An EPT List for the Rapidan River (as of 7/14/13)

(It has to represent the Rapidan River: the common stonefly, Paragnetina immarginata, tolerance value 1.1.  It is one of 11 taxa that, to date, I have seen nowhere else.)

I have two sites in the Rapidan River in Madison County that I examine in a regular way: one is adjacent to the beginning of the Graves Mill Trail in the Shenandoah National Park, the other is .3 miles below that.  These are the sites seen in spring.

These are two of my favorites sites because of the quantity and quality of the insects I see.

Let me make a couple of comments on the list that's posted below.  1) The taxa I've seen nowhere else are highlighted in Bold (photos of the 11 are posted at the end of this entry).  They are: 1 and 2) the spiny crawler mayflies Ephemerella subvaria (TV undetermined -- too uncommon) and Telagnopis deficiens (2.6); 3) the pronggilled mayfly, Habrophlebia vibrans (0.3); 4) the common stonefly in the photo above, Paragnetina immarginata (1.1); 5-7) the Perlodid stoneflies Isogenoides hansoni (undetermined -- uncommon), Isoperla nr. holochlora (0.0) and Isoperla orata (0.0); 8) the Giant stonefly Pteronarcys biloba (0.0); 9) the common netspinner Ceratopsyche slossonae (0.0); 10) the humpless casemaker Micrasema charonis (1.0); and 11) the Northern casemaker, Pycnopsyche scabripennis (2.5).  The tolerance values, noted in Bold, are a good indication of the quality of this stream.  And 2) the families that are especially diverse in this stream are the small minnow mayflies -- 7 species, the spiny crawlers -- 5 species, the common netspinner genus Ceratopsyche -- 5 species,  and the Perlodid stoneflies -- 10 species.  The Perlodid stoneflies in the Rapidan River are very intolerant insects.
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                EPT Species List for the Rapidan River

                 

I. Ephemeroptera (Mayflies)

1. Baetidae (Small minnow mayflies)

1. Acentrella nadineae

2. Acentrella turbida

3. Baetis intercalaris

4. Baetis pluto

5. Baetis tricaudatus

6. Heterocloeon amplum

7. Plauditus dubius

2. Isonychiidae (Brushlegged mayflies)

1. Isonychia

3. Heptageniidae (Flatheaded mayflies)

1. Epeorus pleuralis

2. Epeorus vitreus

3. Leucrocuta hebe

4. Leucrocuta sp. (aphrodite?)

5. Maccaffertium ithaca

6. Maccaffertium pudicum

7. Maccaffertium sp. (modestum?)

4.  Ephemerellidae (Spiny crawler mayflies)

1. Ephemerella dorothea

2. Ephemerella invaria

3. Ephemerella subvaria

4. Serratella serratoides

5. Teloganopsis deficiens

5. Leptophlebiidae (Pronggilled mayflies)

1. Paraleptophlebia mollis
2. Paraleptophlebia guttata

3. Habrophlebia vibrans

 II. Plecoptera (Stoneflies)

1. Capniidae (Small winter stoneflies)

1. Allocapnia

2. Leuctridae (Needleflies)

1. Leuctra

3. Nemouridae (Forestflies)

1. Amphinemura

2. Prostoia

4. Taeniopterygidae (Large winter stoneflies)

1. Strophopteryx fasciata

2. Taenionema atlanticum

3. Taeniopteryx burksi/maura

5.  Chloroperlidae (Green stoneflies)

1. Sweltsa

6. Peltoperlidae (Roach-like stoneflies)

2. Tallaperla

7. Perlidae (Common stoneflies)

1. Acroneuria abnormis

6. Paragnetina immarginata

8. Perlesta

8. Perlodidae (Springflies and Stripetails)

1. Diploperla duplicata

2. Isogenoides hansoni

3. Isoperla dicala

4. Isoperla holochlora

5. Isoperla nr. holochlora

6. Isoperla montana

7. Isoperla orata

8. Isoperla nr. orata

9. Malirekus hastatus

10. Rememus bilobatus

9. Pteronarcys (Giant stoneflies)

1. Pteronarcys biloba

III. Trichoptera (Caddisflies)

1. Rhyacophilidae (Free-living caddisflies)

1. Rhyacophlia fuscula

2. Glossosomatidae (Saddle-case makers)

1. Glossosoma nigrior

3. Philopotamidae (Fingernet caddisflies)

1. Chimarra

2. Dolophilodes distincta

4. Hydropsychdae (Common Netspinners)

1. Ceratopsyche alhedra

2. Ceratopsyche bronta

3. Ceratopsyche morosa

4. Ceratopsyche slossonae

5. Ceratopsyche sparna

6. Cheumatopsyche

5. Brachycentridae (Humpless case-makers)

1. Brachycentrus appalachia

3. Micrasema charonis

6. Lepidostomatidae

1. Lepidostoma

7. Limnephilidae (Northern case-makers)

3. Pycnopsyche scabripennis

8. Apataniidae

1. Apatania incerta

 9. Uenoidae

2. Neophylax consimillis

10. Odontoceridae (Strong case-makers)

1. Psilotreta labida

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1. Spiny crawler mayfly, Ephemerella subvaria

2. Spiny crawler mayfly, Telagnopis deficiens

3. Pronggilled mayfly, Habrophlebia varians

4. Pronggilled mayfly, Paraleptophlebia guttata

5. Common stonefly, Paragnetina immarginata (pictured at the top of the page)

6. Perlodid stonefly, Isogenoides hansoni

7. Perlodid stonefly, Isoperla nr. holochlora

8. Perlodid stonefly, Isoperla orata

9. Giant stonefly, Pteronarcys biloba

10. Common netspinner, Ceratopsyche slossonae

11. Humpless casemaker, Micrasema charonis

12. Northern casemaker, Pycnopsyche scabripennis