Hydroporus macedonicus, Fery & Pesic, 2006

Fery, H. & Pesic, V., 2006, Hydroporus macedonicus nov. spec., a new member of the Hydroporus planus-group (Coleoptera, Dytiscidae), Linzer biologische Beiträge 38 (1), pp. 595-604 : 596-598

Hydroporus macedonicus nov. spec.

T y p e l o c a l i t y: Republic of Macedonia, Kožuf mountains, Dve Uši, near the village of Konopište.

H o l o t y p e:, " 20.7.2004 Macedonia, Kožuf Mt. , Dve Uši, rheohelocrenic spring, ca. 2 km from Konopište, Pesic leg. (Mac1)" [printed], " Holotype, Hydroporus macedonicus sp. n., Fery & Pesic det. 2005" [red, printed], "ref. No. MNCN-AI251, GeneBank accession numbers COI: DQ195528 , 16S: DQ195529 " [printed] ( NMW).

P a r a t y p e:1, first label as in the holotype, and a respective red paralectotype label (CHF).

N o t e s: For the description of rheohelocrenic springs see e.g. GERECKE (1996: 474).

Diagnosis: Habitus short oval, with a rather stout appearance ( Fig. 1 ); surface somewhat depressed, considerably flatter than in H. discretus from central Europe which has a distinctly convex surface; discontinuity between sides of pronotum and those of elytra very weak, thus lateral outline almost continuous in dorsal view; in dorsal view sides of elytra in anterior third almost straight, and slightly diverging, rounded behind; widest shortly before end of anterior half of elytra. Upper and ventral surface black to a large extent; head with reddish brown areas, pronotum with sides dark brownish, elytron near base and on apex shining through brownish.

Head behind anterior clypeal margin and a narrow transverse fasciae on vertex reddish brown. Surface entirely microreticulated, punctate on clypeus, punctation becoming coarser on frons, absent on vertex. Between eyes and anterior clypeal margin with two large, but flat clypeal impressions, here punctation finer and denser.

Pronotum with sides almost straight and diverging backwards in posterior three quarters, curved anteriorly, posterior angles very shortly rounded. Lateral beadings distinct, approximately as broad as half diameter of antennal articles. Beadings and anterior angles dark brownish; anterior and posterior margins narrowly and indistinctly dark brown; rest of pronotum black. Surface microreticulated to large extent, between centre of disc and posterior margin shiny on a small area. Punctation dense on disc, still denser and coarser near sides and anterior and posterior margins. Whole surface covered with fine colourless setae (<0.1 mm).

Elytra black, basally and in particular near shoulders as well as on apex, brownish with colour shining through, transitions between brown and black areas poorly delimited; surface largely smooth and shiny, reticulated only immediately before apex; entirely covered with setae like on pronotum. Punctation simple, dense and coarse, distance between punctures more or less equals their diameter; two noticeable puncture lines on each elytron; sutural puncture lines absent; apex provided with a few very coarse punctures. In lateral view epipleural rim very weakly ascending towards humeral angle. Epipleura in lateral view not visible to shoulder (compare Figs. 180–182 in NILSSON & HOLMEN 1995).

Ventral surface to a large extent black; mouth parts reddish brown, sides of prosternum, pro- and mesocoxae, metacoxal processes and prosternal process between and behind procoxae dark brown in part; hind margins of last abdominal segments with brownish colour shining through. Gula very indistinctly more brownish than almost black genae; gula smooth, genae distinctly microreticulated. Legs and antennae reddish brown. Antennal articles slightly darkened distally beginning with fifth; third and fourth articles smaller, second and fourth to tenth articles bigger, but not much longer than wide. Protibiae with two rows of setiferous punctures on anterior face; middle of meta- and mesofemora provided with one row of punctures. Prosternal process with a ridge between procoxae, before flat, not prolonged towards base of prosternum as a narrow convexity, provided with a few transverse subbasal grooves. Blade of process lanceolate, carinate, apex shortly rounded; sides provided with a rim and some setae. Metacoxal plates, sides of metasternum, and first two abdominal segments with very coarse punctation; centre of metasternum, next to a slightly impressed midline, with finer punctures. Punctation on third to fifth visible abdominal segments less coarse; apex of last segment with punctures denser and coarser, between punctures distinctly microreticulated; fifth segment weakly reticulated, rest of venter smooth. Setae present on entire venter, similar to that of upper surface. Epipleura provided with a puncture line next to inner margin; resting surface with flat and very broad indistinct punctations. Metacoxal lines diverging forwards, not reaching hind margin of metasternum ( Fig. 2 ); next to each line with a deeply impressed puncture line; interlinear space provided with a few strongly elongated punctures; setae present, but not conspicuous. Metacoxal processes with posterior margin not exactly conjointly truncate, hind margins of both almost straight, but forming an oblique angle ( Fig. 2 ).

: Median lobe in ventral and lateral view as in Fig. 3 ; paramere as in Fig. 4 . First three protarsomeres distinctly broader than those of mesotarsi; protarsal claws equal, simple, evenly curved, distinctly shorter than fifth protarsomere which is shorter than second and third together; mesotarsal claws similar to those of protarsi, but longer; fifth mesotarsomere as long as second and third together.

: Not found.

Measurements: TL: holotype: 3.05 mm, paratype: 2.9 mm; MW: holotype: 1.7 mm, paratype: 1.65 mm. The ratio TL/MW can be seen as a measure of the stoutness of the body. It has the values 1.79 and 1.76 respectively for the two specimens studied, and is thus distinctly smaller than in H. discretus which has a more elongate oval appearance (see below).

Distribution: Southern part of the Republic of Macedonia; near the border to Greece, Kožuf mountains, Dve Uši, near the village of Konopište; so far known only from the locus typicus.

Figures

Figs. 1-4: Hydroporus macedonicus sp.n.: (1) habitus; the dotted lines indicate the areas with brownish coloration; (2) metacoxal processes (schematic); (3) median lobe of aedeagus in ventral and lateral view; (4) paramere.