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A taxonomic monograph of Nearctic Scolytus Geoffroy (Coleoptera, Curculionidae, Scolytinae).

Smith SM, Cognato AI - Zookeys (2014)

Bottom Line: Parsimony analyses of molecular and combined datasets provided mixed results while Bayesian analysis recovered most nodes with posterior probabilities >90%.Two species were reinstated: Scolytusfiskei Blackman, 1934 and Scolytussilvaticus Bright, 1972.A diagnosis, description, distribution, host records and images were provided for each species and a key is presented to all species.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Entomology, Michigan State University, Natural Science Building, room 243, 288 Farm Lane, East Lansing, MI 48824, United States of America.

ABSTRACT
The Nearctic bark beetle genus Scolytus Geoffroy was revised based in part on a molecular and morphological phylogeny. Monophyly of the native species was tested using mitochondrial (COI) and nuclear (28S, CAD, ArgK) genes and 43 morphological characters in parsimony and Bayesian phylogenetic analyses. Parsimony analyses of molecular and combined datasets provided mixed results while Bayesian analysis recovered most nodes with posterior probabilities >90%. Native hardwood- and conifer-feeding Scolytus species were recovered as paraphyletic. Native Nearctic species were recovered as paraphyletic with hardwood-feeding species sister to Palearctic hardwood-feeding species rather than to native conifer-feeding species. The Nearctic conifer-feeding species were monophyletic. Twenty-five species were recognized. Four new synonyms were discovered: Scolytuspraeceps LeConte, 1868 (= Scolytusabietis Blackman, 1934; = Scolytusopacus Blackman, 1934), Scolytusreflexus Blackman, 1934 (= Scolytusvirgatus Bright, 1972; = Scolytuswickhami Blackman, 1934). Two species were reinstated: Scolytusfiskei Blackman, 1934 and Scolytussilvaticus Bright, 1972. A diagnosis, description, distribution, host records and images were provided for each species and a key is presented to all species.

No MeSH data available.


Frons: A distinctly, moderately longitudinally aciculate, weakly punctate (Scolytussubscaber) B indistinctly, weakly longitudinally aciculate, strongly punctate (Scolytusventralis).
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Figure 68: Frons: A distinctly, moderately longitudinally aciculate, weakly punctate (Scolytussubscaber) B indistinctly, weakly longitudinally aciculate, strongly punctate (Scolytusventralis).

Mentions: This is the first key to both sexes of Nearctic Scolytus adults. Unlike previous keys (e.g. Edson 1967; Wood 1982) apriori knowledge of the gender is not required. Only one sex is necessary to identify the specimen and host species or gallery types are not needed. Because the sexual dimorphic characters are not consistent for the Nearctic species (see sexual dimorphism discussion above), the sexes could not be evenly split. In general, males and females of native hardwood-feeding species will key out beginning at couplet 3 and both sexes of some Abies feeding species beginning at couplet 23. The key lists the gender of the identified specimen. If no gender is specified, the identification applies to both sexes. The length of frons setae is measured relative to the width of the midpoint of the eye.


A taxonomic monograph of Nearctic Scolytus Geoffroy (Coleoptera, Curculionidae, Scolytinae).

Smith SM, Cognato AI - Zookeys (2014)

Frons: A distinctly, moderately longitudinally aciculate, weakly punctate (Scolytussubscaber) B indistinctly, weakly longitudinally aciculate, strongly punctate (Scolytusventralis).
© Copyright Policy - creative-commons-attribution
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4233402&req=5

Figure 68: Frons: A distinctly, moderately longitudinally aciculate, weakly punctate (Scolytussubscaber) B indistinctly, weakly longitudinally aciculate, strongly punctate (Scolytusventralis).
Mentions: This is the first key to both sexes of Nearctic Scolytus adults. Unlike previous keys (e.g. Edson 1967; Wood 1982) apriori knowledge of the gender is not required. Only one sex is necessary to identify the specimen and host species or gallery types are not needed. Because the sexual dimorphic characters are not consistent for the Nearctic species (see sexual dimorphism discussion above), the sexes could not be evenly split. In general, males and females of native hardwood-feeding species will key out beginning at couplet 3 and both sexes of some Abies feeding species beginning at couplet 23. The key lists the gender of the identified specimen. If no gender is specified, the identification applies to both sexes. The length of frons setae is measured relative to the width of the midpoint of the eye.

Bottom Line: Parsimony analyses of molecular and combined datasets provided mixed results while Bayesian analysis recovered most nodes with posterior probabilities >90%.Two species were reinstated: Scolytusfiskei Blackman, 1934 and Scolytussilvaticus Bright, 1972.A diagnosis, description, distribution, host records and images were provided for each species and a key is presented to all species.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Entomology, Michigan State University, Natural Science Building, room 243, 288 Farm Lane, East Lansing, MI 48824, United States of America.

ABSTRACT
The Nearctic bark beetle genus Scolytus Geoffroy was revised based in part on a molecular and morphological phylogeny. Monophyly of the native species was tested using mitochondrial (COI) and nuclear (28S, CAD, ArgK) genes and 43 morphological characters in parsimony and Bayesian phylogenetic analyses. Parsimony analyses of molecular and combined datasets provided mixed results while Bayesian analysis recovered most nodes with posterior probabilities >90%. Native hardwood- and conifer-feeding Scolytus species were recovered as paraphyletic. Native Nearctic species were recovered as paraphyletic with hardwood-feeding species sister to Palearctic hardwood-feeding species rather than to native conifer-feeding species. The Nearctic conifer-feeding species were monophyletic. Twenty-five species were recognized. Four new synonyms were discovered: Scolytuspraeceps LeConte, 1868 (= Scolytusabietis Blackman, 1934; = Scolytusopacus Blackman, 1934), Scolytusreflexus Blackman, 1934 (= Scolytusvirgatus Bright, 1972; = Scolytuswickhami Blackman, 1934). Two species were reinstated: Scolytusfiskei Blackman, 1934 and Scolytussilvaticus Bright, 1972. A diagnosis, description, distribution, host records and images were provided for each species and a key is presented to all species.

No MeSH data available.