Notes on the Scarodytes savinensis-complex with the description of two new taxa (Coleoptera: Dytiscidae) Author Fery, H. Author Šťastný, J. text Linzer biologische Beiträge 2007 2007-12-18 39 2 877 899 journal article 10.5281/zenodo.5416778 0253-116X 5416778 Scarodytes savinensis cercyrae nov.ssp. Hydroporus halensis (FABRICIUS) ; SAHLBERG 1903: 17 . - APFELBECK 1904: 372 (partim). Scarodytes halensis (FABRICIUS) ; FRANCISCOLO 1979: 417 (partim) Scarodytes savinensis (ZIMMERMANN) ; WEWALKA 1977: 141 (partim). - SCHAEFLEIN 1983: 36 . - PEDERZANI 1990: 50 . T y p e l o c a l i t y: Greece , Corfu (Κέρκυρα = Kérkira), ca. 2 km WSW Agheos Mattheos (or Áyios Matthaíos), ca. 39.50N 19.85E {24*}. T y p e m a t e r i a l: H o l o t y p e:, " 15.4.1984 (GR) Corfu, WSW Agheos Mattheos, kleiner Bach/Lache [= small brook/puddle], ca. 50 m , Fery leg.", " Holotype , Scarodytes savinensis cercyrae ssp. n. , Fery & Šťastný det. 2007" [red, printed] {24*} (NMW). P a r a t y p e s: 5, 7, same data as holotype (CHF). 3, 3, " 2.8.1978 (GR) Corfu, WSW Agheos Mattheos, kleiner Bach/Lache, ca. 50 m , Fery leg." (CHF). 1, same data, but " 13.8.1978 " (CHF). 4, 3, " 15.8. 1979 (GR) Corfu, WSW Agheos Mattheos, kleiner Bach/Lache, Dr. E. Pfeiffer leg." (CHF). 1, 6, " 15.4.1984 (GR) Corfu, WSW Agheos Mattheos, gravel brook, Fery leg." (CHF). 7, 5, " 24.3.1985 (GR) Corfu, WSW Agheos Mattheos, kleiner Bach/Lache, ca. 50 m , Fery leg." (CHF). 6, 6, GR. Korfu, E Ag. Georgios, leg Malicky 13.6.[19]77" [ca. 39.60N 19.78E ] {24*} (CGW, CHF). 6, 2, " Greece - Corfu, Dassia, 8.6.- 18.6.2001 , JUDr. L. Daněk lgt." [ca. 39.68N 19.83E ] {24*}, " Scarodytes savinensis Zimm., J. Šťastný det." (CJS). 1, "GR. Korfu (34), NE Kapsochilades, leg. Malicki 24.9.[19]80" [ca. 39.75N 19.73E ] {24*} (CGW). 4, 3, "GR – Korfu, Ermones, Ropa-Fluss, 10.–15.7.[19]88, leg. Wewalka (K1)" [ca. 39.61N 19.78E ] {24*} (CGW). 1, "GR – Korfu, Bach, s. Vouniadates 12.7.[19]88, leg. Wewalka (K3)" [ca. 39.51N 19.87E ] {24*} (CGW). 2, 3, "GR – Korfu, Bach, ö. Kastelliani, 13.7.[19]88, leg. Wewalka (4)" [ca. 39.57N 19.87E ] {24*} (CGW). 1, "Hummler, Corfu" [printed] (MCTR). 1, "Apfelbeck, Corfu" [printed] (CGW). 1, "Corfu, Paganetti" [printed], "12511", " Scarodytes ? savinensis Zimm. , det. Wewalka [19]76" (MNB). 1, "Korfu, 5.10.[19]58, lg. Dr. Boness.", " Scarodytes savinensis , det. H. Schaeflein ", " Scarodytes savinensis Zim , [19]77 det. Angelini F" (CFA). Notes : This is the specimen cited in WEWALKA (1977: 141) and SCHAEFLEIN (1983: 36) as having been found on the roof of a car parked for one hour in the sun on the plain of Rópa (ca. 39.62N 19.80E ) {24*}. All paratypes provided with a red printed paratype label. D i f f e r e n t i a l d i a g n o s i s:Thenewsubspeciesissuperficiallymoresimilar to S. h. halensis than to the nominate subspecies S. s. savinensis and, thus, records of S. h. halensis from Corfu are not surprising ( SAHLBERG 1903 ; APFELBECK 1904 ). It is characterised as follows: • the body shape is more or less the same in both subspecies (see the TL/MW and TLh/MW values in Table 1 ), however, the body size is on average smaller in the new subspecies (by ca. 6%, see Measurements and Table 1 ) and has more or less the same range of the TL as S. h. halensis (according to NILSSON & HOLMEN 1995: 3.8- 4.3 mm ; according to SCHAEFLEIN 1971 : 4.0- 4.5 mm ); • females have a totally reddish abdomen; • the males have the black pronotal spots on average smaller ( Fig. 11 and 12 ) and resembling typical S. h. halensis (compare Fig. 14 ; specimen from Celle, Germany , not far from the town of Halle, from which the species' name is probably derived); only