Hamacreadium lutiani ( Shen, 1990 ) Shen, 1990

Martin, Storm B., Cutmore, Scott C., Ward, Selina & Cribb, Thomas H., 2017, An updated concept and revised composition for Hamacreadium Linton, 1910 (Opecoelidae: Plagioporinae) clarifies a previously obscured pattern of host-specificity among species, Zootaxa 4254 (2), pp. 151-187 : 167

Hamacreadium lutiani ( Shen, 1990) n. comb.

( Figure 4 b)

Synonyms: Podocotyle lutiani Shen, 1990 .

Records. From the crimson snapper, Lutjanus erythropterus , in the South China Sea by Shen (1990).

Remarks. This species does not belong in Podocotyle , as defined by Cribb (2005a), because the genital pore is not pre-bifurcal and the vitelline follicles are not restricted to the hindbody. The morphology agrees with the concept of Hamacreadium proposed here, especially in that the excretory vesicle extends into the forebody. The description is insufficiently detailed to confidently distinguish it from other species. However, the anterior extent of the vitelline field appears to be distinctly post-bifurcal, separating it from H. hainanense and making it most similar to H. lethrini . It differs from H. lethrini in that the genital pore is distinctly extra-caecal, the intestinal bifurcation is broad instead of angular, the ventral sucker is distinctly inter-caecal and the body is broader, especially anteriorly. Finally, unlike in H. lethrini , the cirrus-sac is entirely anterior to the ventral sucker, although this position may be a consequence of flattening.

Figures

FIGURE 4. Reproduction with modification of type illustrations for (a) Hamacreadium longivesiculum (Yamaguti, 1952) n. comb. and (b) Hamacreadium lutiani (Shen, 1990) n. comb. Abbreviations: C, caecum; Cs, cirrus-sac; Ep, excretory pore; Ev, excretory vesicle; Gp, genital pore; O, ovary; Oes, oesophagus; Os, oral sucker; P, pharynx; T, testis; U, uterus; Vf, vitelline follicles; Vs, ventral sucker. Scale: 1000 µm, 1000 µm.