Abstract
On the basis of re-evaluation of morphological characters of the Lycoriella group of genera and subgenera, generic rank is given to the two species groups belonging to Lycoriella (Hemineurina) Frey, 1942 and to Lycoriella (Coelostylina) Tuomikoski, 1960. The Lycoriella (Hemineurina) inflata group, including the type species of the subgenus, Sciara conspicua Winnertz, 1867, is treated as the genus Hemineurina stat. n. and the Lycoriella (Hemineurina) vitticollis group as the genus Trichocoelina gen. n. (type species Sciara vitticollis Holmgren, 1883). Coelostylina Tuomikoski, 1960 (type species Lycoriella (Coelostylina) freyi Tuomikoski, 1960) is a junior homonym of Coelostylina Kittl, 1894, and is renamed Stenacanthella nom. et stat. n. The genera are diagnosed and their phylogeny is discussed. Eight species are excluded from the Lycoriella group. They are transferred to the genera Bradysiopsis Tuomikoski, 1960, Camptochaeta Hippa Vilkamaa, 1994, Merizomma Sasakawa, 2003 stat. n. and Scatopsciara Edwards, 1927 (five species) or are for the time being regarded as incertae sedis (two species) and as nomen nudum (one name). Numerous nomenclatural corrections are made also in the genera Hemineurina Frey, Stenacanthella Vilkamaa Menzel and Trichocoelina Vilkamaa Menzel. Altogether 42 new combinations, three changes in status and one new synonym are presented. A lectotype is designated for Hemineurina algida (Frey, 1948) and two Hemineurina species names are removed from synonymy and given full species status. The following species of Trichocoelina are newly described: Trichocoelina absidata sp. n. (Russia: Krasnodarsk region), T. aemula sp. n. (Finland, Russia: Krasnodarsk region), T. biplex sp. n. (Canada: Newfoundland and Labrador, Yukon), T. dicksoni sp. n. (Russia: Arkhangelsk oblast, Kemerovsk oblast, Krasnodarsk region), T. dispansa sp. n. (Russia: Krasnodarsk region), T. dividua sp. n. (Canada: Northwest Territories), T. hians sp. n. (Canada: Yukon), T. imitator sp. n. (Canada: Yukon), T. incrassata sp. n. (USA: Alaska), T. ithyspina sp. n. (Norway), T. jukkai sp. n. (Finland), T. magnifica sp. n. (Canada: Yukon), T. nefrens sp. n. (Russia: Krasnodarsk region), T. obesula sp. n. (Norway), T. oricillifera sp. n. (Finland, Norway), T. planilobata sp. n. (Finland), T. quintula sp. n. (Finland), T. semisphaera sp. n. (Finland, Norway), T. semusta sp. n. (Italy, USA: Alaska), and T. tecta sp. n. (Canada: Nunavut, Yukon, Russia: Krasnodarsk region, Yamalo-Nenets Autonomous Okrug, USA: Alaska). The Trichocoelina species are keyed, the 20 new species are described and illustrated, and the 9 previously known ones, transferred to the new genus, are briefly diagnosed and the taxonomically relevant literature regarding them is listed. Trichocoelina janetscheki (Lengersdorf, 1953) comb. n. and Trichocoelina brevicubitalis (Lengersdorf, 1926) comb. n. are redescribed. The genus Trichocoelina currently includes 29 species: 17 in the Palaearctic, 6 in the Nearctic and 6 in the Holarctic. All known species are northern or montane.
Highlights
Frey (1942: 36) described the genus Lycoriella with the type speciesSciara vivida Winnertzsensu Frey and introduced 3 subgenera in the same publication: Lycoriella Frey s. str., Hemineurina Frey and Diorychophthalma Frey
The species has a slender, not impressed gonostylus, 2 or 3 elongated and nearly straight setae on its apical half and a slender apical tooth and 2 to 3 strong and nearly straight subapical megasetae. These characters support the view that L. dearmata is closer to the species of Bradysiopsis than to the here proposed genera Hemineurina and Trichocoelina (compare here with, for example, Bradysiopsis vittigera (Zetterstedt, 1851) in Menzel & Mohrig (2000: 189, fig. 159) and Bradysiopsis sordida (Mohrig, 1999) comb. n
The two, very closely placed intergonocoxal lobes of L. dearmata are in no case homologous with with the intergonocoxal lobes of Lycoriella s. str., Hemineurina or Trichocoelina, because at the base they are united with the intergonocoxal area by a strongly sclerotized bridge
Summary
Str., Bradysiopsis Tuomikoski, 1960, Coelostylina Tuomikoski, 1960 and Hemineurina Frey, 1942 This concept of Lycoriella Frey with four re-defined or described subgenera was postulated by Tuomikoski based on morphological characters, not in formal descriptions but in the form of an identification key. In the 1942 paper, Frey included names of 20 described Palaearctic species in his polyphyletic ‘subgenus Hemineurina’ These are currently classified as valid species or junior synonyms in 7 different genera: Bradysia Winnertz, Bradysiopsis Tuomikoski, Camptochaeta Hippa & Vilkamaa, Corynoptera Winnertz, Lycoriella Frey, Scatopsciara Edwards and Schwenckfeldina Frey. Tuomikoski (1960) tranferred this species to the newly established subgenus Bradysiopsis Tuomikoski and added Lycoriella eflagellata Tuomikoski, 1960 to Hemineurina The latter was later transferred in the subgenus Coelostylina Tuomikoski, 1960 by Menzel & Mohrig (2000). Trichocoelina janetscheki (Lengersdorf, 1953) comb. n. is redescribed here in detail, and two highly different species—L. dearmata Mohrig & Krivosheina, 1987 and L. piristylata Vilkamaa, Hippa & Heller, 2013, formerly included in the L. vitticollis group of Hemineurina—are excluded from the new genus
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