Lysmata lipkei Okuno & Fiedler, 2010

Ashrafi, Hossein, Baeza, J. Antonio & Ďuriš, Zdeněk, 2021, The caridean shrimps of the genus Lysmata Risso, 1816 (Decapoda: Lysmatidae) from Madagascar collected during the Atimo-Vatae expedition: a new species and two new records, European Journal of Taxonomy 774, pp. 155-177 : 171-172

Lysmata lipkei Okuno & Fiedler, 2010

Fig. 8

Lysmata lipkei Okuno & Fiedler 2010: 599 , figs 1–4.

Diagnosis

Carapace with rostrum reaching to about middle of second antennular article, armed with 4–5 teeth on dorsal margin (including two postorbital ones) and 2–4 on ventral margin; antennal tooth welldeveloped; pterygostomial angle with small acute tooth. Antennule with stylocerite subacute, falling short of reaching to end of first antennular segment; lateral flagellum with accessory ramus consisting of short one-segmented finger-shaped article. Antenna with inferior tooth of basicerite strong; scaphocerite distinctly surpassing antennular peduncle, lateral margin slightly concave, distolateral tooth slightly overreaching blade; carpocerite small, not reaching to end of first antennular article.

First pereiopod robust, chela with fingers bearing a narrow gap when closed, especially on proximal half. Second pereiopods unequal in size, longer one with 27–32 and shorter one with 23–27 carpal segments. Third pereiopod with merus armed with spinules on distal 0.6 of segment length; carpus unarmed; dactylus biunguiculate, ventral margin with two or three accessory spines, decreasing in size toward

proximal margin (in case of having three accessory teeth, proximal one very small). Fifth pereiopod with merus armed with 1–3 spinules disto-ventrally.

Pleon with three anterior pleura rounded antero- and postero-ventrally, fourth pleuron angled posteroventrally, fifth pleuron with small acute tooth postero-ventrally. Posterior margin of telson with small acute median projection and two pairs of spines, with mesial pair stronger and longer than lateral pair.

Material examined

MADAGASCAR • 1 hermaphrodite; southern Madagascar ; 25°26.4′ S, 44°56.1′ E; depth 14–18 m; 29 May 2010; MNHN exped.; Atimo-Vatae; Stn. BS03; GenBank MW798243 ; MNHN-IU-2010-4898 .

Remarks

Although the lateral flagella of the two antennules in the single studied specimen of L. lipkei from Madagascar are broken, all other morphological characters, as well as molecular data, are consistent with the description and variability provided by Okuno & Fiedler (2010), except for one character – the number of accessory spinules on the flexor margin of the biunguiculate dactyli of the last three pereiopods. In the original description, there are three accessory spinules decreasing in size proximally, while only two accessory spinules are seen in the material of the present study. This single difference can be interpreted as inter-population variation, as specimens of Japan and Madagascar are very close genetically.

Distribution

This is the seventh record of L. lipkei . After being originally described from Japan by Okuno & Fiedler (2010), reported again from Japan by De Grave et al. (2012), and subsequently reported from Singapore by Anker & De Grave (2016); this species, based on morphological and genetic data, was recorded from the south-western Atlantic Ocean, Brazil, and classified as alien there by Alves et al. (2018) as well two other records from Brazil ( Pachelle et al. 2016, 2020). The present report on L. lipkei from Madagascar significantly extends its known Indo-West Pacific range to the south-west Indian Ocean.

Figures

Fig. 8. Color pattern of the live ovigerous hermaphrodite, Lysmata lipkei Okuno & Fiedler, 2010. Photo by Tin-Yam Chan & Chia-Wei Lin. Copyright MNHN.