Calyxochaetus tohono, Runyon, 2024

Runyon, Justin B., 2024, Revision of the genus Calyxochaetus Bigot (Diptera: Dolichopodidae: Sympycninae), Zootaxa 5539 (1), pp. 1-74 : 70-71

publication ID	https://doi.org/ 10.11646/zootaxa.5539.1.1
publication LSID	lsid:zoobank.org:pub:7BDB9666-CA90-40BF-8F65-B9897CDA1F2B
DOI	https://doi.org/10.5281/zenodo.14240422
persistent identifier	https://treatment.plazi.org/id/FD1A87BF-A569-FFA3-50D3-FA3DFBDBFCC6
treatment provided by	Plazi
scientific name	Calyxochaetus tohono
status	sp. nov.

Treatment

Calyxochaetus tohono sp. nov.

( Figs 111 View FIGURES 104–119 , 127 View FIGURES 120–131 , 143 View FIGURES 139–143 , 148 View FIGURES 147–148 )

Type material. HOLOTYPE ♂, labeled: “ ARIZONA: Santa Cruz Co. / Sonoita Crk nr Patagonia / Lake inlet 3775 ft / N31°29.95′ W110°50.69′ / 03APRIL2016, J.B. Runyon ”; “ HOLOTYPE / Calyxochaetus / tohono / J.B. Runyon [red label]” (USNM) ( Fig. 143 View FIGURES 139–143 ) GoogleMaps . PARATYPES: USA: Arizona: Same data as holotype (2♂, CAS; 2♂, CNC; 10♂, MTEC; 2♂, USNM); Cochise County: Southwestern Research Station , Portal , 5–9.vi.1972, Malaise, W.W. Wirth (1♂, USNM); South Fork Cave Creek , Chiricahua Mts , 5235 ft, 17.iv.2003, JBR & RLH (1♂, MTEC); San Pedro River , 4 mi. E Sierra Vista, 4025 ft, 23.iv.2002, RLH & JBR (2♂, 2♀, MTEC); Garden Canyon , Huachuca Mts , 5300 ft, 16.iv.2003, JBR & RLH (4♂, MTEC); Pima County : Madera Canyon , 23.vi.1982, RLH (1♂, MTEC); Santa Cruz County : Tubac , 29.ix.1972, L.J. Ogden & FCH (1♂, FSCA); Sycamore Canyon , 14 mi. NW Nogales, 4000 ft, 14.iv.2003, JBR & RLH (3♂, 12♀, MTEC); Patagonia Lake , 3750 ft, 15.iv.2003, JBR & RLH (9♂, 2♀, MTEC); Ruby Road W Peña Blanca Lake , ca. 4200 ft, 31°23.4′N 111°07.4′W, 21–22.viii.2007, yellow pan trap along creek, J.M. Cumming & S.E. Brooks (2♂, 1♀, CNC); same data except, sweep creek margin, S.E. Brooks (2♂, CNC); same data except, J.M. Cumming (1♂, 1♀, CNC) GoogleMaps .

Diagnosis. Males can be recognized by the medium-sized lanceolate lamellae on the arista-like stylus of males ( Fig. 111 View FIGURES 104–119 ), yellow metepimeron, and hind tibia with posteroventral row of slender setae (as in Fig. 134 View FIGURES 132–138 ). This species is similar to C. ornatus but is smaller and males have an arista-like stylus with smaller lanceolate lamella.

Description. Male. Wing length 2.8–3.3 mm. Similar to C. ornatus except as noted: Head: Face silver with golden yellow tinge. Postpedicel ( Fig. 111 View FIGURES 104–119 ) slightly longer then wide, often with slight subapical ventral indentation (a few specimens have more rounded postpedicel); arista-like stylus ( Fig. 111 View FIGURES 104–119 ) with smaller lanceolate lamella (width less than half width of postpedicel). Scutellum without distinct blue-violet reflections medially (at most weak reflections). Legs: Foreleg: Tarsomere 3 two-thirds length of tarsomere 4. Hindleg: Tibia with posteroventral row of slender setae on basal half slightly smaller, more uniform in length. Abdomen: Hypopygium: Postgonites with apical lobes bluntly rounded with dorsal edge slightly curved, shiny light to dark brown.

Female. Wing length 2.9–3.3 mm. Similar to C. ornatus except postpedicel usually as long as wide; tergite 4 usually wholly brown occasionally with small faint yellow ventrolateral spot.

Distribution and seasonal occurrence. Known from southeastern Arizona ( Fig. 148 View FIGURES 147–148 ). Adults have been collected from April through September.

Remarks. Adults were observed at several sites sitting on, and flying around, low vegetation and algae-covered stagnant water of side-pools of creeks in the shade of willows ( Fig. 3 View FIGURES 1–4 ) and large rocks.

Etymology. Named in honor of the Tohono Oʼodham, Native American people whose traditional territory included southern Arizona. The species name is considered a noun in apposition.