Phylogenetic analysis using rDNA reveals polyphyly of Oplophoridae (Decapoda:Caridea)

Abstract

Molecular phylogenetic analysis on nine of the ten genera in the caridean family Oplophoridae Dana, 1852, as well as 14 other caridean families using mitochondrial 16S and nuclear 18S rRNA genes, does not support the monophyletic status of Oplophoridae. Two disparate groups of oplophorids are revealed, with different morphological characters and ecology. It is proposed that the family Oplophoridae is restricted to the three genera Oplophorus, Systellaspis and Janicella. These three genera tend to be distributed in shallower water than the other oplophorid genera, and can also be distinguished from them by certain morphological characters. They have a thicker integument, superficial cuticular photophores and larger eyes, and the molar process of their mandibles is greatly reduced or bears a deep channel. The family Acanthephyridae Bate, 1888 is resurrected for the other seven genera, which are generally distributed in deeper water and are characterised by red soft integument, no cuticular photophores, smaller eyes and well-developed molar process of the mandibles without a deep channel. The relationships between these two families and other caridean families could not be clearly resolved in this study.

An improved taxonomic sampling is a necessary but not sufficient condition for resolving inter-families relationships in Caridean decapods

“…We also provide new supports for Bathypalaemonellidae and Oplophoridae but also for two monogeneric families Anchistioidae and Eugonatonotidae. The monophyly of Oplophoridae, that was suggested in the analysis of Bracken et al (2009) and then explored in more detail in Chan et al (2010), is here corroborated thanks to a better coverage of other Caridean families. We also confirm the results of Bracken et al (2009);Li et al (2011);Short et al (2013), recovering Palaemonidae polyphyletic and supporting the synonymizing of Kakaducarididae with Palaemonidae.…”

“…This classification is primarily based on the classification proposed by De Grave et al (2009) using a comparative morphology approach. The Carideorum Catalogus (De Grave and Fransen 2011) and recent molecular phylogenies (Page et al 2008b;Bracken et al 2010;Chan et al 2010;De Grave et al 2010, 2014Short et al 2013) provided five main modifications to the classification of De . First, the Procarididae were excluded from the Caridea and included in a distinct infraorder, the Procarididea (Bracken et al 2010).…”

“…To enhance the genetic sampling we also tested all the genetic markers used in the recent Decapoda literature and explored the public genetic databases to identify potential new markers. The main sources of markers were the recent articles on Caridea (Bracken et al 2009;Chan et al 2010;Li et al 2011;Kou et al 2013) and Decapoda phylogeny (Toon et al 2009). The taxonomic sampling follows the hierarchical scheme of the latest revisions of the classification of Decapoda (i.e.…”

Phylogenetic and transcriptomic analyses reveal the evolution of bioluminescence and light detection in marine deep-sea shrimps of the family Oplophoridae (Crustacea: Decapoda)

“…108 Oplophorid shrimp have a cosmopolitan distribution, though 109 none are found in polar regions (Chace, 1986;Chan et al, 2010). 110 Recently, Oplophoridae was split into two families, Acanthephyri-111 dae and Oplophoridae (Chan et al, 2010;De Grave and Fransen, 112 2011 Hymenodora, and Kemphyra) possess only secretory luminescence 120 and completely lack cuticular photophores (Chan et al, 2010;121 Nowel et al, 1998). Tracing the different modes of luminescence 122 through a phylogeny can be a useful means of investigating the 123 evolution of bioluminescence in oplophorid shrimp.…”

“…Coelenterazine, the only luciferin known to occur in 103 luminescent decapod crustaceans, is used in both oplophorid 104 secretory and photophore bioluminescence, though coelenterazine 105 levels in the secretion are nearly three orders of magnitude greater 106 than what is found in photophores (Shimomura et al, 1980;107 Thomson et al, 1995). 108 Oplophorid shrimp have a cosmopolitan distribution, though 109 none are found in polar regions (Chace, 1986;Chan et al, 2010). 110 Recently, Oplophoridae was split into two families, Acanthephyri-111 dae and Oplophoridae (Chan et al, 2010;De Grave and Fransen, 112 2011 Hymenodora, and Kemphyra) possess only secretory luminescence 120 and completely lack cuticular photophores (Chan et al, 2010;121 Nowel et al, 1998).…”