Euwallacea alastos
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Euwallacea alastos holotype lateral; S.M. Smith |
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Euwallacea alastos holotype dorsal; S.M. Smith |
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Euwallacea alastos holotype declivity; S.M. Smith |
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Euwallacea alastos holotype frontal; S.M. Smith |
Taxonomic history
Euwallacea alastos Smith, Beaver & Cognato 2022 (in Smith et al. 2022cSmith et al. 2022c:
Smith, SM, Beaver RA, Pham HT, Cognato AI. 2022c. New species and new records of Xyleborini from the Oriental region, Japan and Papua New Guinea (Coleoptera: Curculionidae: Scolytinae). Zootaxa. In press.): in press.
Diagnosis
3.2 mm long (n = 1); 2.56 times as long as wide. This species is distinguished by its stout form; declivitaldeclivital:
pertaining to the elytral declivity
posterolateral margin costate and granulategranulate:
pertaining to a coarse, grainy surface texture
; pronotumpronotum:
the dorsal surface of the thorax
appearing subquadratesubquadrate:
almost quadrate, with oblique corners
when viewed dorsally (type 3); protibiaeprotibia:
tibia of the first pair of legs
outer margins obliquely triangular bearing five short obtuse denticles; declivitaldeclivital:
pertaining to the elytral declivity
strial punctures approximately the same size on discdisc:
the flat central upper surface of any body part (e.g. pronotum and elytra)
and declivitydeclivity:
downward slope of either the pronotum or elytra
; declivitydeclivity:
downward slope of either the pronotum or elytra
gradually rounded; and declivitaldeclivital:
pertaining to the elytral declivity
surface opalescentopalescent:
iridescent, showing vaying colors
.
This species is very similar to E. praevius and can be distinguished by the following combination of characters (E. alastos given first): stouter form, 2.56 vs 2.72−2.92 × as long as wide; stout elytraelytron:
the two sclerotized forewings of beetles that protect and cover the flight wings
1.44 vs 1.6−1.83 × as long as wide; declivitaldeclivital:
pertaining to the elytral declivity
surface opalescentopalescent:
iridescent, showing vaying colors
vs strongly shiningshining:
appearing glossy or bright in luster; referring to a surface that is polished and reflects light well
; declivitaldeclivital:
pertaining to the elytral declivity
interstriae minutely granulategranulate:
pertaining to a coarse, grainy surface texture
vs distinctly denticulatedenticulate:
covered in denticles
.
May be confused with
Euwallacea praevius, E. andamanensis, Xyleborus aquilus
Distribution
Japan
Host plants
unknown
DNA data
specimens not available for sequencing
