Notomicrus petrareptans, Baca & Short, 2018

Baca, Stephen M. & Short, Andrew Edward Z., 2018, Notomicrus petrareptans sp. n., a new seep-dwelling species of Noteridae from Suriname (Coleoptera: Adephaga), Zootaxa 4388 (2), pp. 182-190 : 183-187

Notomicrus petrareptans sp. n.

Type Locality. SUriname, SipaliWini DiStrict (eXtreme SoUtHWeSt), Small inSelberg adjacent to SipaliWini RiVer; 2°10.973’N, 56°47.235’W.

Type Material. HOLOTYPE, ♂, ( NZCS), “ SURINAME: SipaliWini DiStrict / 2°10.973’N, 56°47.235’W, 210 m / Camp 2, on SipaliWini RiVer / SHort & KadoSoe ; Seep on inSelberg/ 1.iX.2010 ; SR10-0901-01A/ 2010 CI-RAP SUrVey” [WHite label, printed type] “ SEMC0916885 / KUNHM-ENT ” [WHite label, printed type WitH barcode] “ HOLOTYPE / Notomicrus petrareptans / Baca and SHort, 2017” [red label, printed type] . PARATYPES (115 exs). Same data as holotype (93 ♂♂ ♀♀); “ SURINAME: Sipaliwini District / 2°10.97’N, 56°47.24’W, 210 m / Camp 2, on SipaliWini RiVer / leg. SHort & KadoSoe ; InSelberg / 29–30.Viii.2010 ; SR10-0829-01A/ 2010 CI-RAP SUrVey” [white label, printed type], “ KUNHM-ENT ” [white barcode labels] (15 ♂♂ ♀♀); “ SURINAME: Sipaliwini DiStrict / 2°21.776’N, 56°47.235’W, 237 m / Camp 3, WeHepai; leg. SHort &/ KadoSoe ; pooled Up detrital creek/ 3.iX.2010 ; SR10-0903-01A; 2010 CI-RAP SUrVey” [WHite label, printed type] “KUNHM-ENT” [WHite barcode labelS] (7 ♂♂♀♀). ParatypeS are depoSited in NZCS (10 ♂♂♀♀) and SEMC (105 ♂♂♀♀).

Diagnosis. Notomicrus petrareptans sp. n. iS eaSily diStingUiSHed from otHer SpecieS by tHe folloWing combination of cHaracterS: (1) elytra not Strongly pUnctate ( Fig. 1 ), anterior Half WitH Sporadic pUnctUreS, more denSe near lateral margin and WitH none to feW Sporadic pUnctUreS betWeen diScal pUnctUre SerieS and elytral SUtUre, poSterior Half more denSely pUnctate, pUnctUreS Weakly to moderately impreSSed; (2) maleS WitH protarSal claWS aS in Fig. 3 , SUbeQUal in lengtH, WitH anterior protarSal claW Very broad, SHarply bent at midlengtH, and WitH Ventral tootH, poSterior claW Slender, cUrVed, not Strongly bent at midlengtH; (3) maleS WitH meSotarSal claWS aS in Fig. 4 , eQUal in lengtH, large, lengtH ca. tWice tHat of protarSal claWS, cUrVed, anterior meSotarSal claW SligHtly broader and SligHtly more Strongly bent tHan poSterior meSotarSal claW at midlengtH; (4) maleS WitH aedeagUS aS in Fig. 5 ; median lobe elongate; diStal Half Very Slender and StraigHt in lateral aSpect, apeX SHarply cUrVed into a Small clUb in dorSal aSpect ( Fig. 5a–c ); left lateral lobe concaVe to median lobe, Scalene in lateral aSpect, dorSal margin Very denSely SetoSe ( Fig. 5d ); rigHt lateral lobe triangUlar ( Fig. 5e ).

Description. Holotype, male. Very Small beetle, TL = 1.44 mm; body oVal-oblong, TL/GW = 2.06, moderately conVeX, greateSt WidtH jUSt anterior to midlengtH, attenUate poSteriorly ( Fig. 1 ), lateral margin of elytra and pronotUm continUoUS in dorSal aSpect.

