1

Metrioptera oblongicollis

Metrioptera oblongicollis

Metrioptera saussuriana

200 ms

FIGURE 9.1 Oscillograms of stridulatory movements and song (synchronous registration of left tegmen movement [here and in Figure 9.2, Figure 9.4 and Figure 9.5 upward deflection represents opening, downward closing] and sound) of some species of the genus Metrioptera (localities of recorded specimen on CD).

Metrioptera saussuriana

200 ms

FIGURE 9.1 Oscillograms of stridulatory movements and song (synchronous registration of left tegmen movement [here and in Figure 9.2, Figure 9.4 and Figure 9.5 upward deflection represents opening, downward closing] and sound) of some species of the genus Metrioptera (localities of recorded specimen on CD).

however, important in models of allopatric speciation and there is a large literature on this (Otte and Endler, 1989). Here, we shall concentrate on the comparison between differences in song and male genitalia. In the four parts of this section we shall:

• Describe the situation in the subgenus Parnassiana (genus Platycleis) in detail.

• List examples where only one trait (song or morphology) shows differences and the other seems to be more or less stable.

• Mention rare examples where allopatric populations of one species differ in song and morphology.

The Subgenus Parnassiana (Tettigoniidae: Platycleidini: Platycleis)

Parnassiana occurs with about 15 taxa (12 monotypic species and one species with three subspecies) on high mountains in Greece. A further species (P. vicheti), endemic to Southern France, probably belongs in another (sub)genus. All described forms occur allopatrically at high altitudes on different mountains (Figure 9.2). The species may be differentiated mainly by their genitalia (Figure 9.3), although a few differences in coloration and pronotum shape are also important (mainly for subspecies recognition; see Willemse, 1985). Calling songs are known for tymphiensis

Song unknown: panaetolikon chelmos tenuis

tymphiensis

Song unknown: panaetolikon chelmos

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menalon

FIGURE 9.2 Distribution map and oscillograms of song of the species of the subgenus Parnassiana (genus Platycleis) and of stridulatory movements (in eight species only; synchronous registration of left tegmen movement and sound). Localities of recorded specimen on CD, distribution data from Willemse, F., Catalogue of the Orthoptera of Greece, Fauna Graeciae, Hellenic Zoological Society, Athens, 1984, p. 1, i-xii, 1-275; Willemse, L. and Willemse, F., Entomol. Ber. Amsterdam, 47, 105-107, 1987; Heller, K.-G. and Willemse, F., Entomol. Ber., 49, 144-156, 1989.

nigromarginata l^wwvwywyfv.

tymphrestos

tymphrestos

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tiiJ

Iii

dirphys

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