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Zenodo
2026
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| Accès en ligne: | https://doi.org/10.5281/zenodo.19178042 |
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- <p><b><i>Gnosonesima laumeri</i> sp. nov.</b></p><p>http://zoobank.org/ urn:lsid:zoobank.org:act: E2B2068F-95B9-44D6-BB5F-21B28CEC5764</p><p>Ocean Census species No. 363</p><p>(Fig. 1)</p><p><b>Diagnosis.</b> Species of <i>Gnosonesima</i> unpigmented and without eyes. Male copulatory bulb including an 80-µm-long, straight stylet, ending in a sharp tip with an obliquely angled opening.</p><p><b>Etymology.</b> Species dedicated to Dr Christopher Laumer in recognition of his contribution to the study of gnosonesimids and his invaluable insights into the platyhelminth phylogeny.</p><p><b>Material.</b> One specimen studied alive and whole-mounted, designated holotype (USNM 1694165).</p><p><b>Description.</b> The specimen measured 433 µm long, with a pointed anterior and a broad posterior end (Fig. 1A). It was colourless and without eyes. The pharynx (Fig. 1A–B: ph) measured 217 µm in length and 96 µm at its widest posterior point. The internal pharynx (Fig. 1A–B: iph) was 63 µm long and 52 µm at its widest point.</p><p>The genital organs were in the posterior half of the body. There were two testes (Figs. 1A, 1C: t) which connected to a seminal vesicle (Figs. 1A, 1C: sv). The seminal vesicle opened proximally into the male bulb, which includes proximally the prostate vesicle (Fig. 1C: pv) and carries a stylet (Figs. 1A, 1C: st; 1D–E). The stylet was 80 µm long, straight, tapering towards an oblique, sharp tip. The male accessory organ (Fig. 1: ao) was relatively long and presented a proximal, sac-shaped, glandular area, and a distal poorly developed stalk (maybe not fully developed or lined by weak muscles). The male gonopore (Fig. 1C: mg) opened at 60% and was surrounded by a glandular area (Fig. 1C: g).</p><p>The female system was not developed. However, posterior to the male system the primordia of ovaries (Fig. 1C: pov) and a bursa (Fig. 1C: pb) were differentiated.</p>