Research Article |
Corresponding author: Ionuț Ștefan Iorgu ( nusi81@yahoo.com ) Academic editor: Fernando Montealegre-Z
© 2016 Ionuț Ștefan Iorgu, Elena Iulia Iorgu, Gellért Puskás, Slobodan Ivković, Simeon Borisov, Viorel Dumitru Gavril, Dragan Petrov Chobanov.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Iorgu IS, Iorgu EI, Puskás G, Ivković S, Borisov S, Gavril VD, Chobanov DP (2016) Geographic distribution of Gryllotalpa stepposa in south-eastern Europe, with first records for Romania, Hungary and Serbia (Insecta, Orthoptera, Gryllotalpidae). ZooKeys 605: 73-82. https://doi.org/10.3897/zookeys.605.8804
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Described from the steppe zones north of the Black Sea, Caucasus, and central Asia, Gryllotalpa stepposa Zhantiev was recently recorded from a few localities in Greece, R. Macedonia, and Bulgaria. In May 2015, several specimens were collected from Ivrinezu Mare in Romania, which suggested a continuous distribution area of the species, stretching from the central Balkans to central Asia. Thus, to reveal its actual range of occurrence, a survey of several Orthoptera collections became mandatory and, as expected, a large number of misidentified specimens of Gryllotalpa stepposa were discovered, providing new data on the species distribution in south-eastern Europe, including also the first records of this mole cricket in Serbia and Hungary. Here a full locality list is presented of this species west of Ukraine and Moldova and the current geographic distribution of the genus Gryllotalpa in the Balkans is revised. A key for distinguishing the mole crickets in south-eastern Europe and a distribution map for this region are presented.
Distribution, Gryllotalpa , Orthoptera , south-eastern Europe
Although the Orthoptera fauna of south-eastern Europe, including the Balkan Peninsula, is comparatively well explored, several faunistic and taxonomic issues remain and most of these address one of the most fragmentary known groups: the crickets. In the past decades, during the extensive work of exploring the Orthoptera fauna in this area, Tettigonioids and Acridoids received the highest attention, while the Grylloids were neglected, most likely due to their elusive, nocturnal way of life.
The mole crickets form a particular group within the Grylloidea. Family Gryllotalpidae includes eight genera with more than 100 species, excluding the fossil/extinct ones (
Gryllotalpa Latreille is a subcosmopolitan genus, missing only from the northernmost areas of Asia, whole south America and the boreal areas of north America. The Gryllotalpa gryllotalpa species group occurs throughout Europe, from Britain to Iran and central Asia (
The mole crickets excavate two different types of tunnels: vertical burrows, used for hiding from predators, overwintering and molting, and horizontal tunnels for feeding, mating and escaping predators (
In the present paper light is shed on the distribution of Gryllotalpa species in south-eastern Europe, based on extensive material from this area. Recent data revealed that four species of Gryllotalpa occur in south-eastern Europe and the Balkan Peninsula: G. gryllotalpa, G. stepposa, G. unispina and G. krimbasi. In order to distinguish these, several morphological traits are used and included in a key.
Gryllotalpa specimens were found while actively searching in moist ground, preferably near a water source. The easiest and most efficient way was the collection of specimens attracted to black Ultra Violet fluorescent tubes and Mercury vapor light lamps. The material preserved in the following collections was revised:
UBB
NMNHS
HMB
Collection of the Zoological Department of the History
ZZDBE
Zoological Collection of the Department of Biology and Ecology, Faculty of Sciences,
MNHM
CC Dragan Chobanov’s personal collection
Data from public collections from Macedonia are already published (
Photos used in the key were taken with a Canon EOS 6D DSLR camera and a Canon MP-E 65 mm lens. For genitalia microphotographs, the camera was mounted to a Leica 205C Stereomicroscope.
1 | Space between the proximal and next dorsal inner spine on hind tibiae wide, larger than the space between the distal spines (Fig. |
G. unispina |
– | Space between all dorsal inner spines on hind tibiae approximately equal (Fig. |
2 |
2 | Epiphallus short and wide (less than 2× longer than its widest part), apically more flattened, with a shallow ventral slot (Fig. |
G. gryllotalpa |
– | Epiphallus long and slender (its length 2–2.3× larger than its widest part and over 3× the width of apex), apically thicker, with a deep slot (Fig. |
3 |
3 | Male karyotype 2n=14, 15 or 16 (hybrids?). Poorly distinguished morphologically from the following species (according to our own measurements, differences in epiphallus proposed by |
G. stepposa |
– | Male karyotype 2n=19 | G. krimbasi |
Inner part of hind tibia: A Gryllotalpa unispina B G. stepposa C G. gryllotalpa. Dorsal view of male tegminae: D Gryllotalpa unispina E G. stepposa F G. gryllotalpa. Distal part of the median vein (♂): G Gryllotalpa stepposa H G. gryllotalpa. Epiphallus: I Gryllotalpa unispina J G. stepposa K G. gryllotalpa. Locations: Gryllotalpa unispina – Letea; G. stepposa – Șura Mare; G. gryllotalpa – Pașcani (Romania). Scale bars 1 mm.
Geographic distribution of Gryllotalpa species in south-eastern Europe: yellow squares – G. stepposa; red triangles – G. gryllotalpa; green hexagons – G. unispina; blue dots – G. krimbasi (although some localities are not confirmed by karyology studies, we considered them for G. krimbasi, based on indirect data from its distribution and nearby records).
Until recently only Gryllotalpa gryllotalpa, G. unispina, and G. krimbasi were known to occur in the Balkans. The latter was recently described from Greece (
In 1939, Steopoe, following the works of
With the present data, Gryllotalpa stepposa almost entirely replaces G. gryllotalpa on the Balkan Peninsula. In the south and west, Gryllotalpa stepposa borders G. krimbasi in Greece: the ranges of both species border approximately in the lower courses of Vardar (Axios) or Strouma (Strimon) rivers. Thus, both taxa are possibly direct competitors and exclude each other. The western border of the range of Gryllotalpa stepposa is unclear for the moment. In the north (Croatia, Serbia, Hungary, and north Romania), Gryllotalpa stepposa meets G. gryllotalpa (compare map in
We are grateful to I. Tăușan, C. O. Manci, B. Nagy, G. Szövényi, C. Adam, G. Grbic and G. Stan for providing us some of the material, to C. Sitaru for access in the collections of Museum of Zoology, Babeș-Bolyai University and to T. C. Sahlean for preparing the distribution map. This study was partially supported by the project no. RO1567-IBB04/2016 from the Institute of Biology, Romanian Academy, to V. D. Gavril. The visit to
Occurence records of the studied Gryllotalpa species
Data type: occurence
Explanation note: The occurence records of Gryllotalpa material preserved in the collections: