Taxonomy of Central American water beetles in the genus Hydrochus Leach, 1817 (Coleoptera: Hydrochidae)
Author
Perkins, Philip D.
text
Zootaxa
2021
2021-05-21
4974
3
459
503
journal article
6214
10.11646/zootaxa.4974.3.2
5b4eaeb3-5722-4021-84ad-125ccd80855f
1175-5326
4777839
1BD6220B-7540-4A12-B3D2-5EDC1A3B7DD8
Hydrochus foveatus
Haldeman
Figs. 2
,
15, 16
,
36
Hydrochus foveatus
Haldeman, 1852: 375
;
lectotype
designation
Worthington
et al.
2016
.
Hydrochus monishi
Makhan, 1995
. Syn.
Worthington
et al.
2016
.
Originally described from Texas; the following are new locality records from
Mexico
.
Material examined (17)
:
Mexico
:
Nuevo Leon
,
10 km
N Linares
; ex. mercury vapor lite, elev.
430 m
,
22.iii.1991
, leg.
R. Brooks
,
R. Leschen
(3
SEMC
)
;
Nuevo Leon
,
Rio Ramos
,
19.vii.1968
, leg.
F. N. Young
(#2304) (1
NMNH
)
;
Rio Ramos
near
Allende
,
18.viii.1954
, leg.
F. N. Young
(1106) (1
NMNH
)
;
Siesta Motel
,
6 mi.
S. of
Monterrey
,
28.vi.1966
, leg.
R. E. Woodruff
(2
NMNH
)
;
San Luis Potosi
,
Ciudad Valles
,
22.viii.1964
, leg.
Paul J. Spangler
(1
NMNH
)
;
Clear
stream at
Palitla
,
5 mi.
N. of
Tamazunchale
,
22.xii.1948
, leg.
Hugh B. Leech
(1
CAS
)
;
Huichihuayan
,
25.ix.1938
, leg.
L. J. Lipovsky
(1
SEMC
)
;
Tamaulipas
,
5 miles
sse. of
Gomez Farias
,
19.vii.1970
, leg.
Shaffner
,
Hart
,
Murray
,
Phelps
(1
NMNH
)
;
Gomez Farias
,
3 mi.
W. El Encino
,
16.iii.1983
, leg.
M. S. Davis
(2
UMRM
)
;
Veracruz
,
9 mi.
W. Poza Rica
,
27.viii.1965
, leg.
Paul J. Spangler
(4
NMNH
)
.
Differential diagnosis.
Among Central American species, recognized by the combination of moderate size (ca.
3.50–3.56 mm
), the deep pronotal foveae, the large elytral tubercle of the 5
th
interstria, and the male genitalia (
Figs. 15, 16
; described below). This species has a generalized
Hydrochus
habitus; reliable determinations will require dissection of males. The male genitalia are distinct from other Central American species by virtue of the following combinations of characters: genitalia large, paramere tips sagittate, adtl very near apex of aedeagus, aedeagus wide, pseudoparameres large.
Male genitalia (
Figs. 15, 16
). General characters: paramere tips sagittate, plsa prominent, narrower at very tip end in lateral view than in dorsal/ventral views, in dorsal/ventral views with medial margins at apex parallel or nearly so, then arcuate away from midline; aedeagus in dorsal/ventral views lanceolate, very wide at agw, at ca. midlength; in lateral view slightly narrower, without emargination where adbl and shaft meet; lateral margins of aedeagus sclerotized; basal piece slightly shorter than parameres, in dorsal/ventral views tapering from distal to proximal, in lateral view dorsal surface arcuate, ventral surface straight, orifice strongly sclerotized.
Dorsal surface: pdmm moderately widely separated, slightly sinuate, overlapping aedeagus; adbl very small; adtl subapical.
Ventral surface: pvmm approximating lateral margin of aedeagus; avtl at ca. proximal 1/3.
Remarks.
The
one specimen
in the LeConte collection at the MCZ, a female, was designated
lectotype
by
Worthington
et al.
(2016)
. Images of the habitus and labels of this specimen are given herein (
Fig. 16
). The specimen imaged (
Fig. 15
) has this locality data:
Nuevo Leon
, Rio Ramos near Allende,
18.viii.1954
, leg. F. N. Young.