(368HSbil) Heterosminthurus bilineatus (Bourlet, 1842)

 *cornutus (Stach, 1956)
*coronatus (Bagnall, 1921)

 

The empodium on the foot of Heterosminthurus bears a prominent lamella (Figs. 1, 2, 3). The fourth antennal segment (ant4) is subdivided into about six subsegments (Fig. 4). In Heterosminthurus bilineatus, the longest setae on the inner side of the dens are about half as long as the mucro (Fig. 5). In males (Fig. 6), there are some pointed, thickened setae between the eyes (Fig. 7). The female sub-anal appendages are not expanded at the tip (Fig. 8).
Heterosminthurus bilineatus is yellowish in colour with longitudinal bands of purple pigment. The species is moderately common but has not been recorded from Wales or Ireland.

 

 

 

Fig. 1: Foot of third leg of Heterosminthurus bilineatus collected from Jealotts Hill in May 1968 by Harold Gough. The preparation of the slide by Gerhard Bretfeld is exquisite.

Fig. 2: Foot of first leg of the same specimen of Heterosminthurus bilineatus shown in Fig. 1.

Fig. 3: as Fig. 2 (but different focus).

Fig. 4: Fourth antennal segment (ant4) of the same specimen of Heterosminthurus bilineatus shown in Fig. 1.

 

Fig. 5: Furca of the same specimen of Heterosminthurus bilineatus shown in Fig. 1. The setae on the inner side of the dens (*) are about half the length of the mucro.

Fig. 6: Posterior abdomen of the same specimen of Heterosminthurus bilineatus shown in Fig. 1. The male genital plate is on the ventral side of the fifth abdominal segment.

Fig. 7: Head of the same specimen of Heterosminthurus bilineatus shown in Fig. 1. The thickened setae between the eyes are pointed.

Fig. 8: Posterior abdomen of a female Heterosminthurus bilineatus collected from Jealotts Hill in May 1968 by Harold Gough (slide prepared by Gerhard Bretfeld). The Sub Anal Appendages (SAA) are not thickened at the tip. The female genital plate is on the ventral side of the fifth abdominal segment

 
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