Acleotrema diplobulbus Dominques & Boeger 2007
Creators: name: Santillan, Angel L.
name: Cruces, Celso L.
name: Mondragón-Martínez, Aarón
name: Rojas, Rosa Martínez-
name: Chero, Jhon D.
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Platyhelminthes
Monogenea
Dactylogyridea
Diplectanidae
Acleotrema
Acleotrema diplobulbus

description: Acleotrema diplobulbus (Yamaguti, 1968) Dominques & Boeger, 2007
Syn. Diplectanum diplobulbus Yamaguti, 1968
Heteroplectanum diplobulbus (Yamaguti, 1968) Rakotofiringa, Oliver & Lambert, 1987
Figs 2A–H, 6B
Host. Kyphosus vaigiensis (Quoy & Gaimard, 1825) (Centrarchiformes: Kyphosidae), brassy chub.
Locality. Off Puerto Santa Rosa (6°52’S, 79°55’W), Lambayeque, Peru, South America.
Deposited material. 3 voucher specimens (MUSM 5518a–c)
Site in host. Gill filaments.
Redescription. Based on 3 specimens: 2 mounted in Gomori’s trichrome 1 mounted in Hoyer’s medium: Body elongate, fusiform, 575–896 (716; n =3) long; greatest wide 100–115 (106; n = 3) usually at level of testis. Scales not observed. Cephalic region narrow, with one terminal and 2 bilateral poorly developed cephalic lobes; 3 bilateral pairs of conspicuous head organs; bilateral pair of conspicuous unicellular cephalic glands posterolateral to pharynx. Two pairs of eye-spots present, equidistant; accessory chromatic granules absent (Fig. 2A). Pharynx spherical, 28–46 (36; n = 3) in diameter; esophagus short; intestinal caeca unbranched, extending from anterior to near posterior end of trunk, not confluent posteriorly. Haptor differentiated from body proper, laterally expanded, 49–68 (57; n = 3) long, 157–182 (169; n = 3) wide. Anchors dissimilar (Fig. 2B–C). Ventral anchor 31–37 (33; n = 3); with elongate superficial root; well-elongate, broad deep root, larger than superficial root; straight shaft with two lateral knob at base; and recurved point; point not surpassing level of tip of superficial root; 5 (5; n = 3) wide. Dorsal anchor 19–20 (20; n = 2) long, with inconspicuous superficial root; short deep root; slightly curved, broad shaft; and recurved point; surpassing level of tip of superficial root; base 6–8 (7; n = 2) wide. Ventral bar 127–151 (137; n = 3) long, elongate, with mid-ventral longitudinal groove, tapered ends (Fig. 2D). Dorsal bars 51–73(59; n = 3) long, curved, with lateral projection (Fig. 2E). Fourteen similar hooks, 8–10 (9; n = 3) long, each with depressed obtuse thumb, slender and slightly curved shank, and short point; filamentous hook (FH) loop about shank length; hook pair 1 at level of ventral bar; hook pair 5 at level of ventral anchor shaft, others submarginal pairs on lateral haptoral lobes (Fig. 2F). Squamodiscs, similar, each 40–57 (49; n = 3) long; 82–92 (87; n = 3) wide, with 27 (27; n = 2) concentric rows; dumbbell-shaped rodlets (Fig. 2G). Genital atrium sclerotized. MCO dagger-shaped, 34 (34; n = 3) long; MCO base ring-shaped; MCO surrounded by weakly sclerotized sac (Fig. 2I). Ejaculatory bulb strongly muscular, oblong with elongate sclerotized internal tube. Testis ovate, 83–104 (93; n = 2) long, 59–70 (64; n = 2) wide; vas deferens not looping left intestinal caeca, dilating to form elongate sinuous seminal vesicle in left side of trunk, lateral to ovary; prostatic reservoir, prostatic glands not observed. Ovary elongate, pyriform, 40–60 (51; n = 8) long, 42–64 (51; n = 8) wide, looping dorsoventrally right intestinal caeca; uterus, oviduct, oötype not observed. Vagina tubular; seminal receptacle well developed (Fig. 2H). Vitelline follicles dense, extending from posterior level of pharynx to posterior end of trunk, absent in regions of reproductive organs. Eggs not observed.
Remarks. This species was described by Yamaguti (1968) as Diplectanum diplobulbus Yamaguti, 1968 from the gills of Kyphosus cinerascens (Forsskål, 7175) in Hawaii.According to Yamaguti (1968), the main morphological characteristic of this species is the presence of two muscular ejaculatory bulbs. However, the examination of paratype and newly collected specimens of A. diplobulbus reveals the presence of a single ejaculatory bulb containing an elongated sclerotized internal tube. New illustrations and morphometric data for A. diplobulbus are provided, and this finding constitutes a new geographical record for this diplectanid.
description: Published as part of Santillan, Angel L., Cruces, Celso L., Mondragón-Martínez, Aarón, Rojas, Rosa Martínez- & Chero, Jhon D., 2025, New and previously described Acleotrema species (Monogenea, Diplectanidae) parasitizing sea chubs (Centrarchiformes: Kyphosidae) in the Southeastern Pacific Ocean, pp. 533-548 in Zootaxa 5570 (3) on page 537, DOI: 10.11646/zootaxa.5570.3.5, http://zenodo.org/record/14745333