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Description

Based on 16 mature and 4 juvenile unfl attened, whole-mount specimens and 1 set each of serial sagittal sections from Sillaginodes punctatus. Measurements of worms from Sillago bassensis and Apogon fasciatus are given in Table 1. Measurements are of 10 gravid, unfl attened, dorso-ventrally mounted worms from Sillaginodes punctatus. Body elongate, oval, maximum width usually in area of gonads, sometimes in ventral sucker area, 1,345-2,062 (1,786) × 366-546 (479); width to length ratio 1:3.1-4.2 (3.7). Oral sucker globular, ventrally subterminal, 124-178 (143) × 132-194 (157). Ventral sucker sub-spherical, in anterior third of body, 184-267 (221) × 218-311 (256), sucker width ratio 1:1.5-1.7 (1.6). Forebody short, 371-550 (449) long, 21.8-29.7 (25.3)% of body-length. Prepharynx distinct, short, dorsal to oral sucker. Pharynx subglobular, 65-97 (77) × 78-117 (98); pharynx to oral sucker width ratio 1:1.4-1.7 (1.6). Oesophagus distinct, short. Intestinal bifurcation 48-156 (107) anterior to ventral sucker. Caeca terminate blindly close to posterior extremity. Testes 2, usually contiguous, rarely separate (n=1), tandem, with entire to incised anterior and posterior margins, anterior 137-282 (201) × 155-286 (239), posterior 184-338 (250) × 170-337 (244). Post-testicular region 312-498 (406) long, 19-27.4 (22.9)% body-length. Cirrus-sac clavate, thick walled, overlaps ventral sucker dorsally and extends posteriorly to point anterior to or slightly posterior to posterior margin of ventral sucker, 294-528 (403) × 64-142 (99). Internal seminal vesicle tubular, convoluted, fills most available space in posterior half of cirrus-sac. Pars prostatica distinct, small, surrounded by prostatic cells. Ejaculatory duct long, thick walled. Genital atrium small. Genital pore sinistral to and level with posterior end of oesophagus, anterior to intestinal bifurcation, 200-300 (251) from anterior end, 11.6-18.4 (14.2)% body-length. Ovary entire, spherical, contiguous with and antero-dextral to anterior testis, 109-208 (145) × 98-194 (144). Mehlis’ gland well developed, seen clearly in juvenile worms and sagittal sections, obscured by eggs in gravid whole-mounts, dorsally antero-sinistral and partly anterior to ovary. Canalicular seminal receptacle large, saccular, may be entirely dorsal or sinistral to ovary, overlapping left margin of ovary and anterior margin of anterior testis. Laurer’s canal present. Eggs oval, operculate, 54-79 (65) × 29-49 (37). Metraterm distinct, well developed, relatively long. Vitelline follicles extend from 176-282 (229) from anterior extremity, 10.9-15.4 (12.9)% of body-length, to 10-55 (21) from posterior extremity; fields separate ventrally in forebody, confl uent dorsally in forebody and post-testicular area; continuous follicle-free zone between ventral sucker and posterior margin of posterior testis, dorsally; follicles lie lateral, ventral and dorsal to caeca; anterior extent usually level with, or slightly anterior to or posterior to posterior margin of pharynx, rarely posterior to posterior limit of oesophagus (n=1). Excretory pore dorsally subterminal. Excretory vesicle I-shaped, narrow posterior end surrounded by gland-cells, widens anteriorly and passes to point antero-dorsal to posterior margin of ovary. Etymology: This species is named for Professor R. A. Shotter.

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Source: ZooKeys

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