –195 (distribution).

Type material examined. Gonatocerus oxypygus Foerster  : neotype female [ MHNG], here designated in accordance with Article 75.3 ([ ICZN] 1999) to avoid ambiguity regarding the identity of this species, to define the nominal taxon objectively and clarify its taxonomic status, and because the original type material of this species is lost. The neotype is on a slide ( Fig. 283View FIGURES 283, 284) labeled (the original label in?A. Foerster’s handwriting): “ Gonatocerus caudatus Frst.  ” [Foerster’s manuscript name]. The neotype of G. oxypygus  was remounted in Canada balsam at UCRC from an A. Foerster-style original mount on a minuten pin, one of two that were inserted in the same small balsa wood piece on a pin also labeled more recently in blue ball pen ink: “ Gonatocerus caudatus  F.”. The neotype lacks F 6 –F 8 and clava of one antenna ( Fig. 285View FIGURES 285 – 287) and approximately apical halves of both ovipositor sheaths ( Fig. 286View FIGURES 285 – 287), which are broken off, and also one fore leg and the apical part of one fore wing, but otherwise is in fair condition: it cleared surprisingly well considering that it is probably at least 150 years old. I searched for the type specimen(s) of G. oxypygus  in A. Foerster’s collection during a visit to the NHMW in June 2007 and confirm that this (or these) has (have) been lost, hence the neotype designation.

Gonatocerus ovicenatus Leonard & Crosby  : lectotype female on point [ CUIC], designated by Huber 1988: 59. Label data of the lectotype as indicated by Huber (1988) plus a red label “ LECTOTYPE Gonatocerus ovicenatus Leonard & Crosby Des. Huber 1987  ”. Also 1 male paralectotype on point (originally labeled as an “allotype”) and 1 female and 1 male paralectotypes on slides [all CUIC]; the slides are labeled as follows: 1. “ Cornell University No. [443 (male) or 444 (female), followed by 3 or Ƥ symbols, respectively] SUB. SL. Gonatocerus ovicenatus Leonard & Crosby. Reared  from eggs of Idiocerus gemmisimulans Leonard & Crosby Ithaca N. Y.  DATE May 20, 1915 Paratype ”; 2. “ PARATYPE Cornell U. No. 443 ” (male) or “ 444 ” (female).

Gonatocerus megalura (Mathot)  : holotype female of Lymaenon megalura  [ ISNB] on slide ( Fig. 288View FIGURES 288, 289) labeled: 1. “Louvain (Canal) 12.VIII. 43 (Roseaux). no 296 ”; 2. “Dr. H. Debauche det. Lymaenon megalura Deb. Ƥ  Type ”. The holotype ( Fig. 289View FIGURES 288, 289) is in poor condition: insufficiently cleared, almost complete (lacking F 2 –F 8 and clava of one antenna and also some leg segments), and mounted laterally, with one fore wing and both hind wings folded and mostly obscured.

Material examined. BULGARIA. BLAGOEVGRAD, Rila Mt., Bodrost, 1200 m, 27.vii. 1984, A. Donev [1 Ƥ, PUPB] (det. by A. Donev as G. tremulae  ). SOFIA, Bankya, 26.v. 1980, D. Kostadinov [1 Ƥ, PUPB] (det. by A. Donev as G. tremulae  ). GERMANY. BAVARIA, Munich, 23.vii. 1958, E. Schmitscheck (“ex. Idiocerus decimaquartus  ”) [1 Ƥ, 1 3, and 2 damaged specimens of unknown sex, BMNH]. NORTH RHINE-WESTPHALIA:?Aachen [1 Ƥ, NHMW] (paralectotype of G. ater  , Figs 290–292View FIGURES 290 – 292). Cologne, M. Boness: 30.vii. 1962 [3 Ƥ, 3 3, NHMW]; 6.viii. 1962 [1 Ƥ, NHMW]; 20.ix. 1962 [1 Ƥ, NHMW]. Leverkusen, M. Boness: 16.x. 1962 (on Rumex obtusifolius  at Rhine River bank) [2 Ƥ, NHMW]; 16.x. 1962 (on Salix  sp. at Rhine River bank) [2 Ƥ, NHMW]. GREECE. CENTRAL MACEDONIA, Lake Kerkini, Kerkini Marsh, 41 ° 13 ’ 32.8 ’’N 23 °05’04.2’’E, 45 m, G. Ramel: 28.iii – 3.iv. 2007 [1 Ƥ, UCRC]; 1–17.iv. 2007 [1 Ƥ, BMNH]. HUNGARY. BÁCS-KISKUN, Kelebia, 3.v. 1949, J. Erdös [1 Ƥ, NHMW / HNHM]. IRAN. ZANJAN, 30 km W of Zanjan on Tabriz road, 9.vi. 1978, J.T. Huber (sweeping understory in poplar grove) [2 Ƥ, BMNH, UCRC] (det. by J.T. Huber as G. ovicenatus  ).

