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An unexpected clade of South American ground beetles (Coleoptera, Carabidae, Bembidion).

Maddison DR - Zookeys (2014)

Bottom Line: Redefined subgenera within the complex are each well-supported as monophyletic.Most striking was the discovery that a small set of morphologically and ecologically heterogeneous species formed a clade, here called subgenus Nothonepha.A revised classification is proposed for the Antiperyphanes Complex.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Integrative Biology, Oregon State University, Corvallis, OR 97331, USA.

ABSTRACT
Phylogenetic relationships of the Antiperyphanes Complex of the genus Bembidion are inferred using DNA sequences from seven genes (two nuclear ribosomal, four nuclear protein coding, and one mitochondrial protein coding). Redefined subgenera within the complex are each well-supported as monophyletic. Most striking was the discovery that a small set of morphologically and ecologically heterogeneous species formed a clade, here called subgenus Nothonepha. This unexpected result was corroborated by the discovery of deep pits in the lateral body wall (in the mesepisternum) of all Nothonepha, a trait unique within Bembidion. These pits are filled with a waxy substance in ethanol-preserved specimens. In one newly discovered species (Bembidion tetrapholeon sp. n., described here), these pits are so deep that their projections into the body cavity from the two sides touch each other internally. These structures in Bembidion (Nothonepha) are compared to very similar mesepisternal pits which have convergently evolved in two other groups of carabid beetles. The function of these thoracic pits is unknown. Most members of subgenus Nothonepha have in addition similar but smaller pits in the abdomen. A revised classification is proposed for the Antiperyphanes Complex.

No MeSH data available.


Related in: MedlinePlus

Mesothorax, dorsal surface and soft tissue removed. msst: mesosternum; msepst: mesepisternum; msep: mesepimeron. Scale bar 0.1 mm. (A, C and E) Bembidion (Nothonepha) tetrapholeon, DRM voucher V100766 B, D, and FBembidion (Antiperyphanes) zanettii, DRM voucher V100767 A, B oblique ventral view; view from lower left side, slightly in front of mesothorax. C, D oblique dorsal view; view from upper right side, slightly behind the mesothorax. E, F anterior view.
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Figure 10: Mesothorax, dorsal surface and soft tissue removed. msst: mesosternum; msepst: mesepisternum; msep: mesepimeron. Scale bar 0.1 mm. (A, C and E) Bembidion (Nothonepha) tetrapholeon, DRM voucher V100766 B, D, and FBembidion (Antiperyphanes) zanettii, DRM voucher V100767 A, B oblique ventral view; view from lower left side, slightly in front of mesothorax. C, D oblique dorsal view; view from upper right side, slightly behind the mesothorax. E, F anterior view.

Mentions: In Bembidion tetrapholeon these paired structures, one on either side, internally manifest as large intrusions which touch in the center of the body cavity (Figs 10A, C, E). Typical Bembidion have no such structures internally (Figs 10B, D, F). There is variation within Nothonepha in the size of the intrusions, with Bembidion engelhardti having relatively small intrusions (and thus relatively shallow pits) (Fig. 11).


An unexpected clade of South American ground beetles (Coleoptera, Carabidae, Bembidion).

Maddison DR - Zookeys (2014)

Mesothorax, dorsal surface and soft tissue removed. msst: mesosternum; msepst: mesepisternum; msep: mesepimeron. Scale bar 0.1 mm. (A, C and E) Bembidion (Nothonepha) tetrapholeon, DRM voucher V100766 B, D, and FBembidion (Antiperyphanes) zanettii, DRM voucher V100767 A, B oblique ventral view; view from lower left side, slightly in front of mesothorax. C, D oblique dorsal view; view from upper right side, slightly behind the mesothorax. E, F anterior view.
© Copyright Policy - creative-commons-attribution
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4109512&req=5

Figure 10: Mesothorax, dorsal surface and soft tissue removed. msst: mesosternum; msepst: mesepisternum; msep: mesepimeron. Scale bar 0.1 mm. (A, C and E) Bembidion (Nothonepha) tetrapholeon, DRM voucher V100766 B, D, and FBembidion (Antiperyphanes) zanettii, DRM voucher V100767 A, B oblique ventral view; view from lower left side, slightly in front of mesothorax. C, D oblique dorsal view; view from upper right side, slightly behind the mesothorax. E, F anterior view.
Mentions: In Bembidion tetrapholeon these paired structures, one on either side, internally manifest as large intrusions which touch in the center of the body cavity (Figs 10A, C, E). Typical Bembidion have no such structures internally (Figs 10B, D, F). There is variation within Nothonepha in the size of the intrusions, with Bembidion engelhardti having relatively small intrusions (and thus relatively shallow pits) (Fig. 11).

Bottom Line: Redefined subgenera within the complex are each well-supported as monophyletic.Most striking was the discovery that a small set of morphologically and ecologically heterogeneous species formed a clade, here called subgenus Nothonepha.A revised classification is proposed for the Antiperyphanes Complex.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Integrative Biology, Oregon State University, Corvallis, OR 97331, USA.

ABSTRACT
Phylogenetic relationships of the Antiperyphanes Complex of the genus Bembidion are inferred using DNA sequences from seven genes (two nuclear ribosomal, four nuclear protein coding, and one mitochondrial protein coding). Redefined subgenera within the complex are each well-supported as monophyletic. Most striking was the discovery that a small set of morphologically and ecologically heterogeneous species formed a clade, here called subgenus Nothonepha. This unexpected result was corroborated by the discovery of deep pits in the lateral body wall (in the mesepisternum) of all Nothonepha, a trait unique within Bembidion. These pits are filled with a waxy substance in ethanol-preserved specimens. In one newly discovered species (Bembidion tetrapholeon sp. n., described here), these pits are so deep that their projections into the body cavity from the two sides touch each other internally. These structures in Bembidion (Nothonepha) are compared to very similar mesepisternal pits which have convergently evolved in two other groups of carabid beetles. The function of these thoracic pits is unknown. Most members of subgenus Nothonepha have in addition similar but smaller pits in the abdomen. A revised classification is proposed for the Antiperyphanes Complex.

No MeSH data available.


Related in: MedlinePlus