Eye arrangements for Zora & Anahita can look similar. I'd say look for the stripes on the legs of Zora and the more broken pattern on Anahita.
are distinguished from the closely related species of Clubiona
by lacking a conspicuous dorsal groove in the midline of the carapace
, the lack of a cluster of long curved erect setae
at the anterior end of the abdomen, by having the first pair of legs the longest, and by having a long, pointed spur extending back from the cymbium
over the tibia
. Species of Cheiracanthium
are also characterized by having relatively thinner legs and more robust bodies than Clubiona
." From article by Jørgen Lissner seen here
have the dorsal groove, but also have brown markings on the carapace. They also almost always have two brown rows of spots running down the length of the abdomen.
The following are generally similar looking, but are easily told apart by looking at the length of the pedipalps
and the eye arrangements
. Some people might also confuse some cellar spiders
with these because they have the "violin" mark, but I don't think they look very similar. There is one more spider that has just been found in Florida, Cithaeron praedonius. You can see images here
While each of these three has its own distinct look their general appearance and coloring may confuse some people. Especially some Tibellus and Pisaurina can look very similar.
Coloring varies on these, especially in different lighting. The best way to tell these apart is to look at the eye arrangement
and the chelicerae
. Dysdera have only six eyes and very large chelicerae compared to Trachelas which has eight eyes and more normal sized chelicerae.
These are easy to tell apart if you get a good shot of the eye arrangement
. Modisimus have eight eyes and Scytodes have six.
Mimetus & A. miniatus
have similar markings, but Mimetus
has longer legs. These might also look similar to Modisimus & Scytodes
above. However Modisimus
has much longer, thinner legs & Scytodes
has thinner legs and a different eye arrangement. Metellina mimetoides
can also look very similar to Mimetus
. Look for the two white comma shaped marks on the anterior of the abdominal hump on Metellina mimetoides
, and look for the longer tibiae and curved femurs on Mimetus
Again eye arrangement
is key when pattern is not obvious.
The dorsal abdominal pattern of the following might be confusing, but D. triton
can be separated from the Pirata/Piratula
by the markings on the carapace. When seen in the field (not just an image) it's obvious that the Dolomedes
are much larger spiders.
Pirata or Piratula
Amaurobiidae, Amphinectidae, Cybaeidae, Dictynidae, Tengellidae, Zorocratidae
Both Cybaeidae and Amaurobiidae have eyes in two transverse rows with similar carapace shapes. SONA says that Cybaeidae differs from other families by spinneret characters (3 longitudinally arranged pairs), ventral tibial macrosetae (numerous and conspicuous) and smaller size (1-14 mm). In my opinion Cybaeidae may appear to have longer legs in relation to its body than Amaurobiidae.
M. simoni has three pairs of ventral macrosetae on tibia
in single row. Amaurobiidae does not have ventral macrosetae, so shots showing the ventral hairs (side views) will be valuable. I think I see the hairs on tibias III & IV of Lenny Vincent's image seen here
While the color and markings of some Cybaeopsis & Callobius
spiders look nearly identical the shape of the carapace is drastically different. Look for the wide front & eyes in the genus Callobius
Finally you can separate Cybaeus
from Cryphoeca exlineae
by looking for the white hairs on the abdomen of the latter and Grammonata can be separated by its less striped legs. Grammonata can also be separated from Meriola by its thinner legs.
The following look very similar, but the Plectreurys have thickened front tibia
or lateral apophyses
on the front tibia.
We aren't sure how to separate Phrurotimpus from the Liocranidae or whether they even look that similar. We may have some placed incorrectly in the guide. Some comments here
At this point we aren't sure how to separate Anyphaena
from the Agroeca
or whether they even look that similar. We may have some placed incorrectly in the guide. More research is being done. After reviewing the photos online my initial guess is that we're confusing live specimen patterns of Anyphaena
with dead specimen patterns of Agroeca
. I don't think that the patterns of Agroeca
are the same when the spider is living. Adding to the confusion is the possibility of juvenile specimen patterns looking completely different than the adults patterns.
Both spiders have a 'Steatoda look' and white mottling on the abdomen. T. gemmosum may have a different pattern of white. More images needed.
Between Enoplognatha & Zygiella (& Parazygiella) look for the heavier black line in the center of the abdomen of Enoplognatha. Also Enoplognatha pattern ends with a horizontal black line on the posterior of the abdomen.
Both groups of spiders can have green legs & green/tan carapaces with a stripe down the middle. Looking closely at the dorsal pattern can differentiate between these. Also, the hairs on Mangora's legs are thicker and longer and it is missing the dark line around the carapace that is found in Leucauge. Neriene can also be confused with these two.. see below.
Not sure on field marks yet. May be able to tell by spinnerets & eyes.
Hypselistes vs. Hypsosinga
Best clue is to record the spider's web type. Kyron has some new tips:
I think shape of the carapace may be enough to tell Hypselistes from Hypsosinga. Hypselistes seems to have a fairly typical erigonine face with AMEs closer together than PMEs, and a tall clypeus. The front looks pretty round when viewed from above, which I've also seen a lot in erigonines.
In contrast, my impression of Hypsosinga is that the AMEs and PMEs form a rectangular shape, the clypeus is kind of short, and the carapace is more cornered off at the front.
Finally I notice some difference in the chelicerae. Hypsosinga's just "look" Araneid in nature to me. I can't figure out quite how to describe it though.
Males of the following genera may be confused because of their constricted abdomens. However, Microlinyphia
males have a long wiry embolus that turns a full circle larger than the pedipalp itself; both Neriene & Microlinyphia
males have a much longer carapace than Coleosoma
**There are also some spiders that look more like other insects. Here is an example of a spider that looks like something in another order.
Obviously if you looks closely you'll see one is a spider, one is a broad-headed bug and one is an ant. However, they have similar coloring and shapes.