Most species of the Colletes succinctus group sensu Noskiewicz, 1936 are taxonomically uncertain. This study has chosen an integrative approach, including pollen analysis, morphology, male genitalia, morphometry, cuticle sculpture and DNA-barcoding (CO1) to investigate the five species that were reported from Austria. It includes a detailed analysis of the male genitalia and the first description of the C. pannonicus male. A syntype male from the island of Crete was designated as the lectotype of Colletes succinctus brevigena Noskiewicz, 1936 to fix the species identity. New distinguishing characters were found: in females the shape of the dorsal end of the fovea facialis and, in both sexes, the structure of maxillary palpi, as well as the different puncturation on the mesopleura. Unknown structures on sterna and genitalia of the males proved to be reliable morphological characters. An identification key is provided for all studied species. Morphometry of females did not allow a clear distinction of species. CO1 sequencing confirmed previous studies that only C. collaris clearly deviates from the other species, including C. pannonicus that was analysed for the first time. Pollen analysis showed polylectic, as well as oligolectic, pollen-collecting behaviour. The collected pollen of C. pannonicus confirmed the field observations that this species is strictly oligolectic on Tripolium pannonicum. Due to pronounced intraspecific variation, it is assumed that the species of the C. succinctus group are either species in statu nascendi or very young species. Therefore, it remains important to include ecological data in species identification.

中文翻译：

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Colletes succinctus组（膜翅目，Ap科）中五个奥地利种的形态，花粉偏爱和DNA条形码

Colletes succinctus群体sensu Noskiewicz，1936年的大多数物种在分类学上都是不确定的。这项研究选择了一种综合方法，包括花粉分析，形态，雄性生殖器，形态，表皮雕塑和DNA条形码（CO1），以调查奥地利报告的这5个物种。它包括对男性生殖器的详细分析和对C. pannonicus男性的首次描述。1936年，来自克里特岛的同型雄性被指定为Colletes succinctus brevigena Noskiewicz的选型，以固定物种身份。发现了新的区别特征：在女性中，中央凹中央凹的背侧形状，以及在男女中，上颌骨睑的结构以及中胸膜的不同穿刺。男性的胸骨和生殖器的未知结构被证明是可靠的形态特征。提供了所有研究物种的识别码。雌性的形态没有明确区分物种。CO1测序证实了以前的研究，即只有衣领衣藻明显偏离其他物种，包括首次分析的绒毛衣藻。花粉分析显示出多电性和寡电性的花粉收集行为。采集到的C. pannonicus花粉证实了实地观察，表明该种在Tripolium pannonicum上是严格寡聚的。由于明显的种内变异，可以假定丁香梭菌组的物种要么是成年状态的物种，要么是非常年轻的物种。因此，