Bregmosina schizosterna, Marshall, Stephen A., 2013

Marshall, Stephen A., 2013, Bregmosina, a new Neotropical genus of Limosininae (Diptera: Sphaeroceridae), Zootaxa 3641 (3), pp. 260-270 : 268-269

publication ID

https://doi.org/ 10.11646/zootaxa.3641.3.5

publication LSID

lsid:zoobank.org:pub:E5849A06-1F26-47ED-91E4-433A1F57B0BE

DOI

https://doi.org/10.5281/zenodo.6165138

persistent identifier

https://treatment.plazi.org/id/039B878E-442A-9C0C-DFE6-FAA2FB993A72

treatment provided by

Plazi

scientific name

Bregmosina schizosterna
status

sp. nov.

Bregmosina schizosterna View in CoL new species

Figs. 23–26 View FIGURES 23 – 26

Description (male only): Length (antennal base to wing tip) 2.6 mm. Eye height 2.7X genal height. Tarsomeres 1– 5 of fore leg strikingly broad and flat, broader than fore tibia, broadest at middle with distal part of tarsomere 1 and all of tarsomeres 2 and 3 of equal width, each tarsomere progressively slightly shorter. Tarsomeres 1 and 2 of hind leg strongly swollen; second tarsomere as long as tarsomeres 3, 4, and 5 combined. Mid tibia with 4 distal dorsal bristles, including a long anterodorsal, a long dorsal and short (length equals tibial width), subequal dorsal and posterodorsal bristles. Mid tibia with two apical ventral bristles.

Male abdomen: All sternites strongly modified, sternites 2–5 completely divided medially. Sternites 3–5 with each half including a broad lateral plate and a narrow medial arm, sternite 5 further including a posterior lobe with a cluster of short, stout bristles on its medial surface followed by a pale, long-setose medial surface. Ventral part of sternite 6 narrow, with an anterior concavity facing genital pouch. Ring sclerite not seen. Cerci broad, separate, diverging distally and tapered to a nipple-like distal medial apex. Surstylus elongate-rectangular, apex symmetrically tapered to a narrow lobe. Postgonite with a broad base and a narrow, parallel sided distal portion. Basiphallus simple, without epiphallus. Distiphallus with a tubular base, a prominent flat posteromedial process, and broad, rounded distal arms.

Type material. Holotype male (QCAZ): ECUADOR. Maquipucuna Biological Reserve. 1200 m, treefall, yellow pans, 26–28.iv.2002, M. Buck and S.A. Marshall (debu00202723).

Comments. Bregmosina schizosterna is a remarkably distinctive species because of the conspicuously modified abdominal sternites and the broadly swollen first tarsus, but other aspects of the male terminalia are similar to B. ephydriformia and B. bucki .

Etymology. Bregmosina schizosterna is named for the unusual split male sternites.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Sphaeroceridae

Genus

Bregmosina

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