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| Materyal Türü: | Recurso digital |
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Zenodo
2020
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| Konular: | |
| Online Erişim: | https://doi.org/10.5281/zenodo.20255186 |
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- <p><b><i>Thailandoniscus brehieri</i>, new species</b></p><p>(Figs. 4, 5, 10)</p><p><b>Material examined.</b> Myanmar: male holotype (MZUF 9887), Saddan Gu, 16°44'22.8"N 97°43'04.2"E, Kayin State, Hpa-An, 25 November 2015, leg. F. Bréhier; 2 males, 2 females paratypes (MZUF 9887), 1 male, 2 females paratypes (MNHN-IU-2019-502), same data as holotype.</p><p><b>Description.</b> Maximum length: male, 4.5 mm; female, 6 mm. Colourless, body outline as in Fig. 4A. Dorsal surface smooth with scattered triangular scale-setae (Fig. 4B). Several gland pores on lateral margins of pleonites 4 and 5, uropodal protopods, and dorsal surface of uropodal exopods (Fig. 4E). Cephalon (Fig. 4C, D) with suprantennal line rounded, bent down in middle part; antennal lobes narrow, quadrangular, obliquely directed outwards. Eyes absent. Posterior margin of pereonite 1 straight, and of pereonites 2–7 progressively more concave (Fig. 4A). Pleonites 3–5 with very short posterior points (Fig. 4A, E). Telson (Fig. 4E) almost 3 times as wide as long, with concave sides, narrow apical part and rounded apex. Antennula (Fig. 4F) with second article slightly shorter than first and third, third article coniform, bearing 6 aesthetascs. Antenna (Fig. 4G) with fifth article of peduncle as long as flagellum; flagellum of 6 articles with groups of aesthetascs on second to fourth article. Buccal pieces as in <i>T. whitteni</i>, new species. Pereopod 7 with water conducting system on basis. Pleopods 3–5 endopods irregular in shape with many rounded lobes (Fig. 5G). Uropod (Fig. 4E) with endopod shorter than exopod, endopod inserted proximally to exopod.</p><p>Male. Pereopod 1 (Fig. 5A) without particular modifications, merus with short scales on sternal margin. Pereopod 7 (Fig. 5B) ischium with sternal margin slightly convex, short scales on sternal margin of merus and on distal margin of carpus. Genital papilla as in Fig. 5C. Pleopod 1 (Fig. 5C) exopod triangular, with slightly concave outer margin and rounded apex; endopod distinctly longer than exopod, distal article flagelliform, with thin suture in middle part and slightly enlarged apical part. Pleopod 2 (Fig. 5D) exopod subrectangular with short setae at apex; endopod of two thickset articles, second article more than 3 times longer than first, slightly bent outwards, rounded apex. Pleopod 3 and 4 exopods (Fig. 5E, F) subtriangular with apical seta, few setae on ventral surface and fringe of long thin setae on outer and inner margins. Pleopod 5 exopod (Fig. 5H) ovoidal, with apical seta, few setae on ventral surface, fringe of thin setae along margins, and 2 rounded lobes on dorsal surface.</p><p><b>Etymology.</b> <i>Thailandoniscus brehieri</i> is named after Dr. Franck Bréhier (Alas, Balaguères, France) who collected the specimens.</p><p><b>Remarks.</b> <i>Thailandoniscus brehieri</i> is morphologically similar to <i>T. whitteni</i>, from which it is readily distinguishable by the smooth dorsum (vs. tuberculated), the antennula not apically enlarged with a shorter number of aesthetascs (six vs. 10 or 11), male pleopod 1 exopod with outer margin less concave, and male pleopod 2 endopod with rounded apical margin (vs. bearing a triangular lobe). <i>Thailandoniscus brehieri</i> differs from <i>T. annae</i> in the antennula with six instead of three aesthetascs, the antenna with six instead of four flagellar articles, wider male pleopod 1 exopod, and male pleopod 2 endopod with rounded instead of truncate apex. The specimens were collected on the ground and not in water. However, the fring of long setae on the pleopod 3–5 exopods shows that the species might have an amphibious way of life.</p>