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The Genus Methocha in Europe: a Discussion on Taxonomy, Distribution and Likely Origin of Its Known Species and Subspecies (Hymenoptera Tiphiidae Methochinae)

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The Genus Methocha in Europe: a Discussion on Taxonomy, Distribution and Likely Origin of Its Known Species and Subspecies (Hymenoptera Tiphiidae Methochinae) Bulletin of Insectology 58 (1): 35-47, 2005 ISSN 1721-8861 The genus Methocha in Europe: a discussion on taxonomy, distribution and likely origin of its known species and subspecies (Hymenoptera Tiphiidae Methochinae) Gian Luca AGNOLI Bologna, Italy Abstract An overview of the genus Methocha Latreille, 1804 in Europe is given, with a particular attention to the widespread species Methocha articulata (Latreille, 1792), to the problematic history of its scientific name and to its geographical distribution, pro- ducing a preliminary sketch map of presence. A review of the other taxa described from Europe and of the known biotopes of Methocha in Europe is provided. Then, the discovery of Methocha latronum (Guichard, 1972) on the shores of the Lake Baratz, the only natural basin of Sardinia, Italy, is reported. After its description as a Corsican endemite, M. latronum turns out to be a Corsican-Sardinian endemite and the genus Methocha is represented in Italy, as well as in France, by the continental species M. articulata and the insular species M. latronum. A morphological comparison between M. latronum and M. articulata is per- formed, in order to verify the validity of the former species. M. latronum shows relevant morphological differences from M. ar- ticulata: denser punctuation, longer pubescence, coarser surface sculpture, not shining and not polished general appearance, cly- peus without any tubercle, pronotum with long depression, hidden propodeal spiracles, reddish gastral metamere I and wider gas- tral metamere VI. Such differences let us consider M. latronum as a valid distinct species and an isolated vicariant of M. articu- lata. A proposition to throw light on the names of M. articulata and discussions on its supposed rarity, on the likely origin of M. latronum and on the European distribution of M. articulata are also given. Key words: Methocha articulata, Methocha ichneumonides, Methocha latronum, Europe, Italy, Sardinia. Introduction articulata, ichneumonides) used for the widespread European species of Methocha. Then, the geographical With the present note we start to investigate the status of distribution of the species is examined, through the Methocha Latreille, 1804 in Europe, and, in particular, analysis of the Literature data and of the data drawn of the widespread species M. articulata (Latreille, from public and private collections. The following acro- 1792), producing an interim sketch map of its European nyms are used for the public collections (in alphabetical distribution. The presence of the species in the different order): CUB - Comenius University, Bratislava; DISTA administrative divisions of Italy is also taken into ac- - Department of Agroenvironmental Sciences and Tech- count. Then, we deal with some biological aspects of nologies, Bologna; EMLU - Entomological Museum of the species in Europe, like the known biotopes, the phe- Lund University; FSPUO - Faculty of Science, Palacky nology and the sampling techniques. University, Olomouc; IEVU - Institute of Ecology of Additionally, we report the discovery of a female M. Vilnius University; MBS - Museum Bruckenthal, Sibiu; latronum (Guichard, 1972) at Lake Baratz near Alghero MCSNG - Museo Civico di Storia Naturale, Genova; (Sassari prov., NW Sardinia). This finding enriches the MCSNM - Museo Civico di Storia Naturale, Milano; Italian fauna with a most interesting species, previously MNCNM - Museo Nacional de Ciencias Naturales, Ma- known from Corsica (France) only, and the genus drid; MNHN - Muséum National d'Histoire Naturelle, Methocha turns out to be present in Italy, as well as in Paris; MZUR - Museo di Zoologia dell'Università, France, with M. articulata in the continent and M. Roma; MZW - Museum of Zoology, Warsaw; NHMB - latronum in the Tyrrhenian island. Natural History Museum, Bucharest; NHML - Natural A morphological comparison between M. latronum History Museum, London; OLLD - Oberoesterreichis- and M. articulata is provided, in order to verify the en- che Landesmuseen, Linz/Dornach; PMSL - Priro- tity of the morphological differences. Some notes on the doslovni Muzej Slovenije, Ljubljana; ZISP - Zoological likely hosts of M. latronum are also presented. Institute, St. Petersburg; ZMUC - Zoological Museum, Discussions on some open problems, on the taxo- University of Copenhagen. nomic validity of M. latronum and on its likely origin The second part of the study is centered on the mor- are also given. phological comparison between M. latronum and M. ar- ticulata. A stereoscopic microscope has been used for the exploration of M. latronum female