Establishment of a new genus for Eresiomera paradoxa (Schultze, 1917) and related taxa (Lepidoptera: Lycaenidae) with description of two new species
Author
Sáfián, Szabolcs
Author
Collins, Steve C.
text
Zootaxa
2015
4018
1
124
136
journal article
10.11646/zootaxa.4018.1.7
76005db3-918f-40a0-831b-a0d9af3a57ac
1175-5326
238185
16A1C3C4-D996-4576-A882-E9EE37BE137D
Biogeography of
Parasiomera
Although the scarcity of all species in the genus (apart from
P. paradoxa
all other species are known only from a few specimens) make it difficult to assess accurate distribution, the known occurrences draw a clear biogeographic pattern, along which the members of the genus are most probably distributed.
FIGURE 8.
Known occurrences of
Parasiomera
. The locality of
P. paradoxa
in Congo could not be confirmed with existing voucher specimens, the possibility of its presence there is shown with a questionmark.
P. paradoxa
is the best known and probably the most widely distributed species. It was recorded in
Cameroon
,
Congo
(Central
Congo
),
Gabon
and
CAR
(ABRI collection,
Stempffer 1962
, Vande weghe 2010, ABDB: http:// www.abdb-africa.org). Virtually all records come from the Congolian (Central African) lowland forests, which indicates that its distribution could cover the entire
Congo
Basin even if there are no records known from the
DRC
, which otherwise covers the largest forested area in Central Africa.
As
the
type
locality of the species lies north of River Sanaga (Upper Cross River), it could also potentially occur in forested areas all way to the lower Cross River in Eastern
Nigeria
but as a partially canopy-dwelling species they could easily have escaped detection.
P. al f a
is known only from a single specimen, collected in Western
Liberia
. The habitat at the
type
locality does not indicate narrow endemism, as the hyper-wet and wet lowland rainforests are relatively widely distributed in the Liberian sub-region (between River Sassandra in
Ivory Coast
and Eastern
Sierra Leone
). However, the species will probably not be found outside of the sub-region, as this forest
type
does not occur outside of the area in entire West Africa (
Poorter
et al.
2004
).
P. alf
a
is best treated as a Liberian sub-region endemic species.
P. kivuensis
and
P. orientalis
might even prove narrowly endemic, as both of them were found in the Albertine Rift Region, which is outstandingly rich in endemic butterflies (
Plumptre
et al.
2007
).
P. kivuensis
was collected only in the mid-elevation or sub-montane forests west of the Albertine Rift (North Kivu area) and might be found only in this
type
of habitat, while
E. orientalis
is an eastern vicariant of
P. kivuensis
(morphologically they are definitely closer to each other than to the the other two species in the complex), found only in Kalinzu Forest, which could be characterised as eastern Albertine Rift mid-altitude outlier forest. Kalinzu, with the adjoining Kitomi-Kasyoha Forest and Maramagambo Forest form a long time isolated forest area, which can justify the speciation within
Parasiomera
in the region. The known records of occurrence are summarized on
Fig. 8
.