On tlre Identity of Hydroporus leaond,eri l. Sahlb.

(1)

On tlre Identity of Hydroporus leaond,eri l. ^Sahlb.

(Col. Dytiscidae)

By LARS HUGGERT

Sk。lgatan 100,S‐902 46 Umea,sweden

Abstract

HuccERr, I-. On the identitl' of

Hgdtoporus

le

utnderi J. Sahlb. t(iol. I)1'tiscidael.

- ^Ent' 'l'itlskr.

_95:

148-150.

1974.

Tlre identitl' of Hydroporus

leuanderi J. Sahlb.

is

discusscd

and a ^lectotype

^selected.

^There

^is

no doubt that H.

leuaruleri

is a distinct

species.

The characteristics

by'w'hich it

may be separated

from Il.

glabriusculus Aub6 are given.

About four

]'ears ago

T.-li. Iingelmark found

in the vicinitv of Jokkmokk (Lule Lapp- mark) a lather small dark and shinl' Hgdro- porrr.s. rvhich could Irot be properlv

deter-

mined. Accolding to current handbooks

the

slrecies rarr to H. glabriuscrrlrrs Aub6, but it seemed to differ from that ^species in

^some

features, especiallv the male genitalia

^seemed

to be quite different (G. Falkenstr6m, Ent.

l'idskr. 49: 155-161, 1928), so Engelmark came to the conclusion that it could be

^F/.

leuanderi J. Sahlb. He sent some

specimens

to S. Persson, Landskrona, rvho came to

the same

result.

In 1929 W. ^Hellen ^(Notulae ^ent. ^9:36)

carne to the conclusion that leuanderi

most

probably is onlv an immature and

somervhal

irberrant form of glabriuscrrlus. OIr the

t1'pe

specimens, rvhich I have been able to studl', due to the ^kindness of Kand. H. Silfverberg, Helsinki, there are :rlso labels rvith "glabrius- culus Aub6, Hell6n det." A. Zaitzev

(Fauna

USSR 4: 156, 1953) rvas of the

same

opinion

as IIell6n, but A. Zimmermann

regarded

lewrnderi

as

a distinct species (Bestimmungs- Tabellen del eurol;iiischen Coleopteretr, Heft

l0l: 9,

1931).

Ent. Titlskr. 95' 1974' 3 - ⁴

A solution of the problem lvas

rendered

rnore difficult by the fact that the type

speci-

mens are all females, so it ^rvas not

possible

to compare the male genitalia of the trvo forms. In the Srvedish material, ^holvever, there are some males. Thel' have the

^geni-

talia quite distinct from those of glabrittsctt-

Iu.s,

and I have now also seen male

speci-

mens from coll. Lindberg, Helsinki, ^rvhich agree rvith the Srvedish ones, although thel'

have become

lighter in

course

of time.

Thanks to Dr. T. N1'holm, Stockholm, I have been able to cornl)are my material of leuanderi rvith a collection of glabriusculus from Norrval',

Srveden

and Finland. ^rrVithout

any hesitation I regard m]' material

as

identical lvith the

t1'pes

of leuanderi, rvhich is a ^good

species

and may be separated from glabriu.t:culus

b1'

the differences given

belorv.

Hgdroporus leuanderi J. Sahlb.

Hgdroporus l.euanderi J.

Sahlberg, 1888,

\Ieddn

Soc. Fauna

Flora fenn.

15:221.

Irr general build verl' similar lo ^H. ^glab-

rirrscrrlus, but ^fresh ^specimens ^are

^ahva-vs

deep black rvith a faint metallic ^gloss

and

(2)

()N THE IDENTITY O「

HYDROPORUS LEVANDERIJ.SAHLB.

149

Ｗｈ撫４

ＩＪ

″ Ｊロロ

”

︲

︱

︱が

l.'igs. 1-6. IIlldroporus

glabriusculus

Aub6. \Iale genitalia ^(11;

^post-coxal

sutures

(l)); puncturation on elvtra

(5).

Hgdroporus leuuruleri J.

Sahlb.

llale genitalia (2); post-coxal

sutures 1{);

puncturation

_on

elytra

^(6).

more shilr)'; legs and antennae as itr ^glc-

brirrscrrlu.s; bodl'gives a more arched

and

bloader implession with the hairs on ^plor)o- tum and el1'tra slightlv shorter and not

so

conspicuous; sides of l)ronotum slightll'

^less

alched and microsculPture verv similar but not quite as deeply engraved as in glnbrius- crrlrrs, especiall]' on pronotum, rvhich

is

lather dull in the latter'; densitv of micro- Puncturation on elr'tra about equal in

the

trvo species, but leunndeli has much larger

and deeyrer punctures (figs. 5-0) ,

^yrost-

coxal sutures lather variable,

somervhat

nalro\yer and not diverging as much as in lqlabriuscLrltts (figs. 3-1), but this feature

is far fl'om being as important as

supposed

lr)' Zimmerman. \Iale genitalia constantlv different in the trvo species (figs. 1-2).

Material examined

ltt Zool. Mus. Helsinki, Finland.

Lectotl'pe, ?. ln lather good condition, glued to a card and labelled "Varsuga",

"Levauder", "Spec. t1'p.", "\Ius. Zool. H:fors, sl)ec. tvp. No 79, Hvdroporus levanderi

J.

.Sahlb.", "glabriusculus Aub6, Hell6n det."

and bearing mv lectotvpe label.

