Gyascutus paragranulatu, Nelson, G. H., 2000

Nelson, G. H., 2000, A revision of the subtribe Hippomelanina, part II: Gyascutus (Gyascutus) LeConte (Coleoptera: Buprestidae), Journal of Natural History 34 (12), pp. 2251-2292 : 2275-2277

publication ID

https://doi.org/ 10.1080/002229300750037893

persistent identifier

https://treatment.plazi.org/id/224D878C-BD1F-D506-FEA6-FAF0FCC4FE34

treatment provided by

Felipe

scientific name

Gyascutus paragranulatu
status

 

6. Gyascutus paragranulatu s Nelson, sp. nov.

(®gures 8, 19, 24, 29, 39, 49)

Diagnosis. Coppery black in colour; male 11.3 mm long; width between eyes 1.3 Ö width of eye when viewed from above; antennae reaching middle of pronotum when laid alongside in male, female unknown; pronotum widest at posterior margin; surface of pronotal disc a mixture of large punctures and irregular smooth raised areas; elytra with three or four faintly indicated costae; male genitalia moderately elongate slender (®gure 39).

Description, holotype male. Head with width between eyes 1.3 Ö width of eye when viewed from above; front ¯at between antennal ridges, ridges concavely converging; front moderately coarsely and densely punctate with numerous smaller callosities and three longitudinal ones converging toward vertex; clothed by long, semi-erect, white hair-like setae; clypeal margin shallowly semicircularly emarginate; antennae reaching middle of pronotum when laid alongside; antennomere 1 elbowed elongate clavate, 2 short clavate, 3 elongate slightly dilated apically, strongly serrate from 4, sensilla beginning with 5, serrate portion of roundly triangular antennomeres, 11 with small apical notch (®gure 19); ratio of antennomere lengths from base: 2.6:1.0:1.6:1.6:1.4:1.4:1.2:1.2:1.0:1.0:1.2.

Pronotal width 1.5 Ö length, widest at posterior margin, narrowest at anterior margin; carinate laterally in posterior three-quarters; lateral margins weakly narrowed from behind to middle, then more strongly converging to anterior angles; anterior margin moderately bisinuate; posterior margin strongly bisinuate with emarginate median lobe; disc moderately convex, shallowly transversely impressed behind anterior margin, posteriorly ¯attened at middle and with deep depressions on either side midway to lateral margins; surface a mixture of large punctures and irregular smooth raised areas, punctures smaller and more dense anteriorly and laterally; with few inconspicuous short, semi-erect, white, hair-like setae laterally. Scutellum small transverse, surface glabrous, impunctate.

Elytra as wide as pronotum at base; lateral margins subparallel in basal onethird then weakly converging to just past middle and then more strongly converging to bidentate emarginate apices, margin with few weak serrulations toward apex; disc moderately convex, depressed along base; surface with ®nely punctate striae; intervals mostly of interrupted smooth slightly raised areas and with three or four faintly indicated costae; surface clothed with inconspicuous, short, semi-recumbent, white hair-like setae.

Ventrally ®nely densely punctate laterally, punctures shallow and somewhat alveolate on proepisternum, and somewhat scabrous on abdominal sterna, punctures sparse medially on thoracic and ®rst abdominal sterna; punctate areas moderately densely clothed with recumbent white hair-like setae that become more erect medially on thoracic sterna; prosternum with anterior margin transverse with weak lobe laterally; prosternal process expanded behind procoxal cavities then converging to bluntly rounded apex, surface with irregular punctures in midline, lateral margins sulcate; mesosternum broadly separated; metasternum with deep median sulcus; protrochanter with acute tooth; protibia slightly robust, weakly arcuate, with several small indistinct teeth (®gure 24); mesotibia slender, slightly arcuate; metatibia slen- der, straight; metatarsomere 1 longer than 2 1 3, longer than 5; last visible abdominal sternum elongate triangular, with notches along lateral margins and with weak submarginal crest, apex weakly convexly truncate, with posterolateral angles slightly produced (®gure 29). Length, 11.3 mm; width, 3.9 mm.

Male genitalia (®gure 39).

Female. Unknown.

Type material. Described from one specimen, the holotype l(California Academy of Sciences), labelled as follows: Mex, Baja Calif. N. 14 km S Rosarito 28 ss 31 ¾ 41 ², 114 ss 02 ¾ 14 ², 12-VII-88 R. L. Westcott (p)/on small plant Baccharis sarathroides along Hwy. I (h)/ Hippomelas (p) granulatu s VanD. (h) det. R.L. Westcott (p)/(red label) HOLOTYPE Gyascutus (s. str.) paragranulatus G. H. Nelson (p) l(h).

Distribution (®gure 49). Known only from the type locality.

Biology. The only known specimen was collected on a small plant of Baccharis sarothroides Gray.

Comparisons. Similar to G. granulatus (VanDyke) but it diOEers as follows: the width between eyes compared to the width of an eye, both measured from a dorsal view, is distinctly narrower; the pronotum is slightly more transverse, widest at the posterior margin, in G. granulatus as wide at the middle as at posterior margin; the profemur is less robust than in G. granulatus ; mesotibia slightly arcuate, straight in G. granulatus ; metatarsomere 1 longer than 2 1 3, subequal in G. granulatus ; and male genitalia more slender than in G. granulatus . From G. westcotti , G. paragranul - atus diOEers as follows: head between eyes compared to eye width much narrower; pronotum relatively narrower; and elytra less costate. It might be confused with some small specimens of G. insularis but G. paragranulatu s diOEers in having shorter antennae, the elytra are less costate; the protibiae are less arcuate with teeth less evident; and the male genitalia are more robust.

Etymology. Named for its similarity to G. granulatus (VanDyke) .

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Buprestidae

Genus

Gyascutus

Kingdom

Plantae

Phylum

Magnoliopsida

Class

Magnoliopsida

Order

Asterales

Family

Asteraceae

Genus

Baccharis

Kingdom

Plantae

Phylum

Magnoliopsida

Class

Magnoliopsida

Order

Asterales

Family

Asteraceae

Genus

Baccharis

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Buprestidae

Genus

Gyascutus

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Buprestidae

Genus

Gyascutus

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