Quadriacanthus submarginati Bahanak, Nack & Pariselle, 2016

Bahanak, Dieu ne dort, Nack, Jacques, Pariselle, Antoine & Bilong Bilong, Charles F., 2016, Description of three new species of Quadriacanthus (Monogenea: Ancyrocephalidae) gill parasites of Clarias submarginatus (Siluriformes: Clariidae) from Lake Ossa (Littoral region, Cameroon), Zoologia (e 20160044) 33 (4), pp. 1-8 : 5-6

Quadriacanthus submarginati Bahanak, Nack & Pariselle sp. nov.

Fig. 5

urn:lsid:zoobank.org:act:423B9D06-68FA-4424-86F6-4D532D7075F4

Description (based on 22 specimens, all mounted in GAP): adults measure 399.6 (250.6-572.3) length, 63.8 (11.6-113.6) wide at level of ovary. Pharynx circular is 21.7 (20.2-21.6) wide. Penis wide-opened at basal extremity, tapering, bent and forked at the distal extremity, Pe = 29.7 (25.8-31.6). Accessory piece tubular, slightly curved, with a complex structure made up of one long tip flanked by a short tip and by a bulb, Ap = 21.8 (19.2-25.8). Tubular curved vagina, slim and slightly sclerotized at basal zone, and connected to a large seminal receptacle which opens near vaginal pore, Vg = 26.9 (25.3-32.1). Hooklets pair I = 13.7 (12.7-14.7), II = 14 (12.9-14.7), III = 14.3 (12.5-15.7), IV = 21.1 (19.7-24.3), V = 13.6 (12.3-14.8), VI = 14.1(12.5-15.1), VII = 14.1 (11.7-15.7). Dorsal bar with a rectangular centre, Ct = 19.1 (16.7-23.3), w = 8.5 (6-11.5) wide, a median posteriorly directed triangular process, h = 5.3 (4-6.5), and two lateral expansions, x = 29.2 (26.4-32.9), dorsal anchor lacking shaft, but with reduced guard, curved blade at distal region and mean point, a = 32.7 (30-34.7), ba = 9.1 (7.7-10), e = 8.4 (6.1-9.7), triangular and slightly curved dorsal cuneus (or patch), i = 3.5 (2.1-3.1), j = 6.3 (5.1-7.1), ventral bar made up of two branches medially articulated, x = 43 (37.9-47.7), w = 5.5 (3.5-7.6), ventral anchor without shaft, but with reduced guard, curved blade, and with long point, a = 24.7 (22.8-26.9), ba = 5.8 (5.1-6.3), e = 10.8 (8-11.7), ventral cuneus (or patch) smaller than dorsal one, i = 1.7(1.2-2), j = 3.8 (4.6-4.9).

Type host. Clarias submarginatus Peter, 1882 .

Site. Gills.

Type locality. Lake Ossa , Cameroon (3°45’- 3°51’N, 9°58’- 10°03’E).

Type specimens. Holotype deposited at the Royal Museum for Central Africa (Tervuren): #37937 . Paratype deposited at the Royal Museum for Central Africa (Tervuren): #37938 .

Materials studied. 43 host individuals and 22 monogeneans.

Parasitic indices. Prevalence = 45.5%, mean abundance = 2.8 ± 3.8.

Etymology. The specific name, submarginati refers to specific name of the host.

Remarks. This species is close to Q. macruncus sp. nov. in the morphology of the dorsal and ventral bars, dorsal and ventral anchors; it differs from it in the morphology of the copulatory complex and the size of the point of its dorsal (e = 6.1-9.7 vs 1.9-3.1) and ventral (e = 8-11.7 vs 3.2-4.3) anchors.

Figures

Figure 5. Sclerotized parts of Quadriacanthus submarginati sp. nov.: (Cc) copulatory complex, (Da) dorsal anchor, (Db) dorsal bar, (Dcn) dorsal cuneus,(H) hooklets, (Va) ventral anchor,(Vb) ventral bar, (Vcn) ventral cuneus,(Vg) vagina,(SR) seminal receptacle. Scale bar: 20 µm.