Research Article Journal of Orthoptera Research 2022, 31(1): 55-61 First records of three exotic giant mantid species on the Croatian coast MatedA MaArtINovic!, SEBASTIAN CATO2, MARKO LENGAR?, Josip SkEJO*4 1 Dubrovnik Natural History Museum, Androviéeva 1, HR-20000 Dubrovnik, Croatia. 2 Bribirskih knezova 22, HR-22211 Vodice, Croatia. 3 Kranjska cesta 4c, SI-1241 Kamnik, Slovenia. A University of Zagreb, Faculty of Science, Department of Biology, Division of Zoology, Evolution Lab, Rooseveltov trg 6, HR-10000 Zagreb, Croatia. Corresponding author: Matea Martinovi¢ (matea.martinovic@pmd.hr) Academic editor: Alina Avanesyan | Received 3 October 2021 | Accepted 8 January 2022 | Published 19 May 2022 http://zoobank.org/CEE539CD-F0GE-4199-9070-065C8FBA1 E73 Citation: Martinovi¢ M, Cato S, Lengar M, Skejo J (2022) First records of three exotic giant mantid species on the Croatian coast. Journal of Orthoptera Research 31(1): 55-61. https://doi.org/10.3897/jor.31.76075 Abstract Some giant mantid species of the genera Sphodromantis Stal, 1871 and Hierodula Burmeister, 1838 have been found spreading their distribution through the Palearctic, but none of the species have been recorded from the Adriatic coast of Croatia, where numerous local species already co- exist, such as Mantis religiosa (Linnaeus, 1758) and Iris oratoria (Linnaeus, 1758). In this study, we present the first records of the giant African mantis (Sphodromantis viridis (Forskal, 1775)), the Indochina mantis (Hierodula patellifera Serville, 1839), and the giant Asian mantis (Hierodula tenuiden- tata Saussure, 1869) from Croatia. A small population of S. viridis was ob- served in the southernmost county of Croatia (Dubrovnik); a single record of H. patellifera comes from the westernmost part of the country (Istria), while the first two specimens of H. tenuidentata were observed in the cen- tral part of the Croatian coast (Sibenik). These alien species represent three new taxa for the mantid fauna of Croatia, which now counts 9 or 10 spe- cies (depending on inclusion of Ameles heldreichi Brunner von Wattenwyl, 1882). The fast spreading of these species in Europe proves their adapta- tion to regions where they have arrived; thus, future monitoring of the spe- cies must be conducted in order to determine their impact on native fauna. Keywords alien, allochtonous, Dubrovnik, Europe, Hierodula patellifera, Hierodula tenuidentata, Istria, Mantodea, new records, Sibenik, Sphodromanitis viridis, spreading Introduction Mantids are large predatory insects, so people have been ob- serving them from prehistory (Battiston et al. 2010, Kolnegari et al. 2020). More than 2500 species are known (Otte et al. 2021), with the greatest diversity being in the tropical regions (Schwarz and Roy 2019, Otte et al. 2021). Mantid fauna of the Western palearc- tic consists of about 130 species (Battiston et al. 2010), while, for example, Vietnam is home to almost 70 species (Shcherbakov and Anisyutkin 2018). Few species are shared between tropical and temperate regions; this study shines the spotlight on three. Until now, small Croatian Mantodea fauna consisted of seven species belonging to five genera (Ameles Burmeister, 1838, Em- pusa Illiger, 1798, Geomantis Pantel, 1896, Iris Saussure, 1891 and Mantis Linnaeus, 1758) (Rebrina et al. 2014), but the giant African mantis (Sphodromantis viridis (Forskal, 1775)), the Indochina man- tis (Hierodula patellifera Serville, 1839), and the giant Asian mantis (Hierodula tenuidentata Saussure, 1869) are expected to spread into the country soon. S. viridis is widespread in the sub-Saharan region and is known to be very adaptable to different kinds of environments, including anthropized ones (Battiston et al. 2020a). In Europe, it was known only from Southern Spain (Bolivar 1876, Gangwere and Mo- rales Agacino 1970) until it was recorded in Mallorca (Canyelles and Alomar 2006) and in Central Spain (Cabanillas 2017) and eventual- ly Portugal (Marabuto et al. 2014, Oliveira and Ferreira 2019), France (Battiston et al. 2020a), Italy (Battiston et al. 2017, 2019, 2020a), and Greece (Battiston et al. 2020a). On the other