Pachybrachis peninsularis, Fall, 1915

Barney, Robert J., 2021, Definition and Revision of the cylindricus Species-Group of North American Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae), Including Descriptions of Six New Species, The Coleopterists Bulletin 75 (4), pp. 723-748 : 739-742

publication ID

https://doi.org/ 10.1649/0010-065X-75.4.723

publication LSID

urn:lsid:zoobank.org:pub:9766A693-00DD-41CF-A7D3-5715CF0C03FC

persistent identifier

https://treatment.plazi.org/id/C436412B-FFFB-FF82-4099-F9EAFE2CFA31

treatment provided by

Felipe

scientific name

Pachybrachis peninsularis
status

 

10. PACHYBRACHIS peNINSULARIS Fall, 1915 ( Figs. 10 View Fig , 14B View Fig )

Pachybrachys peninsularis Fall 1915: 368 .

Type. Fall’s (1915) type male, hereby designated lectotype, labeled “San Felipe/Low, Cal. [printed, white paper]//TYPE [printed]/ peninsula / ris [hand-inked, white paper]//M.C.Z./Type [printed]/24963 [hand-inked, red paper]//H.C. FALL /COLLECTION [printed, white paper]//[circular blue disc signifying dissection by RJB]// LECTOTYPE / Pachybrachys / peninsularis Fall /R. J. Barney 2021 [printed, red paper]”, was examined, dissected, and photographed ( Fig. 10 View Fig ).

Redescription. Male. Large, yellow and brown maculate ( Fig. 10 View Fig ); L = 3.61 mm (n = 1); W = 1.99 mm (n = 1); L/W = 1.82 (n = 1). Head: Not wider than thoracic apex, HW = 1.27 mm (n = 1); eyes closely separated, without ocular lines, IOD = 0.25 mm (n = 1); IOD/HW = 0.19 (n = 1); face yellow with large, brown W-shaped macula connecting the vertex and bases of antennae and up to bases of upper lobes of eyes, punctation dense in dark areas, antennae progressing from yellow to brown, not reaching elytral declivity. Pronotum: Yellow with broad, diffuse M-shaped brown macula, densely punctate, less so at margins and median line, strongly narrowed apically; PL = 1.29 mm (n = 1); PW = 1.84 mm (n = 1); PL/PW = 0.70 (n = 1). Elytra: Yellow with standard brown maculae, densely punctate in baso-sutural area, striae irregular. Pygidium: Dark brown with 2 oval conjoined yellow spots. Venter: Dark brown with yellow side and apical margins. Legs: Yellow with brown spots, front claws of male greatly enlarged. Genitalia: Median lobe in en-face view shows large, oval OS, with a wide projecting triangular terminus, bounded on each side with large wisps at the ALM. The lateral view reveals a small keel, projecting from the base to the initiation of the wisps.A sub view of the median lobe shows that the keel ridge is very sharp. One male from Baja California, Mexico was dissected.

Remarks. Fall (1915) described P. peninsularis as “nearly identical” to P. turgidicollis . This is true externally, but the median lobes are easily separable. The only specimen of P. peninsularis known to me is the lectotype, which is from Mexico. This species was not listed by Riley et al. (2003).

Distribution. The only confirmed specimen I have seen is the lectotype from Baja California, Mexico ( Fig. 14B View Fig ).

Specimens Examined. Lectotype. MEXICO: Lower Baja California: San Felipe [1♂, LECTOTYPE, MCZ-FALL].

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Chrysomelidae

Genus

Pachybrachis

Loc

Pachybrachis peninsularis

Barney, Robert J. 2021
2021
Loc

Pachybrachys peninsularis

Fall, H. C. 1915: 368
1915
Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF