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Figure 3 in Observations on the mating behaviour and related copulatory anatomy of Alaena margaritacea Eltringham, 1929 (Papilionoidea: Lycaenidae: Poritiinae)

Figure 3 – Mating pair, female on top and male below: A – red arrow indicates tip of female abdomen; B – images showing the titled angle of copulation: C – close-up of Fig. 3B.

Figure 1 in Observations on the mating behaviour and related copulatory anatomy of Alaena margaritacea Eltringham, 1929 (Papilionoidea: Lycaenidae: Poritiinae)

Figure 1 – Google Earth polygon (shaded area) of TL breeding area of Alaena margaritacea; an area of about 650 m2.

Figure 5 in Observations on the mating behaviour and related copulatory anatomy of Alaena margaritacea Eltringham, 1929 (Papilionoidea: Lycaenidae: Poritiinae)

Figure 5 – The red arrow points to the shiny black button ventrally at a distance away from the posterior tip of a living female abdomen.

Figure 6 in Observations on the mating behaviour and related copulatory anatomy of Alaena margaritacea Eltringham, 1929 (Papilionoidea: Lycaenidae: Poritiinae)

Figure 6 – SEM micrograph of ostium bursa of A. margaritacea female. It is situated ventrally towards the posterior end of the abdomen. Note the hardened cup and the substance covering the orifice (image: W. Landman).

Figure 2 in Observations on the mating behaviour and related copulatory anatomy of Alaena margaritacea Eltringham, 1929 (Papilionoidea: Lycaenidae: Poritiinae)

Figure 2 – Mating pair, female on top and male below: A – female wafting her wings; B – pair moved to a position where they are screened by an unidentified fern.

Figure 4 in Observations on the mating behaviour and related copulatory anatomy of Alaena margaritacea Eltringham, 1929 (Papilionoidea: Lycaenidae: Poritiinae)

Figure 4 – Abdomen of a female specimen. The red arrow points to the shiny black button-like structure situated at a relative distance away from the posterior tip (marked "p"). This button or sclerotized cup is part of the complex ostium bursa, which partially covers the vaginal orifice.

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Data from: Pre-copulatory reproductive behaviours are preserved in Drosophila melanogaster infected with bacteria

<p>The activation of the immune system upon infection exerts a huge energetic demand on an individual, likely decreasing available resources for other vital processes, like reproduction. The factors that determine the trade-off between defensive and reproductive traits remain poorly understood. Here, we exploit the experimental tractability of the fruit fly <em>Drosophila melanogaster</em> to systematically assess the impact of immune system activation on pre-copulatory reproductive behaviour. Contrary to expectations, we found that male flies undergoing an immune activation continue to display high levels of courtship and mating success. Similarly, immune-challenged female flies remain highly sexually receptive. By combining behavioural paradigms, a diverse panel of pathogens and genetic strategies to induce the fly immune system, we show that pre-copulatory reproductive behaviours are preserved in infected flies, despite the significant metabolic cost of infection.</p>

Fig. 8 in Re-description of Thysanozoon nigropapillosum (Polycladida: Pseudocerotidae) from the South China Sea, with observations on a novel pre-copulatory structure, sexual behaviour and diet

Fig. 8. Multi-rayed star-like spicules of colonial tunicates Didemnum sp. in food pellets of Thysanozoon nigropapillosum (Hyman, 1959).

Fig. 6 in Re-description of Thysanozoon nigropapillosum (Polycladida: Pseudocerotidae) from the South China Sea, with observations on a novel pre-copulatory structure, sexual behaviour and diet

Fig. 6. Longitudinal section of Thysanozoon nigropapillosum (Hyman, 1959). A, pharynx and main intestine; B, food pellet remains inside the main intestine. fp, food pellet; mi, main intestine; ph, pharynx.

Fig. 9 in Re-description of Thysanozoon nigropapillosum (Polycladida: Pseudocerotidae) from the South China Sea, with observations on a novel pre-copulatory structure, sexual behaviour and diet

Fig. 9. Thysanozoon nigropapillosum (Hyman, 1959): copulation observed at Longdong bay, northeast coast of Taiwan, 25 July 2011. A, Dermal impregnation for unilateral insemination; B, One individual (right), with the paired penis stretched, gripping its partner (left) at the outermost margin. (spermatophore is indicated by an arrow)

Fig. 7 in Re-description of Thysanozoon nigropapillosum (Polycladida: Pseudocerotidae) from the South China Sea, with observations on a novel pre-copulatory structure, sexual behaviour and diet

Fig. 7. Thysanozoon nigropapillosum (Hyman, 1959) A, with colonial tunicates (indicated by arrows), found at Longdong Bay, Northeast Coast of Taiwan, 28 August 2008; B, regurgitated food pellet (indicated by arrowhead). Chuanfanshr, Kenting, southern Taiwan, 9 February 2006.

Fig. 4 in Re-description of Thysanozoon nigropapillosum (Polycladida: Pseudocerotidae) from the South China Sea, with observations on a novel pre-copulatory structure, sexual behaviour and diet

Fig. 4. Thysanozoon nigropapillosum (Hyman, 1959): rhabdites on epidermis (indicated by arrows). A, B, on the tips of papillae; C, distributed on the inner surface of the male atrium; D, distributed on the female pore.

Fig. 5 in Re-description of Thysanozoon nigropapillosum (Polycladida: Pseudocerotidae) from the South China Sea, with observations on a novel pre-copulatory structure, sexual behaviour and diet

Fig. 5. Distribution of Thysanozoon nigropapillosum (Hyman, 1959) A, around Taiwan; B, type locality (hollow square), and the probably distribution of Newman et al. (2003) collection (filled triangles), the distribution of Gosliner et al. (1996) collection (filled circles) in Indo-west Pacific.

Fig. 3 in Re-description of Thysanozoon nigropapillosum (Polycladida: Pseudocerotidae) from the South China Sea, with observations on a novel pre-copulatory structure, sexual behaviour and diet

Fig. 3. Diagrammatic representation of the reproductive anatomy of Thysanozoon nigropapillosum (Hyman, 1959). A, male. e, ejaculatory duct; in, intestine; ma, male pore; pr, prostate gland; se, seminal vesicle; sp, sperm; st, stylet; v, vas deferens. B, female. c, cement gland; f, female pore; mi, main intestine; p, pharynx; v, vagina.

Fig. 2 in Re-description of Thysanozoon nigropapillosum (Polycladida: Pseudocerotidae) from the South China Sea, with observations on a novel pre-copulatory structure, sexual behaviour and diet

Fig. 2. Thysanozoon nigropapillosum (Hyman, 1959). Anterior is to the right. A, dorsal view; B, ventral view. ce, cerebral eyespots; fp, female pore; m, mouth; mp, male pore; ph, pharynx; pt, pseudotentacle; s, sucker.

Fig. 1 in Re-description of Thysanozoon nigropapillosum (Polycladida: Pseudocerotidae) from the South China Sea, with observations on a novel pre-copulatory structure, sexual behaviour and diet

Fig. 1. Holotypes of Acanthozoon nigropapillosum Hyman, 1959 (Polycladida: Pseudocerotidae) at the Smithsonian Institution National Museum of Natural History, Washington D.C., USA. No. USNM 28661. Photograph by: Dr. Ning Chao.