hand, H. patellifera and H. tenuidentata are native to Asia. The first European records of the former species date back to 2013 in Southern France (Moulin 2020) and 2015 in Italy (Battiston et al. 2020a); the earliest European record of the latter was from Crimea (Werner 1916), where it was rediscov- ered 100 years later. It is now widespread along the entire coast of the peninsula, from where it started its expansion northwards in other parts of Ukraine (Pushkar and Kavurka 2016). Soon after, European records of H. tenuidentata began to be reported frequently. Today, the species is known to be present in Bulgaria and Greece (Romanowski et al. 2019), Albania (van der Heyden 2018), Italy (Battiston et al. 2018), North Macedonia (Cianferoni et al. 2018), Serbia (Vujié et al. 2021), and Romania (Pintilioaie et al. 2021). This study provides further insight into the spread of these species in Europe. Materials and methods Hierodula patellifera finding.—A single female was found in Novi- grad (Istria) on a palm tree near a road edge. The specimen was photographed and uploaded to Biologer (an open platform for collecting biodiversity data) (Popovié et al. 2020). JOURNAL OF ORTHOPTERA RESEARCH 2022, 31(1) 56 Hierodula tenuidentata findings.—Two adult specimens were observed and photographed in the garden center “Dubrava” in Dubrava near Sibenik. Sphodromantis viridis findings.—In early November 2020, an adult male was attracted to the terrace light of a family home on Lapad peninsula in Dubrovnik. The specimen was collected, dry pinned, and deposited in the Dubrovnik Natural History Museum (DNHM). When preparation of the manuscript began based on this single male, the authors were convinced that the male individual represented the only record until it was decided to search the surrounding area for 0o- thecas. Archival photos revealed sighting of a spherical ootheca from November 2019 observed on Nerium oleander L. in a camping area close to where the adult male was collected. The camping area (Fig. 4G) was visited again in March 2021, and another ootheca was found. Online records.—iNaturalist was searched for specimens that could represent Sphodromantis or Hierodula specimens, and a single photograph depicting a nymph unidentifiable to species level was found (https://www.inaturalist.org/observations/53351490). A Ameles decolor Geomantis larvoides M. MARTINOVIG, S. CATO, M. LENGAR AND J. SKEJO Identification and systematics.—The collected specimens were iden- tified based on the morphological characteristics described in Bat- tiston et al. (2019, 2020b). At first glance, giant mantids of the genera Sphodromantis and Hierodula can be distinguished from the native, similarly sized Iris oratoria (Linnaeus, 1758) or Mantis religi- osa (Linnaeus, 1758) by the presence of white-colored stigmas on the tegmina (Figs 2A, 3A, 4C). Both species of the genus Hierodula spreading through Europe (H. patellifera and H. tenuidentata) have three dark-colored horizontal lines on the ventral part of the tho- rax (Fig. 2B), which are absent in S. viridis (Fig. 4A). Additionally, differences exist in the shape and length of the pronotum, which is long and thin in Sphodromantis (Fig. 4B) but short and ovoidal in Hierodula (Fig. 3A). The two Hierodula species may be separat- ed by the morphology of the inner margin of the anterior coxa. In H. patellifera, it is equipped with yellowish spines with basal plates (Fig. 2B, C), while basal plates are absent in H. tenuidentata (Fig. 3B). The higher systematics follow Battiston et al. 2010, while species nomenclature follows the Mantodea species file (Otte et all. 2021). In the literature, H. tenuidentata is sometimes reported un- der its synonym, T! transcaucasica. Most probably, H. tenuidentata B Ameles spallanzania Fig. 1. Native Croatian Amelidae and Mantidae representatives and their distribution areas in Croatia. A. Ameles decolor; B. Ameles spal- lanzania; C. Geomantis larvoides; D. Mantis religiosa. (Photo credit A, B. Gernot Kunz; C. Radomir Jaskula; D. Matea Martinovic). JOURNAL OF ORTHOPTERA RESEARCH 2022, 31(1) M. MARTINOVIG, S. GATO, M. LENGAR AND J. SKEJO represents a single species distributed from India to Europe (Bat- tiston et al. 2018). Results Order Mantodea Family Mantidae Burmeister, 1838 Composition and distribution in Croatia.