(022/HYsah) Hypogastrura sahlbergi (Reuter, 1895)

*schaefferi (Carl, 1901)
*schneideri (Schäffer, 1896)
*strenua (Brown, 1923)

Hypogastrura sahlbergi is a scarce species. The tibiotarsi of the legs each have only one clavate tenant seta and the empodial appendage of the foot possesses a lamella (Fig. 1). The dorsal side of abd5 has only two rows of setae (Fig. 2) and the ventral tube has at least 8+8 setae (Fig. 3). The fourth antennal segment is relatively well-endowed with sensillae (Fig. 4). There are specimens in the NHML collection which are definitely this species from 'Kew under Ivy', 'Chalet wall near Sheppey' and 'Beachy Head'. It is sure to be more common than records would indicate.

 

 

Map Hypogastrura sahlbergi
Third leg of Hypogastrura sahlbergi

Figure 1: Third leg of Hypogastrura sahlbergi found on a chalet wall in Sheppey in January 1966 (collector unknown). The empodium (emp) has a distinctive lamella.

abdominal segments of Hypogastrura sahlbergi

Figure 2: Fifth (abd5) and sixth (abd6) abdominal segments of the specimen of Hypogastrura sahlbergi shown in Fig. 1. There are only two rows of setae (anterior and posterior).

Ventral tube of the specimen of Hypogastrura sahlbergi

Figure 3: Ventral tube of the specimen of Hypogastrura sahlbergi shown in Fig. 1. There are at least 8 setae on each vesicle.

antennal segment of Hypogastrura sahlbergi

Figure 4: Sensillae (arrows) on the fourth antennal segment (ant4) of the specimen of Hypogastrura sahlbergi shown in Fig. 1.

Furca of the specimen of Hypogastrura sahlb

Figure 5: Furca of the specimen of Hypogastrura sahlbergi shown in Fig. 1.

 
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