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
Abstract:The present study focuses on shrimps belonging to the genus Lysmata Risso, 1816, collected from Madagascar during the Atimo Vatae expedition carried out in 2010. Lysmata malagasy sp. nov. is a new species belonging to the clade named “long accessory ramous” or “cosmopolitan” in previous phylogenetic studies. The new species can be distinguished from the only two other representatives of this group in the Indo-west Pacific, L. ternatensis De Man, 1902, and L. trisetacea (Heller, 1861), by the accessory ramus of… Show more
“…The DNA substitution model was the GTR + I + G. BI ( −lnL = 8681.40 for run 1; −lnL = 8679.75 for run 2) and ML ( −lnL = 7679.99) analyses provided congruent tree topologies (Figure 2), dividing Lysmata species worldwide, except L. olavoi , in three major groups (A, E, F). The clade A (posterior probability values, pp = 0.98; bootstrap values, bs = 96) accounts for the ‘unguiform accessory ramous/morpho-variable’ group (Baeza et al ., 2009 b ; Baeza, 2010; Fiedler et al ., 2010; Alves et al ., 2018; Ashrafi et al ., 2021). The clade B (pp = 0.86; bs = 82) consisted of a branch (C) in which the two sequences of L. olavoi cluster together (pp = 1; bs = 100) in a basal position with respect to the remaining Lysmata species, and by the clade D (pp = 1; bs = 98).…”
Section: Results and Taxonomic Remarksmentioning
confidence: 99%
“…The clade B (pp = 0.86; bs = 82) consisted of a branch (C) in which the two sequences of L. olavoi cluster together (pp = 1; bs = 100) in a basal position with respect to the remaining Lysmata species, and by the clade D (pp = 1; bs = 98). This latter clade is formed by the subclade E (pp = 1; bs = 85), that includes our and GenBank sequences of L. seticaudata in the ‘long accessory ramous/cosmopolitan’ group (Baeza et al ., 2009 b ; Baeza, 2010; Fiedler et al ., 2010; Alves et al ., 2018; Ashrafi et al ., 2021), and the subclade F (pp = 1; bs = 92), composed by species that previous phylogenies merge together in the ‘short accessory ramous’ group (Fiedler et al ., 2010; Ashrafi et al ., 2021) or split in two additional subclades (G: pp = 0.99; bs = 74; H: pp = 0.70; bs = 84), the ‘cleaner’ and ‘Tropical American/peppermint’ groups (Baeza et al ., 2009 b ; Baeza, 2010; Alves et al ., 2018). Fig.…”
Section: Results and Taxonomic Remarksmentioning
confidence: 99%
“…In fact, they disagree with early phylogenies, placing L. olavoi in a basal position with respect to worldwide Lysmata species (Baeza et al, 2009b;Baeza, 2010), but also with recent ones. Fiedler et al (2010) reported this taxon in a basal position with respect to the 'short accessory ramous/cleaner' group, while Alves et al (2018) and Ashrafi et al (2021) placed this species outside the 'long accessory ramous/cosmopolitan' group. In contrast, both our trees place it in a basal position with respect to three (cleaner, Tropical American/peppermint, cosmopolitan) or two (short accessory ramous and long accessory ramous) groups.…”
Section: Discussionmentioning
confidence: 99%
“…(2018) and Ashrafi et al . (2021) placed this species outside the ‘long accessory ramous/cosmopolitan’ group. In contrast, both our trees place it in a basal position with respect to three (cleaner, Tropical American/peppermint, cosmopolitan) or two (short accessory ramous and long accessory ramous) groups.…”
The genus Lysmata Risso, 1816 includes five species in the Mediterranean Sea, namely two well-known species with an Atlantic–Mediterranean distribution, L. seticaudata (Risso, 1816) and L. nilita Dohrn & Holthuis, 1950, and three additional species only known from single records. These are L. kempi Chace, 1997 and L. vittata (Stimpson, 1860), alien species native to the Indo-Pacific region, and L. olavoi Fransen, 1991, a poorly known species originally described from the Azores (Atlantic Ocean) and only reported three decades ago from the eastern parts of the basin. Based on an integrative taxonomic approach, we report the first finding of an ovigerous female of L. olavoi from Italy (Gulf of Naples, Tyrrhenian Sea) and the entire western Mediterranean, thus confirming the presence of this species in the basin and filling a wide gap in its published distribution. It is possible that this taxon was present in the Mediterranean for centuries but went overlooked or undetected due to cryptic habits, occupancy of still unexplored habitats, or misidentification with the highly similar L. seticaudata. Results of phylogenetic analyses confirm the exclusion of L. olavoi by the major lysmatid groups and underline the necessity of multilocus approaches to disentangle its correct phylogenetic position. As the species is still surrounded by a number of unsolved ecological and phylogenetic questions, further field and laboratory work is required to shed light on them.
