Feather mites (Acariformes, Astigmata) from marine birds of the Barton Peninsula (King George Island, Antarctica), with descriptions of two new species
Author
Han, Yeong-Deok
https://orcid.org/0000-0002-6625-8966
Department of Biological Sciences, Inha University, Incheon 22212, Republic of Korea & Restoration Assessment Team, Research Center for Endangered Species, National Institute of Ecology, Gowol-gil 23, Yeongyang-gun, 36531, Republic of Korea
Author
Mironov, Sergey V.
Zoological Institute, Russian Academy of Sciences, Universitetskaya embankment 1, Saint-Petersburg, 199034, Russia
Author
Kim, Jeong-Hoon
Korea Polar Research Institute, Yeonsu-gu, Incheon 21990, Republic of Korea
jhkim94@kopri.re.kr
Author
Min, Gi-Sik
Department of Biological Sciences, Inha University, Incheon 22212, Republic of Korea
mingisik@inha.ac.kr
text
ZooKeys
2021
2021-10-04
1061
109
130
http://dx.doi.org/10.3897/zookeys.1061.71212
journal article
http://dx.doi.org/10.3897/zookeys.1061.71212
1313-2970-1061-109
5239C96059FE4C04B8BF1D8FC33B4C75
621AC222512E581FAEE2DE9894D5E5D4
Ingrassia chionis
sp. nov.
Type material.
Male holotype (NIBR No. NIBRIV0000887181), 2 males and 3 females paratypes (NIBR No. NIBRIV0000887182-NIBRIV0000887186) from
Chionis albus
(Gmelin) (
Charadriiformes
,
Chionidae
), Antarctica, King George Island, Barton Peninsula,
62°14'13"S
,
58°46'33"W
, 11 January 2016, coll. by Han Y.-D.
Description.
Male
(Figs
5
,
7A-D
; holotype, range for 2 paratypes in parentheses): length of idiosoma from anterior end to bases of setae
h3
350 (350-355), greatest width 220 (230-240), length of hysterosoma 175 (173-175). Prodorsal shield: narrow longitudinal plate with almost parallel lateral margins and acute posterior end extending beyond level of scapular setae
se
; length along midline 113 (118), greatest width 28 (27-29); anterior end with short longitudinal ridge about 1/8th the length of shield (Fig.
5A
). Setae
se
and
si
at same transverse level, bases of setae
se
situated on teardrop-shaped sclerites and separated by 69 (73-77). Scapular shields wide, inner margins slightly convex, without suprategumental extensions. Hysteronotal shield: anterior margin convex, length of shield from anterior end to bases of setae
h3
213 (205-210). Setae
c2
and
d2
represented by macrosetae, 150 (150-150) and 110 (95-110) long, respectively; both pairs approximately 1.5 time shorter than humeral macrosetae
cp.
Opisthosomal lobes slightly longer than wide at base. Supranal concavity ovate, poorly outlined, separated from terminal cleft. Terminal cleft semi-ovate in shape, slightly narrowed anteriorly; length of terminal cleft from anterior end to bases of setae
h3
63 (58-62), greatest width 40 (41-42). Terminal membranous extensions on lobar apices short and widely rounded, length from bases of setae
h3
to apices of terminal extensions 20 (18-19), width of extensions at base 32 (27-28), length of incision between extensions 22 (19-20). Setae
ps1
situated approximately at level of setae
h2
. Distance between dorsal setae:
c2
:
c2
183 (180-188),
c2
:
d2
33 (37-38),
d2
:
e2
52 (50-53),
e2
:
h3
88 (83-84),
h3
:
h3
59 (55-57),
ps1
:
ps1
39 (36-37).
Figure 5.
Ingrassia chionis
sp. nov., male
A
dorsal view
B
ventral view.
Sternum about half as long as total length of epimerites I (Fig.
5B
). Anterior ends of epimerites IIIa free, widely separated from each other. Setae
4b
situated on anterior ends of epimerites IIIa and almost extending to mid-length of opisthosomal lobes. Pregenital apodeme (epiandrum) small bow-shaped, 10 (7-9) long, 35 (32-38) wide. Genital apparatus 13 (10-12) long and 27 (27-28) wide. Setae
g
situated on small genital shields. Adanal shields triangular, situated anterolateral to setae
ps3
. Epimerites IVa long, almost completely enclosing coxal fields IV. Central part of coxal fields IV not sclerotized. Diameter of adanal suckers 19 (19-20). Distance between ventral setae:
4b
:
4b
33 (35-36),
4b
:
3a
24 (27-29),
4b
:
g
41 (42-43),
g
:
ps3
29 (32-33),
ps3
:
h3
97 (93-95).
Tarsi I, II each with short apicodorsal extension. Tibiae I, II with well-developed ventral spine-like processes (Fig.
