Pachylaelaps (Longipachylaelaps)

Mašán, Peter, 2017, Four new species of the subgenus Pachylaelaps (Longipachylaelaps) from Italy, with a new identification key to the known species (Acari: Pachylaelapidae), Zootaxa 4236 (1), pp. 95-117: 115-116

publication ID

https://doi.org/10.11646/zootaxa.4236.1.5

publication LSID

lsid:zoobank.org:pub:04D3145C-1C8A-4AE7-968F-7F307E1E732A

persistent identifier

http://treatment.plazi.org/id/03DD87E1-2E12-C479-A69E-FA2BFA3167F3

treatment provided by

Plazi

scientific name

Pachylaelaps (Longipachylaelaps)
status

 

Key to known species of the subgenus Pachylaelaps (Longipachylaelaps)  (males)

1. Dorsal setae J5 more than 3.5 times shorter the setae J4.......................................................2

- Setae J5 less than 3.5 times shorter the setae J4..............................................................6

2. Both projections on palptibia tapered distally.............................................................. 3

- At least one palptibial projection with rounded distal margin.................................................. 4

3. Palptibial projections with divergent contiguous sides; larger projection produced into needle-like structure; spermatodactyl relatively shorter, less than twice as long as movable digit (spermatodactyl length/movable digit length 1.5–2); length of dorsal shield 870–950 µm......................................................... P. (L.) bocharovae Koroleva, 1978 

- Palptibial projections with parallel contiguous sides; larger projection regularly tapered, with obtusely pointed apex; spermatodactyl relatively longer, more than twice as long as movable digit (spermatodactyl length/movable digit length = 2.5); length of dorsal shield 710–780 µm.................................................. P. (L.) sublongisetis Koroleva, 1977 

4. Smaller palptibial projections with rounded distal margin; larger palptibial projection regularly tapered and with obtusely pointed apex, often with sail-like subapical lateral structure; spermatodactyl relatively shorter, less than twice as long as movable digit (SL/MDL 1.8–2); length of dorsal shield 745–900 µm........................ P. (L.) perlucidus Mašán, 2007 

- Smaller palptibial projections with tapered distal margin; larger palptibial projection with rounded distal margin; spermatodactyl relatively longer, more than twice as long as movable digit (SL/MDL 2–2.4)................................... 5

5. Spermatodactyl wider, with obvious proximal expansion and narrower distal section; larger palptibial projection regularly rounded; dorsocentral setae shorter: setae J2 with tips reaching between insertions of setae J2 and J3; length of dorsal shield 750 µm.................................................................... P. (L.) squamifer Berlese, 1920 

- Spermatodactyl narrower, sword-like, with almost parallel lateral margins in proximal section, moderately tapered distally; larger palptibial projection with small incision on rounded distal margin; dorsocentral setae longer: setae J2 with tips reaching close to insertions of setae J3; length of dorsal shield unknown............... P. (L.) conifer Hirschmann & Krauss, 1965 

6. Palptibia with one projection (produced into needle-like apex); length of dorsal shield 945–1,025 µm.................................................................................. P. (L.) granulifer Hirschmann & Krauss, 1965 

- Palptibia with at least two adjacent projections............................................................. 7

7. Dorsal setae J4 and J5 subequal or only negligibly differing in length........................................... 8

- Dorsal setae J4 and J5 well differing in length, setae J4 at least 1.5 times as long as setae J5........................ 10

8. Dorsocentral setae longer: setae J1 with tips reaching beyond insertions of setae J2; at least one palptibial projection with pointed distal margin; spermatodactyl wider, with obvious proximal expansion, narrower distal section and slight subterminal constriction; length of dorsal shield unknown............................ P. (L.) pulsator Hirschmann & Krauss, 1965 

- Dorsocentral setae shorter: setae J1 with tips reaching between insertions of setae J1 and J2; both palptibial projections with rounded distal margin; spermatodactyl narrower, sword-like to spear-like, with almost parallel lateral margins in medial section and moderately tapered distal section................................................................. 9

9. Spermatodactyl laterally flattened, sword-like, straight, relatively shorter, less than two times the movable digit (SL/MDL 1.7‒1.9); laterally and marginally inserted setae relatively short: z6 <½ z6‒Z1, s4 <s4‒s5, Z2 <Z2‒Z3; smaller species, length of dorsal shield 470–510 µm................................. P. (L.) brevipilis Mašán, Özbek & Fenďa, 2016 

