Lasioglossum (Dialictus) petrellum ( Cockerell, 1903 )

Gardner, Joel & Gibbs, Jason, 2020, The ‘ red-tailed’ Lasioglossum (Dialictus) (Hymenoptera: Halictidae) of the western Nearctic, European Journal of Taxonomy 725, pp. 1-242 : 167-169

Lasioglossum (Dialictus) petrellum ( Cockerell, 1903)

Fig. 73

Halictus petrellus Cockerell, 1903: 84 (holotype, ♀, deposited in USNM, examined).

Halictus coronadensis Cockerell, 1916: 56 (holotype, ♂, deposited in USNM, examined; synonymy by Timberlake in Michener 1951).

Halictus (Chloralictus) petrellus – Sandhouse 1924: 3 (key).

Lasioglossum (Chloralictus) petrellum – Michener 1951: 1116 (catalog).

Dialictus petrellus – Hurd 1979: 1970 (catalog). — Moure & Hurd 1987: 121 (catalog).

Lasioglossum (Dialictus) petrellum – Gibbs 2009: 376, figs 7a–b, 8a–b, 9a–d (key, redescription).

Diagnosis

Both sexes of Lasioglossum petrellum can be recognized by the characters for the Lasioglossum petrellum species complex (below), in addition to the characters given in the keys. They are most similar to L. droegei . Females of L. droegei have T2–4 with more extensive tomentum, and metasoma usually mostly red-orange. Males of L. droegei have T1–3 apical areas with very strong microsculpture (similar to scutum) and indistinct punctures. In addition, the distributions of these two species are not known to overlap: L. petrellum is known from the Sonoran Desert and west coast of California and Baja California, while L. droegei is only known from the Chihuahuan Desert.

Etymology

Cockerell (1903) named this species after the type locality of San Pedro, California, after Latinizing the name Pedro to Petra and adding the adjectival diminutive suffix ‘- ellus ’.

Material examined

Holotype

UNITED STATES – California • ♀; San Pedro ; [33.74° N, 118.29° W]; Jul. 11 year unknown; Cockerell leg.; USNM 27771 .

Other material

MEXICO – Baja California • 1 ♂; Coronado Islands ; [32.4° N, 117.244° W]; Aug. 21 year unknown; T. and W. Cockerell leg.; USNM • 3 ♀♀; Los Frailles ; 18 Mar. 1953; P.H. Arnaud leg.; CAS . – Baja California Sur • 1 ♂; Isle Carmen ; [26° N, 111.1° W]; 24 Jan. 1992; G.E. Hutchings leg.; GEH .

UNITED STATES – Arizona • 1 ♀; Yuma Co., Palm Canyon, Kofa Mountains ; [33.36° N, 114.1° W]; 8 Apr. 1963; W.A. Steffan leg.; EMEC • 1 ♀; Sabino Canyon ; [32.33° N, 110.8° W]; 9 Jul. 1952; R.H. and L.D. Beamer, W. LaBerge, A. Well, C. Liang and C. Weiner leg.; SEMC . – California • 1 ♀; San Bernardino Co., Caruthers Canyon ; [35.25° N, 115.3° W]; 1768 m a.s.l.; 11 Sep. 1994; T. Griswold leg.; ex Gutierrezia microcephala ; BBSL • 1 ♂; San Bernardino Co., Cima Dome, Sec 12 T14N R13E; [35.31° N, 115.54° W]; 1539 m a.s.l.; 16 Jun. 1980; T. Griswold leg.; BBSL • 2 ♀♀; San Bernardino Co., Granite Mts , Sc17T8NR13E; [34.78° N, 115.64° W]; 1234 m a.s.l.; 22–25 May 1983; T L. Griswold leg.; ex Cylindropuntia echinocarpa ; BBSL • 1 ♀; San Bernardino Co., Granite Mts , Sec 17 T8N R13E; [34.78° N, 115.64° W]; 1234 m a.s.l.; 9 Jun. 1980; T. Griswold leg.; BBSL • 1 ♀; San Bernardino Co., Sheep Corral ; 34.7348° N, 115.6815° W; 24 May 1995; T. Griswold leg.; ex Sphaeralcea ambigua ; BBSL • 1 ♀; San Bernardino Co., Willow Wash , Sec24 T13N R10E; [35.2° N, 115.87° W]; 671 m a.s.l.; 6 Apr. 1983; T. and R. Griswold leg.; BBSL • 4 ♀♀; San Diego Co., La Jolla ; [32.83° N, 117.27° W]; 7 Jul. 1963; P.D. Hurd leg.; ex Mesembryanthemum crystallinum ; EMEC • 1 ♀; Santa Barbara Co., Tunnel Rd ; [34.456° N, 119.71° W]; 10 May 1985; Pritchett leg.; CCBER • 4 ♀♀; Anza-Borrego, Lost Vlly. Rd.; 33.3746° N, 116.6141° W; 2 May 2015; Hung, Cen and Davids leg.; WRME • 1 ♀; San Diego ; [32.7° N, 117.1° W]; 17 May 2004; DB leg.; WRME • 1 ♀; Sunset Cove, Granites Res. Stn Mojave Desert ; 34.779° N, 115.6631° W; 13 Apr. 2017; J. Braun leg.; PCYU • 1 ♀; same location as for preceding; 25 Apr. 2018; J. Braun leg.; PCYU • 1 ♀; same location as for preceding; 28 Apr. 2018; J. Braun leg.; PCYU .

