Abrhexosa grossa (Cook)

Amorim, Dalton de Souza & Brown, Brian V., 2020, Urban Scatopsidae (Diptera) of Los Angeles, California, United States, Insect Systematics and Diversity 4 (1), No. 1, pp. 1-41 : 36-37

Abrhexosa grossa (Cook)

( Figs. 11, 12 , 25, 26 , and 75–81)

Abrhexosa grossa (Cook), 1956a: 6 , figs. 1B (♂ terminalia), 2B (♂ segment 7), 3D (♀ terminalia) ( Rhexoza ). Type ♂, UCC.

Ref.– Cook 1975 (redescription), Figs. 7 (♂ segment 7), 15 (♂ terminalia), 22 (♀ terminalia). Amorim 2007 (new combination).

Diagnosis. Male tergite 7 with a medial notch on posterior margin, tergite 9 typically flat and rounded distally.

Material Examined. 1 ♀, United States, California, Los Angeles Co., Los Angeles, Los Feliz, 34.116°N 118.279°W, BioSCAN site

6, Malaise trap, 29 March–14 April 2014, 199 m, Coll. Jeff, Aaron and Jacob Koch, BioSCAN sample 15939 (on slide) ( LACM) ; 1 ♀, same data, but 1–5 January 2014, BioSCAN sample 15568 (on slide) ( LACM) ; 1 ♀, same data, but 4–10 May 2014, BioSCAN sample 16104 ( MZUSP) ; 1 ♀, United States, California, Los Angeles Co., Glendale , 34.149°N 118.218°W, BioSCAN site 13, Malaise trap, 245.4 m, Coll. Karen Hoffman, BioSCAN sample 16211 ( LACM) ; 1 ♂, United States, California, Los Angeles Co., Los Angeles, Elysian Park , 34.078°N 118.234°W, BioSCAN site 14, Malaise trap, 149 m, Coll. Eric and Victoria Harding, BioSCAN sample 16352 ( LACM) ; 1 ♀, same data, but BioSCAN sample 16347 ( LACM) ; 1 ♂, same data, but 3–10 May 2014, BioSCAN sample 15992 ( MZUSP) ; 1 ♀, United States, California, Los Angeles Co., Los Angeles, Echo Park , 34.074°N 118.264°W, BioSCAN site 22, 2–9 December 2014, Malaise trap, 133.5 m, Coll. Erin Johnson, BioSCAN sample 16824 ( LACM) ; 1 ♀, United States, California, Los Angeles Co., Los Angeles, Highland Park , 34.123°N 118.193°W, BioSCAN site 29, Malaise trap, 28 December 2013 – 4 January 2014, 205.6 m, Coll. Natalie Brejcha, BioSCAN sample 15489 ( LACM) ; 1 ♀, United States, California, Los Angeles Co., Los Angeles , 34.103°N – 118.216°W, BioSCAN site 31, Malaise trap, 74 m, Coll. Julian Donahue, BioSCAN sample 16206 ( LACM) ; 1 ♀, same data, but BioSCAN sample 16202 ( LACM) ; 1 ♀, same data, but 3–10 May 2014, BioSCAN sample 16009 ( LACM) ; 1 ♀, United States, California, San Bernardino Co., Grand Terrace , 34.024°N 117.315°W, BioSCAN site 39, 7–14 April 2016, Malaise trap, 322 m, Coll. Dave Goodward, BioSCAN sample 18221 (on slide) ( LACM) ; 1 ♀, United States, California, San Bernardino Co., Chino Hills , 34.003°N 117.734°W, BioSCAN site 45, Malaise trap, 1–8 March 2016, 225 m, Coll. Joe Williams, BioSCAN sample 18166 (on slide) ( LACM) .

Distribution. Canada (British Columbia), United States (Oregon, California).

Remarks. The type locality of Abrhexoza grossa is Del Puerto Canyon, in central California, and the species is also known from Oregon and British Columbia. In the original description, Cook (1956a) mentioned that the type is at the ‘University of California Collection’, which probably means the University of California at Davis. In our samples, this species appeared in the BioSCAN sites 6, 13, 14, 22, 29, 31, 39, and 45. The sites of Phase I (1–32) are all at the northern range of the BioSCAN collecting sites, which may have influence of the fauna at the mountains of the northern range of the city. Altitude of BioSCAN collecting sites vary from 9 m to 245 m ( Brown and Hartop 2016) ( Table 1 ) and the sites with A. grossa catches are all above 130 (except for site 31, which is at 74 m). Two Phase II sites with specimens of A. grossa are at the eastern most range of the BioSCAN collecting sites. Some specialized phorid species, as Anevrina variabilis Borgmeier , a scavenger in rodent burrows ( Brown and Hartop 2016), were found at the northernmost Phase I BioSCAN sites close to the surrounding mountain natural areas, suggesting that some elements of the fauna have a restricted distribution in the area of Los Angeles.

Figures

Figs. 11–14. Habitus. 11. Abrhexosa grossa (Cook), male. 12. Akorhexosa grossa (Cook), female. 13. 10. Abrhexosa ryckmani (Cook), male. 14. Cooka melanderi (Cook), male.

Figs. 25–27. Abdomen.25. Akorhexosa grossa (Cook), male. 26. Akorhexosa grossa (Cook), female. 27. Cooka melanderi (Cook), male.

Figs. 7–10. Habitus. 7. Coboldia fuscipes (Meigen), male (black arrow indicates the diagnostic tergite 8 spatulate projection). 8. Coboldia fuscipes (Meigen), female. 9. Quateiella quatei (Cook), male. 10. Quateiella quatei (Cook), female.