Zehntneriana Ng and Takeda, 2010

Genus Zehntneriana Ng and Takeda, 2010 View in CoL

Zehntneriana amakusae (Takeda and Miyake, 1969)

( Figs. 8–9 View Fig View Fig )

Litocheira amakusae Takeda & Miyake, 1969b, p. 10 , fig. 1.

Zehntneria amakusae View in CoL : Takeda, 1972, p. 40 (in discussion). — Yamaguchi et al., 1987, p. 22, pl. 10 figs. 4–5. — Takeda & Marumura, 1995, p. 3, pl. 1 fig. 6. — Ng et al., 2008, p. 144 (in list).

Zehntneriana amakusae View in CoL : Ng & Takeda, 2010, p. 49 (in discussion). —Lee et al. . 2011, p. 193, figs. 3–4. — Ko & Lee, 2012, pp. 4 (in list), 30, pl. 11A. — Ng & Lin, 2015, p. 264, fig. 4. — Maenosono, 2019, pp. 16, 19 (in key).

Pseudolitochira integra (Miers, 1884) View in CoL : Machida, 2017, p. 53, figs. 2–3.

Material examined. ɹOse-zaki, Suguga Bay,

9 m depth, 1 8(cb 6.3 mm, cl 4.9 mm), NSMT-Cr

32424, 4-XI-2023, coll. H. Takakura.

Remarks.ɹ Zehntneriana is a replaced name of the genus Zehntneria Takeda, 1972 , because it is a junior homonym of the same name for African orthopteran insect (cf. Ng and Takeda, 2010). The genus is at present composed of six species from the West Pacific, and five of them are known from Japanese waters — Z. amakusae (Takeda and Miyake, 1969) , Z. miyakei ( Takeda, 1972) , Z. novaeinsulicola (Takeda and Miyake, 1977) , Z. tadafumii Lee, Kim and Ng, 2015 , and Z. serrta Ng and Lin, 2015 . They were well studied by Maenosono (2019, 2021a) based on the specimens from the Ryukyu Islands, with comments on Z. amakusae .

The present female ( Fig. 8 View Fig ) lacks both chelipeds and the right second to fourth ambulatory legs, but agrees quite well with Zehntneriana amakusae (Takeda and Miyake, 1969) , which was described on an ovigerous female (holotype) and three males and three females (paratypes) from the Amakusa Islands, west of Kyushu. The original description and figures ( Takeda and Miyake, 1969b), and also the color photograph and line drawings ( Lee et al., 2011) seem to be thorough for the identification, with several sub- sequent records from Japan and Korea.

The female examined is characteristic in having the fur of short soft hairs along the frontal, orbital and anterolateral margins of the carapace. This character is obscurely seen in the present monochrome photograph ( Fig. 8 View Fig ), but traceable as a shallow depression and comparable with the original figure ( Fig. 9 View Fig ). The carapace anterolateral margin ( Fig. 9 View Fig ) is typically cut into three low teeth, but as mentioned in the original description, the teeth are not always sharp just as in the present female.

As realized from the key to Japanese species of the genus Zehntneriana by Maenosono (2019), this species is most close to Z. miyakei from the Palau and Ryukyu Islands, and also to Z. novaeinsulicola from the Nishino-shima Island in the Ogasawara Islands, some islands of the Ryukyu Islands, and Shiono-misaki at the Kii Peninsula, Pacific coast of central Honshu. However, Z. miyakei is characteristic in having the bare carapace without fur and the remarkably long first to third ambulatory legs, with the meri serrulated throughout the anterior margins, and Z. novaeinsulicola is characterized by the rather oval carapace bearing fur not defined clearly along the frontal, supraorbital and anterolateral margins of the carapace

Distribution.ɹThe type locality is the Amakusa Islands, west of Kyushu, Japan, ca. 40 m depth. The geographical range is from Suruga Bay recorded in this paper to the south and west of Kyushu, Japan, and Jejudo Island, southern Korea. From intertidal zone to the depth of 100 m.