Color. Head dark broWn dorSally, clypeal region and Ventral SUrface ligHter, broWniSH-yelloW; pronotUm broWniSH-yelloW, anterior and poSterior marginS dark broWn, anterior margin SUbtended by roW of dark broWn SpotS; elytra Uniformly broWn, paler tHan Head, fading to broWniSH-yelloW at apicolateral marginS ( Fig. 1 ). ProSternUm, meSoVentrite, epiSterna, and epimeron broWniSH-yelloW, proSternal proceSS WitH apeX and marginS darkened, broWn; metaVentrite and metacoXae dark reddiSH-broWn, WitH noterid platform SligHtly paler, broWn; firSt ViSible abdominal Ventrite (Ventrite II) broWniSH-yelloW; proceeding VentriteS (III–VIII) SligHtly darkened broWniSH-yelloW, fading to broWniSH-yelloW poSteriorly; lateral SUbmarginS of abdominal VentriteS III–VII darkened to broWn laterally ( Fig. 2 ). Head appendageS and legS broWniSH yelloW WitH Some marginS darkened ( Fig. 2 ).

Head. EyeS of Small to moderate Size relatiVe to Head capSUle, HW/EW = 1.73 ( Fig. 1 ); dorSal SUrface of Head WitH fine microreticUlation conSiSting of tranSVerSely elongate cellS, WitH regUlarly Spaced micropUnctUreS; antennae SHort in lengtH, diStally SUbSerrate, antennomereS V–X eXpanded, antennomereS VI–IX only SligHtly longer tHan Wide, lengtH ca. 1.25X WidtH.

Thorax. PronotUm WitH anterior margin SUbtended by roW of irregUlarly Spaced pUnctUreS, Some pUnctUreS WitH Very fine Setae; lateral marginS WitH Scattered, Weakly impreSSed pUnctUreS WitH Very fine Setae; pronotal diSc WitH fine microreticUlation and regUlarly Spaced micropUnctUreS, microreticUlation conSiSting of Small iSodiametric cellS, cellS longitUdinally oblong laterad of diSc, leSS oblong along poSterior margin. Elytra Weakly pUnctate, nearly impUnctate in anterior Half, WitH diScal SerieS of pUnctUreS Weakly to moderately impreSSed, irregUlarly Spaced, SerieS ceaSing in anterior ¼ of eacH elytron, region betWeen diScal SerieS and elytral SUtUre nearly impUnctate, WitH Sporadic Weakly impreSSed pUnctUreS; poSterior Half of elytra finely pUnctate, moSt pUnctUreS Weakly impreSSed, regUlarly Spaced and increaSingly SetiferoUS approacHing apiceS and lateral marginS; elytral SUrface WitH fine, moderately impreSSed microreticUlation and regUlarly Spaced micropUnctUreS, microreticUlation conSiSting of Small iSodiametric cellS, cellS increaSingly tranSVerSely elongate poSteriorly. ProSternUm and proSternal proceSS WitH fine, Weakly impreSSed microreticUlation and WitH Scattered fine SetiferoUS pUnctUreS medially; noterid platform WitH lateral marginS StraigHt, regUlarly diVergent poSteriorly, WitH poSterior marginS obliQUe, poSterolaterally oriented and broadly roUnded from median to apical lobeS, apical lobeS acUtely roUnded; metaSternUm and noterid platform WitH moderately impreSSed microreticUlation conSiSting of Weakly longitUdinally oblong cellS, oriented obliQUely near SUtUreS. ProtarSi WitH protarSomereS I–III enlarged, eacH bearing 1–2 adHeSiVe diScS; protarSal claWS aS in Fig. 3 , SUbeQUal in lengtH, anterior claW robUSt in lateral aSpect, in anterior aSpect SHarply cUrVed at midlengtH and eXpanded at baSe, forming Ventral tootH ( Fig. 3 ), poSterior protarSal claW Slender, regUlarly cUrVed, not Strongly eXpanded at baSe ( Fig. 3 ); metatarSi WitH meSotarSomereS I–II enlarged, eacH bearing an adHeSiVe diSc; meSotarSal claWS aS in Fig. 4 , eQUal in lengtH, large, lengtH ca. 2X tHat of protarSal claWS, broadly cUrVed, anterior claW in anterior aSpect WitH baSal Half broader and SligHtly more Strongly cUrVed at midlengtH tHan poSterior claW, poSterior meSotarSal claW Strongly cUrVed at baSe ( Fig. 4 ).

Abdomen. Abdominal Ventrite I Hidden Under metacoXae, VentriteS III and IV fUSed, SUtUreS indiStinct, appearing aS a Single large Ventrite, Ventrite VII WitH poSterior margin broadly emarginated, reVealing Ventrite VIII ( Fig. 2 ); SUrface of abdomen WitH moderately impreSSed microreticUlation conSiSting of elongate cellS, cellS more Strongly impreSSed and longitUdinally oriented on VentriteS II-IV bUt becoming obliQUely to tranSVerSally oriented poSteromedially on Ventrite III+IV, cellS tranSVerSally oriented on remaining VentriteS.

