Agraphydrus insidiator Minoshima, Komarek & Ôhara, 2015

Komarek, Albrecht & Hebauer, Franz, 2018, Taxonomic revision of Agraphydrus Régimbart, 1903 I. China and Taiwan (Coleoptera: Hydrophilidae: Acidocerinae), Zootaxa 4452 (1), pp. 1-101 : 44-46

Agraphydrus insidiator Minoshima, Komarek & Ôhara, 2015

(Figs. 28, 75, 106, 148)

Agraphydrus insidiator Minoshima, Komarek & Ôhara 2015: 48 .

Type locality. Taiwan, Taichung City, Heping Distr., Basian Shan National Forest Recreation Area.

Type material examined. Paratypes: TAIWAN: 1 ex. ( NMW): Taipei, Wulai , 9.IX.1993, leg. S.W. Loh ; 7 exs. ( NMW): Basian-shan Nat. Forest Rec. Area, Heping , Taichung; 920 m a.s.l.; wet cement; N24°11.55′, E121°00.83′, 6.VI.2010, leg. Y. Minoshima “L140”.

Additional material examined. TAIWAN: 1 ex. ( NMW): Taipei, Wulai 8.IX.1993, leg. M.L. Jeng ; 2 ƋƋ ( NMW): Taipei, Wulai , 11.IV.1995, leg. L.J. Wang “des . F. Hebauer ”; 1 Ƌ ( NMW): Kao Taoyuan, 23.V.1995, leg. L.J. Wang “des. F. Hebauer ” [all specimens labelled “ Paratype Megagraphydrus politus, M. Hansen ”].

Differential diagnosis. This species belongs to the group of species with nine to ten rows of coarse elytral punctures, together with A. attenuatus , A. politus , A. jaechi , A. regularis , and A. siamensis . It shares eightsegmented antennae, alternating primary and secondary rows of coarse elytral punctures, and reduced metafemoral pubescence with A. politus in contrast to all other species. Aedeagus very similar to aedeagus of A. politus with wide, apically inclining parameres; differs from this species by less numerous and wider spaced serial elytral punctures.

Description. Total length: 2.3̄ 2.9 mm; elytral width: 1.2̄ 1.5 mm; E.I.: 1.3, P.I.: 2.2̄2.3, elytra 3.1̄3.2× as long as pronotum. Habitus broad, almost parallel-sided in midlength, strongly convex dorsally.

Coloration. Labrum, clypeus and frons black, preocular patches absent; maxillary palpi unicolored yellow; pronotum dark rufous brown to black with decreasing intensity of coloration towards yellowish lateral margins; elytra black with very narrow, undefined, yellowish lateral margins, ventrites and legs rufous to black.

Head. Clypeus with distinctly, evenly excised anterior margin; C.I.: 4.1, lateral length ratio clypeus/eyes = 1.8; microsculpture absent; ground punctures very fine, interspaces 2̄4× as wide as punctures; systematic punctures distinct. Eyes moderately large, not protruding, slightly oblong. Antennae with eight antennomeres. Maxillary palpi (Fig. 75) slender, as long as pronotum in midline, 0.9× as long as maximum width of clypeus; length ratio palpomere 4:3 = 1.2, palpomere 4 almost symmetrical. Mentum with very fine punctures, grouped on lateral portions.

Thorax. Pronotal ground punctation as on head; systematic punctures distinct. Elytral ground punctation as on head and on pronotum; very distinct coarse punctures present, arranged in four “primary” rows of very narrowly spaced, regularly distributed punctures with interspaces 1̄2× as large as width of puncture, alternating with four to five “secondary” rows of more irregularly distributed punctures with interspaces 3̄4× as large as width of puncture, lateral series irregular, few large punctures present within narrow spaces between rows. Mesoventrite with distinct mesal bulge, and with very low carina posterior to bulge, M-shaped anteriorly.

Legs (Fig. 106). Pubescence present on more than proximal half of pro- and mesofemur with slightly oblique hairlines, on proximal half of metafemur with straight hairline.

Abdomen. Ventrite 5 with shallow apical emargination.

Aedeagus (Fig. 148). Length: 0.34̄ 0.39 mm. Phallobase as long as parameres, about as long as wide or slightly longer than wide, evenly curving towards distinctly delimited, moderately long manubrium; border between pigmented and unpigmented portion of ventral face reaching basal third in midline. Parameres wide basally; margins distinctly sigmoid; apex asymmetrical, tapering, distinctly bending mesad; base of dorsal face reaching distal third of phallobase; ventral face distinctly shorter than dorsal face. Median lobe wide at base, evenly narrowing towards bluntly rounded apex; corona large, in subapical position; basal apophyses moderately long, inclining laterad, extending to distal third of phallobase.

Ecology. Collected at 920 m a.s.l.; hygropetric on wet rocks.

