Polyxenus lagurus Linnaeus, 1758

Polyxenus lagurus Linnaeus, 1758 View in CoL

Material examined: One female adult and two female subadults, collected in Munich ( 48° 09 ′ 50.7 ″ N; 11° 29 ′ 03.4 ″ E).

General features: Five ommatidia are located on the head, including one positioned laterally ( Fig. 3B View Fig /C). Two groups of setae are visible on the posterior vertex, each with 25 ± 2 setae (female adult), arranged in two rows with the six most distal setae of the anterior rows closely arranged into a fan-like structure ( Fig. 3C View Fig ). A single pair of setae are medially posterior to the posterior vertex. Tree trichobothria are arranged into a triangle

( Fig. 3B View Fig /C), the closest trichobothria to the posterior vertex is immediately adjacent to the last seta and is smaller than the other two trichobothria. On the 6th antennal article, six sensilla are located; on the 7th antenna article only five sensilla are visible. Tirty-two ± 4 setae are inserted on each side of the collum (female ad.; total 67), and four setae are inserted on the lateral protuberances

( Fig. 3B View Fig ). Tergites have two transverse rows of setae, with rosettes of setae laterally. Approximately 22 ± 2 ornamental setae are arranged into a fan dorsal to the caudal bundles.

Description of the mites

Two mites preserved in close proximity to the bristly millipede. One of the mites, SMF Be 1855b, is located close to the ventroposterior region of the millipede ( Fig. 1D View Fig ), with an apparent terminal hysterosomal pad-like organ. Te second mite, SMF Be 1855c, is entangled in the ornamental setae ventrally ( Fig. 1E View Fig ). Both mites have a conspicuous narrowing in front of legs 1, a protruding gnathosoma, body diamond-shaped and four pairs of legs.