Shards, sequences, and shorelines: two new species of Bembidion from North America (Coleoptera, Carabidae)
Author
Maddison, David R.
https://orcid.org/0000-0002-7152-3824
Department of Integrative Biology, Oregon State University, Corvallis, OR 97331, USA
david.maddison@science.oregonstate.edu
text
ZooKeys
2020
2020-12-30
1007
85
128
http://dx.doi.org/10.3897/zookeys.1007.60012
journal article
http://dx.doi.org/10.3897/zookeys.1007.60012
1313-2970-1007-85
408A5B35D6054D90A46884D14E78AC3D
0A16B87A3549522BB729306C3DA5FF88
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
); 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
); basal sclerotized lobe small (Fig.
15C
); apex of flagellar sheath with dark area triangular (Fig.
16E, F
).
Figure 13.
Mentum of
B. corgenoma
and
B. transversale
A
Two specimens of
B. corgenoma
from Corvallis, Oregon
B
Two specimens of
B. transversale
from Hayden Lake, Idaho
C
Two specimens of
B. transversale
from Wallowa State Park, Oregon
D
Two specimens of
B. transversale
from Point aux Pins, Michigan.
Figure 14.
Male genitalia of
B. transversale
subgroup
A
B. transversale
(voucher DNA4219, USA: Oregon: Harney County, Banks of Silver Creek, 1379 m,
43.7278°N
,
119.6256°W
)
B
B. transversale
(voucher DNA2161, Canada: Alberta: Lethbridge, Oldman River, 800 m,
49.7043°N
,
112.866°W
)
C
B. erosum
(voucher DNA4033, USA: Oregon: Curry Co., Floras Creek at route 124 SE Langlois, 21 m,
42.9132°N
,
124.4251°W
)
D
B. erosum
(voucher DNA3562, USA: California: Del Norte Co., Wilson Creek, 3 m,
41.6051°N
,
124.1005°W
)
E
B. corgenoma
(voucher DNA2180, USA: California: Sonoma Co., Russian River, 3 mi NE Healdsburg)
F
B. corgenoma
(holotype, voucher DNA5673, USA: Oregon: Benton Co., Corvallis, Willamette River, 60 m,
44.5491°N
,
123.2449°W
). Scale bar: 0.1 mm.
Figure 15.
Basal sclerotized lobe of internal sac of male
Bembidion transversale
group members
A
B. transversale
(voucher DNA4219, USA: Oregon: Harney County, Banks of Silver Creek, 1379 m,
43.7278°N
,
119.6256°W
)
B
B. erosum
(voucher DNA4033, USA: Oregon: Curry Co., Floras Creek at route 124 SE Langlois, 21 m,
42.9132°N
,
124.4251°W
)
C
B. corgenoma
(voucher DNA2180, USA: California: Sonoma Co., Russian River, 3 mi NE Healdsburg). Scale bar: 0.1 mm.
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 (
Gomez
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 (
Gomez
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
), 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
), 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.
Figure 16.
Central sclerite complex of
B. transversale
subgroup
A, B
B. transversale
(vouchers V101437 and V101436, USA: Michigan: Port aux Pins, Bois Blanc Isl.)
C, D
B. erosum
(vouchers V101440 and V101439, USA: California: Del Norte Co., Wilson Creek, 3 m,
41.6051°N
,
124.1005°W
)
E, F
B. corgenoma
(vouchers V101428 and V101430, USA: Oregon: Benton Co., Corvallis, Willamette River,
44.5475°N
,
123.2428°W
). Scale bar: 0.1 mm.
Figure 17.
Flagella of
B. transversale
subgroup
A, B
B. transversale
(vouchers V101438 and V101435, USA: Michigan: Port aux Pins, Bois Blanc Isl.)
C, D
B. erosum
(vouchers V101442 and V101441, USA: California: Del Norte Co., Wilson Creek, 3 m,
41.6051°N
,
124.1005°W
)
E, F
B. corgenoma
(vouchers V101434 and V101431, USA: Oregon: Benton Co., Corvallis, Willamette River,
44.5475°N
,
123.2428°W
). Scale bar: 0.1 mm.