Polydesmidae, Leach, 1815

Golovatch, Sergei, Evsyukov, Aleksandr & Reip, Hans, 2016, The millipede family Polydesmidae in the Caucasus (Diplopoda: Polydesmida), Zootaxa 4085 (1), pp. 1-51: 47-48

publication ID

http://doi.org/10.11646/zootaxa.4085.1.1

publication LSID

lsid:zoobank.org:pub:7F819439-FD77-4EF2-8E26-7B46F9B5FAAB

persistent identifier

http://treatment.plazi.org/id/03D23F44-F63C-9D14-FF07-5234FA38C1EA

treatment provided by

Plazi

scientific name

Polydesmidae
status

 

Key to Polydesmidae  species presently known to occur in the Caucasus

1. Adults with 20 segments, including telson. Collum often as broad as or broader than head. Gonopod telopodite often elongate and subgeniculate distally.................................................................... Polydesmus, 2

- Adults with 19 segments, including telson. Head broader than collum. Gonopod telopodite stout and never subgeniculate distally................................................................................... Brachydesmus  , 5

2. Live coloration usually light brown to brown ( Figs 3AView FIGURE 3, 5AView FIGURE 5). Paraterga not upturned, subhorizontal to slightly declivous, dorsum slightly, but clearly convex in the middle ( Figs 3A, 3H – 3JView FIGURE 3, 5AView FIGURE 5). Collum clearly narrower than head ( Figs 3A, 3HView FIGURE 3, 5AView FIGURE 5)...................................................................................................... 3

- Coloration largely red to pinkish. Paraterga very broad, held high, about level to a flat mid-dorsal region, a few first postcollum paraterga slightly, but clearly upturned ( Figs 2EView FIGURE 2, 3BView FIGURE 3)........................................................ 4

3. Male prefemora strongly bulging laterad ( Fig. 5BView FIGURE 5). Gonopod telopodite stout ( Fig. 5CView FIGURE 5)......... Polydesmus mediterraneus 

- Male prefemora only slightly bulging laterad. Gonopod telopodite strongly elongate, subgeniculate distally ( Fig. 4C, 4DView FIGURE 4)............................................................................................ P. muralewiczi 

4. Length ca 10 – 13 mm (male, female), width of midbody metazonae 1.25 – 1.7 (male) or 1.4 – 2.1 mm (female), metazonite to prozonite width ratio <2.0 ( Fig. 2View FIGURE 2). Collum about as broad as head ( Fig. 2A, 2B, 2FView FIGURE 2)......................... P. lignaui 

- Length ca 13 – 19 mm (male, female), width of midbody metazonae 1.9 – 3.3 (male) or 2.4 – 3.5 mm (female), metazonite to prozonite width ratio> 2.0 ( Fig. 1View FIGURE 1). Collum clearly broader than head ( Fig. 1View FIGURE 1).............................. P. abchasius 

5. Paraterga poorly-developed, their fore margins and anterolateral corners largely broadly and regularly rounded, not angular ( Fig. 10CView FIGURE 10). Metatergal sculpture strongly obliterate ( Fig. 10A – 10DView FIGURE 10). Gonopod exomere (ex) with a conspicuous densely pilose strip ( Fig. 10E – 10GView FIGURE 10)................................................................ Brachydesmus furcatus 

- Paraterga variously developed, but their fore margins and anterolateral corners mostly clearly angulate (e.g. Figs 6View FIGURE 6, 9AView FIGURE 9, 12View FIGURE 12, 13B, 13EView FIGURE 13, 15BView FIGURE 15, 16B, 16EView FIGURE 16). Metatergal sculpture often more strongly developed. Gonopod exomere without a pilose strip, but endomere often with densely pilose patches................................................................ 6

6. Tergal setae sharp ( Fig. 9AView FIGURE 9). Gonopod ( Fig. 9BView FIGURE 9) unipartite, slender, only slightly falcate, ventrally with several teeth or spines............................................................................................. B. superus 

- Tergal setae mostly bacilliform or subclavate, only rarely sharpened. Gonopod telopodite bipartite, with a distinct exomere and a smaller, but evident endomere.

7. Adults <8 mm long and ≤ 1.0 mm wide. Gonopod exomere with only a single apical tooth ( Figs 28C – 28DView FIGURE 28, 29C – 29GView FIGURE 29). Colchis, Black Sea coast area............................................................................ 8

- Adults ≥ 9 mm long and ≥ 1.0 mm wide.................................................................... 9

8. Length 6 – 7.5 mm, width of midbody metazonae 0.8 – 1.0 mm, metazonite to prozonite width ratio ca 1.5 – 1.6 ( Fig. 29AView FIGURE 29). Male legs slightly, but clearly incrassate ( Fig. 29BView FIGURE 29). Gonopod exomere longer ( Figs 29C – 29GView FIGURE 29). Ajaria, Georgia.. B. simplex  sp. n. 

- Length 5 – 6 mm, width of midbody metazonae 0.65 – 0.7 mm, metazonite to prozonite width ratio ca 1.3 ( Fig. 28AView FIGURE 28). Male legs slender ( Fig. 28BView FIGURE 28). Gonopod exomere shorter ( Figs 28C – 28DView FIGURE 28). Abkhazia and Sochi  , Krasnodar Prov., Russia................................................................................................... B. kvavadzei  sp. n. 

9. Gonopod endomere (en) partially densely pilose and clearly bifid; exomere (ex) with 1 – 2 apical teeth e and i (the latter often subapical), often also with another subapical lobule or denticle l ( Figs 13G – 13HView FIGURE 13, 14C – 14EView FIGURE 14, 16G – 16HView FIGURE 16, 18D – 18EView FIGURE 18, 19D – 19EView FIGURE 19, 21D – 21FView FIGURE 21, 22 – 25View FIGURE 22View FIGURE 23View FIGURE 24View FIGURE 25, 27B, 27DView FIGURE 27). Extremely widespread (Map 2) and variable in all other characters, morphism outlined in Table 1...................................................................................... B. kalischewskyi 

- Gonopods subfalcate, endomere (en) simple, more or less finger-shaped ( Figs 7View FIGURE 7, 8E – 8FView FIGURE 8)........................... 10

10. Tergal setae mostly subclavate ( Fig. 6C – 6HView FIGURE 6). Gonopod exomere (ex) more elaborate ( Fig. 7View FIGURE 7). Much of both Caucasus Major and Caucasus Minor, but not Hyrcania (Map 3)..................................................... B. assimilis 

- Tergal setae sharp ( Fig. 9AView FIGURE 9). Gonopod exomere (ex) simple ( Fig. 8FView FIGURE 8). Hyrcania (Map 3)................... B. pigmentatus