via Monte Corno 12/1, 16166 Genoa, Italy .
Zootaxa. 2021 Jun 17;4987(1):1-131. doi: 10.11646/zootaxa.4987.1.1.
A taxonomic revision and a key to the Chthonius C.L. Koch, 1843 species of the ischnocheles group from Italy, with records from neighbouring countries, are provided. The following new species are described: Chthonius gallettii n. sp. (♂, locus typicus: Sicily, Ragusa Province, Ragusa, Grotta delle Lame 6009 Si/RG), Chthonius gentianae n. sp. (♂, Veneto, Treviso Province, Fregona, Pian del Cansiglio, Bus della Genziana 1000 V/TV), Chthonius herminii n. sp. (♂♀, Veneto, Treviso Province, Cavaso del Tomba, Costalunga, Speoncia del Diaol 1811 V/TV); Chthonius inguscioi n. sp. (♂♀, Apulia, Lecce Province, Presicce, Grotta Madonna della Rutta 533 Pu/LE), Chthonius lanai n. sp. (♂♀, Piedmont, Cuneo Province, Bernezzo, Pertus d'la Kassetta 1323 Pi/CN), Chthonius marciai n. sp. (♂, Sardinia, Nuoro Province, Dorgali, Grotta del Bue Marino 12 Sa/NU) and Chthonius nicolosii n. sp. (♂♀, Sicily, Catania Province, Nicolosi, Grotta Lunga 1029 Si/CT). The following new subjective synonymies are proposed: Chthonius malatestai Callaini, 1980 n. syn. of C. agazzii Beier, 1966; Chthonius ruffoi Caporiacco, 1951 n. syn. of C. densedentatus Beier, 1938; Chthonius mingazzinii Callaini, 1991 n. syn. of C. euganeus Gardini, 1991; Obisium megachelum Amary, 1840 n. syn. of C. ischnocheles (Hermann, 1804); Chthonius dalmatinus Hadži, 1930 n. syn. of C. ischnocheles (Hermann, 1804); Chthonius litoralis Hadži, 1933 n. syn. of C. ischnocheles (Hermann, 1804); Chthonius rhodochelatus Hadži, 1937 of C. ischnocheles (Hermann, 1804) (rest. syn.). Chthonius horridus Beier, 1934 (n. stat.) is upgraded from subspecies of C. doderoi Beier, 1930 and Chthonius reductus Beier, 1939 (n. stat.) from subspecies of C. ischnocheles (Hermann, 1804). A lectotype is designated for Chthonius rayi L. Koch, 1873. Twenty-eight species of Chthonius of the ischnocheles group are known at present from Italy, of which three are endemic to Sicily and two to Sardinia. New country records are established for Chthonius alpicola Beier, 1951 (Croatia and Slovenia); Chthonius guglielmii Callaini, 1986 (mainland France), Chthonius halberti Kew, 1916 and Chthonius ilvensis Beier, 1963 (Corsica); Chthonius pygmaeus Beier, 1934 (Switzerland), and Chthonius densedentatus Beier, 1938 (France, Italy, Switzerland, Slovenia, Croatia, Albania and Greece).
提供了意大利伊什奇内尔斯组的 Chthonius C.L. Koch, 1843 种的分类修订和关键，包括来自邻国的记录。以下是新描述的物种：Chthonius gallettii n. sp.（♂，模式产地：西西里岛，拉古萨省，拉古萨，拉梅 6009 号洞穴/ RG），Chthonius gentianae n. sp.（♂，威尼托大区，特雷维索省，弗雷戈纳，皮亚琴察冰川，比安科迪琴扎 1000 号 V/TV），Chthonius herminii n. sp.（♂♀，威尼托大区，特雷维索省，卡瓦索德尔托马巴，科斯塔伦加，斯佩奥尼娅迪迪奥拉 1811 号 V/TV）；Chthonius inguscioi n. sp.（♂♀，普利亚大区，莱切省，普雷西切，拉马多拉鲁塔洞 533 号 Pu/LE），Chthonius lanai n. sp.（♂♀，皮埃蒙特大区，库内奥省，贝内佐，珀图斯加塞塔 1323 号 Pi/CN），Chthonius marciai n. sp.（♂，撒丁岛，努奥罗省，多拉里，海洋之马洞 12 号 Sa/NU）和 Chthonius nicolosii n. sp.（♂♀，西西里岛，卡塔尼亚省，尼科洛西，朗加洞 1029 号 Si/CT）。提出了以下新的主观同物异名：Chthonius malatestai Callaini, 1980 n. syn. of C. agazzii Beier, 1966；Chthonius ruffoi Caporiacco, 1951 n. syn. of C. densedentatus Beier, 1938；Chthonius mingazzinii Callaini, 1991 n. syn. of C. euganeus Gardini, 1991；Obisium megachelum Amary, 1840 n. syn. of C. ischnocheles (Hermann, 1804)；Chthonius dalmatinus Hadži, 1930 n. syn. of C. ischnocheles (Hermann, 1804)；Chthonius litoralis Hadži, 1933 n. syn. of C. ischnocheles (Hermann, 1804)；Chthonius rhodochelatus Hadži, 1937 n. syn. of C. ischnocheles (Hermann, 1804) (rest. syn.)。Chthonius horridus Beier, 1934 (n. stat.) 由 C. doderoi Beier, 1930 的亚种升级，Chthonius reductus Beier, 1939 (n. stat.) 由 C. ischnocheles (Hermann, 1804) 的亚种升级。Chthonius rayi L. Koch, 1873 的模式标本被指定为正模。目前已知意大利有 28 种伊什奇内尔斯组的 Chthonius，其中 3 种是西西里岛特有种，2 种是撒丁岛特有种。建立了 Chthonius alpicola Beier, 1951（克罗地亚和斯洛文尼亚）、Chthonius guglielmii Callaini, 1986（法国本土）、Chthonius halberti Kew, 1916 和 Chthonius ilvensis Beier, 1963（科西嘉岛）、Chthonius pygmaeus Beier, 1934（瑞士）和 Chthonius densedentatus Beier, 1938（法国、意大利、瑞士、斯洛文尼亚、克罗地亚、阿尔巴尼亚和希腊）的新国家记录。
