Abstract
A new monospecific genus of the family Nannopodidae Brady, 1880 is proposed, based on specimens of both sexes of Concilicoxa hispidagen. et sp. nov. collected from subtidal sandy sediments in the Yellow Sea of South Korea. The presence of a coxal outer projection on the first to fourth legs and reduction of both rami of the second to fourth legs in this new genus show a clear relationship with a clade, which is characterised by the modified thoracopods for burrowing ability, comprising Huntemannia Poppe, 1884, Rosacletodes Wells, 1985, Laophontisochra George, 2002, Acuticoxa Huys & Kihara, 2010 and Talpacoxa Corgosinho, 2012 in Nannopodidae. Within this clade, C. hispidagen. et sp. nov. is most closely related to L. maryamae George, 2002 in having the prehensile endopod in the first leg, broad intercoxal sclerite on the second to fourth legs and the female fifth leg being composed of separate exopod and baseoendopod, but is distinguished by the absence of mandibular exopod, two-segmented mandibular endopod, presence of four setae on the distal exopodal segment of the first leg, and fusion of the intercoxal sclerite to the coxae in the third and fourth legs. These four features are considered as autapomorphies of the new genus. The possible relationship amongst members of the nannopodid clade is further discussed. Additionally, some comments on the taxonomic position of L. terueae Björnberg, 2014 are given, resulting in the transfer of the species to Acuticoxa as A. terueaecomb. nov.
Highlights
Por (1986) proposed the family Huntemanniidae Por, 1986 to accommodate six cletodid genera, Nannopus Brady, 1880, Huntemannia Poppe, 1884, Pontopolites T
Kim et al (2017) proposed the revival of the genus Ilyophilus Lilljeborg, 1902, which had been considered a junior synonym of Nannopus, based on a morphological difference in the segmentation of endopod in the third leg, i.e. Nannopus could accommodate only two species, N. palustris sensu stricto Brady (1880) and N. parvipilis Kim, Choi & Yoon, 2017, having a one-segmented endopod and the other Nannopus species with a two-segmented endopod should be transferred into Ilyophilus
Björnberg (2014) described the second species of Laophontisochra (L. terueae) from the south-eastern coast of Brazil, but provided insufficient description and illustrations. She argued that L. terueae fits the generic diagnosis of the genus as amended by Huys and Kihara (2010), despite obvious differences in the presence of endopods in P2 and P3 and in the structure of the female P5
Summary
Por (1986) proposed the family Huntemanniidae Por, 1986 to accommodate six cletodid genera, Nannopus Brady, 1880, Huntemannia Poppe, 1884, Pontopolites T. Kim et al (2017) proposed the revival of the genus Ilyophilus Lilljeborg, 1902, which had been considered a junior synonym of Nannopus, based on a morphological difference in the segmentation of endopod in the third leg, i.e. Nannopus could accommodate only two species, N. palustris sensu stricto Brady (1880) and N. parvipilis Kim, Choi & Yoon, 2017, having a one-segmented endopod and the other Nannopus species with a two-segmented endopod should be transferred into Ilyophilus. The family Nannopodidae is composed of 30 valid species distributed in eight genera, Nannopus, Huntemannia, Pontopolites, Rosacletodes, Laophontisochra, Acuticoxa, Talpacoxa and Doolia (Kim et al 2017; Vakati and Lee 2017; Karanovic and Cho 2018; Lee 2020). SORS plays an important role in monitoring ocean and meteorological changes related to global climate change We describe this new taxon and clarify its taxonomic relationship within Nannopodidae. We discuss the taxonomic position of L. terueae Björnberg, 2014
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