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Two new species of the ground beetle subgenus Sadonebria Ledoux & Roux, 2005 (Coleoptera, Carabidae, Nebria) from Japan and first description of larvae of the subgenus.

Sasakawa K - Zookeys (2016)

Bottom Line: Both new species are distinguished by morphological (the shape of the endophallus) and morphometric (geometric morphometrics of the pronotum and aedeagus) features.For Nebria yatsugatakensis, the morphology of all larval instars is described based on specimens reared from eggs laid by collected adults.These results, together with previous studies of the species-level taxonomy of Sadonebria and larval morphology of other Nebria subgenera, suggest (i) the utility of geometric morphometrics in species-level taxonomy; (ii) the importance of larval secondary setae in the subgeneric taxonomy of the genus Nebria; and (iii) the presence of further cryptic species in Sadonebria.

View Article: PubMed Central - HTML - PubMed

Affiliation: Laboratory of Zoology, Department of Science Education, Faculty of Education, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.

ABSTRACT
Sadonebria Ledoux & Roux, 2005 is one of the more diverse subgenera of the genus Nebria Latreille, 1802 in East Asia, and its taxonomy remains unrevised at the subgeneric and specific levels. In this paper, two new species of this subgenus are described from Japan. Nebria quinquelobata sp. n. is described from Mt. Myôkô and is externally similar to Nebria saeviens Bates, 1883, to which specimens of this new species previously had been assigned. Nebria yatsugatakensis sp. n. is described from the Yatsugatake Mountains and is externally similar to locally adjacent species that had been recognized as Nebria sadona Bates, 1883 and were recently revealed as separate species. Both new species are distinguished by morphological (the shape of the endophallus) and morphometric (geometric morphometrics of the pronotum and aedeagus) features. For Nebria yatsugatakensis, the morphology of all larval instars is described based on specimens reared from eggs laid by collected adults. These results, together with previous studies of the species-level taxonomy of Sadonebria and larval morphology of other Nebria subgenera, suggest (i) the utility of geometric morphometrics in species-level taxonomy; (ii) the importance of larval secondary setae in the subgeneric taxonomy of the genus Nebria; and (iii) the presence of further cryptic species in Sadonebria.

No MeSH data available.


The distribution of Nebria (Sadonebria) spp. in the Japanese Archipelago; Nebriachinensis Bates, which is distantly related to the remaining species, and samples that are not identified by genital morphology are not included [modified from Sasakawa and Toki (2011)]. 1Nebriasadonasadona Bates 2Nebriasaeviens Bates 3Nebriaasahina Sasakawa 4Nebrianasuensis Sasakawa 5Nebriasadonaleechi Bates 6Nebriaquinquelobata sp. n. 7Nebriachichibuensis Sasakawa 8Nebriayatsugatakensis sp. n. 9Nebriakiso Sasakawa 10Nebriamikawa Sasakawa 11Nebriasadonaohdaiensis Nakane 12Nebriatenuicaulis Sasakawa & Kubota 13Nebriajakuchisana Sasakawa 14Nebriashikokuensis Sasakawa; 15: Nebriatrifida Sasakawa.
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Figure 1: The distribution of Nebria (Sadonebria) spp. in the Japanese Archipelago; Nebriachinensis Bates, which is distantly related to the remaining species, and samples that are not identified by genital morphology are not included [modified from Sasakawa and Toki (2011)]. 1Nebriasadonasadona Bates 2Nebriasaeviens Bates 3Nebriaasahina Sasakawa 4Nebrianasuensis Sasakawa 5Nebriasadonaleechi Bates 6Nebriaquinquelobata sp. n. 7Nebriachichibuensis Sasakawa 8Nebriayatsugatakensis sp. n. 9Nebriakiso Sasakawa 10Nebriamikawa Sasakawa 11Nebriasadonaohdaiensis Nakane 12Nebriatenuicaulis Sasakawa & Kubota 13Nebriajakuchisana Sasakawa 14Nebriashikokuensis Sasakawa; 15: Nebriatrifida Sasakawa.

Mentions: Sadonebria Ledoux & Roux, 2005 is an endemic East Asian subgenus of the genus Nebria Latreille, 1802 (Coleoptera, Carabidae). To date, 15 species-group taxa (13 species and two subspecies) have been described in this subgenus. Among the 15 taxa, Nebriachinensis Bates, 1872, which has developed hind wings, is widely distributed in China, Korea, and Japan (Farkač and Janata 2003). The remaining taxa, which have atrophied hind wings and are flightless, are endemic to Taiwan (Nebrianiitakana Kano, 1930) and Japan (the remaining 13 taxa). Of the 13 Japanese taxa, nine were previously considered Nebriasadona Bates, 1883 due to marked similarities in external morphology but were recently separated based on the shape of the endophallus (a membranous inner sac everted from the aedeagus of male genitalia) (Sasakawa and Kubota 2006; Sasakawa 2008, 2009, 2010; Sasakawa and Toki 2011), a character that had been insufficiently examined by previous authors (e.g., Habu 1962; Uéno 1985). According to the latest comprehensive study by Sasakawa and Toki (2011), a major diversification of Sadonebria in the Japanese Archipelago occurred in the area east of Kinki, Honshu, where the species diversity of this group is highest (Fig. 1). However, taxonomic studies of Sadonebria in this area are still insufficient, and there are many localities from which no specimens have been examined. Moreover, the recent studies were predominantly based on comparative morphology of the single male genital character, and other morphological and genetic characters remain unexamined. It is important to address these issues to better understand the diversification of Sadonebria in the Japanese Archipelago.


