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

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Heteropriapulus semitortus

n. sp.

Heteropriapulus semitortus  n. sp.

urn:lSid:zOObank.Org:act:35 A68837View Materials -DE63-454D-A251-D8C4 CD532288View Materials ( Fig. 9View FIGURE 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)GoogleMaps  .

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. 9View FIGURE 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. 3View FIGURE 3 C and 9E). Heteropriapulus bitomus  n. sp. alSO preSentS acceSSOry piece cOmpOSed Of a Single unit, but Of a different Shape (cOmpare FigS. 5View FIGURE 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.