Heteropriapulus falxus, Acosta, Aline Angelina, Franceschini, Lidiane, Zago, Aline Cristina, Scholz, Tomáš & Silva, Reinaldo José Da, 2017

Acosta, Aline Angelina, Franceschini, Lidiane, Zago, Aline Cristina, Scholz, Tomáš & Silva, Reinaldo José Da, 2017, Six new species of Heteropriapulus (Monogenea: Dactylogyridae) from South American fishes with an amended diagnosis to the genus, Zootaxa 4290 (3), pp. 459-482 : 471-472

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Heteropriapulus falxus

n. sp.

Heteropriapulus falxus n. sp.

urn:lSid:zOObank.Org:act:27473050-57DC-40A0-AA3A-107485 AFFE 4F ( Fig. 6 View FIGURE 6 )

Type host. Hypostomus strigaticeps (Regan) ( SilurifOrmeS : LOricariidae ).

Additional host. Hypostomus ancistroides (Ihering) ( SilurifOrmeS : LOricariidae ).

Site of infection. GillS.

Type locality. Sapucaí-Mirim RiVer (Paraná RiVer baSin), municipality Of SãO JOaquim da Barra , SãO PaulO State , Brazil (20°29'38,38"S, 47°51'33.11"W) GoogleMaps .

Type specimens. HOlOtype (CHIOC 38815) 1 paratype (CHIOC 38816); 3 paratypeS in CHIBB (303–305L).

Etymology. The Specific name in frOm Latin (falx = Sickle) and referS tO the mOrphOlOgy Of the acceSSOry piece.

Description. BaSed On 5 SpecimenS mOunted in HOyer’S and Grey and WeSS medium. BOdy 224–322 (265; n=4) lOng, greateSt Width 45–65 (57; n=4), uSually near mid-length. AcceSSOry granuleS eXtending frOm leVel Of gOnadS tO cephalic lObeS. Male cOpulatOry cOmpleX cOmpriSing nOn-articulated cirruS and acceSSOry piece. CirruS delicate, tOtal curVed length 31–34 (33; n=3), Straight in anteriOr pOrtiOn, preSenting 1½ cOunterclOckWiSe Spiral ringS neXt tO rOunded baSe. AcceSSOry piece 26–30 (28; n=4) lOng, cOmpOSed Of 2 StrOngly SclerOtized SubunitS OVerlapping: One Small and bent, and anOther lOnger, rObuSt, cOnSpicuOuS, Shaped aS a ‘fOrk’ With One lateral rami; tWO SubunitS tOgether preSent Shape reSembling a ‘Sickle’ ( Fig. 6 View FIGURE 6 D). Vaginal canal incOnSpicuOuS, Weakly SclerOtized and Straight. HaptOr 36 (32–42; n=4) lOng, 65 (59–71; n=4) Wide, SubtrapezOidal. Ventral anchOrS 16– 19 (18; n=5) lOng, length tO nOtch 22–26 (24; n=5), flattened baSe 8–10 (9; n=5) Wide, elOngate Shaft, pOint 13–22 (20; n=5) lOng With recurVed tip, pOintS eXtending pOSterOVentrally frOm haptOr; anchOr filament dOuble, mOderately deVelOped; Small and delicate SclerOtized patch aSSOciated With baSe Of Ventral anchOr preSent. DOrSal anchOrS 21–26 (23; n=4) lOng, length tO nOtch 17–20 (18; n=4), elOngate and narrOW Superficial rOOt, 7–9 (8; n=4) lOng, ShOrt deep rOOt 5–6 (5; n=4) lOng, eVenly curVed ShOrt Shaft, Straight pOint 12–15 (14; n=4) lOng. Ventral bar 48–52 (50; n=4) lOng, 4–5 (4; n=4) Wide, 5–8 (7; n=4) high, Straight tO Slightly bent. DOrSal bar 19–23 (21; n=3) lOng, 3 (n=3) Wide, 4 (n=3) high, narrOW and Slightly bent. SeVen pairS Of Similar hOOkS, 11–12 (11; n=3) lOng, preSenting thin and delicate Shaft, FH lOOp abOut ½ Of Shank length.

Remarks. ThiS neW SpecieS differS frOm itS cOngenerS mainly by the Shape Of acceSSOry piece reSembling One ‘Sickle’. Heteropriapulus anchoradiatus n. sp. alSO haS the acceSSOry piece cOmpOSed Of 2 StrOngly SclerOtized SubunitS, by the mOrphOlOgy Of theSe StructureS iS markedly different (cOmpare Fig. 4 View FIGURE 4 D and Fig. 6 View FIGURE 6 D). Heteropriapulus simplex and H. bitomus n. sp. haVe the acceSSOry piece cOmpOSed Of Only One unit WhereaS H. heterotylus preSentS 3 Or 4 SubunitS. AdditiOnally, the Superficial rOOt Of dOrSal anchOrS in H. falxus n. sp. iS prOpOrtiOnally mOre elOngated and narrOWer than that Of the cOngenerS. The Vagina Of thiS neW SpecieS iS Weakly SclerOtized and the SmalleSt amOng all SpecieS Of the genuS.