Trigoniophthalmus, Kaplin, 2019

Kaplin, Vladimir, 2019, Taxonomic review of the genera Trigoniophthalmus Verhoeff and Coryphophthalmus Verhoeff (Archaeognatha, Machilidae) with descriptions of two new species of the genus Coryphophthalmus from Serbia, Zootaxa 4661 (2), pp. 371-384 : 372

Trigoniophthalmus s. str.

Diagnosis. With 2 + 2 exsertile vesicles on abdominal segments II–V. Spine-like setae on the ventral surface of tarsus absent.

Description. Body length 8–12 mm. Hypodermal pigment on head and coxae. Compound eyes black, slightly widened. Paired ocelli black, submedian, close together, transverse, drop-shaped. Spine-like setae on the ventral surface of tarsus absent. Urocoxites II–V with 2 + 2 exsertile vesicles. Ovipositor shortened, not exceeding posterior angle of coxite IX, with 18–22 divisions. Anterior gonapophyses with long setae, divisions of posterior gonapophyses without setae ( Figs 5–8 ).

The subgenus includes one described species ( Table 1 ).

Figures

FIGURES 1–8. Trigoniophthalmus alternatus (Silvestri, 1904). 1, 2) Eyes and paired ocelli, front view. 3) Apical part of middle tarsus, with pretarsus. 4) Fore femur. 5) Urocoxite VIII, with anterior gonapophysis. 6) Anterior gonapophysis. 7) Urocoxite IX, with posterior gonapophysis. 8) Distal part of posterior gonapophyses. Figs. 1–5, 7, 8: females; Fig. 4: male. Figs. 1, 5–8 after Stach, 1958; Figs. 2, 4 after Wygodzinsky, 1941; Fig. 3 original, specimen from Sokobanja, Serbia. Scale bars: 0.1 mm.