Limits...
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

Ventral surface of anterior end of abdomen and posterior region of metathorax. The second and third abdominal segments are marked by II and III. ABembidion tetrapholeon, DRM voucher V100773. BBembidium mandibulare, DRM voucher V100772 CBembidion sp. nr. lonae, DRM voucher V100771 DBembidion lonae, DRM voucher V100770. Scale bar 0.1 mm.
© Copyright Policy - creative-commons-attribution
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4109512&req=5

Figure 13: Ventral surface of anterior end of abdomen and posterior region of metathorax. The second and third abdominal segments are marked by II and III. ABembidion tetrapholeon, DRM voucher V100773. BBembidium mandibulare, DRM voucher V100772 CBembidion sp. nr. lonae, DRM voucher V100771 DBembidion lonae, DRM voucher V100770. Scale bar 0.1 mm.

Mentions: Abdominal pits. In additional to mesepisternal pits, Bembidion tetrapholeon has a prominent pit on each side of the abdomen, ventrally, between abdominal segments II and III (Fig. 13A). In ethanol-preserved specimens, this pit is filled with a waxy substance similar to that in the mesepisternal pits. Almost all other species of subgenus Nothonepha have similar pits (e.g., Bembidion (Nothonepha) sp. nr. lonae, Fig. 13C); they are lacking only in Bembidion (Nothonepha) lonae (Fig. 13D), the sister to Bembidion sp. nr. lonae.


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

Maddison DR - Zookeys (2014)

Ventral surface of anterior end of abdomen and posterior region of metathorax. The second and third abdominal segments are marked by II and III. ABembidion tetrapholeon, DRM voucher V100773. BBembidium mandibulare, DRM voucher V100772 CBembidion sp. nr. lonae, DRM voucher V100771 DBembidion lonae, DRM voucher V100770. Scale bar 0.1 mm.
© Copyright Policy - creative-commons-attribution
Related In: Results  -  Collection

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

Figure 13: Ventral surface of anterior end of abdomen and posterior region of metathorax. The second and third abdominal segments are marked by II and III. ABembidion tetrapholeon, DRM voucher V100773. BBembidium mandibulare, DRM voucher V100772 CBembidion sp. nr. lonae, DRM voucher V100771 DBembidion lonae, DRM voucher V100770. Scale bar 0.1 mm.
Mentions: Abdominal pits. In additional to mesepisternal pits, Bembidion tetrapholeon has a prominent pit on each side of the abdomen, ventrally, between abdominal segments II and III (Fig. 13A). In ethanol-preserved specimens, this pit is filled with a waxy substance similar to that in the mesepisternal pits. Almost all other species of subgenus Nothonepha have similar pits (e.g., Bembidion (Nothonepha) sp. nr. lonae, Fig. 13C); they are lacking only in Bembidion (Nothonepha) lonae (Fig. 13D), the sister to Bembidion sp. nr. lonae.

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