New record of Thor hainanensis Xu & Li, 2014 and taxonomical remarks on Lysmata ternatensis de Man, 1902 (Decapoda: Thoridae & Lysmatidae) from the Lakshadweep Islands, India

Abstract

The present study reports the new record of Thor hainanensis Xu & Li, 2014, on the basis of material from Agatti Islands in the Lakshadweep, India. This species was recently described from Hainan Island, China. Relationship of this species to two closely related species (T. paschalis and T. amboinensis) is discussed in this manuscript. Similarly, the present study also reports the rediscovery of other species, Lysmata ternatensis De Man, 1902 from the Lakshadweep waters with detailed taxonomic description. The present specimens were found to occur in the intertidal region in small crevices and rocks at a depth of 0.5-2.0 m. Genetic analysis using the mitochondrial COI sequences for both the species reveals close agreement for the morphological identification and showed the significant variation from the closely related species.

Refining southwestern Atlantic peppermint shrimp biodiversity: description of a new species ofLysmata(Decapoda: Lysmatidae) using an integrative systematic approach

“…Five species of the long-branch group can be readily distinguished from L. elisa n. sp. by the number of fused (11–25), free articles (2–5) and/or the ratio between length of free and fused portion of the dorsolateral antennular flagellum (0.05–0.21): L. argentopunctata (13–15 fused and 13–17 free, ratio 0.5; Wicksten, 2000; Anker et al ., 2009), L. moorei (8–13 fused and 7–16 free, no data on ratio; Rathbun, 1901; Pachelle et al ., 2020), L. napoleoni (6–9 fused and 10–13 free, ratio 1.1–2.2; De Grave and Anker, 2018), L. seticaudata (20–38 fused and 8–15 free, ratio 0.5–0.6; Dohrn and Holthuis, 1950), L. ternatensis (no data on fused and 10–18 free, no data on ratio; Chace, 1997; Madhavan et al ., 2019) and L. trisetacea (no data on fused and 7–10 free, no data on ratio; Chace, 1997; Wicksten, 2000).…”

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

“…Importantly, as discussed by De Grave & Anker (2018), and according to personal observations by one of the authors (HA) on other congeners, i.e., L. vittata and L. kuekenthali, characters like the rostral armament, second pereiopod carpal segmentation, and carpal and meral spinulation on three last pereiopods, especially the third one, can be highly variable within a species and consequently untrustworthy for separating taxa. However, based on the original description (De Man 1902) and other published reports on L. ternatensis (e.g., Chace 1997;Xu & Li 2015;Madhavan et al 2019), the accessory ramus of the lateral antennular flagellum in L. ternatensis consists of 10 segments (10 to 15 segments were reported for material from the China Sea by Xu & Li in 2015), thus their distinctly higher number clearly distinguishes L. ternatensis from L. malagasy sp. nov.…”