and of 20 M. ar- Materials and methods ticulata females from Estonia (Männikvälia, Pugestu and Vagula, coll. V. Soon), Germany (Rheinland-Pfalz and The first part of our research has a bibliographical con- Baden-Württemberg, coll. C. Schmid-Egger), Czech Re- notation, performed in order to throw light on the prob- public ("Bohemia", coll. J. Straka), and Italy (Piedmont, lematic history of the taxonomical names (formicaria, coll. G. Pagliano, and Emilia-Romagna, A.’s coll.). Methocha articulata (Latreille, 1792) The debate between the valid name (Methocha articulata) and the accepted name ( Methocha ichneumonides) When we started to get involved with the present study it was not possible for us to avoid the problem of the name of this species, around which a historical confu- sion has grown and a debate among Entomologists was born. The problematic history of the name of this wasp is summarized as follows: 1792: Latreille, describes simultaneously the species for- micaria and articulata under the Genus Mutilla. 1804: Latreille, describes the Genus Methocha, but in- cludes the species articulata only. 1805: Latreille, writes the Genus name as Methoca and Figure 1. Interim sketch map of the western distribution from this moment the Author embraces this or- of Methocha articulata (Latreille). thography; the species articulata is renamed to ichneumonides and from this moment the name articulata disappears from Latreille's works. The following abbreviations are used: F-I, F-II, etc. = 1806: Latreille, describes Methoca mutillaria. antennal flagellomeres beyond the pedicel; MOD = me- 1807: Jurine, uses the combination Mutilla formicaria. dian ocellus diameter; S-I, S-II, etc. = gastral sterna; T- 1809: Latreille, describes Tengyra sanvitali (male). The I, T-II, etc. = gastral terga. The visible thorax, composed genus Methoca now comprises two species: ich- by the true thorax and the propodeum, is conventionally neumonides and, doubtfully, formicaria. As refer- named mesosoma; the visible abdomen, apart from the ence for the former, Latreille indicates not the propodeum, is named metasoma. original description (1792), but his work of 1805 and as synonyms he cites Mutilla formicaria Jurine and Methoca mutillaria Latreille, reported Results as a variety. For formicaria the Author reports the same diagnosis as in 1792, but a question mark is Overview of the genus Methocha Latreille, 1804 in put before its name. Europe The name Methocha Latreille, 1804 is the valid name for the genus. The adoption of the orthography Methoca The small Aculeate wasps of the genus Methocha (Family operated by the same Author starting from 1805 proba- Tiphiidae, subfamily Methochinae), are slender animals bly reflected a personal change of opinion, but it repre- with wingless, antlike females and winged males. They sents an unjustified emendation, according to the Inter- are well known worldwide to be specialized ectoparasi- national Code of Zoological Nomenclature. toids on larval tiger beetles (Coleoptera Cicindelidae) and At the species level, the name formicaria should have their biology is known for the field observations of many the priority on all the other names, because it was the Authors (Adlerz, 1903, 1905; Bouwman, 1908, 1909; first one used by Latreille in 1792, but we do not con- Reuter, 1913; Champion and Champion, 1914; Champion, sider it as the valid name. In fact, the original descrip- 1915; Champion, 1916; Trautmann, 1920; Bischoff, 1927; tion of 1792 reveals that the species M. formicaria was Pagden, 1925, 1926, 1932; Main, 1927, 1931; Hoffer, established on a specimen characterised by a very small 1936; Iwata, 1936; Budrick and Wasbauer, 1959; Grandi, size (about 3.5 mm), a red head, ocelli not described 1961; Krombein, 1982, inter alia). (contrary to M. articulata) and a bilobate thorax. These Among the subfamily Methochinae, the genus Metho- features, also reported in Latreille's later works, appar- cha, subgenus Methocha, is the only one present in the ently do not match with the characters commonly used Old World, with three species and two subspecies de- to identify this species. It is our adventurous opinion scribed so far from Europe: that M. formicaria has been established on a suspect Methocha articulata (Latreille, 1792), described specimen and we regard at it as a nomen dubium. from France, Palearctic; The same Latreille, after 1804, was considering the ssp. nigrescens Hoffer, 1938, described from name articulata (and then ichneumonides) as the most Moravia and Slovak Republic; representative of the Genus, more than the name formi- ssp. obscura Hoffer, 1938, described from the caria. In fact, in 1809, M. formicaria has been included Slovakian-Ukrainian border; only doubtfully and Jurine (1807) used the incidental Methocha sisala Nagy, 1968, described from the name Mutilla formicaria to refer to the insect described Carpathian Basin (Romania); as Mutilla articulata by Latreille (1792), under
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