Alcha sinensis Wang & Hu, 2019
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publication ID |
https://doi.org/ 10.12651/JSR.2020.9.3.269 |
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persistent identifier |
https://treatment.plazi.org/id/8D23230D-2121-E133-8A5E-F998FE66FAFC |
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treatment provided by |
Felipe |
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scientific name |
Alcha sinensis Wang & Hu, 2019 |
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Alcha sinensis Wang & Hu, 2019 ( Fig. 1 View Fig )
New locality. Anmyeon Island , Chungcheongnam-do, Korea (36°24 ʹ 43.5 ʺ N, 126°22 ʹ 34.3 ʺ E), on brown algae in the intertidal zone (13 July 2019, 3 November 2019) GoogleMaps .
Known distribution. South China Sea, Eastern Shenzhen City, Guangdong Province, China ( Hu et al., 2019).
Material examined. Observations on two live animals. KOR-UW1-WM5 (salinity 31‰, July 13, 2019): whole-mounted specimen. KOR-UW3-WM1 (salinity 34‰, November 3, 2019): whole-mounted specimen.
Description. Animals 0.8 - 0.9 mm long ( Fig. 1A, B View Fig ). General morphology as in Hu et al. (2019). Central two quarters of its body completely dark-blue because of dorsal subepidermal pigment granules, anterior and posteri- or quarter with brown-yellow parenchymatous pigment granules ( Fig. 1B, C View Fig ), particularly around paired ovaries (o, Fig. 1B, C View Fig ). Cone-shaped proboscis about 140 μm long (p, Fig. 1B View Fig ). Two black eyes situated posterior to proboscis (e, Fig. 1B View Fig ). Pharynx about 120 μm in diam. and at 30 - 40% of body length (ph, Fig. 1B View Fig ). Vitellaria poorly visible, stretching from pharynx to posterior end of animals (vi, Fig. 1B View Fig ). One of the specimens carries a 200 μm-long fertilized egg (eg, Fig. 1B View Fig ).
Male system consists of paired testes, situated midbody beside and behind pharynx (t, Fig. 1B View Fig ), paired seminal vesicles (sv, Fig. 1B View Fig ), and prostate stylet type III lo- cated inside male atrium (st, Fig. 1B View Fig ). Stylet is about 43 μm long and has a complex morphology. Proximal base (“skirt” in Karling & Schockaert, 1977) is asymmetri- cally bowtie-shaped and carries two pairs of overlapping plates. Two plates of each pair differ in size and shape and are attached to each other along full length of fortified axis (“tongue” in Karling & Schockaert, 1977) arising from base. Largest plate of first pair (p1, Fig. 1D View Fig ) is more or less triangular with smooth straight edge on one side, smooth rounded corner (“blade” in Karling & Schockaert, 1977), and one fringed edge on the other side. Much smaller plate of first pair (p2, Fig. 1E View Fig ) has one more pronounced serrated edge over short distance followed by protruding rounded corner (“blade”). Largest plate of second pair (p3, Fig. 1F View Fig ) is similar to p1, but somewhat smaller and without rounded corner. Smallest plate of second pair (p4, Fig. 1G View Fig ) also has one more pronounced serrated edge, but over longer length than p2 and lacking protruding rounded corner.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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