New species and subspecies of Octavius from South Africa, with a key and additional distribution records (Coleoptera: Staphylinidae: Euaesthetinae)
Author
Janák, JiĜí
text
Acta Entomologica Musei Nationalis Pragae
2014
2014-04-30
54
1
195
231
journal article
10.5281/zenodo.5299545
0374-1036
5299545
D94600BD-1221-47B6-9C70-BA8C82B74CEC
Octavius multisetosus
sp. nov.
(
Figs 3
,
42–45
,
54
)
Type
locality.
South Africa
,
Eastern Cape Province
, Fort Fordyce NR, 32°40ƍS, 26°29ƍE.
Type material.
HOLOTYPE
: 3: ‘
SOUTH AFRICA
,
Eastern Cape
,
Fort Fordyce
NR
, indig. forest, 32°40ƍS, 26°29ƍE, sifting,
1.xii.2009
,
J. Janák
lgt. //
Octavius multisetosus
sp. n.
,
J. Janák
det. 2011’ (
TMSA
)
.
PARATYPES
: 73312
♀♀
, same data as
holotype
(
1 spec.
in
TMSA
,
1 spec.
in NMPC,
17 spec.
in
JJRC
).
Description.
Body length
1.9–2.5 mm
(M
2.3 mm
, HT 2.0 mm), forebody length
0.9–1.1 mm
(M 1.0 mm, HT 1.0 mm). Macrophthalmous, apterous, reddish-brown, head dull, pronotum slightly shiny, elytra and abdomen moderately shiny.
Head distinctly narrower than pronotum (R 0.83–0.89, M 0.86, HT 0.88), eyes moderately large, temples less than twice as long as eyes (R 1.24–1.66, M 1.48, HT 1.42), straight, rounded posteriorly, median impression on disc absent, lateral parts of head moderately granulose, median part very densely and ¿nely reticulate.
Pronotum distinctly broader than long (R 1.14–1.23, M 1.18, HT 1.14), strongly narrowed posteriorly; anterior angles slightly angular, dorsal impressions shallow, transverse impression deep, lateral impressions deep and delimited by a sharp longitudinal ridge laterally; lateral parts beside lateral impressions densely granulose, remainder of surface ¿nely granulose, moderately densely and deeply reticulate.
Figs 42–47. 42–45 –
Octavius multisetosus
sp. nov.
, male. 42, 44, 45 – HT; 43 – PT. 46, 47 –
O. sarkae
sp. nov.
, HT male. 42 – aedeagus ventral; 43 – apical part of aedeagus ventral; 44, 46 – sternite 8; 45, 49 – sternite 9. Scale bars = 0.1 mm.
Elytra subquadrate, much broader than long (R 1.48–1.64, M 1.57, HT 1.56), with a sharp longitudinal ridge laterally; irregularly granulate without distinct reticulation.
Male. Sternite 8 emarginate in posterior sixth (
Fig. 44
), sternite 9 as in
Fig. 45
. Aedeagus strongly sclerotised, (n = 5, length
0.56–0.61 mm
, M
0.59 mm
, HT
0.61 mm
), with asymmetrical median lobe. Internal structure of aedeagus with a long, apically narrowed band with a ¿eld of short scales. Parameres enlarged apically, with numerous setae in apical part (
Fig. 42
).
Variability.
Apical part of aedeagus of most specimens with narrowed but broadly rounded prominence (
Fig. 42
), in
two specimens
with sharp prominence apically (
Fig. 43
).
Differential diagnosis.
Octavius multisetosus
sp. nov.
belongs among species with large eyes, with the temples at most twice as long as eyes, with the head not or at most slightly widened posteriorly, with large body size and the disc of the head without a median impression. It is related to
O. ndumu
sp. nov.
, from which can be distinguished only by the aedeagus morphology – it is characterized by the median lobe markedly asymmetrical, with slender apically narrowed internal structure with a row of setae and apically widened parameres with several setae.
Etymology.
This species is named after the multisetose parameres (
multi
+
setosus
= having many setae). Adjective.
Bionomics.
All specimens have been found in siftings of forest litter among small roots at the base of large trees near a brook in indigenous forest.
Distribution.
Octavius multisetosus
sp. nov.
is currently recorded only from Fort Fordyce NR in
Eastern Cape Province
,
South Africa
. It occurs at the same locality with
O. bicurvatus
sp. nov.
(
Fig. 54
).