ITALY. PIEDMONT, Turin Prov., Pessione, 21.viii. 1984, Tronellini (“ex. Rhytidodus decimusquartus  on Populus euroamericana  ”) [2 Ƥ, DEZA] (det. by G. Viggiani as Lymaenon tremulae  ). ROMANIA. [ MOLDOVA], Botoşani Co., Cucoräni, 2.ix. 2006, E. Pricop [1 Ƥ, EPPC] (det. by E. Pricop as G. tremulae  ). RUSSIA. LENINGRADSKAYA OBLAST’, Radchenko [Railway Station], 10.ix. 1978, V.A. Trjapitzin [1 Ƥ, ZIN]. STAVROPOL’SKIY KRAY, Prietokskiy, V.V. Kostjukov: 28.viii. 2002 [5 Ƥ, UCRC]; 29.viii. 2002 [1 Ƥ, 1 3, UCRC]; 14.vii. 2003 [4 Ƥ, 1 3, UCRC]; 7.viii. 2003 [3 Ƥ, UCRC]; 12.viii. 2003 [15 Ƥ, 6 3, UCRC, ZIN]; 14.viii. 2003 [2 Ƥ, UCRC]. TURKEY. SAKARYA, Karasu, 21.vii. 1997, A. Donev [1 Ƥ, PUPB] (det. by A. Donev first as G. tremulae ( Donev 2001)  and then as G. ovicenatus  ). UK. ENGLAND: Buckinghamshire Co., Burnham Beeches, Z. Bouček (det. as G. tremulae  by Z. Bouček and M.J. Matthews): 25.viii. 1974 [5 Ƥ, BMNH]; 14.ix. 1974 [6 Ƥ, BMNH]. East Riding of Yorkshire Co., Allerthorpe Common, 1.ix. 1953, W.D. Hincks [1 Ƥ, MMUE] (det. as L. tremulae  by W.D. Hincks and as G. tremulae  by M.J. Matthews). Surrey Co., Dorking, Leith Hill, 26.viii. 1984, J.S. Noyes [1 Ƥ, BMNH] (det. as G. tremulae  by M.J. Matthews). Country or locality not indicated (most likely Aachen area, NORTH RHINE-WESTPHALIA, GERMANY): 1 Ƥ, potential paralectotype of G. ater Foerster  [ MHNG] (label information listed under G. ater  ). 1 Ƥ [ MHNG] on minuten pin originally labeled: 1. [in?A. Foerster’s handwriting, the original label now glued onto the neotype slide] “ Gonatocerus caudatus Frst.  ” [Foerster’s manuscript name]; 2. [in blue ball pen ink, recent label] “ Gonatocerus caudatus  F.”. 1 Ƥ [ MHNG] on a minuten pin inserted in a small balsa wood piece on a pin labeled: 1. [in?Foerster’s handwriting] “ Gonatocerus ecaudatus Frst.  ” [Foerster’s manuscript name]; 2. [in blue ball pen ink] “ Gonatocerus ecaudatus  F.” (mounted together, but on separate minuten pins, with 2 females of G. ater  s. l.). 1 Ƥ [ MHNG] on a minuten pin piece glued to a small balsa wood piece on a pin labeled: 1. [in Foerster’s handwriting] “ Cosmocoma diversicornis Frst.  ” [Foerster’s manuscript name]; 2. [in blue ball pen ink] “ Cosmocoma diversicornis  F”.

