Eridaulus Thomson, 1859

Jelínek, Josef, 2007, Nomenclatural changes in the family Ciidae (Coleoptera), Acta Entomologica Musei Nationalis Pragae 47, pp. 135-141 : 136-137

1. Eridaulus Thomson, 1859 , and Eridaulus Thomson, 1863

Problem of the genus-group name Eridaulus was commented on by LOHSE (1964) and LAWRENCE (1965). LOHSE (1964) pointed out that Cis comptus Gyllenhal, 1827 , was the type species of Eridaulus and that the name Eridaulus was later misinterpreted and used as the name for the group of species related to Cis nitidus , to which Cis comptus does not belong. On the contrary, LAWRENCE (1965: 280) summarized his opinion in the following two points: (i) The genus Eridaulus Thomson, 1863 , originally included two species: Anobium nitidum Fabricius, 1792 , and Cis jacquemarti Mellié, 1849 . (ii) The only worker to designate a type for Eridaulus was ABEILLE DE PERRIN (1874), who selected Cis comptus Gyllenhal, 1827 . This species, however, was not originally included in the genus, and is therefore unavailable as a type. In the same work, ABEILLE DE PERRIN (1874) designated Cis nitidus as the type species of Entypus Redtenbacher. 1847 , making a similar error. Later, LAWRENCE (1971) designated Anobium nitidum Fabricius, 1792 [in fact Kateretes castaneus Herbst, 1793 misidentified as Anobium nitidum Fabricius, 1792 , see below] as the type species of Eridaulus Thomson, 1863 .

However, LAWRENCE (1965) overlooked the fact that Thomson himself designated the type species of his new genera in the first volume of his Skandinaviens Coleoptera ( THOMSON 1859) . Thus his new genus-group names are available by indication ( ICZN 1999, Article 12.2.5) with the date 1859, even though the formal descriptions of relevant genera appeared later in subsequent volumes of the book. In the first volume THOMSON (1859: 91) designated Cis comptus Gyllenhal, 1827 , as the type species of Eridaulus (original designation) and Cis nitidus as the type species of Entypus Redtenbacher, 1847 (subsequent designation). ABEILLE DE PERRIN (1874) and LOHSE (1964) thus only accepted the previous designations by THOMSON (1859), which remained neglected by most subsequent authors. Whereas the designation of Cis nitidus as the type species of Entypus is indeed erroneous because the species was not originally included in Entypus by REDTENBACHER (1847), Cis comptus is perfectly valid as the type species of Eridaulus Thomson, 1859 , a junior subjective synonym of Cis Latreille, 1796 (type species Dermestes boleti Scopoli, 1763 ). Eridaulus Thomson, 1863 , containing Cis nitidus and Cis jacquemarti , can be understood as a misinterpretation of Eridaulus Thomson, 1859 , and the subsequent designation of Cis nitidus as its type species by LAWRENCE (1971) is invalid.

Species related to Cis nitidus auct. (non Fabricius, 1792) (see below) and corresponding to Eridaulus sensu THOMSON (1863) are morphologically distinct from other species of Cis Latreille, 1796 (type species Dermestes boleti Scopoli, 1763 ), and seem to represent a monophyletic group which was given a rank varying between genus and species-group by various authors. THOMSON (1863) decribed it as a distinct genus but it was more frequently classified as a subgenus of Cis , e.g. by KIESENWETTER (1898), SCHILSKY (1900), REITTER (1901) and ABDULLAH (1973). LAWRENCE (1965) argued in favour of its generic rank but later ( LAWRENCE 1971) reduced it to the Cis nitidus species-group. This concept was accepted e.g. by LOHSE (1965), KAWANABE (1997) and ORLEDGE & BOOTH (2006). Nevertheless, LOHSE & LUCHT (1992) again proposed subgenus rank for it. However, when this group is treated as a genus- group taxon, Eridaulus is not available as its name for reasons mentioned above. Thus the oldest available name for it is Xestocis Casey, 1898 (= Eridaulus sensu Thomson, 1863 , non Eridaulus Thomson, 1859 ). The synonymy of Eridaulus sensu Thomson, 1863 and Xestocis was established by LAWRENCE (1965: 280-281).

The resulting taxonomic changes should be summarised as follows: