Lindelöw, Åke
- Department of Ecology, Swedish University of Agricultural Sciences
Abstract
Specimens of the genus Trypophloeus Fairmaire, 1864 collected in Fennoscandia from Salixmyrsinifolia Salisb. and S. glauca L. were studied both morphologically as well as with phylogeneticanalyses based on DNA sequences of the COI and 28S rDNA. Based on the results a new speciesis described and named Trypophloeus borealis sp. n. Scandinavian specimens of this new specieswere previously misidentified as Trypophloeus dejevi Stark, 1936. The phylogenetic and sequencedivergence analyses based on these gene regions show that Trypophloeus nitidus Swaine, 1912, inNorth America is the closest related species. Information on the biology and known distribution isincluded. The new species is a member of the Trypophloeus alni (Lindemann, 1875) species-group.The T. alni species-group is well demarcated and supported by the DNA results. The rest of the speciesin the genus Trypophloeus are proposed to be divided into three other species groups.A classic taxonomic study on the species in the Trypophloeus alni species-group was also carriedout. In general, the morphology of the genus gives a poor basis for taxonomy and morphologicalidentification due to small differences and overlapping characters between the species. Still, thecharacters can give some basis for identification when a large material is examined. However, theoverlap of morphological characters makes the identification uncertain. It should be interpreted as anindication more than an exact identification, even when combined with geographical, biological andhost tree information. The conclusion is that T. borealis sp. n. and T. nitidus are morphologically verysimilar with overlapping characters and are morphological sibling species. Biometric and statisticalstudies might bring more information on morphological differences.The presented study caused some nomenclatorial changes. Trypophloeus niger Stark, 1936 syn.n. is a synonym of Trypophloeus dejevi. The type of Trypophloeus striatulus (Mannerheim, 1853)was considered lost, but has been found in the collection of the Zoological Institute in St. Petersburg,Russia. Many authors erroneously considered the species to belong to the genus Trypophloeus.However, studies of the type show that it actually belongs to the genus Cryphalus Erichson, 1836.Cryphalus striatulus Mannerheim, 1853 has priority, and the name is resurrected and Cryphalusruficollis Hopkins, 1915 syn. n. is thus a new junior synonym. Consequently, Trypophloeus striatulus(Mannerheim, 1853) is not a valid name and Trypophloeus nitidus Swaine, 1912 res. n. is the validname.Information on the biology and known distribution of T. borealis sp. n. is included. Lectotypefor Cryphalus alni Lindemann, 1875 (now called Trypophloeus alni) is selected from Lindemann’sspecimens preserved in Natural History Museum in Vienna and is designated here.
Published in
Norwegian Journal of Entomology
2021, volume: 68, number: 1, pages: 44-66
SLU Authors
UKÄ Subject classification
Forest Science
Zoology
Permanent link to this page (URI)
https://res.slu.se/id/publ/112818