Male genitalia. AedeagUS aS in Fig. 5 ; median lobe elongate, cUrVed dorSally from baSe and eXpanded Ventrally, attenUate near Half lengtH, diStal Half Slender and StraigHt in lateral aSpect ( Fig. 5a, c ), rigHt Side WitH SmootH dorSolateral ridge, creating a SomeWHat flattened dorSal SUrface, diStal Half of median lobe broader in dorSal aSpect tHan in lateral aSpect ( Fig. 5a–c ), apeX SHarply cUrVed laterally left in dorSal aSpect ( Fig. 5b ); left lateral lobe concaVe to median lobe, Scalene in lateral aSpect, dorSal margin Very denSely SetoSe Fig. 5d ); rigHt lateral lobe triangUlar ( Fig 5e ).

Measurements. Holotype: TL = 1.44 mm, GW = 0.70 mm, TL/GW = 2.06, HW = 0.44 mm, EW = 0.26 mm, HW/EW = 1.69. ParatypeS (mean and SD in parentHeSeS): TL = 1.34–1.48 mm (1.42 ± 0.03), GW = 0.66–0.74 mm (0.69 ± 0.02), TL/GW = 2.00–2.09 (2.05 ± 0.03), HW = 0.41–0.46 mm (0.44 ± 0.01), EW = 0.24–0.27 mm (0.26 ± 0.01), HW/EW = 1.65–1.73 (1.69 ± 0.02)

Females. Female paratypeS aS maleS in Size and appearance eXcept elytra SligHtly more denSely pUnctate, region betWeen diScal SerieS of pUnctUreS Very tHinly pUnctate in anterior Half, impUntate near baSe; pro- and meSotarSi not eXpanded, WitHoUt adHeSiVe diScS, pro- and meSotarSal claWS reSpectiVely eQUal in lengtH, Unmodified, regUlarly cUrVed, meSotarSal claWS not Significantly longer tHan protarSal claWS; apeX of abdominal Ventrite VII not emarginate, Ventrite VIII Hidden from VieW in Ventral aSpect, SometimeS poSterior margin eXpoSed.

Variation. Notomicrus petrareptans sp. n. iS knoWn from only tWo collecting eVentS aroUnd tHe Same inSelberg, and little Variation WaS obSerVed among SpecimenS. Color Varied SligHtly, WitH Some SpecimenS darker or paler oVerall; abdominal VentriteS Were SometimeS not darkened compared to abdominal Ventrite II, or did not SHoW any darkening of tHe lateral SUbmarginS. Many SpecimenS SHoWed faint, dark longitUdinal StripeS on tHeir elytra, HoWeVer tHiS appearS be to an effect of preSerVation aS tHe StripeS became indiStinct WHen SpecimenS Were relaXed or cleaned WitH Water. SeVeral SpecimenS Were teneral and Very pale in color. THere WaS Some Variation in elytral pUnctation, WitH Some SpecimenS nearly completely impUnctate betWeen tHe diScal SerieS and tHe elytral SUtUre and otHerS SHoWing a feW Scattered pUnctUreS; a Very feW SpecimenS Were obSerVed to HaVe WHat appeared to be a Scattered line of a feW SHalloW pUnctUreS SUbtending tHe elytral SUtUre in tHiS area.