Distribution. Taiwan.

Agraphydrus jilanzhui sp. n.

(Figs. 29, 107, 149)

Type locality. China, Shaanxi Prov., Qin Ling Shan, 33°55'N 108°49'E.

Type material. Holotype Ƌ (NMW): “China: Shaanxi, Qin Ling Shan \ 108.49 E, 33.55 N, River Valley \ 40 km S Xian, Autoroute km 50 \ River bank, 1200 m \ 31.08.1995, leg. A. Pütz ”. Paratypes: CHINA : Shaanxi: 9 exs. (NMW): same sampling data; Gansu: 2 exs. (NMW): CWBS 325; 1 ex. (NMW): CWBS 326; Hubei: 2 exs. ( NMW): 20 km NW Tongshan , 29.7°N 114.3°E, stream valley, 6. & 19.VI.2002, Jaroslav Turna ; Sichuan: 158 exs. (NMW): CWBS 221; 8 exs. (NMW): CWBS 228; 3 exs. (NMW): CWBS 229; 1 ex. (NMW): CWBS 230.

Differential diagnosis. This species belongs to the group of species with apically infuscated maxillary palpomere 4 and absence of clypeal microsculpture, together with A. coomani , A. comes , A. confusus , A. ishiharai , and A. robustus (see also Remarks under A. coomani ). It differs from these species by dark brown to black elytra. It shares similar aedeagus (with lateral extensions of parameres) with A. ishiharai , differing by length of median lobe (apex not reaching apex of parameres). It shares strong dorsal punctation and lateral extension of parameres with A. robustus , differing by black pronotum with very narrow yellow margins (versus yellow pronotum with narrow, weakly delimited mesal infuscation in A. robustus ).

Description. Total length: 2.3̄ 2.8 mm; elytral width: 1.0̄ 1.3 mm; E.I.: 1.4̄1.5, P.I.: 2.0̄2.1, elytra 3.2̄3.4× as long as pronotum. Habitus slender, almost cylindrical, elytra slightly widening posterior to midlength, weakly to moderately convex dorsally.

Coloration. Labrum black; clypeus black, with very narrow yellow lateral margins, absent in some individuals; frons black; maxillary palpi pale yellowish, palpomere 4 with distinct infuscation in apical third to half; pronotum black with very narrow yellow postero-lateral angles, extending to lateral margins in some individuals; elytra black, with very narrow, very indistinct, yellow lateral margins, with brown posterior area of variable extension in most individuals; ventrites black; legs light brown.

Head. Clypeus with distinctly, evenly excised anterior margin; C.I.: 3.0, lateral length ratio clypeus/eyes = 1.6; microsculpture absent; ground punctures coarse, distinctly impressed, interspaces as wide as puncture; systematic punctures moderately distinct. Eyes large, very slightly protruding, very slightly oblong. Antennae with nine antennomeres. Maxillary palpi slender, 1.1× as long as pronotum in midline, 1.1× as long as maximum width of clypeus; palpomere 4 about 1.2× as long as palpomere 3, palpomere 4 slightly asymmetrical. Mentum with some coarse punctures on lateral portion, without microsculpture.

Thorax. Pronotal ground punctation as on head; systematic punctures distinct. Elytral ground punctation as on head and pronotum, serially arranged on some areas; systematic punctures moderately distinct, arranged in four rows, mesal rows with strongly reduced number of punctures, not reaching anterior margin. Mesoventrite with very weak mesal bulge.

Legs (Fig. 107). Pubescence present on more than proximal half of profemur with oblique hairline, on proximal 2/3 of mesofemur, on proximal 3/4 of metafemur; hairline straight to weakly curved on meso- and metafemur.

Abdomen. Ventrite 5 with shallow apical emargination.

Aedeagus (Fig. 149). Length: 0.46 mm. Phallobase about as long as parameres, longer than wide, evenly curving proximad; manubrium absent or very small, very indistinctly delimited, border between pigmented and unpigmented portion of ventral face reaching basal third in midline. Parameres slender; margins very weakly sigmoid, with slight subapical constriction; apex obliquely flattened, widening, with short, blunt, lateral and mesal projection; basal portion extending to distal third of phallobase. Median lobe narrow, spatulate; apex almost reaching apex of parameres; corona in apical position; basal apophyses moderately long, extending to distal third of phallobase.

Ecology. Collected between 650 and 950 m a.s.l.; in river flowing through secondary forest with large, partly moss-covered rocks; in unpolluted or slightly polluted, cold rivers fast flowing through secondary forests and cultivated land, with pebbles, cobbles, boulders, sand, gravel, and aquatic vegetation.

Distribution. China (Gansu, Hubei, Shaanxi, Sichuan).

Etymology. The species is dedicated to the entomologist Lanzhu Ji (Shenyang, China).