@article {1807,
	title = {Taxonomic Synopsis of the Ponto-Mediterranean Ants of Temnothorax nylanderi Species-Group},
	journal = {PLoS ONE},
	volume = {10},
	year = {2015},
	abstract = {<p>In the current revisionary work, the Temnothorax nylanderi species-group of myrmicine ants is characterized. Eighteen species belonging to this group in the Ponto-Mediterranean region are described or redefined based on an integrative approach that combines exploratory analyses of morphometric data and of a 658bp fragment of the mitochondrial gene for the cytochrome c oxidase subunit I (CO I). The species group is subdivided into five species complexes: T. angustifrons complex, T. lichtensteini complex, T. nylanderi complex, T. parvulus complex, T. sordidulus complex, and two species, T. angulinodis sp. n. and T. flavicornis (Emery, 1870) form their own lineages. We describe seven new species (T. angulinodis sp. n., T. angustifrons sp. n., T. ariadnae sp. n., T. helenae sp. n., T. lucidus sp. n., T. similis sp. n., T. subtilis sp. n.), raise T. tergestinus (FINZI, 1928) stat.n. to species level, and propose a new junior synonymy for T. saxonicus (SEIFERT, 1995) syn.n. (junior synonym of T. tergestinus). We describe the worker caste and provide high quality images and distributional maps for all eighteen species. Furthermore, we provide a decision tree as an alternative identification key that visually gives an overview of this species-group. We make the first application to Formicidae of the Semantic Phenotype approach that has been used in previous taxonomic revisions.</p>
},
	doi = {doi:10.1371/journal.pone.0140000},
	author = {Cs{\H o}sz, S{\'a}ndor and Heinze, J{\"u}rgen and Mik{\'o},Istv{\'a}n}
}
@article {1805,
	title = {Temnothorax crasecundus sp. n. {\textendash} a cryptic Eurocaucasian ant species (Hymenoptera, Formicidae) discovered by Nest Centroid Clustering},
	journal = {ZooKeys},
	volume = {479},
	year = {2015},
	pages = {37-64},
	abstract = {<p>The paper integrates two independent studies of numeric morphology-based alpha-taxonomy of the cryptic ant species Temnothorax crassispinus (Karavajev, 1926) and T. crasecundus sp. n. conducted by different investigators, using different equipment, considering different character combinations and evaluating different samples. Samples investigated included 603 individual workers from 203 nests \&ndash; thereof 104 nest samples measured by Seifert and 99 by Cs\&ouml;sz. The material originated from Europe, Asia Minor and Caucasia. There was a very strong interspecific overlap in any of the 29 shape characters recorded and subjective expert determination failed in many cases. Primary classification hypotheses were formed by the exploratory data analysis Nest Centroid (NC) clustering and corrected to final species hypotheses by an iterative linear discriminant analysis algorithm. The evaluation of Seifert\&rsquo;s and Cs\&ouml;sz\&rsquo;s data sets arrived at fully congruent conclusions. NC-Ward and NC-K-means clustering disagreed from the final species hypothesis in only 1.9 and 1.9\% of the samples in Seifert\&rsquo;s data set and by 1.1 and 2.1\% in Cs\&ouml;sz\&rsquo;s data set which is a strong argument for heterospecificity. The type series of T. crassispinus and T. crasecundus sp. n. were allocated to different clusters with p = 0.9851 and p = 0.9912 respectively. The type series of the junior synonym T. slavonicus (Seifert, 1995) was allocated to the T. crassispinus cluster with p = 0.9927. T. crasecundus sp. n. and T. crassispinus are parapatric species with a long contact zone stretching from the Peloponnisos peninsula across Bulgaria northeast to the southern Ukraine. There is no indication for occurrence of interspecifically mixed nests or intraspecific polymorphism. However, a significant reduction of interspecific morphological distance at sites with syntopic occurrence of both species indicates local hybridization. The results are discussed within the context of the Pragmatic Species Concept of Seifert (2014). The taxonomic description and a differential diagnosis of T. crasecundus sp. n. are given.</p>
},
	keywords = {hybridization, intraspecific dimorphism, Numeric morphology-based alpha-taxonomy, parapatric species, Pragmatic Species Concept},
	doi = {10.3897/zookeys.479.8510},
	author = {Seifert, Bernhard and Cs{\H o}sz, S{\'a}ndor}
}
