by Jerzy Proszynski 1990
Euophrys
nearctica Kaston, 1938
[Fig. 16]
Euophrys
nearctica
Kaston 1938c: 187 T.
Euophrys nearctica: Proszynski 1976: ff. 100,
Material:
1 F "Euophrys
nearctica Kaston,
1938. TYPE" "Old Orchard, Me, 26 Aug. 1937.Coll.
D. S. Riggs". Coll. MCZ.
Measurements:
CEPHALOTHORAX in mm in % of L cphth.
| F in mm | F in % of L. cphth |
|
| Length cphth. | 1.70 | 100 % |
| L. e. f. | .77 | 45 % |
| HEight cphth. | .80 | 47 % |
| Width eye field at eyes I | 1.14 | 67 % |
| Width eye field at eyes III | 1.14 | 67 % |
| Width of cephth. at e. III | 1.21 | 71 % |
| Max. w. cphth | ||
| L. flat surf. cphth | .25 | |
| L. of ABDOMEN | 2.09 | |
| Max. width of ABDOMEN | 1.41 |
Length
of LEGS in mm
| F - Leg I | F - Leg II | F - Leg III | F- Leg
IV |
|
| tarsus | .37 | .34 | .43 | .55 |
| metatar | .45 | .42 | .61 | .92 |
| tibia | .55 | .45 | .55 | .87 |
| patella | .55 | .50 | .49 | .57 |
| femur | .86 | .76 | .98 | 1.21 |
| Total of 5 segments | 2.78 | 2.47 | 3.06 | 4.12 |
| Total in % of
|
100 % | 89 | 110 | 148 |
Colour
pattern
Remark: There are no clear cut color differences with Euophrys
monadnock, these visible may be due to
50 years longer preservation of the holotype of
Euophrys nearctica;
whilst there are also no distinct differences in size and proportions, the
only valid difference is in external structure of epigyne.
However, the external differences, especially sclerotized
ridge leading to copulatory opening may be not visible
of less sclerotized epigyne.
The best character should be the details of internal structure of epigyne, however I could not study these on the single specimen
known to science .
FEMALE.
Cephalothorax: pure light brown (whilst Euophrys
monadnock has some olive greyish
hue), slightly lighter dorsally, sides darker, eye field darker brown, presumably
black in fresh specimens; dark ventral edge; sparse, minute colorless setae
scattered over anterior eye field and part of thorax, in other areas presumably
lost; no contrasting color pattern. Abdomen: there is indistinct
and irregular pattern of delicate greyish brown
network with weak median streak of similar color consisting of a number of
fused triangles, followed on both sides (and separated from network) by a
chain of light spots - a typical pattern for many Euophrys
species and comparable with Euophrys monadnock, in which however the background is much darker
and the spots clearly delimited, instead of a network are rather lines of
small light spots; sides are lighter; it is not certain to which degree these
differences are due to the post-mortem changes and fading during years of
preservation. Frontal aspect: eye field and immediate surrounding
of eyes I dark, rims of eyes I with indistinct and sparse whitish setae, more
visible dorsally, clypeus brown with darker rim, almost bald, with a few inconspicuous
dark setae; chelicerae light brownish grey, pedipalps
yellow with tarsus and tibia darker yellow. Legs
I brown with lateral surfaces of metatarsus, tibia and patella darker, only
indistinctly lighter dorsally; tarsus, patella dorsally and femur ventrally
much lighter yellow. Remaining legs deep dark yellow. Leg I: metatarsus with two
pairs of ventral spines, longer than the segment itself, tibia with three
pairs of ventral spines. Ventral aspect:
coxae dark yellow like legs, sternum light brown with darker
rim, median area of abdomen behind epigastric furrow
uniformly grey, separated by indistinct
lighter dots from prey network pattern of sides; surfaces of lung-books strikingly
darker, dark grey; they were as dark in Euophrys monadnock
where remaining part of abdomen were also as dark. Epigynum
resembles E. monadnock, however the spermathecae seems larger in comparison with length of channels
and width of their loop; the most striking difference is the course of sclerotized
ridge arriving at sclerotized median plate of the
copulatory opening directly from behind, after making
almost a complete circle (fig. 16), in Euophrys
monadnock it makes only anterior half a
circle (on preparation it looks like rather one and half a circle) and arrive
from side; these details could be seen externally only on well sclerotized
epigyne.