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Old 02-11-2010, 05:09 PM
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Default How many

Could someone please tell me how many of the Heptageniidae family in UK and Irish waters are of intrest to us fly fishers. Thanks .
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Old 02-11-2010, 05:48 PM
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I'll make a start: Worldwide there are 550 Heptageniidae species with 11 in the U.K.


Some are scarce, or have localised distribution, but most are fairly important to the angler. Identification is sometimes an issue but March Brown dressings and Large Brook Dun imitations will cover several.
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Old 02-11-2010, 06:45 PM
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The last time I looked at the UK list of Ephemeroptera it had the following species of Heptageniidae:

Rhithrogena germanica - Common; Anglers name: March Brown.

Rhithrogena semicolorata - Common; Anglers name: Olive Upright.

Kageronia fuscogrisea - Very rare, but said to be common in Ireland; Anglers name: Brown May Dun.

Electrogena affinis - Very rare; one recorded site at Ryedale, R. Derwent (added to the UK list in 1998); Anglers name: None known.

Electrogena lateralis - Common; Anglers name: Dusk Yellow Streak or Dark Dun.

Heptagenia longicauda - Very rare; Anglers name: None known.

Heptagenia sulphurea - Common; Anglers name: Yellow May Dun.

Ecdyonurus dispar - Common; Anglers name: August or Autumn Dun.

Ecdyonurus insignis - Uncommon; Anglers name: Large Green Dun.

Ecdyonurus torrentis - Common; Anglers name: Large Brook Dun.

Ecdyonurus venosus - Fairly common; Anglers name: Late March Brown.

Arthroplea congener - Very rare, only one record from 1920; Anglers name: None known.

So I make it 12 on the UK list but clearly the inclusion of A.congener is a bit shaky.

Ray

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Old 02-11-2010, 07:23 PM
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Oldbull, thank you, a comprehensive and faultless list.

Perhaps just one to disagree on: "Arthroplea congener no longer occurs in the British Isles. The only record is of a single adult male taken in 1920 at Stanmore, Middlesex. As a result, a voucher specimen is required for all records of this species."


I hope, as interest in angling entemology increases, that a previously undiscovered stronghold will be found, perhaps by kicksampling?


Quote:
Arthroplea congener

Nymphs: Flattened nymphs with broad heads. The eyes are large and placed on the back of the head. Long brush-like structures (maxillary palps) extend forward from the head.


Adults: Medium sized flies with two tails and large hindwings. The body is dark brown, almost black with each segment slightly paler on the sides and rear edge. Segments 2 to 8 have two dots on either side of the mid-line. The wings are slightly opaque, particularly in the lower half. The legs are brown to dark brown and the foot is much paler. The tails are a smoky grey colour with rings at the joint of each segment, particularly in the segments closer to the body.
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Old 02-11-2010, 07:51 PM
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Ephemerella
Thanks for that, will remove it from my list.


EDIT
Although your link shows Arthroplea congener no longer occurs in the British Isles, it is still shown on the UK list; but it's not a Heptageniidae so your original count of 11 is correct.


Ray

Last edited by oldbull; 02-11-2010 at 09:11 PM.
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Old 03-11-2010, 05:57 PM
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Quote:
Originally Posted by oldbull View Post


EDIT
Although your link shows Arthroplea congener no longer occurs in the British Isles, it is still shown on the UK list; but it's not a Heptageniidae so your original count of 11 is correct.


Thank you.

Yes it's in the Arthropleidae family and may be deleted from future lists.

Full list (for those interested) : The British Ephemeroptera



Quote:
Arthroplea congener Bengtsson, 1909 has only been recorded from the British Isles on one occasion. A single adult male was collected by R. South from Stanmore, Middlesex on the 4th June 1920. This record is now described as doubtful by many writers, and subsequently this species may not be included on future checklists of the British Ephemeroptera.

http://www.ephemeroptera.pwp.blueyon...s/interest.pdf

Mayflies of special interest to the Ephemeroptera Recording Scheme
The purpose of this short note is to provide information on two species of mayfly that are of particular interest to the Ephemeroptera Recording Scheme.
Heptagenia longicauda, is listed as a UK Biodiversity priority species, whilst if a population of Arthroplea congener was found this species would be probably merit inclusion in the Red Data Book of Insects.


I've detailed Heptagenida hatching habits on this section somewhere; so I'll try and add more plus somethig about the spinners later.
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Old 10-11-2010, 08:28 PM
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Thanks for the info and links guys. Very helpful.

Bill.
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