- ^One ^?

ca6-9 -c'

6

glued to a card, in poor condition, part of abdomen lost, and labelled "Varsuga", ^"Le- vander", "spec. tvp.", ^"Mus. Zool. H:fors, Spec. t1'p. No 80, Hvdroporus levandeli

^J.

Sahlb.", "glabriusculus Aub6, Hell6n ^det.", and 's.ith mv determination label.

- ^Oue ^?

glued, rvith abdomen lost, and labelled "Ku- s{rnren", "Levander"', "}Ius. Zool. H:fols, Spec. t1'p. No 367, levanderi J. Sahlb.,

J.

Sahlberg det.", and lvith mv determinutiou label.

- ^One d ^glued, ⁱⁿ ^good ^condition ^s'ith

genitalia mounted on a microslide, rvhich

is

on the pin, labelled "Kuopio", "Ler':rrttler",

"levanderi J. Sahlb., J. Sahlberg det.",

and

s'ith nrv detelmination label.

- ^One ⁶

^glued,

in ^good condition rvith ^genitalia on :r

tnicr'o-

slide on the pin, labelled "Fennia Lps, Lutto, Platonoff", "Ooll. Lindberg", and rvith

ruv

determination label.

- ^One d ^glued, ⁱⁿ

^good

condition and labelled

as

the

pt'evit)us one.

(hre 6 ^remounted ^bv ^me ^on a clrtl, ^rvith -

antennae bloken, labelled "Lapp.", "F.

Sahl-

berg", and rvith mv deternrination

label.

In Coll. Huggert,

Umeir, Srveden.

Vri

^s

te rbott en: Umeri 27.t'.1967 ?:

^26.

v.1970 2 6 6, ⁴ ??; ;10.r'.1971 d, ^z ?? ^(r.

Huggert).

N o

rrbotten: Haparandasand- skrir 24.r'r.1972 I 6 6,

⁺

?? ^(L. ^Huggertl.

5

″″′ 7'イ、ス′ ,うノ^ll'ψ 3 `

(3)

150

LARS HUGGERT

llcokrgl'

'l'hc spccinrens l'roln nt'ar .krkktn<lkk

rvere

foun<l in a sntall tarn (deatl-icc kettle) on

a

pint' nroor'. 'l'he trrn \ras vel'\' shallorv rvith

tht' lrottonr covt't'etl rvith Polytrit'1tttrn,

bc-

caust' it ^trsuallv rlricrl trp in ttritlstttnurt't', itlrd

tht'

t'<lgt,s

s'erc lrordelctl br- a thin belt of

(.arc.r'.

l)oruinatirrg spt'cics Ncr'(': Hlldroporus rt<'trtrtttgrtltts'l'1r.. H. rrr/'i/rorrs I)ft.,

^.{grrDtts

tiqrortcrtt'tts I'lr. tntl Hcloplutrus

ccl(ltrls Slrrr

t'p

^t/rtyrTrrrttit tts

'l'lt.

_t_.

\car Unreri. in the dt'lta of thc llivel

Unre-

iilvt,n. thc

spt,cit,s

livcrl in old pt'at-hags rvith alurost no vegt,tatiorr anrl rvith tlalk

^rvatct'.

'l'he _pools rvcrt'shatlt'tl. sut't'otuttlt'<l lrv

a

ritthel srvanrllr- nrixt,<l alder'-spnrcc

Iorest.

\\'ater lreellt's tr'pical of the loculitr''s'crc:

Ilqdrolxtrus

7ralrr.slri.s

L., H. striokr Glll.,

H. trt'glecttts Schaunr. -lgrtbtrs rtigroru'nt'tts

I'1r..

.{. rr//irris l']avk., HydroDitr.s ltrs<'i2cs

^L.,

H.

lus<'i1tt's

srrDrolrrrrrlrrs Stt'ph. und Hclo- plutrrts llroiprs ^l:.

On 2{th ,ltrnt', 1972. I ^paverl l shot't

r-isit

to thc islantl of Ilapalanrla sundskiir in

compan\' lvith S. Lundberg and K.

Perssou.

At that localitl' rve found leuanderi in

^,.r

rather large, \'erv shallorv temporarv pool rvith clear rvater. The pool

rvas

more or

less

coveled rvith

Carc.r:

altd situated in a rathel open park-lilte rvood of aspen, alder, birch, rvillorv, rorvan and \yild cherrv. The domi- nating speties were the same as at

Umeil,

lrut there rvere also some others, e.9., Bero- srrs luridrr.s L., Hgdroporus rulilrons Dft.

and. ITelophorus pallitlrts Gebl. There

rvere

also sonte sllecimens of -4gnbus biguttultrs

l'h., a ^species I had been lool<ing for for

vears.

Finallr', Engelmark met rvith leuanderi again in Finland, Enare Lappmark,

some

trventv kilometels south of Ivalo,

3.vII.1973.

Here it lived in a tundra biotope in a

tempo-

ralr' pool rvith no free ^rvater'. The ^animals rvere found in the Polgtrichum knolls

and

rvere not seen until the moss rvas

plessed

dorvn under rvater. This hahit of living in thick tnoss-mats rvith no open lvater to

^be

seen is in fact very typical of most of

the

nolthern

d1'tiscids.

E″′ r'(7s/1″ '5 7,ア

` 3-`

On tlre Identity of Hydroporus leaond,eri l. Sahlb.