—Hitherto, at least four spe- cies belonging to three genera (Ameles, Mantis, Geomantis) have been reported from the country (Rebrina et al. 2014). In current taxono- my (Schwarz and Roy 2019), Ameles belongs to Amelidae; thus, it is 97 no longer included in Mantidae, so the following checklist includes members of both families in the Croatian fauna. Distribution fol- lows data from Rebrina et al. (2014), GBIF (2021), and iNaturalist (2021). This study presents the first records of members of two more genera, Hierodula and Sphodromantis, found to be present in Croatia. Checklist of genera and species of Croatian Amelidae and Mantidae with new records of alien taxa Genus Ameles Burmeister, 1838 Species A. decolor (Charpentier, 1825) (Fig. 1A), common in the Adriatic and Dinaric regions. Fig. 2. Hierodula patellifera Serville, 1839, female. A. Presence of the white-colored stigma on the tegmina; B. Lateral view, yellow spines with basal plates on the anterior coxa and dark-colored horizontal lines on the ventral part of the thorax; C. Frontal view, yellow spines with basal plates on the anterior coxa; D. Map with locality of the first Croatian record, western-most part of the Adriatic coast. Photo credit: Marko Lengar. JOURNAL OF ORTHOPTERA RESEARCH 2022, 31(1) 58 M. tA Lf Ay ““Hiero dula tenuidentatd MARTINOVIG, S. GATO, M. LENGAR AND J. SKEJO | ’ - - SS —, Fig. 3. Hierodula tenuidentata Saussure, 1869, female. A. Dorsal view, presence of white-colored stigma on the tegmina, pronotum; B. Ventral view, yellow spines without basal plates on the anterior coxa; C. Map with locality of the first Croatian record, central part of the Adriatic coast. Photo credit: Sebastian Cato. ** Species A. heldreichi Brunner von Wattenwyl, 1882, could be present in the far south. Presence of A. heldreichi in the Adri- atic coast is doubtful (M. Villani, pers. comm.). Shape of the eyes is unreliable diagnostic trait, so the reports of A. heldreichi from Croatia are questionable; all records should be regarded as A. decolor. Species A. spallanzania (Rossi, 1792) (Fig. 1B), common in the Adriatic and Dinaric regions. Genus Geomantis Pantel, 1896 Species G. larvoides Pantel, 1896 (Fig. 1C), known only from Dubrovnik Area. Genus Hierodula Burmeister, 1838 Species H. patellifera Serville, 1839, newly reported for the country (Fig. 2) First record for Croatia. —19Q; Istria County: Novigrad: Dajla, resi- dental area [45°21'05.7"N, 13°32'42.8”E], 6 mazs.l., 21.X1.2020, obs. M. Lengar. Species H. tenuidentata Saussure, 1869, newly reported for the country (Fig. 3) First record for Croatia.—19 and 14; Sibenik-Knin County: Sibenik: Dubrava kod Sibenika, Garden center “Dubrava” [43°44’08.7’"N, 15°56'46.4’E], 84 m ass.l., 21.VIII.2021, obs. S. Cato. Genus Mantis Linnaeus, 1758 Species M. religiosa (Linnaeus, 1758) (Fig. 1D), widespread in whole country. Genus Sphodromantis Stal, 1871 Species S. viridis (Forskal, 1775), newly reported for the coun- try (Fig. 4). First records for Croatia.—(1/3) ootheca (Fig. 4D), Dubrovnik- Neretva County: Dubrovnik: Lapad peninsula, camping area [42939'A77 "Ne '8° 0411-8" BY 23° meals: 1 X120197.-Gbs. M. Martinovi¢; (2/3) ootheca (Fig. 4E), same place as the first one, 26.11.2021, obs. M. Martinovié; (3/3) 14 Dubrovnik-Neretva JOURNAL OF ORTHOPTERA RESEARCH 2022, 31(1) M. MARTINOVIG, S. CATO, M. LENGAR AND J. SKEJO Sphodromanitis viridis ae ei at), y fot ¥ SU cA Rina Le S ‘er f Fig. 4. Sphodromantis viridis (Forskal, 1775), male. A. Absence of the dark-colored horizontal lines on the ventral part of the thorax; B. Pronotum; C. Presence of the white-colored stigma on the tegmina; D. Ootheca from 2019; E. Ootheca from 2021; F. Map with locality of the first Croatian record, southernmost part of the Adriatic coast; G. Camping area and habitat where small population of S. viridis was established. Photo credit: Matea Martinovic. County: Dubrovnik: Lapad, residential area, [42°39'39.5”N, 2020 by Dennis Aagaard in a small tourist area called Zaton near 18°04'42.1”E], 12 ma.s.l., 3.X1.2020, obs. & coll. M. Martinovi€é. Zadar; the photo was published on iNaturalist (observation num- ber 53351490). The nymph in the photo has its abdomen bended Taxa not identified to species level.