(080/PLasi) Pseudachorutella asigillata (Börner, 1901)

*silvaticus (Agren, 1903)

The largest specimen of Pseudachorutella asigillata in the NHM is a specimen from Belfast of 1.6 mm in length. The species is dark blue in colour and is characterised by the absence of a post-antennal organ (Fig. 1). There is no empodium on the foot (Fig. 2). The mouthparts protrude from the front of the head (Fig. 3) and the tips of the mandibles and maxillae are pointed (Fig. 4). The furca is well-developed (Fig. 5). 

Most records are from under bark although Pseudachorutella asigillata is also found under surface debris. Pseudachorutella asigillata appears to be moderately common and is probably widespread although it has yet to be recorded from Wales and mainland Scotland.

 

 

 

Map Pseudachorutella asigillata
Ocelli and post-antennal organ (PAO) of Pseudachorutella asigillata

Fig. 1: Ocelli (A-H) and post-antennal organ (PAO) of Pseudachorutella asigillata collected from Groombridge, Sussex in January 1957 by J.C. Deeming.

Foot of the second leg of Pseudachorutella asigillata

Fig. 2: Foot of the second leg of the same specimen of Pseudachorutella asigillata shown in Fig. 1.

Head of Pseudachorutella asigillata

Fig. 3: Anterior region of the head of Pseudachorutella asigillata collected from Kew Gardens in July 1961 by J.L. Gilbert. The mouthparts (mp) protrude forwards.

Mouthparts of Pseudachorutella asigillata

Fig. 4: Mouthparts of Pseudachorutella asigillata collected from Kew Gardens in August 1961 by J.L. Gilbert. The stipes (s), cardo (c), fulcrum (f), mandibles and maxillae have been dissected out of the head.

Furca of Pseudachorutella asigillata

Fig. 5: Furca of the same specimen of Pseudachorutella asigillata shown in Fig. 4).

 
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