Aetohemecus, Warren & Bullard, 2021

Warren, Micah B. & Bullard, Stephen A., 2021, Fish blood flukes (Digenea: Aporocotylidae) from Indonesia: Two new genera and species infecting the banded eagle ray, Aetomylaeus nichofii (Bloch and Schneider, 1801) Capape´and Desoutter, 1979 (Myliobatiformes: Myliobatidae) from Borneo, International Journal for Parasitology: Parasites and Wildlife 15, pp. 43-50 : 45

3.1. Aetohemecus n. gen ( Figs. 1–2 )

3.1.1. Generic diagnosis

Body 4–6 × longer than wide, dorsoventrally flattened, ventrally concave, having anterior and posterior ends tapering equally, spinous; lateral tegumental spines C-shaped, directed ventrally, each on a muscular peduncle, distributing in a single ventrolateral column, not continuous anteriorly nor posteriorly. Rosethorn-shaped spines lacking. Nervous system comprising paired lateral nerve cords. Anterior sucker aspinous, lacking peduncle, diminutive, occupying space between anterior-most lateral tegumental spines. Mouth on mid-ventral surface of anterior sucker. Pharynx not evident. Oesophagus extending sinuously posteriad along mid-line for 1/3 of body length. Intestinal caeca X- or H-shaped, connecting to oesophagus ventrally, lacking diverticulae, posterior caeca terminating in anterior half of body. Testis single, medial, occupying middle 1/3 of body. Auxiliary external seminal vesicle lacking. Cirrus-sac present, enveloping internal seminal vesicle and cirrus. Ovary medial, ventral to ascending uterus, post-caecal, post-testicular; post-ovarian space comprising 1/6–1/4 of body length. Oviducal ampulla present. Laurer’ s canal absent. Ootype ¨medial, posterior to genitalia, comprising an inconspicuous ovoid chamber. Uterus extending anterior to ovary; uterine eggs irregular, thin-shelled. Vitellarium follicular, symmetrical posteriorly, filling space between nerve commissure to ovary; common vitelline collecting duct extending from dextral branch of vitellarium. Common genital pore dorsal, post-gonadal, anterior to level of ootype ¨.

Figures

Fig. 1-2. Aetohemecus kirstenjensenae Warren and Bullard n. gen., n. sp. (Digenea: Aporocotylidae) from the heart of the banded eagle ray, Aetomylaeus nichofii (Bloch and Schneider, 1801) Capape´and Desoutter, 1979 (Myliobatiformes: Myliobatidae). (1) Body of holotype (USNM No. 1642775), dorsal view. Bar = 250 μm. (2) Genitalia, paratype (USNM No. 1642776), ventral view. Bar = 100 μm. Mouth (mo), nerve commissure (nc), oesophagus (os), vitellarium (vit), intestine (i), testis (t), uterus (u), metraterm (met), ovary (o), vas deferens (v), seminal vesicle (sv), cirrus sac (cs), cirrus (c), vitelline duct (vd), common genital pore (cgp), oviducal ampullae (oa), and o¨otype (oo).