“…The DNA substitution model was the GTR + I + G. BI ( −lnL = 8681.40 for run 1; −lnL = 8679.75 for run 2) and ML ( −lnL = 7679.99) analyses provided congruent tree topologies (Figure 2), dividing Lysmata species worldwide, except L. olavoi , in three major groups (A, E, F). The clade A (posterior probability values, pp = 0.98; bootstrap values, bs = 96) accounts for the ‘unguiform accessory ramous/morpho-variable’ group (Baeza et al ., 2009 b ; Baeza, 2010; Fiedler et al ., 2010; Alves et al ., 2018; Ashrafi et al ., 2021). The clade B (pp = 0.86; bs = 82) consisted of a branch (C) in which the two sequences of L. olavoi cluster together (pp = 1; bs = 100) in a basal position with respect to the remaining Lysmata species, and by the clade D (pp = 1; bs = 98).…”
Section: Results and Taxonomic Remarksmentioning
confidence: 99%
“…The clade B (pp = 0.86; bs = 82) consisted of a branch (C) in which the two sequences of L. olavoi cluster together (pp = 1; bs = 100) in a basal position with respect to the remaining Lysmata species, and by the clade D (pp = 1; bs = 98). This latter clade is formed by the subclade E (pp = 1; bs = 85), that includes our and GenBank sequences of L. seticaudata in the ‘long accessory ramous/cosmopolitan’ group (Baeza et al ., 2009 b ; Baeza, 2010; Fiedler et al ., 2010; Alves et al ., 2018; Ashrafi et al ., 2021), and the subclade F (pp = 1; bs = 92), composed by species that previous phylogenies merge together in the ‘short accessory ramous’ group (Fiedler et al ., 2010; Ashrafi et al ., 2021) or split in two additional subclades (G: pp = 0.99; bs = 74; H: pp = 0.70; bs = 84), the ‘cleaner’ and ‘Tropical American/peppermint’ groups (Baeza et al ., 2009 b ; Baeza, 2010; Alves et al ., 2018). Fig.…”
Section: Results and Taxonomic Remarksmentioning
confidence: 99%
“…In fact, they disagree with early phylogenies, placing L. olavoi in a basal position with respect to worldwide Lysmata species (Baeza et al, 2009b;Baeza, 2010), but also with recent ones. Fiedler et al (2010) reported this taxon in a basal position with respect to the 'short accessory ramous/cleaner' group, while Alves et al (2018) and Ashrafi et al (2021) placed this species outside the 'long accessory ramous/cosmopolitan' group. In contrast, both our trees place it in a basal position with respect to three (cleaner, Tropical American/peppermint, cosmopolitan) or two (short accessory ramous and long accessory ramous) groups.…”
Section: Discussionmentioning
confidence: 99%
“…(2018) and Ashrafi et al . (2021) placed this species outside the ‘long accessory ramous/cosmopolitan’ group. In contrast, both our trees place it in a basal position with respect to three (cleaner, Tropical American/peppermint, cosmopolitan) or two (short accessory ramous and long accessory ramous) groups.…”
The genus Lysmata Risso, 1816 includes five species in the Mediterranean Sea, namely two well-known species with an Atlantic–Mediterranean distribution, L. seticaudata (Risso, 1816) and L. nilita Dohrn & Holthuis, 1950, and three additional species only known from single records. These are L. kempi Chace, 1997 and L. vittata (Stimpson, 1860), alien species native to the Indo-Pacific region, and L. olavoi Fransen, 1991, a poorly known species originally described from the Azores (Atlantic Ocean) and only reported three decades ago from the eastern parts of the basin. Based on an integrative taxonomic approach, we report the first finding of an ovigerous female of L. olavoi from Italy (Gulf of Naples, Tyrrhenian Sea) and the entire western Mediterranean, thus confirming the presence of this species in the basin and filling a wide gap in its published distribution. It is possible that this taxon was present in the Mediterranean for centuries but went overlooked or undetected due to cryptic habits, occupancy of still unexplored habitats, or misidentification with the highly similar L. seticaudata. Results of phylogenetic analyses confirm the exclusion of L. olavoi by the major lysmatid groups and underline the necessity of multilocus approaches to disentangle its correct phylogenetic position. As the species is still surrounded by a number of unsolved ecological and phylogenetic questions, further field and laboratory work is required to shed light on them.
