Type designations for Neotropical water beetles in the genus Hydrochus Leach 1817 (Coleoptera: Hydrochidae)
Author
Perkins, Philip D.
text
Zootaxa
2019
2019-11-27
4701
2
149
167
journal article
24789
10.11646/zootaxa.4701.2.2
2254e402-c6b6-4b90-95d8-587e979af76f
1175-5326
3557927
69045F2D-1E16-427B-939E-9F0A6D047D05
Hydrochus metallipes
Knisch
Figs. 6
,
13A
Hydrochous metallipes
Knisch 1920: 56
.
The RBINS kindly provided eighteen
syntypes
of
Hydrochus metallipes
Knisch
, which are part of the Orchymont/ Knisch types collection. The
syntypes
consist of both males and females. I have selected one of the males, a specimen in good condition, to serve as
lectotype
, have labeled it such, and have imaged the habitus, male genitalia and labels of this specimen (
Figs. 6
,
13A
). The seventeen non-lectotype
syntypes
have been labeled as
paralectotypes
.
Lectotype
labels (
Fig. 13A
): “Bras.Corumba [Matto Grosso] // det. Kniž
metallipes
m. // Coll. A.Knisch TYPUS // coll. A. d’Orchymont:
Hydrochus
R.M.H.N.B. 15.962 // TYPE // HABITUS/GENIT. DIGITAL IMAGES captured 2019 P.D. Perkins // [red]
LECTOTYPE
Hydrochus metallipes
Knisch
desig. P. D. Perkins //
Hydrochus tarsalis
Chevrolat, 1863
, det. P. D. Perkins, 2019.” The male genitalia of the
lectotype
of
Hydrochus metallipes
Knisch 1920
does not differ significantly from the male genitalia of the
neotype
of
Hydrochus tarsalis
Chevrolat 1863
.
H. metallipes
is therefore reduced to status of junior synonym of
H. tarsalis
Chevrolat.
Remarks.
Oliva (1992)
published a drawing of the male genitalia of, supposedly,
H. metallipes
. The parameres are depicted as having a more pronounced enlargement of the medial margin than is present in the
lectotype
, or in all specimens of
H. tarsalis
for which the male genitalia have been examined.
Oliva (1992)
did not give the locality data of the specimen that was used to make the drawing.