Allopsontus, Silvestri, 1911

Kaplin, Vladimir, 2018, A new species of the genus Allopsontus Silvestri (Archaeognatha: Machilidae) from the Eastern Kazakhstan, Zootaxa 4500 (4), pp. 508-516 : 514-515

Key to Allopsontus subgenera and to species from Kazakhstan

1 Ovipositor short, stout, apical divisions of gonapophyses with fossorial spines.................................... 2

- Ovipositor long, thin, distal divisions of gonapophyses without fossorial spines.................................... 6

2 Legs, maxillary and labial palps of male and female without long, thin setae. Urocoxites I–VII of male and female with 1 + 1 eversible vesicles (A. ( Aridopsontinus ) Kaplin, 2012). Line of contact of eyes slightly shorter than one-half length of eyes. Paired ocellus subelliptical, about twice as wide as long. Undersurface of articles 5–7 of male maxillary palp with numerous and short adpressed setulae. Ovipositor slightly surpassing apex of urocoxites IX.......... A. (A.) varvarae Kaplin, 2012

- Legs, maxillary and labial palps of male with long thin setae.................................................. 3

3 Urocoxites I, VI and VII with 1 + 1, II–V of male and female with 2 + 2 eversible vesicles... A. ( Machilanus ) Mendes, 1990

- Urocoxites I–VII of male with 1 + 1 vesicles; in female, I, VI and VII with 1 + 1, II–V with 2 + 2 vesicles....................................................................................... A. ( Anisopsontus ) Mendes, 1990 …4

4 Line of contact of eyes about two-thirds length of eyes. Paired ocellus subelliptical, about twice as wide as long. Ratio of male urostylus (without apical spine) to urocoxite IX about 1.0. Ovipositor not distinctly surpassing apex of urocoxites IX.............................................................................. A. (A.) ciliatus ( Wygodzinsky, 1970)

- Line of contact of eyes less than two-thirds length of eyes. Paired ocelli less than twice as wide as long. Ratio of male urostylus (without apical spine) to urocoxite IX more than 1.2. Ovipositor clearly surpassing apex of urocoxites IX................ 5

5 Line of contact of eyes about 0.60 length of eyes. Paired ocellus 1.2–1.3 times wider than long. Ratio of male urostylus (without apical spine) to urocoxite IX of male 1.2–1.3................................... A. (A.) pulchellus ( Kaplin, 1982)

- Line of contact of eyes 0.45‒0.50 length of eyes. Paired ocellus 1.6–1.8 wider than long. Ratio of male urostylus (without apical spine) to urocoxite IX about 1.5............................................... A. (A.) tekelensis Kaplin, 2015

6 Urocoxites I–VII of male and female with 1 + 1 eversible vesicles … A. ( Kaplinilis ) Mendes, 1990.................... 7

- Some urocoxites of female or male and female with 2 + 2 vesicles............................................... 8

7 Compound eyes rounded. Paired ocellus 2.0–2.4 times wider than long. Undersurface of articles 2–7 of maxillary palp and surface of articles 2 and 3 of labial palp of male with numerous short adpressed setulae...... A. (K.) dzhungaricus Kaplin, 1985

- Compound eyes slightly elongated. Paired ocellus narrowed, 3.0–3.5 times wider than long. Undersurface of articles 5–7 of maxillary palp of male with numerous short adpressed setulae. Labial palp of male without adpressed setulae............................................................................................ A. (K.) ilyai Kaplin , sp. nov.

8 Urocoxites II–IV of female, or male and female with 2 + 2 eversible vesicles..................................... 9

- Urocoxites II–V of female, or male and female with 2 + 2 eversible vesicles..................................... 10

9 Urocoxites I–VII of male with 1 + 1 vesicles; in female, I and V–VII with 1 + 1, II–IV with 2 + 2 vesicles (A. ( Allopsontoides ) Mendes, 1990). Compound eyes rounded. Line of contact of eyes about one-third length of eyes. Paired ocelli 2.2–2.4 times wider than long. Undersurface of articles 2–7 of maxillary palp and surface of articles 2 and 3 of labial palp of male with numerous short adpressed setulae................................................... A. (A.) simplex Kaplin, 1982

- Urocoxites I and V–VII with 1 + 1, II–IV of male and female with 2 + 2 vesicles.......... A. ( Allopsontinus ) Kaplin, 1993

10 Urocoxites I–VII of male with 1 + 1 vesicles; in female, I, VI and VII with 1 + 1, II–V with 2 + 2 vesicles (A. ( Anisoptinus ) Kaplin, 2015). Compound eyes rounded. Line of contact of eyes about one-third length of eyes. Paired ocellus 2.2–2.4 times wider than long. Maxillary and labial palps of male without adpressed setulae................ A. (A.) nigrus Kaplin, 2017

- Urocoxites I, VI and VII with 1 + 1, II–V of males and females with 2 + 2 vesicles … Allopsontus s. str. Silvestri, 1911.... 11

11 Compound eyes slightly elongated. Line of contact of eyes 0.42–0.45 times length of eyes. Paired ocellus 1.8–2.0 times wider than long. Maxillary and labial palps of male without adpressed setulae. Sensory field of fore femur of male underdeveloped, with 2–4 ramose sensilla........................................................ A. (A.) asiaticus Kaplin, 2014

- Compound eyes rounded or slightly widened. Line of contact of eyes less than 0.4 times length of eyes. Paired ocellus more than twice as wide as long. Maxillary palp of male with short adpressed setulae. Sensory field of fore femur of male developed, 0.3–0.5 times as long as femur.......................................................................... 12

12 Compound eyes rounded. Line of contact of eyes more than 0.3 times length of eyes. Labial palp of male without adpressed setulae............................................................................................. 13

- Compound eyes slightly widened. Line of contact of eyes about 0.3 times length of eyes............................ 14

13 Paired ocelli 2.9 times wider than long. Undersurface of articles 2–7 of maxillary palp of male with short adpressed setulae. Ratio of male urostylus (without apical spine) to urocoxite IX about 1.1.................. A. (A.) saryozeki Kaplin, 2015

- Paired ocellus 2.7–2.8 as wide as long. Undersurface of articles 3rd–7th of maxillary palp of male with short adpressed setulae. Ratio stylus (without apical spine) to urocoxite IX of male about 0.6..................... A. (A.) linnaeusi Kaplin, 2007

14 Paired ocelli 2.6–3.1 times wider than long. Undersurface of articles 5–7 of maxillary palp and 3rd article of labial palp of male with short adpressed setulae. Ratio of male urostylus (without apical spine) to urocoxite IX about 0.8................................................................................................... A. (A.) verae Kaplin, 2015

- Paired ocelli 2.1–2.3 wider than long. Undersurface of articles 2nd–7th of maxillary palp of male with short adpressed setulae. Labial palp of male without such setulae. Ratio of amle urostylus (without apical spine) to urocoxite IX about 0.9..................................................................................... A. (A.) kerzhneri ( Kaplin, 1982)