“…Lysmatidae Dana, 1852 is currently comprised of five genera ( Exhippolysmata Stebbing, 1915, Ligur Sarato, 1885, Lysmata Risso, 1816, Lysmatella Borradaile, 1915 and Mimocaris Nobili, 1903), of which Lysmata is the most speciose with 50 valid species (Prakash and Baeza, 2017; De Grave and Anker, 2018; Wang and Sha, 2018; Ashrafi et al ., 2021; Guéron et al ., 2022). These shrimps are widely distributed from tropical to temperate regions and exhibit a wide diversity of social systems (e.g.…”
Currently, 14 of the 50 species of Lysmata are known to possess a long accessory branch with more than two articles. Historically, Lysmata intermedia and Lysmata moorei were the only two ‘long-branch’ species inhabiting the southwestern Atlantic. Here we describe, based on morphological, molecular and colour pattern data, a new species of Lysmata possessing a long accessory branch from Pernambuco, northeastern Brazil. Our maximum-likelihood analysis recovered Lysmata elisa sp. n. as a sister species to Lysmata jundalini. Both species are closely related to Lysmata holthuisi and L. intermedia. The four aforementioned species comprise the L. intermedia species complex. The new species may be morphologically distinguished from the other closely related species by different sets of characters, which include details of the dorsolateral antennular flagellum, armature of ischium of the second pair of pereiopods, intraorbital process shape and relative proportions of pereiopods. Our results reinforce the importance of refining biodiversity data through the application of integrative taxonomic approaches to expand the knowledge of local and global biodiversity. The biodiversity of Lysmata deserves special attention, as they are intensively exploited in the aquarium trade.
Peppermint shrimp resembling Lysmata vittataStimpson, 1860, a species native to the Indo-West Pacific, were found in the lower Chesapeake Bay and adjacent coastal embayments in 2013, representing the first recorded introduction of this species in the northwestern Atlantic. Conflicting morphological descriptions, inconsistent morphological terminology, and limited molecular data (i.e., unresolved taxonomy), as well as the destruction of the type material of L. vittata, created uncertainty regarding proper identification. We provide the first phylogeny incorporating individuals from across the presumed native and introduced range of L. vittata. Morphological and phylogenetic analyses clearly indicate L. vittata represents a species complex of two widely divergent groups: 1) “Bruce Type” with a uniramous dorsal antennule that agrees with A.J. Bruce’s 1990 redescription of L. vittata, and 2) “Rauli Type” with a one-article accessory branch on the dorsal antennule that agrees most closely with the junior synonym L. rauliLaubenheimer & Rhyne, 2010. Given the taxonomic ambiguity surrounding L. vittata, we designate the individual used by A.J. Bruce to redescribe L. vittata and incorporated in our analyses as a neotype to fix the identity of this species. We therefore identify introduced North American and New Zealand populations as L. vittata sensu stricto and postulate that the native range spans temperate/subtropical East Asia. These data suggest that L. rauli is a valid species, which includes a possible undescribed sister species. We confirm the presence of L. californicaStimpson, 1866 in New Zealand, the first non-native record for this species. We also provide data suggesting L. disparHayashi, 2007 may be more widespread in the Indo-West Pacific than currently known and consider L. lipkeiOkuno & Fiedler, 2010 to be a likely junior synonym.
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