Isophya thracica Karabag 1962

Dragan P. Chobanov, Beata Grzywacz, Ionuţ Ş. Iorgu, Battal Cιplak, Maya B. Ilieva & Elżbieta Warchałowska-Śliwa, 2013, Review of the Balkan Isophya (Orthoptera: Phaneropteridae) with particular emphasis on the Isophya modesta group and remarks on the systematics of the genus based on morphological and acoustic data, Zootaxa 3658 (1), pp. 1-81 : 14-18

publication ID

https://doi.org/ 10.11646/zootaxa.3658.1.1

publication LSID

lsid:zoobank.org:pub:C02D1C74-25C0-41DD-B098-62098EB7B62A

DOI

https://doi.org/10.5281/zenodo.5617327

persistent identifier

https://treatment.plazi.org/id/F26F3128-3905-FF80-B1B0-0A94FE9E9968

treatment provided by

Plazi

scientific name

Isophya thracica Karabag 1962
status

 

2.3. Isophya thracica Karabag 1962

( Figs 3 View FIGURES 1 – 18 , 34, 59 View FIGURES 56 – 79 , 83 View FIGURES 80 – 104 , 108 View FIGURES 105 – 129 , 134 View FIGURES 130 – 134 , 138 View FIGURES 135 – 138 , 191 View FIGURE 191 )

Isophya thracica Karabag : Karabag 1962 (sp.n.).

Morphological description: Karabag 1962; Harz 1969; Heller 1988. Bioacoustics: Heller 1988.

The species has unique combination of characters of the male and female tegmina ( Figs 3 View FIGURES 1 – 18 , 34, 59 View FIGURES 56 – 79 ). While males have outstandingly long tegmina with very short CuP similarly to the primitive state in I. straubei group, the female tegmina show advanced shortening and reticulate venation of tegmina. Hind femora lack ventral spines. CuP is weak and among the shortest in Isophya being about 1/2 of the hind edge of pronotum; CuP and CuA are widely separated. Male and female stridulatory apparatus are shown on Fig 134 View FIGURES 130 – 134 (A and D). Male stridulatory row has a length of 1.78–2 mm with 58–70 teeth. Male cerci ( Fig. 83 View FIGURES 80 – 104 , 134 View FIGURES 130 – 134 C) are stout, apically strongly incurved and bear a large, showel-like tooth. The ovipositor ( Fig. 108 View FIGURES 105 – 129 ) is short (7.5–9 mm). The song ( Fig. 113 View FIGURES 105 – 129 ) consists of short isolated syllables divided into main part and an after-click.

Bioacoustics: The song was studied in specimens from Elmali Village in European Turkey. At a temperature of 17–19°С the song consisted of single syllables that rarely were mixed with groups of two syllables. Syllables were repeated at an interval of 7–15 or, when grouped, at 1.5–3 s. The syllables are composed by main part followed by additional part of a single or up to three after-clicks. The main syllable part lasted 67–86 ms (mean 76±5; n=32) and consisted of 18–25 impulses (mean 21±2; n=30) with impulse period of 3–9 ms. The first impulse has much higher amplitude than the rest in the syllable. The additional syllable part followed at 48–143 ms (mean 82±27; n=31) and was composed by one or up to three impulses; the impulse period if more than one impulse lasted 10–15 ms. The total syllable length was 124–212 ms (mean 174±23; n=31). The song properties presented by Heller (1988) were measured at over 24.5°С and in order to be comparable we preferred to give similar data in the Tabulated key ( Table 1 View TABLE 1 ).

Distribution ( Fig. 191 View FIGURE 191 ) and phenology: Endemic for the southern part of Eastern Thrace (European Turkey). Its phenology is poorly known; early species emerging in February–April and imaginal moulting from the end of April; imagines disappear in July. Near Elmali Village the species was found within xerothermophyte scrub of Quercus pubescens and Juniperus oxycedrus but possibly inhabits a wide variety of vegetation types.

…… continued on the next page II. Northern stock or Northern species of Isophya

A large number of taxa (i.e. presently 36 species) with various morphological features and song structures occur from Northwestern Anatolia to Central and Eastern Europe reaching the Altai Mountains in the East and the Pyrenees in the West. Warchałowska-Śliwa et al. (2008) classified the taxa studied by them in four groups: I. modesta , I. pyrenaea , I. costata and I. kraussii group. Yet, outlining these is complicated due to transitional morphological characters, undescribed songs, and great genetic similarity resulting in perplexed molecular phylogeny. The group is quite diverse morpho-acoustically but the transitions may be very smooth and thus clear distinction between the groups is frequently difficult. Excluding the majority of I. modesta group, making the transition between the primitive I. straubei and I. rectipennis groups and the typical Northern stock, most taxa concerned here have the following common morphological tendencies: (1) shortened tegmina both in males and females with blunt apical parts in females; (2) moderately or strongly approximated CuP and CuA; (3) female tegmina with reticulate venation; (4) lack of typical melanism or, in some taxa, tendency of development of melanistic colouration. Re-evaluating the known taxonomic characters we generally sustain the classification by Warchałowska-Śliwa et al. (2008), yet using the possibility of further subdivision of some of these groups. The following groups are considered here: (1) I. modesta group; (2) I. costata group; (3) I. kraussii group; (4) I. pyrenaea group.

TABLE 1. Tabulated key for distinguishing the Balkan species of Isophya.

Species/ Character Width of fastigium / scapus Width of male tegmina in comparison to width of metazone Length of male tegmina: length of pronotum Shape of anal angle of left tegmen Length of CuP: width of metazone CuA– CuP position Position of veins of female tegmina Number of stridulatory teeth Shape of male cerci Length of ovipositor /pronotum Song structure Syllables main part (20– 30°C) [ms] Syllables main + additionalpart (20–30°C) [ms] Melanism Colouration of stripes at dorsolateral borders of pronotum Distribution
I. hospodar ±equal narrower 1.2–1.5: 1 obtuse 1/2–2/3 widely separated ±parallel 63–78 Fig. 80 2–2.5 groups of phrases <50 absent no dark stripes E Balkans
I. rectipennis ±equal narrower ±equal obtuse 1/2–2/3 widely separated ±parallel 45–60 Fig. 81 1.6–2 phrases 10–50 absent no dark stripes SE Romania, E Balkans, NW Anatolia
I. pavelii ±equal ±equal ±equal or slightly longer obtuse 2/3–3/4 slightly attached ±parallel 97–115 Fig. 82 1.7–2.1 phrases 25–120 absent reddish SE Balkans, NW Anatolia
I. thracica 1/2–equal narrower ±1.5: 1 obtuse ±1/2 widely separated reticulate 58–70 Fig. 83 1.6–<2 groups of syllables <70 ±100 absent reddish S European Turkey

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Orthoptera

Family

Phaneropteridae

Genus

Isophya

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