Salvato in:
| Autori principali: | , , , , |
|---|---|
| Natura: | Recurso digital |
| Lingua: | |
| Pubblicazione: |
Zenodo
2025
|
| Soggetti: | |
| Accesso online: | https://doi.org/10.5281/zenodo.14763560 |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
Sommario:
- <p><b><i>Acleotrema diplobulbus</i> (Yamaguti, 1968) Dominques & Boeger, 2007</b></p><p>Syn. <i>Diplectanum diplobulbus</i> Yamaguti, 1968</p><p><i>Heteroplectanum diplobulbus</i> (Yamaguti, 1968) Rakotofiringa, Oliver & Lambert, 1987</p><p>Figs 2A–H, 6B</p><p><b>Host.</b> <i>Kyphosus vaigiensis</i> (Quoy & Gaimard, 1825) (Centrarchiformes: Kyphosidae), brassy chub.</p><p><b>Locality.</b> Off Puerto Santa Rosa (6°52’S, 79°55’W), Lambayeque, Peru, South America.</p><p><b>Deposited material.</b> 3 voucher specimens (MUSM 5518a–c)</p><p><b>Site in host.</b> Gill filaments.</p><p><b>Redescription.</b> 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.</p><p><b>Remarks.</b> This species was described by Yamaguti (1968) as <i>Diplectanum diplobulbus</i> Yamaguti, 1968 from the gills of <i>Kyphosus cinerascens</i> (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 <i>A. diplobulbus</i> reveals the presence of a single ejaculatory bulb containing an elongated sclerotized internal tube. New illustrations and morphometric data for <i>A. diplobulbus</i> are provided, and this finding constitutes a new geographical record for this diplectanid.</p>