Extralimital records. USA. NEW YORK, Ontario Co., Geneva, 42 ° 52 ’ 46 ’’N 77 °00’ 40 ’’W, 185 m (on Lombardy poplar, Populus nigra  , roadside of County Road 6): 3.viii. 2010, S.V. Triapitsyn [2 Ƥ, 4 3, UCRC]; 23.ix. 2010, S.V. Triapitsyn, G. Loeb [4 Ƥ, UCRC].

Distribution. PALAEARCTIC: Belgium *, Bulgaria ( Donev 1988 d [as G. megalura  ], 2005 [as G. tremulae  ]), Germany, Greece *, Hungary *, Iran ( Huber 1988; Fallahzadeh & Huber 2011) [as G. ovicenatus  ], Italy ( Viggiani 1969 [as Lymaenon ovicenatus  ]; Viggiani 1988 [also as Lymaenon tremulae  ]; Viggiani & Jesu 1988 [also as L. tremulae  ]), Netherlands ( Noyes 2012 [as G. ovicenatus  ]), Romania ( Pricop 2009 a, 2010 a, b [as G. ovicenatus  and (2010 b only) also as G. tremulae  ), Russia *, Spain ( Baquero & Jordana 2003 [as G. ovicenatus  ]), Turkey ( Donev 2001 [as G. tremulae  ]), and UK ( England) ( Hincks 1960 [as L. tremulae  , in part]; Matthews 1986 [as G. tremulae  ]; Baquero & Jordana 2003 [as G. ovicenatus  ]). NEARCTIC: USA (New York). This Palaearctic species was apparently unintentionally introduced with poplars (hosts of the Idiocerinae  ) into the USA ( Huber 1988); however, Baquero & Jordana (2003) later noted, without providing any data, that G. ovicenatus  was probably not established there. Here I confirm establishment of G. oxypygus  in North America (see “Extralimital records”). Populus nigra  is an introduced species in North America; at the same time my attempts to collect G. oxypygus  in upstate New York on Eastern cottonwood, Populus deltoides  , which is native to North America, failed ( Shackford 2012).

Redescription. FEMALE (neotype of G. oxypygus  , holotype of Lymaenon megalura  , paralectotype of G. ater  , and non-type specimens from the Palaearctic region). Body length 930–1300 µm. Body ( Figs 289View FIGURES 288, 289, 291View FIGURES 290 – 292) dark brown to black, appendages mostly brown to dark brown.

Antenna ( Figs 285View FIGURES 285 – 287, 290View FIGURES 290 – 292, 293View FIGURES 293 – 295, 297View FIGURES 297 – 299) with radicle 0.24–0.3 × total length of scape, rest of scape 2.3–3.2 × as long as wide; pedicel longer than F 1; F 1 the shortest funicle segment, F 3 a little longer than F 2 or F 4, F 5 the longest funicle segment, the following funicle segments usually each progressively slightly shorter than preceding one except F 6 sometimes as long as or shorter than F 7; mps on F 3 (usually 0, rarely 1), F 5 (usually 2, occasionally 1), F 6 (1 or 2), F 7 (2), and F 8 (2); clava with 8 mps, 2.6.– 3.4 × as long as wide, at least a little (usually notably) shorter than combined length of F 6 –F 8. In the extralimital female paratype of G. ovicenatus  , F 5 bears only 1 mps and F 6 lacks mps.

Mesosoma ( Figs 289View FIGURES 288, 289, 291View FIGURES 290 – 292, 298View FIGURES 297 – 299) shorter than metasoma. Propodeum ( Figs 284View FIGURES 283, 284, 294View FIGURES 293 – 295) with fine, subparallel, submedian carinae close to each other and usually not extending to anterior margin of propodeum. Fore wing ( Figs 287View FIGURES 285 – 287, 292View FIGURES 290 – 292, 296View FIGURE 296, 299View FIGURES 297 – 299) 2.7–2.9 × as long as wide; longest marginal seta 0.18–0.23 × maximum wing width; disc almost hyaline, bare behind venation except for 1–3 setae just behind stigmal vein. Hind wing ( Figs 292View FIGURES 290 – 292, 296View FIGURE 296) 12–14 × as long as wide; disc almost hyaline; longest marginal seta 1.4 –2.0× maximum wing width.