a very few males of the nominate subspecies have these spots as small as those specimens from Corfu with the largest spots; • the females from Corfu have the pronotal spots only indistinctly less extended than the males; in the nominate subspecies, however, most females have spots which are distinctly smaller than in the males, some females even as small as in those from Corfu; • the lateral rim of the pronotum is only slightly broader than in Central European S. h. halensis but narrower than in most specimens of the nominate subspecies (for females compare Figs 1 and 4 in PEDERZANI 1990 ); • the surface punctation is less prominent and the setation sparser and shorter; thus, the specimens appear more shiny, more or less as in typical S. h. halensis ; • the density of the pronotal and elytral punctation is more or less the same in both subspecies; however, in specimens from Corfu, the punctures are distinctly smaller than the distance between them, at least in the anterior half of the elytra; • females from Corfu have the interspaces between punctures smooth, while traces of reticulation are present in the nominate subspecies; • the punctures on the protibia are distinctly smaller in both sexes of the Corfu subspecies. The differences between S. s. cercyrae and S. antoni as well as S. ruffoi are more or less the same as described above for S. s. savinensis . : Median lobe of aedeagus ( Fig. 3 ) smaller than in nominate subspecies, in ventral view slightly narrower, in lateral view more evenly curved; parameres as in Fig. 7; protibiae ( Fig. 20 ) narrower and shorter, outer margin rounded apically as in nominate subspecies. First three protarsomeres less broadened, fifth one appearing longer than in nominate subspecies, mainly since third tarsomere shorter and covering less of fifth (Fig. 24); anterior claws (Fig. 27) more curved, thinner and shorter though rather variable in length, generally longer than in S. h. halensis . Mesotarsomeres at most indistinctly broadened, claws simple as in females. : Protibia narrower than in males ( Fig. 21 ). Protarsomeres and protarsal claws not modified. Gonocoxosternum and gonocoxa more or less like those of S. antoni (compare Figs 15 and 16). M e a s u r e m e n t s: TL: 3.85-4.6 mm , MW: 2.05-2.3 mm , TL/MW: 1.88-2.02. More detailed data and a comparison with specimens of the nominate subspecies are given in Table 1. D i s t r i b u t i o n: Greece , endemic to the island of Corfu (Fig. 29). N o t e s: We decided conservatively to describe the Corfu population as a subspecies and not as a proper species. The study of possible mainland populations in the region of north-western Greece and Albania as well as molecular studies may prompt a change of the taxon's rank in the future. E c o l o g y: The specimens collected near Agheos Mattheos have been found in two different brooks, one of them very small with slowly running water, the other one broad but flat, faster-running, and with the ground totally covered with gravel. In the small brook the specimens were collected together with Agabus dilatatus (BRULLÉ 1832) , Bidessus delicatulus (SCHAUM 1844) , D. moestus inconspectus , Graptodytes fractus (SHARP 1882) , Hydroporus jonicus L. MILLER 1862 , L. hyalinus , and Melanodytes pustulatus (ROSSI 1792) . In the broad brook S. s. cercyrae was found together with D. moestus inconspectus and G. fractus . D e r i v a t i o n o m i n i s: The name of the new subspecies is a noun in the genitive case, derived from Cercyra (in Greece : Κέρκυρα or Κóρκυρα), a river nymph of the Greece mythology after which the island Kérkira (= Corfu in English) has been named.