TL;DR: It is revealed that C. mediterraneus and Carpocoris fuscispinus form two reciprocally monophyletic genetic lineages, which are supported by geographical distribution patterns in Western Europe and by sequencing of the mitochondrial Cytochrome c oxidase I standard barcode fragment.
Abstract: Carpocoris mediterraneus Tamanini, 1958, synonymized with Carpocoris fuscispinus (Boheman, 1851) by Ribes et al. (2007), is restored to the species level. The shape of the pronotum is a good diagnostic character to distinguish the two species. The existence of two valid species is supported by geographical distribution patterns in Western Europe: Mediterranean-Atlantic for C. mediterraneus, and Continental for C. fuscispinus. In France and Spain, in some areas, the two species are found in sympatry (sometimes even on the same plant). Morphological observations are confirmed at the molecular level by sequencing of the mitochondrial Cytochrome c oxidase I standard barcode fragment. Indeed, inter-specific divergence largely exceeded intra-specific divergence and our phylogenetic reconstructions reveal that Carpocoris mediterraneus and Carpocoris fuscispinus form two reciprocally monophyletic genetic lineages. A morphological identification key is proposed for all the European species of the genus Carpocoris, to facilitate identification. Carpocoris fuscispinus is first time recorded from Portugal.
TL;DR: Smell glands of Carpocoris fuscispinus have many features in common: a large, median reservoir and paired lateral glands opening laterally at each anterior margin forming evaporation areas composed of mushroom-like structures, which are diagnostic for species-level taxonomy.
Abstract: Metathoracic scent glands (MTGs) of Carpocoris fuscispinus (Boheman, 1851) (Heteroptera: Pentatomidae) were studied in adult females and males. Structures of the glands were investigated using scanning electron microscopy, and the volatile fraction was analyzed by gas chromatography-mass spectrometry. MTGs of C. fuscispinus have many features in common: a large, median reservoir and paired lateral glands opening laterally at each anterior margin forming evaporation areas composed of mushroom-like structures, which are diagnostic for species-level taxonomy. In the MTGs of C. fuscispinus, 24 and 21 compounds were detected in females and males, respectively. Most of the chemical compounds are qualitatively similar in each male and female but differ in quantity. In the MTG analysis of females, n-tridecane (57.76%) was most abundant, and bromoacetic acid decyl ester (0.04%) was least abundant. In males, n-tridecane (49.26%) was most abundant, and 2,3-dihydroxypropyl ester (0.06%) was least abundant in all samples.
TL;DR: Among the two Pentatomidae insects, C. fuscispinus much prefer feeding and oviposition on all four plant species than D. baccarum.
Abstract: Background. The plants from the Brassicaceae family are the basic food product practically all over the world. In the growing season these plants can be attacked by insects. We studied the response of two phytophagous species from the family Pentatomidae to little-known but interesting plants from the family Brassicaceae. Material and methods. In laboratory conditions, the effect of the total content of phenolic compounds (Folin-Ciocalteau colorimetric method) in a few plants from the family Brassicaceae (Thlaspi arvense L., Descurainia sophia (L.) Webb ex Prantl, Berteroa incana (L.) D.C. and Diplotaxis tenuifolia (L.) D.C.) on the feeding and development parameters of two herbivores from the family Pentatomidae (Hemiptera): Dolycoris baccarum L. and Carpocoris fuscispinus (Boh.) was studied. Results. From among the above four plant species, B. incana contain the highest total amounts of phenolic compounds of 1.87% DM. D. baccarum much prefer feeding on D. sophia (53.3%) and the other one (C. fuscispinus ) on T. arvense. The eggs need on average 11 days for embryonal phase of development. There is a strong correlation between the total content of phenolic compounds and the total pricks of plant tissues for D. baccarum (r = -0.7812) and for C. fuscispinus eggs hatching (r = 0.9299). Conclusion. Among the two Pentatomidae insects, C. fuscispinus much prefer feeding and oviposition on all four plant species than D. baccarum.