Heteropriapulus semitortus, 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 : 475-476

Heteropriapulus semitortus n. sp.

urn:lSid:zOObank.Org:act:35 A68837 -DE63-454D-A251-D8C4 CD532288 ( Fig. 9)

Type and only known host. Rhinelepis aspera SpiX & AgaSSiz ( SilurifOrmeS : LOricariidae ). Site of infection. GillS.

Type locality. Aguapeí RiVer , municipality Of CaStilhO (Paraná RiVer baSin) , SãO PaulO State , Brazil (21°3'36.20"S, 51°45'38.58"W) .

Type specimens. HOlOtype (CHIOC 38838a); 6 paratypeS in CHIOC (38838b; 38839–38841a, b; 38842); 5 paratypeS in CHIBB (298–302L) and 1 paratype in IPCAS (M- 657).

Etymology. The name iS frOm Latin and referS tO the Shape Of the cirruS that iS half tWiSted (semi = half + tortus = tWiSted).

Description. BaSed On 13 SpecimenS mOunted in HOyer’S medium. BOdy 295–412 (345; n=8) lOng, greateSt Width 69–127 (95; n=8) 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 34–44 (40; n=13), Straight in anteriOr pOrtiOn, fOrming 2½ cOunterclOckWiSe Spiral ringS neXt tO rOunded baSe. AcceSSOry piece 23–26 (24; n=13) lOng, cOmpOSed by Single Straight unit functiOning aS cirruS guide ( Fig. 9 E). Vaginal canal nOn-SclerOtized. HaptOr 40–66 (51; n=8) lOng, 46–111 (79; n=8) Wide, SubtrapezOidal. Ventral anchOrS 12–16 (14; n=13) lOng, length tO nOtch 18–22 (20; n=13), flattened baSe 6–8 (7; n=13) Wide, elOngate Shaft, pOint 13–17 (15; n=13) lOng With recurVed tip; anchOr filament dOuble, Well-deVelOped; SclerOtized patch aSSOciated With Ventral anchOr abSent. DOrSal anchOrS 12–14 (13; n=13) lOng, length tO nOtch 11–12 (12; n=13), elOngate Superficial rOOt 4–5 (4; n=13) lOng, incOnSpicuOuS deep rOOt 1–2 (2; n=13) lOng, eVenly curVed ShOrt Shaft, Straight pOint 5–7 (7; n=13) lOng, anchOr filament dOuble, mOderately deVelOped. Ventral bar bent, 40– 47 (44; n=10) lOng, 3–4 (4; n=10) Wide, 6–14 (11; n=9) high. DOrSal bar ShOrt, Slightly bent, 18–19 (18; n=9) lOng, 2–3 (2; n=9) Wide, 4–7 (6; n=9) high. SeVen pairS Of Similar hOOkS, 9–10 (9; n=13) lOng, FH lOOp abOut ¾ Of Shank length.

Remarks. ThiS neW SpecieS iS eaSily differentiated frOm itS cOngenerS by the mOrphOlOgy Of itS cOpulatOry cOmpleX. The acceSSOry piece iS cOmpOSed Of a Single, Straight unit reSembling that Of H. simplex but differS by the Shape Of the cirruS Which iS SigmOid in H. simplex and WithOut cOilS neXt tO the baSe (cOmpare FigS. 3 C and 9E). Heteropriapulus bitomus n. sp. alSO preSentS acceSSOry piece cOmpOSed Of a Single unit, but Of a different Shape (cOmpare FigS. 5 C and 9E). The acceSSOry piece Of Other SpecieS ( H. anchoradiatus n. sp., H. falxus n. sp., H. heterotylus , H. microcleithrus n. sp. and H. pterygoplichthyi n. sp.) iS mOre cOnSpicuOuS, rObuSt, that differ in Shape and cOmpriSe mOre than One Subunit. The cirruS Of H. semitortus n. sp. fOrmS 2½ cOunterclOckWiSe Spiral ringS neXt tO the rOunded baSe, WhereaS that Of Other SpecieS cOntain feWer Spiral ringS: 1½ in H. anchoradiatus n. sp., H. falxus n. sp., H. microcleithrus n. sp., H. heterotylus , and H. bitomus n. sp., and 2 in H. pterygoplichthyi n. sp.. Heteropriapulus semitortus n. sp. dOeS nOt preSent SclerOtized patch aSSOciated With the baSe Of Ventral bar, like H. simplex , H. anchoradiatus n. sp. and H. microcleithrus n. sp.