(367DEsul) Deuterosminthurus sulphureus (Koch, 1840)
Deuterosminthurus sulphureus is a moderately common, uniformly yellow species that could have been confused with the yellow variety of Deuterosminthurus pallipes in the past. The fourth antennal segment (ant 4) is subdivided into seven subsegments (Fig. 1). Some of the setae on the outer side of the tibiotarsus of the third leg (leg3) are longer than others (Fig. 2). The mucro is spoon-shaped and, in males, long specialised backward-pointing setae are present at the posterior end of the sixth abdominal segment (Fig. 3). The female sub-anal appendages (SAA) are not expanded at the tip (Fig. 4). In females, the setae surrounding the anus are of different thickness (Fig. 5).
Fig. 1: Fourth antennal segment (ant4) divided into seven subsegments (1 to 7) of Deuterosminthurus sulphureus collected from Jeallotts Hill in July 1967 by Peter Lawrence.
Fig. 2: Tibiotarsus of the third leg of the same specimen of Deuterosminthurus sulphureus shown in Fig. 1.
Fig. 3: Furca (dens, mucro) and sixth abdominal segment of the same male specimen of Deuterosminthurus sulphureus shown in Fig. 1. Note the specialised pair of setae (spines).
Fig. 4: Sixth abdominal segment at two levels of focus of Deuterosminthurus sulphureus collected from Heddon on the Wall in June 1976 (collector not known). SAA, female sub-anal appendage.
Fig. 5: As Fig. 4, but at different depth of focus. SAA, female sub-anal appendage.