Metasoma ( Figs 289View FIGURES 288, 289, 291View FIGURES 290 – 292, 298View FIGURES 297 – 299). Petiole about 0.3 × as long as wide, narrower basally than apically. Ovipositor occupying from about 0.9 × to entire length of gaster ( Figs 286View FIGURES 285 – 287, 289View FIGURES 288, 289, 291View FIGURES 290 – 292, 295View FIGURES 293 – 295, 298View FIGURES 297 – 299) and sometimes projecting forward under petiole and occasionally under posterior part of propodeum, and markedly exserted beyond gastral apex (by 0.2–0.4 × own length), 2.6–3.1 × as long as mesotibia; when very long, ovipositor and/or ovipositor sheaths often a little bent down apically ( Figs 289View FIGURES 288, 289, 295View FIGURES 293 – 295).

Measurements (µm) of the neotype. Head: 203; mesosoma 406; gaster 707; ovipositor 1070. Antenna: scape minus radicle 100; pedicel 55; F 1 32; F 2 47; F 3 61; F 4 53; F 5 73; F 6 61; F 7 64; F 8 51; clava 150. Fore wing 1218: 437; longest marginal seta 100. Hind wing width 73; longest marginal seta 121.

MALE (specimens from the Palaearctic region). Body length 950–1140 µm. Similar to female including the shape of submedian carinae on the propodeum ( Fig. 301View FIGURES 300 – 302) except for normal sexually dimorphic features and the following. Body brown to dark brown, antenna mostly brown, legs light to dark brown. Antenna ( Fig. 300View FIGURES 300 – 302) with scape very short, about 1.8 × as long as wide, pedicel very small. Fore wing ( Fig. 303View FIGURE 303) 2.6–2.9 × as long as wide; hind wing ( Fig. 303View FIGURE 303) about as wide as in female. Genitalia ( Fig. 302View FIGURES 300 – 302) large, about 0.75 × length of gaster.

Diagnosis. Gonatocerus oxypygus  is readily distinguishable from all other Palaearctic species of the subgenus by the combination of the fine, subparallel, submedian propodeal carinae that are close to each other and usually not extending to anterior margin of propodeum ( Figs 284View FIGURES 283, 284, 294View FIGURES 293 – 295, 301View FIGURES 300 – 302), and a markedly exserted ovipositor often a little bent down apically ( Figs 286View FIGURES 285 – 287, 289View FIGURES 288, 289, 291View FIGURES 290 – 292, 295View FIGURES 293 – 295, 298View FIGURES 297 – 299).

Also see Huber (1988) and Baquero & Jordana (2003) for the diagnoses of G. ovicenatus  , as well as G. tremulae  , below.

Hosts. Populicerus  sp. [as Idiocerus  sp.] in Italy ( Viggiani 1969 [as Lymaenon ovicenatus  ]), and Rhytidodus decimaquartus (Schrank)  in the USA ( Leonard & Crosby 1915 [as G. ovicenatus  ]; Peck 1963 [as L. ovicenatus  ]; Huber 1988 [as G. ovicenatus  ]) [as Idiocerus gemmisimulans Leonard & Crosby  , Idiocerus scurra (Germar)  , and Rhytidodus decimasquartus (Schrank)  , respectively] ( Cicadellidae  : Idiocerinae  ). Viggiani (1988) and Viggiani & Jesu (1988) also indicated R. decimaquartus  [as R. decimusquartus  ] as the host of L. ovicenatus  (also as the misidentified L. tremulae  ) in Italy. Also see Peck (1951) and Burks (1958).

