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A new interpretation of the bee fossil Melitta willardi Cockerell (Hymenoptera, Melittidae) based on geometric morphometrics of the wing.

Dewulf A, De Meulemeester T, Dehon M, Engel MS, Michez D - Zookeys (2014)

Bottom Line: Instead, the species exhibits phenotypic affinity with the subfamily Andreninae (Anthophila, Andrenidae), but does not appear to belong to any of the known genera therein.Accordingly, we describe a new genus, Andrenopteryx gen. n., based on wing shape as well as additional morphological features and to accommodate M. willardi.The new combination Andrenopteryx willardi (Cockerell) is established.

View Article: PubMed Central - HTML - PubMed

Affiliation: University of Mons, Research Institute of Biosciences, Laboratory of Zoology, Place du parc 20, 7000 Mons, Belgium.

ABSTRACT
Although bees are one of the major lineages of pollinators and are today quite diverse, few well-preserved fossils are available from which to establish the tempo of their diversification/extinction since the Early Cretaceous. Here we present a reassessment of the taxonomic affinities of Melitta willardiCockerell 1909, preserved as a compression fossil from the Florissant shales of Colorado, USA. Based on geometric morphometric wing shape analyses M. willardi cannot be confidently assigned to the genus Melitta Kirby (Anthophila, Melittidae). Instead, the species exhibits phenotypic affinity with the subfamily Andreninae (Anthophila, Andrenidae), but does not appear to belong to any of the known genera therein. Accordingly, we describe a new genus, Andrenopteryx gen. n., based on wing shape as well as additional morphological features and to accommodate M. willardi. The new combination Andrenopteryx willardi (Cockerell) is established.

No MeSH data available.


Distribution of extant examined andrenid (36 specimens) and the eight landmark configurations of Andrenopteryx willardi (*), along the first two PC axis (PC1 = 72%, PC2 = 11%).
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Figure 3: Distribution of extant examined andrenid (36 specimens) and the eight landmark configurations of Andrenopteryx willardi (*), along the first two PC axis (PC1 = 72%, PC2 = 11%).

Mentions: All of the 109 specimens of Melitta were correctly classified to their original taxon (Melittinae) in the leave-one-out cross-validation procedure. However, the eight landmark configurations of Melitta willardi are assigned to Andreninae (MDs = 2.72 – 4.84; PPs = 0.9999 – 1). Taxonomic affinities of the fossil were also assessed based on non-supervised analyses within Andrenidae. In the morphometric space defined by the PCA, the fossil is undoubtedly clustered with the subfamily Andreninae (Figure 3).


A new interpretation of the bee fossil Melitta willardi Cockerell (Hymenoptera, Melittidae) based on geometric morphometrics of the wing.

Dewulf A, De Meulemeester T, Dehon M, Engel MS, Michez D - Zookeys (2014)

Distribution of extant examined andrenid (36 specimens) and the eight landmark configurations of Andrenopteryx willardi (*), along the first two PC axis (PC1 = 72%, PC2 = 11%).
© Copyright Policy - creative-commons-attribution
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3974431&req=5

Figure 3: Distribution of extant examined andrenid (36 specimens) and the eight landmark configurations of Andrenopteryx willardi (*), along the first two PC axis (PC1 = 72%, PC2 = 11%).
Mentions: All of the 109 specimens of Melitta were correctly classified to their original taxon (Melittinae) in the leave-one-out cross-validation procedure. However, the eight landmark configurations of Melitta willardi are assigned to Andreninae (MDs = 2.72 – 4.84; PPs = 0.9999 – 1). Taxonomic affinities of the fossil were also assessed based on non-supervised analyses within Andrenidae. In the morphometric space defined by the PCA, the fossil is undoubtedly clustered with the subfamily Andreninae (Figure 3).

Bottom Line: Instead, the species exhibits phenotypic affinity with the subfamily Andreninae (Anthophila, Andrenidae), but does not appear to belong to any of the known genera therein.Accordingly, we describe a new genus, Andrenopteryx gen. n., based on wing shape as well as additional morphological features and to accommodate M. willardi.The new combination Andrenopteryx willardi (Cockerell) is established.

View Article: PubMed Central - HTML - PubMed

Affiliation: University of Mons, Research Institute of Biosciences, Laboratory of Zoology, Place du parc 20, 7000 Mons, Belgium.

ABSTRACT
Although bees are one of the major lineages of pollinators and are today quite diverse, few well-preserved fossils are available from which to establish the tempo of their diversification/extinction since the Early Cretaceous. Here we present a reassessment of the taxonomic affinities of Melitta willardiCockerell 1909, preserved as a compression fossil from the Florissant shales of Colorado, USA. Based on geometric morphometric wing shape analyses M. willardi cannot be confidently assigned to the genus Melitta Kirby (Anthophila, Melittidae). Instead, the species exhibits phenotypic affinity with the subfamily Andreninae (Anthophila, Andrenidae), but does not appear to belong to any of the known genera therein. Accordingly, we describe a new genus, Andrenopteryx gen. n., based on wing shape as well as additional morphological features and to accommodate M. willardi. The new combination Andrenopteryx willardi (Cockerell) is established.

No MeSH data available.