Description

See Gibbs (2009b) for a complete redescription and figures.

Range

Coasts and deserts of southern California and Baja California, east through southern Arizona ( Fig. 73 ).

Floral records

AIZOACEAE Martinov : Mesembryanthemum L. M. crystallinum L. • AMARANTHACEAE Juss. Atriplex L. A. semibaccata R.Br. (G09) • ASTERACEAE Giseke : Encelia : E. farinosa A.Gray ex Torr. (G09) • Ericameria : E. nauseosa (Pall. ex Pursh) G.L. Nesom & Baird : E. n. var. nauseosa (Pall. ex Pursh) G.L. Nesom & Baird (G09) • E. palmeri (A.Gray) H.M. Hall (G09) • E. parishii (Greene) H.M. Hall (G09) • Gutierrezia : G. microcephala (DC.) A.Gray • Hypochaeris : H. glabra L. (G09) • Lepidospartum : L. squamatum (A.Gray) A.Gray (G09) • BORAGINACEAE Juss. Phacelia Juss. P. distans Benth. (G09) • P. minor (Harv.) Thell. ex F. Zimm. (G09) • CACTACEAE Juss. Cylindropuntia (Engelm.) F.M. Knuth : C. echinocarpa (Engelm. & J. M. Bigelow) F.M. Knuth • Ferocactus Britton & Rose : F. cylindraceus (Engelm.) Orcutt (G09) • CRASSULACEAE J. St. -Hil. Dudleya Britton & Rose (G09) • MALVACEAE Juss. Sphaeralcea A. St. -Hil. S. ambigua A.Gray • PLANTAGINACEAE Juss. Penstemon Schmidel (G09) • SCROPHULARIACEAE Juss. Scrophularia L. S. californica Cham. & Schltdl. (G09) • SOLANACEAE Adans. Datura L. D. inoxia Mill. (G09).

DNA barcodes

Three sequences available (BOLD process IDs: DLII1372-08, DLII1415-08, DLII1418-08; BIN: BOLD:AAF4030). Lasioglossum petrellum differs from all other western red-tailed L. ( Dialictus ) by 4 fixed substitutions: 4(T), 373(G), 402(G), and 432(C). It differs from L. droegei , L. griswoldi , and L. tuolumnense by an additional 8 fixed substitutions: 78(T), 105(T), 132(C), 216(G), 334(G), 363(C), 456(C), and 624(T) (Supplementary file 4).

Remarks

Gibbs (2009b) recorded this species only from California and Baja California. Additional specimens are now known from Arizona.

Figures

Fig. 73. Georeferenced collection records of Lasioglossum (D.) petrellum (Cockerell, 1903) (black squares) and predicted distribution by maximum entropy ecological niche modeling in Maxent (colour shading). Warmer colours indicate higher cloglog probability of occurrence.