Two new species of the ground beetle subgenus Sadonebria Ledoux & Roux, 2005 (Coleoptera, Carabidae, Nebria) from Japan and first description of larvae of the subgenus.

Sasakawa K - Zookeys (2016)

The distribution of Nebria (Sadonebria) spp. in the Japanese Archipelago; Nebriachinensis Bates, which is distantly related to the remaining species, and samples that are not identified by genital morphology are not included [modified from Sasakawa and Toki (2011)]. 1Nebriasadonasadona Bates 2Nebriasaeviens Bates 3Nebriaasahina Sasakawa 4Nebrianasuensis Sasakawa 5Nebriasadonaleechi Bates 6Nebriaquinquelobata sp. n. 7Nebriachichibuensis Sasakawa 8Nebriayatsugatakensis sp. n. 9Nebriakiso Sasakawa 10Nebriamikawa Sasakawa 11Nebriasadonaohdaiensis Nakane 12Nebriatenuicaulis Sasakawa & Kubota 13Nebriajakuchisana Sasakawa 14Nebriashikokuensis Sasakawa; 15: Nebriatrifida Sasakawa.
© Copyright Policy - creative-commons-attribution
Related In: Results  -  Collection

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Show All Figures
getmorefigures.php?uid=PMC4829962&req=5

Figure 1: The distribution of Nebria (Sadonebria) spp. in the Japanese Archipelago; Nebriachinensis Bates, which is distantly related to the remaining species, and samples that are not identified by genital morphology are not included [modified from Sasakawa and Toki (2011)]. 1Nebriasadonasadona Bates 2Nebriasaeviens Bates 3Nebriaasahina Sasakawa 4Nebrianasuensis Sasakawa 5Nebriasadonaleechi Bates 6Nebriaquinquelobata sp. n. 7Nebriachichibuensis Sasakawa 8Nebriayatsugatakensis sp. n. 9Nebriakiso Sasakawa 10Nebriamikawa Sasakawa 11Nebriasadonaohdaiensis Nakane 12Nebriatenuicaulis Sasakawa & Kubota 13Nebriajakuchisana Sasakawa 14Nebriashikokuensis Sasakawa; 15: Nebriatrifida Sasakawa.
Mentions: Sadonebria Ledoux & Roux, 2005 is an endemic East Asian subgenus of the genus Nebria Latreille, 1802 (Coleoptera, Carabidae). To date, 15 species-group taxa (13 species and two subspecies) have been described in this subgenus. Among the 15 taxa, Nebriachinensis Bates, 1872, which has developed hind wings, is widely distributed in China, Korea, and Japan (Farkač and Janata 2003). The remaining taxa, which have atrophied hind wings and are flightless, are endemic to Taiwan (Nebrianiitakana Kano, 1930) and Japan (the remaining 13 taxa). Of the 13 Japanese taxa, nine were previously considered Nebriasadona Bates, 1883 due to marked similarities in external morphology but were recently separated based on the shape of the endophallus (a membranous inner sac everted from the aedeagus of male genitalia) (Sasakawa and Kubota 2006; Sasakawa 2008, 2009, 2010; Sasakawa and Toki 2011), a character that had been insufficiently examined by previous authors (e.g., Habu 1962; Uéno 1985). According to the latest comprehensive study by Sasakawa and Toki (2011), a major diversification of Sadonebria in the Japanese Archipelago occurred in the area east of Kinki, Honshu, where the species diversity of this group is highest (Fig. 1). However, taxonomic studies of Sadonebria in this area are still insufficient, and there are many localities from which no specimens have been examined. Moreover, the recent studies were predominantly based on comparative morphology of the single male genital character, and other morphological and genetic characters remain unexamined. It is important to address these issues to better understand the diversification of Sadonebria in the Japanese Archipelago.

Bottom Line: Both new species are distinguished by morphological (the shape of the endophallus) and morphometric (geometric morphometrics of the pronotum and aedeagus) features.For Nebria yatsugatakensis, the morphology of all larval instars is described based on specimens reared from eggs laid by collected adults.These results, together with previous studies of the species-level taxonomy of Sadonebria and larval morphology of other Nebria subgenera, suggest (i) the utility of geometric morphometrics in species-level taxonomy; (ii) the importance of larval secondary setae in the subgeneric taxonomy of the genus Nebria; and (iii) the presence of further cryptic species in Sadonebria.

View Article: PubMed Central - HTML - PubMed

Affiliation: Laboratory of Zoology, Department of Science Education, Faculty of Education, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.

ABSTRACT
Sadonebria Ledoux & Roux, 2005 is one of the more diverse subgenera of the genus Nebria Latreille, 1802 in East Asia, and its taxonomy remains unrevised at the subgeneric and specific levels. In this paper, two new species of this subgenus are described from Japan. Nebria quinquelobata sp. n. is described from Mt. Myôkô and is externally similar to Nebria saeviens Bates, 1883, to which specimens of this new species previously had been assigned. Nebria yatsugatakensis sp. n. is described from the Yatsugatake Mountains and is externally similar to locally adjacent species that had been recognized as Nebria sadona Bates, 1883 and were recently revealed as separate species. Both new species are distinguished by morphological (the shape of the endophallus) and morphometric (geometric morphometrics of the pronotum and aedeagus) features. For Nebria yatsugatakensis, the morphology of all larval instars is described based on specimens reared from eggs laid by collected adults. These results, together with previous studies of the species-level taxonomy of Sadonebria and larval morphology of other Nebria subgenera, suggest (i) the utility of geometric morphometrics in species-level taxonomy; (ii) the importance of larval secondary setae in the subgeneric taxonomy of the genus Nebria; and (iii) the presence of further cryptic species in Sadonebria.

No MeSH data available.