Broscosoma Rosenhauer, 1846

Kavanaugh, David H. & Liang, Hongbin, 2021, Inventory of the Carabid Beetle Fauna of the Gaoligong Mountains, Western Yunnan Province, China: Species of the Tribe Broscini (Coleoptera: Carabidae)., Proceedings of the California Academy of Sciences 67 (4), pp. 85-182 : 108

publication ID

https://doi.org/ 10.5281/zenodo.11067355

DOI

https://doi.org/10.5281/zenodo.12575560

persistent identifier

https://treatment.plazi.org/id/03AF0B0C-FFC8-FFAD-FE7B-FE12A3FAFEDD

treatment provided by

Felipe

scientific name

Broscosoma Rosenhauer, 1846
status

 

Genus Broscosoma Rosenhauer, 1846 View in CoL

Broscosoma Rosenhauer, 1846:1 View in CoL . Type species: Broscosoma baldense Rosenhauer, 1846:4 View in CoL .

Diagnosis. Members of this genus can be distinguished from those of other broscine genera in the region by the following combination of character states: body small to moderate in size (BL>13.0 mm); body surface with or without metallic reflection; head with post-temporal transverse sulcus moderately deep and broadly or narrowly punctate; genal ridge present, but varied in extent; maxillae with two setae on eustipes, stipes with dorsobasal setae at least half as long as ventrobasal setae; mentum with one pair of setae present, paramedial region moderately to deeply foveate; submentum with one to three pairs of setae; antennae with antennomeres 3 and 4 glabrous except for apical whorl of fixed setae; pronotum with basolateral setae absent; elytra with parascutellar seta present, umbilicate setal series comprised of one post-humeral and two preapical setae; male protarsi with pads on adhesive setae ventrally on tarsomeres 1 to 3, and mesotarsi with pads of adhesive setae on tarsomeres 1 and 2.

Taxonomic notes. The generic diagnosis presented above properly applies only among those species occurring in the study area. Members of some species of the genus occurring elsewhere present exceptions to several of the character states listed. Even the features most widely applied as characteristic of the genus are subject to exceptions, including among species of the study area. Roig-Juñent (2000) distinguished Broscosoma species from Miscodera arctica (Paykull), 1798 principally on differences in the lateral margination of the pronotum (present in Miscodera and absent from Broscosoma ) and paramedial foveae on the mentum (present in Miscodera and absent from Broscosoma ). However, we have found lateral margination of the pronotum present in at least some form ( Figs. 9 View FIGURE a-d) in several of the species occurring in the study area and fully present in members of one species. Similarly, we have found that members of most Broscodera species in the study area have at least shallow paramedial foveae on the mentum, and one species has foveae comparably deep to those of M. arctica members. Other features listed by Roig-Juñent in his description of the genus are also subject to greater variation among Broscosoma species in the study area than was represented in his sample of only three species. Among these are development of the genal (or “temporal”) ridge ( Figs. 10 View FIGURE a-d), number of pairs of setae on the submentum, and pubescence on antennomere 4.

Since Sciaky and Facchini (2005) presented their excellent key to the Broscosoma species of China, the number of species known from that country has more than tripled, from eight to 26, not including any of the species newly described herein. Clearly, a new key to Chinese species is needed; but new species continue to be discovered (see Jiang et al. 2020 and Jiang et al. 2021 for the most recent additions) at such a rate as to make creating such a key a rapidly ‘moving target’, which we plan to attempt, nonetheless, in the near future.

Diversity and geographical distribution. To date, 43 species and an additional five subspecies of Broscosoma have been described. The genus is strictly Palearctic in distribution, with a range extended from the Alps of northern Italy eastward to Japan and Taiwan, but with wide disjunctions apparent. The main distributional gaps occur between (1) northern Italy and the Caucasus Mountains, (2) the Caucasus and the Himalaya in central Nepal, and (3) Chongqing and Shaanxi Provinces and Fujian Province, Taiwan, and Japan.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Carabidae

Loc

Broscosoma Rosenhauer, 1846

Kavanaugh, David H. & Liang, Hongbin 2021
2021
Loc

Broscosoma

Rosenhauer, W. G. 1846: 1
Rosenhauer, W. G. 1846: 4
1846
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