Bembidion corgenoma, Maddison, 2020

Maddison, David R., 2020, Shards, sequences, and shorelines: two new species of Bembidion from North America (Coleoptera, Carabidae), ZooKeys 1007, pp. 85-128 : 85

publication ID

https://dx.doi.org/10.3897/zookeys.1007.60012

publication LSID

lsid:zoobank.org:pub:408A5B35-D605-4D90-A468-84D14E78AC3D

persistent identifier

https://treatment.plazi.org/id/BF5E001D-F543-4149-8081-0BF7B99A8484

taxon LSID

lsid:zoobank.org:act:BF5E001D-F543-4149-8081-0BF7B99A8484

treatment provided by

ZooKeys by Pensoft

scientific name

Bembidion corgenoma
status

sp. nov.

Bembidion corgenoma sp. nov.

Holotype.

Male, in OSAC, labeled: "USA: Oregon: Benton Co., Corvallis, Willamette River, 60 m, 44.5491°N, 123.2449°W, 7.x.2019. DRM 19.210. D.R. Maddison", "David R. Maddison DNA5673 DNA Voucher" [pale green paper], "HOLOTYPE Bembidion corgenoma David R. Maddison" [partly handwritten, on red paper], "Oregon State Arthropod Collection OSAC_0002000008 [matrix code]" [printed on both sides of white paper]. Genitalia mounted in Euparal in between coverslips pinned with specimen; extracted DNA stored separately. GenBank accession numbers for DNA sequences of the holotype are MW151449, MW151463, MW151491, MW151520, and MW151548.

Paratypes

(193). USA: Oregon: Benton Co., Corvallis, Willamette River, 44.5491°N, 123.2449°W, 60 m [type locality] (78: OSAC, CNC, CAS, UAIC, UASM, MCZ, EMEC, CSCA); USA: Oregon: Benton Co., Corvallis, Willamette River, 60 m, 44.5491°N, 123.2451°W (10: OSAC); USA: Oregon: Benton Co., Corvallis, Willamette River, 44.5475°N, 123.2428°W, 60 m (35: OSAC, USNM, NHMUK, MNHM, UBCZ); USA: Oregon: Benton Co., Corvallis, Willamette River, 60 m, 44.5478°N, 123.2430°W (2: OSAC); USA: Oregon: Benton Co., Corvallis, 62 m, 44.5491°N, 123.2449°W (6: OSAC); USA: Oregon: Linn Co., Willamette River, Truax Island, 44.5853°N, 123.1913°W, 60 m (12: OSAC); USA: Oregon: Lane Co., Goodman Creek, Willamette NF, 43.8441°N, 122.6736°W, 290 m (2: OSAC); USA: Oregon: Coos Co., Crooked Creek S of Bandon, 43.0814°N, 124.4335°W, 7 m, 24.iii.2014 (26: OSAC); USA: California: Tehama Co., Red Bluff, Sacramento River, 40.1759°N, 122.229°W, 73 m (22: OSAC, CAS, EMEC).

Type locality.

USA: Oregon: Benton Co., Corvallis, Willamette River, 44.5491°N, 123.2449°W.

Derivation of specific epithet.

The specific epithet is formed from the Latin word cor, meaning heart, and genoma, a modification (for easier pronunciation) of the coined word “genome”. Corgenoma refers to this species being the heart or current focus of genomic studies in small carabid beetles. Cor - also alludes to the type locality of Corvallis, Oregon, whose name is derived from Latin, and means "heart of the valley". It is to be treated as a noun in apposition.

Diagnosis and description.

Length (5.8-7.4). Relatively light in color compared to B. transversale and B. erosum , with legs and basal three antennomeres pale, testaceous or rufo-testaceous. Head and prothorax piceous, with metallic reflections, on pronotum green or aeneous, on head bluish or green. Elytra paler, with shoulders and most of the anterior half testaceous with an orange tint, bordered posteriad by a dark band (with intervals 1-3 in this region dark rufous), followed by a pale testaceous band that either extends to the apex or that is bounded posteriad by dark lateral spots which in the darkest individuals merge in the middle. Mentum with anterior lateral region as typical for a Bembidion : triangular, large, and with anterior margin significantly anteriad of the central tooth (Fig. 13A View Figure 13 ); central tooth trapezoidal, rounded. Prothorax cordate, with more sinuate margins than B. perspicuum , with a relatively smooth basal region, with minute punctures; pronotum without or with very faint, oblique posterolateral carina as in other members of this group. Elytral striae 1-5 complete; stria 6 distinct and strong through much of its length; stria 7 shallower, less impressed than 6, but distinct. Microsculpture of elytra very transverse, with little tendency to form meshes. Two discal setae on each elytron, close to third stria. Tip of aedeagus not abruptly curved downward (Fig. 14E, F View Figure 14 ); basal sclerotized lobe small (Fig. 15C View Figure 15 ); apex of flagellar sheath with dark area triangular (Fig. 16E, F View Figure 16 ).

Additional characteristics.

Diploid chromosome number 24, with 11 pairs of autosomes and an XY/XX sex chromosome system ( Pflug, et al. 2020). Genome size (1C), as measured by flow cytometry, 2118 Mb in males and 2193 Mb in females ( Pflug, et al. 2020). Most specimens with singleton (non-conjugated) sperm ( Gómez and Maddison 2020).

Available genomic and transcriptomic data.

Transcriptomic data for one specimen is available on NCBI’s Sequence Read Archive at accession SRR8801541, and genomic data of four specimens at accessions SRR8518612, SRR8518625, SRR8518626, and SRR8518631 ( Pflug, et al. 2020).

Notes.

This species was called Bembidion haplogonum Chaudoir in Gustafson et al. (2019; 2020), and B. sp. nr. transversale in some other publications ( Gómez and Maddison 2020; Kanda, et al. 2015; Pflug, et al. 2020).

Geographic distribution.

This species occurs from central British Columbia south through the Willamette Valley of Oregon, the Central Valley of California, with some records in Nevada, Idaho, eastern Washington, and Montana (Fig. 19 View Figure 19 ), thus overlapping with the range of B. transversale .

Geographic variation.

The specimens on or close to the beaches of the Pacific Ocean appear on average slightly paler than more inland specimens.

Habitat.

This species occurs on gravel or cobble shores of the rivers and creeks (Fig. 4 View Figure 4 ), more often where the bank is relatively flat and has small amount of clay and silt mixed in with sand and gravel under the rocks. They also can be common under cobbles on the shores of small creeks on the upper portions of beaches of the Pacific Ocean.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Carabidae

Genus

Bembidion