Comments. Although the very short original diagnosis is not very helpful to determine the true identity of G. oxypygus  , the indication ( Foerster 1856, p. 118) that it differs from G. longicornis Nees  ab Esenbeck “by its brownish legs and a strongly projecting ovipositor equaling almost to 1 / 3 of abdomen [i.e., gaster] length” (translation from German) makes it possible to determine beyond the reasonable doubt that G. oxypygus  is conspecific with G. ovicenatus  . Although Graham (1982) thought that G. oxypygus  might be the same as G. novickyi  and also G. fossarum  (a synonym of G. novickyi  ), I consider the latter possibility much less likely because of its different, distinctive body color pattern; I found no specimens of G. novickyi  (apparently an uncommon species in Europe) in the A. Foerster collection at NHMW. At the same time specimens of the species we know as G. ovicenatus  are present among his mymarids both in NHMW and MHNG and fit the original diagnosis of G. oxypygus  well. Therefore, as first reviser, I select a neotype of G. oxypygus  from one of Foerster’s specimens in MHNG conspecific with G. ovicenatus  and synonymize the latter under the earlier described G. oxypygus  . Foerster’s specimens of Mymaridae  found their way to MHNG via Gustav L. Mayr from Vienna ( Huber & Fidalgo 1997) and very likely were collected in the Aachen area, North Rhine-Westphalia, Germany, the probable type locality of G. oxypygus  . Most if not all of Foerster’s specimens from Aachen area were apparently collected by Foerster himself; although most of his specimens of Mymaridae  in NHMW have printed labels “Coll. G. Mayr” on them, these were probably added later either by G.L. Mayr himself or, more likely, by a curator there simply because they came from Mayr’s collection but not necessarily because he collected them himself.

The holotype female of Lymaenon megalura  is a typical G. oxypygus  as treated here, a species which apparently was not known to H.R. Debauche and G. Mathot. Mathot’s confusion most likely was the result of how the holotype of L. megalura  had been mounted: he apparently failed to recognize the correct shape of the dorsellum because of the lateral mount, and also one of its fore wings is folded in such a way that its apical part is positioned over the base of the other fore wing, thus creating a false impression that the fore wing disc is setose behind the marginal vein ( Fig. 289View FIGURES 288, 289). Therefore, in his key to species of Lymaenon  , G. megalura  can only be reached if one incorrectly assumes it does not have a rhomboidal dorsellum.

NHMW

Naturhistorisches Museum, Wien

MHNG

Museum d'Histoire Naturelle

UCRC

University of California, Riverside

CUIC

Cornell University Insect Collection

SUB

Universitat Bonn

HNHM

Hungarian Natural History Museum (Termeszettudomanyi Muzeum)

DEZA

Dipartimento di Entomologia e Zoologia Agraria dell'Universita

ZIN

Russian Academy of Sciences, Zoological Institute, Zoological Museum

MMUE

Museum of Manchester University

NEW

University of Newcastle

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Mymaridae

Genus

Gonatocerus

Loc

Gonatocerus (Cosmocomoidea) oxypygus Foerster, 1856

Triapitsyn, Serguei V. 2013
2013
Loc

Gonatocerus ovicenatus

Pricop 2010: 81
Pricop 2010: 113
Pricop 2009: 73
Pricop 2009: 123
Huber 2009: 271
Baquero 2003: 16
Huber 1988: 59
1988
Loc

Gonatocerus megalura

Donev 1988: 194
1988
Loc

Gonatocerus tremulae

Pricop 2010: 114
Donev 2005: 383
Donev 2001: 31
Matthews 1986: 222
1986
Loc

Lymaenon megalura

Mathot 1969: 2
1969
Loc

Lymaenon tremulae

Viggiani 1988: 1023
Hincks 1960: 210
1960
Loc

Lymaenon ovicenatus

Viggiani 1988: 1023
Viggiani 1969: 46
Peck 1963: 25
Burks 1958: 63
1958
Loc

Lymaenon oxypygus (Förster)

Debauche 1948: 81
1948
Loc

Gonatocerus ovicenatus

Leonard 1915: 545
1915
Loc

Gonatocerus oxypygus Förster

Graham 1982: 224
Kryger 1934: 503
Kirchner 1867: 201
1867
Loc

Gonatocerus oxypygus

Foerster 1856: 118
1856