7A, B
). Seta
s
of tibia II spiculiform. Femorogenu II with thick spine-like retrograde apophysis. Tibia III with small angular apical extension bearing base of solenidion
φ
. Length of tarsus III 81 (78-79). Tarsus IV with finger-like apical extension; modified setae
d
,
e
short spiculiform, seta
e
situated on tarsal apex, seta
d
subapical (Fig.
7C
). Legs IV excluding pretarsus 55 (51-58) long, with tarsus and distal half of genu extending beyond level of lobar apices (bases of setae
h3
) (Figs
5
,
7D
).
Female
(Figs
6
,
7E, F
; range for 3 paratypes): length of idiosoma 400-435, greatest width 225-250, length of hysterosoma 220-238. Prodorsal shield: shaped approximately as in male, length 118-123, greatest width 30-33, anterior end with short longitudinal ridge about 1/8th the length of shield (Fig.
6A
). Setae
se
and
si
at same transverse level; bases of setae
se
situated on teardrop-shaped sclerites and separated by 75-82. Scapular shields wide, with smooth inner margin. Humeral shields well developed, without anteromesal extensions. Setae
c3
short, slightly longer than trochanters III. Hysteronotal shield: large longitudinal plate occupying median part of hysterosoma; anterior part slightly widened; anterior margin right-angular, extending to or beyond level of setae
c2
; lateral margins unevenly sinuous; posterior margin truncate or slightly concave, extending to level of setae
e2
; greatest length 158-168, greatest width 85-93. Setae
c2
,
d2
, and
e2
represented by macrosetae, 139-151, 112-131 and 81-93 long, respectively. Setae
d1
,
d2
, and
e1
situated on hysteronotal shield, setae
c2
,
e2
situated on striated tegument. Distance between dorsal setae:
c2
:
d2
63-73,
d2
:
e2
84-87,
e2
:
h3
82 87,
h3
:
h3
52-70.
Figure 6.
Ingrassia chionis
sp. nov., female
A
dorsal view
B
ventral view.
Sternum about half as long as epimerites I. Epigynum thick and is bow-shaped, 13-22 long, 58-64 wide, with tips bearing bases of setae
4b
. Apodemes of oviporus long, their posterior ends long and narrow, encompassing bases of setae
4a
(Fig.
6B
). Setae
4b
,
g
,
3a
, and
4a
short, not exceeding length of femorogenua III, IV. Setae
h3
approximately two-thirds the length of setae
h2
.
Legs I, II as in the male. Legs IV with tarsus extending beyond posterior end of opisthosoma. Tarsi III, IV without apical spines, length of tarsi III, IV 60-61 and 72-74, respectively. Setae
sR
III subequal to combined length of corresponding femur, genu, and tibia. Seta
w
of tarsus III and setae
r
,
w
of tarsus IV spiculiform (Figs
6
,
7
).
Figure 7.
Ingrassia chionis
sp. nov., legs
A
tibia and tarsus I of male
B
tibia and tarsus II of male
C
tibia and tarsus III of male
D
tibia and tarsus IV of male
E
tibia and tarsus III of female
F
tibia and tarsus IV of female.
Differential diagnosis.
The new species
Ingrassia chionis
sp. nov. belongs to a group of species associated with the
Charadriiformes
and is characterized by a retrograde spine-like apophysis on femorogenu II in both sexes (
Gaud 1972
;
Vasyukova and Mironov 1991
). Among this species grouping, the new species is most similar to
I. tringae
Vitzthum, 1922 (=
I. minuta
Gaud, 1972) described from
Calidris minuta
(Leisler) (
Scolopacidae
) in having the following features: in males of both species, the opisthosomal lobes are relatively short, equal to or slightly longer than wide at the bases, and the supranal concavity is completely separated from the terminal cleft; in females, the hysteronotal shield is shaped as a large longitudinal plate occupying the median area of the hysterosoma.
Ingrassia chionis
is distinguished from
I. tringae
by the following features: in both sexes, the prodorsal shield is narrow, parallel-sided, with the width about one-third the distance between setae
se
, and the posterior end of this shield is tapering; in males, the terminal cleft is semi-ovate, narrowed only in the anterior end, and tibia III bears a small apical spine of rectangular shape; in females, the anterior margin of the hysteronotal shield is right-angled and extends to the level of setae
c2
, and the posterior margin of this shield is truncate and extends to the level of setae
e2
. In both sexes of
I. tringae
, the prodorsal shield is a longitudinal plate widened posteriorly, with its greatest width equal to or larger than the halfway between setae
se
, and the posterior margin is widely rounded; in males, the anterior half of the terminal cleft is strongly narrowed, and tibia III bears a pointed apical spine; in females, the anterior margin of the hysteronotal shield is semi-ovate and does not extend to the level of setae
c2
, and the posterior margin of this shield is concave and extends beyond the level of setae
e2
.
Molecular data.
The COI sequences were obtained from two individuals and deposited in GenBank with accession numbers MZ489649 and MZ489650.
Etymology.
The specific name is taken from the generic name of the type host and is a noun in apposition.