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Ips plastographus plastographus
Ips plastographus plastographus, male frons
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Ips plastographus plastographus, male frons
Ips plastographus plastographus, female frons
Ips plastographus plastographus, female frons
Ips plastographus plastographus, male declivity
Ips plastographus plastographus, female declivity
Ips plastographus plastographus, male lateral habitus
Scientific Name
Ips plastographus plastographus (LeConte, 1868)
Synonyms
Common names: California pine engraver (English)
Diagnostic notes
Species:
-Has four spines on the elytral declivity and sutures of antennal club acutely angulate.
-Lacks frontal carinate elevation present in most specimens of related species I. integer (more details under I. integer).
Subspecies:
-Median tubercle of male frons usually larger that in I. plastographus maritimus.
Morphological Summary
females
Body. 4-5.2(-6.2) mm long, 2.3-2.6 times longer than wide; pronotum 1.0-1.2 times longer than wide.
Head. Epistomal margin with uniseriate row of tubercles with elongate mesal tubercle. Frons outline convex in lateral view; vestiture fine (not hiding part of integument); surface sculpture near epistoma densely tuberculate-punctate; central carina absent; central tubercle present and single, separated from base of epistomal setae by 2-4(-5) tubercle diameters, without pair of circular tubercles on either side of midline; transverse carina absent or present; frons central fovea absent; circular tubercles above top of eyes present - up to, or more than one third of all tubercles. Vertex and pronotum with stridulatory apparatus (par stridens). Antennal club sutures acutely angulate.
Prothorax. Protibiae with three socketed teeth on apical half (does not include apical spine).
Elytra. Interstriae impunctate or punctate (observed on interstriae 2 and 3 on middle third of elytral disc), punctures 0.6-0.9(-1) times diameter of adjacent strial punctures (punctures and striae measured at steepest part of puncture wall), interstrial setae shorter than width of scutellar shield, interstriae 3-5 times as wide as adjacent striae. Elytral declivity with four spines per side, spine 3 largest; spine 1 (largest on 2nd interval) closer to spine 2 than suture or suture than spine 2; spines 1 and 2 separated at base by distance greater than height of spine 1; spine 2 closer to spine 3 than spine 1; spine 3 tapered, apex acute or right-angled, with apical half symmetrical in lateral view; spines 2 and 3 on shared tumescence, not in line with spines 1 and 4 (posterodorsal view); declivital integument mat or shiny.
males
Body. 4-5.2(-6.2) mm long, 2.3-2.6 times longer than wide; pronotum 1.0-1.2 times longer than wide.
Head. Epistomal margin with uniseriate row of tubercles with elongate mesal tubercle. Frons outline convex in lateral view; vestiture fine (not hiding part of integument); surface sculpture near epistoma densely tuberculate-punctate; central carina absent; central tubercle present and single, separated from base of epistomal setae by 2-4(-5) tubercle diameters, without pair of circular tubercles on either side of midline; transverse carina absent or present; frons central fovea absent; circular tubercles above top of eyes present - up to, or more than one third of all tubercles. Vertex and pronotum without stridulatory apparatus (par stridens). Antennal club sutures acutely angulate.
Prothorax. Protibiae with three socketed teeth on apical half (does not include apical spine).
Elytra. Interstriae impunctate (observed on interstriae 2 and 3 on middle third of elytral disc), punctures 0.6-0.9(-1) times diameter of adjacent strial punctures (punctures and striae measured at steepest part of puncture wall), interstrial setae shorter than width of scutellar shield, interstriae 3-5 times as wide as adjacent striae. Elytral declivity with four spines per side, spine 3 largest; spine 1 (largest on 2nd interval) closer to spine 2 than suture or suture than spine 2; spines 1 and 2 separated at base by distance greater than height of spine 1; spine 2 closer to spine 3 than spine 1; spine 3 straight sided with tapered apex or pedunculate (capitate), apex acute or right-angled, with apical half asymmetrical in lateral view; spines 2 and 3 on shared tumescence, not in line with spines 1 and 4 (posterodorsal view); declivital integument mat or shiny.
Geographic Distribution
Species: Canada (British Columbia); USA (California, Idaho, Montana, Oregon, Washington, Wyoming).
Subpecies: Canada (British Columbia); USA (California, Idaho, Montana, Oregon, Washington, Wyoming).
Hosts
Pinus (also Picea)
Notes
I. pini, I. integer, and I. plastographus form clade (Cognato and Sun 2007).
References
Cognato, A.I. 2015. Biology, systematics, and evolution of Ips. In Bark beetles: biology and ecology of native and invasive species. Edited by F.E. Vega and R.W. Hofstetter. Elsevier, San Diego, California. Pp. 351–370.
Cognato, A.I. and Sun, J.H. 2007. DNA based cladograms augment the discovery of a new Ips species from China (Coleoptera: Curculionidae: Scolytinae). Cladistics, 23: 539–551.
EPPO. No date. Data Sheets on Quarantine Pests: Ips plastographus. European and Mediterranean Plant Protection Organization.
Wood, S.L. 1982. The bark and ambrosia beetles of North and Central America (Coleoptera: Scolytidae), a taxonomic monograph. Great Basin Naturalist Memoirs, 6: 1–1359.
Internet resources
Bark and Ambrosia Beetles - T. Atkinson