—Besides the new records identi- at an angle of 90°, which is a diagnostic character related to the fied to species level, a juvenile specimen was observed on 13" July juvenile stages of both S. viridis and Hierodula species. Nymphs of JOURNAL OF ORTHOPTERA RESEARCH 2022, 31(1) 60 M. religiosa have the abdomen held parallel to the ground from the first to the last moult (Battiston et al. 2019). Although not identifiable to the species level from the photo, this record signals the possibility that H. tenuidentata Saussure, 1869 is already wide- spread in Dalmatia. More records are anticipated soon. Discussion Finding a single male of an allochthonous mantid species could be overlooked, but finding two oothecas at the same place two years apart suggests that a small population of S. viridis has been established in Southern Croatia (Fig. 4F). Dubrovnik is on the itineraries of many cruise ships, and it is included in both Western and Eastern Mediterranean cruise routes. During their round-trip excursions, some cruise ships visit several port cities in southern Spain, France, Italy, Cyprus, Turkey, and Greece, which are already inhabited by S. viridis, before arrival in Dubrovnik. The cruise-ship route probably served as a pathway of introduction for S. viridis to Croatia. The locality where the small population of S. viridis was recorded is situated on the Lapad peninsula, right at the entrance to the Port of Dubrovnik. The species is likely attracted to the lights of ships staying the night in the Mediterranean ports within the species’ distribution area; in this way, they arrive in Dubrovnik as a blind passenger, either from the western Mediterranean (Southern Spain) or from the Middle East (Cyprus, Turkey). This hypothesis is in accordance with insights on the human-assisted speed of ex- pansion of S. viridis across the Mediterranean region (Battiston et al. 2020a). However, there are many other plausible causes. For example, oothecae may have come attached to plants or other commercial goods or attached to tourists’ cars or personal items. Finding two specimens of H. tenuidentata in the garden center “Dubrava” in Dubrava near Sibenik (Fig. 3C) adds credence to the possibility of human-assisted expansion of this species in Europe, as the garden center sells plants imported from various areas in Italy where H. tenuidentata is known to be present (Battiston et al. 2018). Unfortunately, a lack of evidence means we can only propose hypotheses to be tested by future dispersals within the region. We will continue to monitor the garden center in order to assess whether the species already has the population established. As in France and Italy where individuals of H. patellifera were observed mainly on trees (Battiston et al. 2020b, Moulin 2020), the female specimen found in late November 2020 on a palm tree is further confirmation of the arboreal habits of this species. The arrival of H. patellifera in the westernmost part of the Croatian Adriatic (Fig. 2D) is likely a result of natural dispersal from the neighboring Northern Italy where several fragmented and repro- ducing sub-populations exist (Battiston et al. 2020b). There is currently no evidence of invasive behavior from these alien species. However, they have only been present for a short period, and their impact on local fauna should be determined by detailed research conducted over the span of many years. Compar- ative studies are needed to determine whether Hierodula and Spho- dromantis represent direct competition to Mantis, Iris, or Empusa. Sphodromantis is not expected to spread much, as it prefers habitats influenced by the Mediterranean climate. Hierodula species are, however, expected to spread more, considering that H. tenuidentata is already surviving the cold Pannonian winters in Serbia (Vuji¢ et al. 2021). 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