Differential diagnosis. THe combination of tHe Weak pUnctation of tHe elytra ( Fig. 1 ), reSpectiVe SHape and Size of tHe tarSal claWS ( FigS. 3, 4 ) and SHape of tHe median lobe of tHe aedeagUS ( Fig. 5 ) readily diStingUiSH tHiS SpecieS from otHer SpecieS of tHe genUS. Notomicrus petrareptans sp. n. iS moSt Similar to N. gracilipes SHarp, 1882 in HabitUS, Size, and SHape of tHe aedeagUS, HoWeVer N. petrareptans sp. n. iS eXternally diStingUiSHable by tHe Weaker pUnctation, WHerein pUnctUreS are leSS denSe, more SHalloWly impreSSed and nearly completely lacking betWeen diScal SerieS and elytral SUtUre (pUnctation iS coarSer and preSent in tHe area betWeen tHe diScal SerieS and elytral SUtUre in N. gracilipes ), and alSo by tHe cHaracterS of tHe male tarSal claWS ( FigS. 3, 4 ), WitH N. petrareptans sp. n. HaVing tHe meSotarSal claWS mUcH longer tHan tHe protarSal claWS. THe median lobe of tHe aedeagUS of N. petrareptans sp. n. ( Fig. 5 a-c) iS Similar to tHat of N. gracilipes , bUt iS mUcH more elongate and Slender in lateral aSpect in N. petrareptans sp. n., WitH tHe apical clUb Smaller and Hidden in lateral VieW UnleSS VieWed from a dorSally obliQUe angle. In N. gracilipes tHe clUb iS larger, tHoUgH iS Similarly nearly indiStinct in lateral VieW. EXternally, in color and in pattern and StrengtH of pUnctation, N. petrareptans sp. n. may appear Similar to otHer SpecieS SUcH aS N. malkini YoUng, 1978 or N. chailliei ManUel, 2015 , bUt iS eaSily diStingUiSHed by tHe SHape and relatiVe SizeS of tHe tarSal claWS ( FigS. 3, 4 ) and by tHe SHape of aedeagUS ( Fig. 5 ).

Etymology. THe Specific epitapH of N. petrareptans sp. n. iS deriVed from a combination of tHe Greek or Latin petra (noUn, feminine), meaning ‘Stone’ or ‘rock’, and tHe Latin reptans (nominatiVe of tHe Verb repto, neUter), meaning ‘craWler’. It iS treated aS a noUn in tHe nominatiVe SingUlar Standing in appoSition.

Distribution. Notomicrus petrareptans sp. n. iS cUrrently only knoWn from tHe type locality and a neigHboring pooled-Up creek in eXtreme SoUtHWeStern SUriname ( Fig. 6 ). In SHort & KadoSoe (2011), it iS liSted aS Notomicrus Sp. 1.

Habitat. BaSed on oUr collecting effortS, tHiS SpecieS appearS to be Strongly aSSociated WitH Hygropetric Seep HabitatS ( FigS. 7–10 ). It WaS collected togetHer WitH otHer Hygropetric SpecialiStS, inclUding Oocyclus trio SHort & KadoSoe, 2011 ( HydropHilidae ) and SeVeral SpecieS of Fontidessus Miller & Spangler (DytiScidae) . A feW SpecimenS Were alSo foUnd in tHe detrital poolS of a non-floWing creek bed togetHer WitH otHer SpecieS of Notomicrus ( N. traili SHarp, 1882 and N. malkini YoUng, 1978 ) and otHer aQUatic beetleS knoWn from SUcH HabitatS, inclUding memberS of Canthysellus Baca and Toledo (Noteridae) , Anodocheilus Babington , Bidessonotus Régimbart , Copelatus EricHSon, Laccophilus LeacH, Thermonectus Dejean , Vatellus AUbé ( DytiScidae ), Cyloepus EricHSon ( Elmidae ), Anacaena THomSon, Chasmogenus SHarp, Derallus SHarp, Enochrus THomSon, Helochares MUlSant, Hydrobiomorpha BlackbUrn , Phaenonotum SHarp, and Tropisternus Solier ( HydropHilidae ).

Figures

FIGURE 6. Collecting locality of Notomicrus petrareptans sp. n. Map of northern South America with detail of Suriname; pointed star indicates location of N.petrareptans collection sites, includingtype locality.

FIGURES 1–2. Notomicrus petrareptans sp. n.; male paratype.(1) Dorsal habitus.(2) ventral habitus. Scale bar = 0.50 mm.

FIGURES 3–5. Tarsal claws and aedeagus of Notomicrus petrareptans sp. n.; male paratype. (3) Prostarsal claws in anterior aspect; scale bar = 200 µm. (4) Mesotarsal claws in anterior aspect; scale bar = 200 µm. (5) Median and lateral lobes of aedeagus;(a) medianlobe,left lateral aspect; (b) medianlobe, dorsalaspect;(c) medianlobe, rightlateral aspect;(d)leftlateral lobe, right lateral (i.e. medial) aspect; (e) right lateral lobe, left lateral (i.e. medial) aspect;scale bar = 100 µm.

FIGURES 7–10. Habitats of Notomicrus petrareptans sp. n. (7–9) Hygropetric seep on inselberg; type locality, Suriname, Sipaliwini District, near Sipaliwini River, field code SR10-0901-01A. (7) View of rocky outcrop with seep. (8) Seep source, flagging tape for scale. (9) Overhead view of seepage runoff.(10) Close-up of substrate and water film.Photo credits:AEZS.