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NEPTICULIDAE : Nepticulinae : Nepticulini
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04.062 Stigmella samiatella (Chestnut Pigmy)
ws: 5-7mm; bivoltine Jun, Jul-Aug; leaf mine in oak (Quercus spp) Jun-Jul, Sep-Oct; pRDB woodland in S & SE.England
Stigmella samiatella §1 male
ID: Keyed in MBGBI1 with a yellow frons but judging from web images labelled as this species the dark-headed form is more usual:
Forewing without pale markings; terminal cilia not white; head black or blackish-brown > 6 species
In male S.atricapitella/ruficapitella the hindwing has androconial scales in the cilia (not seen in these specimens).
S.minusculella/spinosissimae lack the purplish tinge at the forewing apex. S.anomolella f.fletcheri has an abrupt transition to the purple apex.
Female S.atricapitella has the frons ochreous contrasting with a dark bronzy brown forewing base. S.tiliae has the frons black contrasting with a pale bronzy-brown forewing base and does not occur in E.England. In the dark-headed form of S.samiatella the frons is concolorous with the forewing base.
Male genitalia: not illustrated or described in MBGBI1 for any of these species. S.atricapitella/samiatella only shown at dissection group. S.samiatella shows a series of fine cornuti along the length of the aedeagus with a cluster of more robust cornuti at its apex. (imaging individual cornuti is beyond the resolution of my photographic equipment but the clusters can be clearly seen in the images below).
Forewing without pale markings; terminal cilia not white; head black or blackish-brown > 6 species
In male S.atricapitella/ruficapitella the hindwing has androconial scales in the cilia (not seen in these specimens).
S.minusculella/spinosissimae lack the purplish tinge at the forewing apex. S.anomolella f.fletcheri has an abrupt transition to the purple apex.
Female S.atricapitella has the frons ochreous contrasting with a dark bronzy brown forewing base. S.tiliae has the frons black contrasting with a pale bronzy-brown forewing base and does not occur in E.England. In the dark-headed form of S.samiatella the frons is concolorous with the forewing base.
Male genitalia: not illustrated or described in MBGBI1 for any of these species. S.atricapitella/samiatella only shown at dissection group. S.samiatella shows a series of fine cornuti along the length of the aedeagus with a cluster of more robust cornuti at its apex. (imaging individual cornuti is beyond the resolution of my photographic equipment but the clusters can be clearly seen in the images below).
Dissection
Male genitalia
Female genitalia
§1 Strumpshaw Fen, Norfolk; 24/08/2012; male; fw 2.8mm
§2 New Forest, Hampshire; 31/08/2013; male; fw 2.5mm
§3 Westcliff-on-sea, Essex; 15/07/2014; female
§4 Foulden Common, Norfolk; 14/08/2016; male
All images © Chris Lewis
§2 New Forest, Hampshire; 31/08/2013; male; fw 2.5mm
§3 Westcliff-on-sea, Essex; 15/07/2014; female
§4 Foulden Common, Norfolk; 14/08/2016; male
All images © Chris Lewis
Page published 14/02/2013 (§1) | §2 added 15/11/2013 | §3 (female genitalia) added 21/07/2014 | §4 added 19/04/2017
