De mieren (Formicidae) van Vlaanderen.
Inleiding
Formicidae : Dolichoderinae : Tapinoma : Tapinoma subboreale
Tapinoma subboreale Seifert
Datum van de beschrijving: 2012
Beschreven door: Seifert, pagina(s) 143-144.
Referentie van de originele beschrijving:
- Seifert, B., 2012. Clarifying naming and identification of the outdoor species of the ant genus Tapinoma FÖRSTER, 1850 (Hymenoptera: Formicidae) in Europe north of the Mediterranean region with description of a new species. - Myrmecological News 16: 139 - 147.
Synoniemen:
Nederlandse naam: heidedraaigatje* * * * *
typebeschrijving
De soort die bij ons werd geïdentificeerd als Tapinoma ambiguum Emery, 1925 werd door Wetterer & al. in 2007 synoniem gesteld aan T. madeirense Forel, 1895. Volgens de herziening van B. Seifert dienen we de als dusdanig geïdentificeerde soort voor wat België betreft te beschouwen als T. subboreale Seifert, 2012.
Etymology. The species epithet is an adjective derived from Latin, meaning "below northern" – referring to the fact that the most northern Scandinavian populations are found south of the boreal zone.
Type material. Holotype male labelled "GER: 51.2294 °N, 11.7329°E, Weischütz-Kirche 1.7 km NE, limestone grassland, 215 m, Seifert 2002.06.14-542", "Holotype Tapinoma subboreale Seifert"; five paratype males and five paratype workers with the same locality label and "Paratype Tapinoma subboreale Seifert" on a separate pin (1 male, 2 workers) and in ethanol (4 males, 3 workers); all material from the same nest sample; five paratype gynes labelled "GER: 50.879°N, 10.840°E, 300 m, Wanderlebener Gleiche, B. Seifert 1984.09.03" and "Paratype Tapinoma subboreale Seifert"; all material in Senckenberg Museum für Naturkunde Görlitz.Description and differential diagnosis. Worker (Tab. 1): All data primary ratios (without RAV correction). Rather small, mean CS 699 μm. Depth of anteromedian clypeal excision 5.2% of cephalic size, much lower than in Tapinoma erraticum or T. nigerrimum but equal to T. madeirense. In general most similar to T. madeirense but the following three characters show statistically significant differences: With maximum cephalic length in visual plane, excavation of hind vertex just notable, being ± 0.43% of CS (in T. madeirense almost zero). Head and mesosoma more elongated than in T. madeirense, CL / CW 1.153, ML / CS 1.362. Using the seven characters, presented in Table 1, there was no clear clustering of workers in a PCA while a DA and LOOCV-DA resulted in error rates of 12.5 and 18.7% in 62 workers (data not shown). The univariate analysis of variance (ANOVA) confirmed as highly significant difference to T. madeirense a smaller CL / CW0.75, ExOcc / CS0.75 and ML / CS0.75 (Tab. 1). For differences to T. erraticum and T. nigerrimum see below and Table 1.
Tab. 1: Absolute cephalic size CS and 11 RAV-corrected shape components of worker individuals of four Tapinoma species. All shape components are corrected for the assumption that all specimens have an equal CS = 0.75 mm. F values and significance levels of a univariate ANOVA are positioned between the species to which they refer. n.s. = nonsignificant.
Gyne (Tab. 2): Rather small, CS 836 - 930 μm. Depth of anteromedian clypeal excision much lower than in Tapinoma erraticum or T. nigerrimum but equal to T. madeirense. In all studied characters most similar to T. madeirense but statistically significant differences are the more elongated head, the larger distance of the inner margins of antennal fossae and the larger eye length (Tab. 2). Using the seven characters presented in Table 2, there was no clear clustering of gynes of T. subboreale sp.n. and T. madeirense in a PCA while a DA and LOOCV-DA resulted in error rates 5.1 and 15.4% in 38 gynes (data not shown). For differences to T. erraticum and T. nigerrimum see below and Table 2.Tab. 2: Absolute cephalic size CS and six shape components of gyne individuals of four Tapinoma species. F values and significance levels of a univariate ANOVA refer to T. ambiguum and T. madeirense. n.s. = nonsignificant.
Male (Fig. 4, Tab. 3): Absolute body size equal to Tapinoma madeirense, ML 1310 - 1630 μm. Anteromedian clypeal incision shallow, clearly wider than deep. With the genital in ventral view and the subgenital plate positioned in visual plane, stipal tips much less surpassing the caudal tips of the subgenital plate than in T. madeirense (dSPST 122 - 172 vs. 252 - 268 μm), the divergence of the caudal tips of the subgenital plate is much larger (SPdT 472 - 563 vs. 370 - 435 μm, compare also Figs. 3 and 4). As a result, the ratio SPdT / dSPST is much larger than in T. madeirense – 3.04 - 4.12 vs. 1.46 - 1.88. Due to extreme elongation and strong divergence of the tips of subgenital plate these are clearly visible also in dorsal aspect of the genital – there is no other Tapinoma species in Europe with a comparable morphology of the subgenital plate.Fig. 4: Ventral aspect of male genital of Tapinoma subboreale sp.n. with plane of subgenital plate in visual plane. Germany: Kosakenberg near Bad Frankenhausen, 26.VI. 1999.
Tab. 3: Morphometric data of Tapinoma subboreale sp.n. and T. madeirense males. The 1st factor of PCA was ex-tracted from the five absolute measurements given in the table in μm. n.s. = nonsignificant.
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