A revision of the minor species group in the millipede genus Nannaria Chamberlin, 1918 (Diplopoda, Polydesmida, Xystodesmidae)
Author
Means, Jackson C.
https://orcid.org/0000-0001-7377-0696
Virginia Tech, Department of Entomology, Blacksburg, Virginia 24061, USA
mjacks4@vt.edu
Author
Hennen, Derek A.
https://orcid.org/0000-0001-7005-1151
Virginia Tech, Department of Entomology, Blacksburg, Virginia 24061, USA
Author
Marek, Paul E.
https://orcid.org/0000-0002-7048-2514
Virginia Tech, Department of Entomology, Blacksburg, Virginia 24061, USA
text
ZooKeys
2021
2021-04-13
1030
1
180
http://dx.doi.org/10.3897/zookeys.1030.62544
journal article
http://dx.doi.org/10.3897/zookeys.1030.62544
1313-2970-1030-1
875199397EEE5F7898EA1DB25DA62D25
Nannaria sigmoidea (Hennen & Shelley, 2015)
Vernacular name: "The Sigmoid Gonopod Twisted-Claw Millipede" Fig. 112
Mimuloria dilatata sigmoidea
Hennen & Shelley, 2015: 1-15, figs 20, 21.
Nannaria sigmoidea
:
Means et al. 2021
: S72.
Material examined.
Holotype
:
United States
-
Tennessee
•
♂
;
Meigs County
, c.a.
7.2 km
S Decatur
, along country road 4274,
0.8 km
from junction of
Tennessee
highway 58; [
35.4378°N
, -
84.9140°W
];
14 Oct. 1978
;
R. M. Shelley
,
W. B. Jones
leg.; NCSM NCSM27946.
For
detailed collection data see
Suppl.
material 7.
Diagnosis.
Adult males of
N. sigmoidea
are distinct from other
Nannaria
, including the nearby
N. blackmountainensis
sp. nov. and
Nannaria
sp. nov.
'Cratagae'
(
Nannaria wilsoni
species group), based on the following combination of characters:
Gonopods
.
Gonopodal acropodite simple and gently curving anteromedially, not straight as in
Nannaria
sp. nov.
'Cratagae'
or with medial swelling as in
N. blackmountainensis
sp. nov. Acropodite with prominent, rounded lateral flange near tip (Fig.
112A
, red arrow), not hooked as in
N. blackmountainensis
sp. nov. or lacking as in
Nannaria
sp. nov.
'Cratagae.'
Acropodite tip directed posteriorly, not dorsally as in
N. blackmountainensis
sp. nov. Telopodite basal zone subequal to length of prefemoral process, not ca. 1/2 length as in
N. blackmountainensis
sp. nov. or ca. 1/3 length as in
Nannaria
sp. nov.
'Cratagae.'
Prefemur with prefemoral process bent at 90° angle at halfway point, directed medioventrally, not straight, acicular as in
N. blackmountainensis
sp. nov. and
Nannaria
sp. nov.
'Cratagae.'
Prefemoral spine reduced to small, blunt lobe at base of prefemoral process (Fig.
112A
, red triangle), not fused as a small ridge as in
N. blackmountainensis
sp. nov. or lacking as in
Nannaria
sp. nov.
'Cratagae.'
Color
.
Color in life unknown.
Figure 112.
Nannaria sigmoidea
holotype ♂ (NCSM NCSM27946) left gonopod
A
anterior view; red arrow indicates lateral flange; red arrow indicates reduced prefemoral spine
B
medial view
C
posterior view. Scale bar: 0.5 mm.
Measurements.
♂ holotype (NCSM, NCSM27946): BL = 36.1, CW = 5.0, IW = 3.0, ISW = 1.1, B11W = 6.0, B11H = 3.8.
Variation.
No known variation.
Distribution.
Known only from the type locality (Tennessee: Meigs County; Suppl. material 7; Fig.
129
). Distribution area: N/A; status: MRE.
Ecology.
Hennen and Shelley (2015)
note that only that the type specimens were collected from the east side of the Tennessee River.
Etymology.
Hennen and Shelley (2015
: 15) stated that "[t]he subspecific name denotes the overall sigmoidal curvature of the prefemoral process, which also passes through numerous vertical planes."
Note on clade membership.
No specimens of
Nannaria sigmoidea
were collected for this study.
Nannaria sigmoidea
shares gonopodal characters with members of the
Nannaria ambulatrix
clade, such as a prominent lateral flange on the acropodite tip, a prefemoral process bent at 90°, and crossing of the acropodites in the medial view (found in
N. ambulatrix
sp. nov. and
N. botrydium
sp. nov.). However, due to the wide geographic separation between
N. sigmoidea
and the
Nannaria ambulatrix
clade (> 270 km), and the presence of these characters in a member of the
Nannaria minor
clade (
N. kassoni
sp. nov.), the phylogenetic placement of
N. sigmoidea
in a clade is uncertain.
Type locality.
United States, Tennessee, Meigs County, c.a. 7.2 km S Decatur, along country road 4274, 0.8 km from junction of Tennessee highway 58.
Notes.
In the original publication,
Hennen and Shelley (2015
: 15) designate a male holotype collected by R. M. Shelley and W. B. Jones on October 14, 1978.
Figure 113.
The 17
Nannaria minor
species group clades represented by males. Black star:
Nannaria scholastica
, sky blue:
N. domestica
clade, orange:
N. fowleri
clade, burnt orange star:
N. hardeni
, brown:
N. serpens
clade, light yellow:
N. paupertas
clade, green:
N. mcelroyorum
clade, cranberry pink:
N. tasskelsoae
clade, turquoise:
N. castanea
clade, lime green:
N. laminata
clade, purple:
N. ambulatrix
clade, yellow:
N. ignis
clade, camo green:
N. tennesseensis
clade, blue:
N. ohionis
clade, light pink:
N. blackmountainensis
clade, forest green:
N. terricola
clade, red:
N. minor
clade.
Figure 114.
Geographic distributions of the 18
Nannaria minor
group clades. Black dot:
Nannaria scholastica
, sky blue:
N. domestica
clade, orange:
N. fowleri
clade, white:
N. paupertas
clade, dark green:
Nannaria
'Murphy'
clade, green:
N. mcelroyorum
clade, burnt orange:
N. hardeni
, brown:
N. serpens
clade, turquoise:
N. castanea
clade, neon green:
N. laminata
clade, cranberry pink:
N. tasskelsoae
clade, camo green:
N. tennesseensis
clade, yellow:
N. ignis
clade, blue:
N. ohionis
clade, pink:
N. blackmountainensis
clade, light green:
N. terricola
clade, purple:
N. ambulatrix
clade, red:
N. minor
clade.