(037/WLden) Willemia denisi (Mills, 1932)

*aspinata Stach, 1949

Records to date for Willemia denisi have all been under the name Willemia aspinata which was shown by Fjellberg (1985) to be a junior synonym. Willemia denisi is the only species of Willemia found in Britain and Ireland which does not possess two anal spines. The post-antennal organ (PAO) is relatively large with (usually) four lobes (Fig. 1). The foot possesses a small empodium (Fig. 2) and the fourth antennal segment (ant4) bears a number of teardrop-shaped sensillae (Fig. 3).

 

 

 

Map Willemia buddenbrocki
Four-lobed post-antennal organ of Willemia denisi

Figure 1: Four-lobed (1-4) post-antennal organ (PAO) of Willemia denisi collected from Arne Big Wood, Dorset in November 1963 by Peter Lawrence.

Foot of third leg of Willemia denisi

Figure 2: Foot of third leg (leg3) of Willemia denisi collected from Lightwater, Surrey in May 1951 (collector unknown). The empodium (e) is about 0.4 times as long as the claw.

Tip of antenna of Willemia denisi

Figure 3: Tip of antenna of the same specimen of Willemia denisi shown in Fig. 1. The fourth antennal segment (ant4) bears several teardrop-shaped sensillae, only one of which (s) is in the plane of focus of the photograph.

 
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