- Spermatodactyl tubular, spear-shaped, slightly sinuous, relatively longer, more than three times the movable digit; laterally and marginally inserted setae relatively long: z6> z6‒Z1, s4> s4‒s5, Z2> Z2‒Z3; length (mean) of dorsal shield 836 µm.............................................................................. P. (L.) silviae Moraza & Peña, 2005 

10. Apex of cheliceral spermatodactyl with special horseshoe-like process; length of dorsal shield 810 µm................................................................................................ P. (L.) virago Berlese, 1920 

- Apex of spermatodactyl regularly formed, never with additional process....................................... 11

11. Apex of spermatodactyl with small subterminal incision; apex of larger palptibial projection produced into needle-like structure; length of dorsal shield 640–715 µm......................................... P. (L.) carpathicus Mašán, 2007 

- Apex of spermatodactyl regularly formed, without incisions; palptibial projections with distal margin rounded or obtusely tapered........................................................................................... 12

12. Spermatodactyl with moderate subapical constriction, apex relatively wide and abruptly curved backward; length of dorsal shield 660‒710 µm................................................................. P. (L.) pantinii  sp. nov.

- Apex of spermatodactyl regularly tapered, straight and directed downward...................................... 13

13. Spermatodactyl relatively wide, with proximal expansion, leaf-like or flag-like.................................. 14

- Spermatodactyl narrow, regularly tapered posteriorly, sword-like to stiletto-like.................................. 18

14. Spermatodactyl with denticulate anterior medial margin.................................................... 15

- Spermatodactyl with smooth margins................................................................... 16

15. Distal portion of spermatodactyl narrowed and elongated; spermatodactyl 205‒225 µm long (SL/MDL 3.2‒3.6); palptibial projections narrowed toward apex; length of dorsal shield 690‒770 µm....................... P. (L.) abludens  sp. nov.

- Distal portion of spermatodactyl relatively wide and short; spermatodactyl 165‒185 µm long (SL/MDL 2.5‒2.85); larger palptibial projection widely rounded; length of dorsal shield 710‒750 µm................... P. (L.) marcovallei  sp. nov.

16. Spermatodactyl with basal expansion, relatively longer (SL/MDL> 2.5); sperm ductule with symmetrical position along both margins of spermatodactyl; length of dorsal shield unknown............ P. (L.) longicrinitus Hirschmann & Krauss, 1965 

- Spermatodactyl with medial expansion, relatively shorter (SL/MDL <2.5); sperm ductule situated more closely to anterior margin of spermatodactyl............................................................................. 17

17. Spermatodactyl 110‒120 µm long (SL/MDL = 2); dorsal setae J5 more than two times shorter the setae J4; palptibial projections narrowed toward apex; length of dorsal shield 670‒735 µm....................... P. (L.) distinctus Mašán, 2007 

- Spermatodactyl 130‒150 µm long (SL/MDL 2‒2.25); dorsal setae J5 less than two times shorter the setae J4; larger palptibial projection widely rounded; length of dorsal shield 720‒810 µm........................... P. (L.) bergomensis  sp. nov.

18. Two palptibial projections with parallel contiguous margins and adjacent apices; spermatodactyl relatively longer (SL/MDL = 2); terminal hook of cheliceral fixed digit bifid; length of dorsal shield 645–735 µm....... P. (L.) longulus Willmann, 1938 

- Two palptibial projections with divergent contiguous margins and apices well separated; spermatodactyl relatively shorter (SL/ MDL 1.6‒1.8); terminal hook of cheliceral fixed digit simple................................................ 19

19. Palptibial projections reduced in size, markedly shorter than cross-sectional radius of palptibia; length of dorsal shield unknown........................................................ P. (L.) gibbosus Hirschmann & Krauss, 1965 

- Palptibial projections normal, as long as cross-sectional radius of palptibia...................................... 20

20. Dorsal setae relatively longer: setae J1 with tips reaching beyond insertions of setae J2, setae J3 with tips reaching to insertions of setae J5; cheliceral spermatodactyl relatively shorter (SL/MDL 1.6); length of dorsal shield unknown................................................................................. P. (L.) decipiens Hirschmann & Krauss, 1965 

- Dorsal setae relatively shorter: setae J1 with tips not reaching beyond insertions of setae J2, setae J3 with tips reaching between insertions of setae J3 and J5; spermatodactyl relatively longer (SL/MDL 1.8); length of dorsal shield unknown............................................................................ P. (L.) hestulifer Hirschmann & Krauss, 1965