Distribution of the mysterious Chevron Crickets Melanabropsis Wang & Liu, 2020, with a remarkable new species from Hainan, China (Orthoptera: Anostostomatidae: Anabropsini) Author Yin, Zi-Xu text Zootaxa 2024 2024-06-25 5474 1 81 93 http://dx.doi.org/10.11646/zootaxa.5474.1.8 journal article 298918 10.11646/zootaxa.5474.1.8 8b120e4b-6c26-4fba-baef-bc7dedec3fdc 1175-5326 12527085 D3569CF9-ACA1-4D90-9D63-3DD1D82A7C90 2. Melanabropsis distribution analysis The model performance is very high, as the AUC value for 10 replicates equals 0.996 ± 0.003 (standard deviation). Mean diurnal range (bio_2) is the most important variables when predicting suitable habitats, with max temperature of warmest month (bio_5), annual precipitation (bio_12) and precipitation of warmest quarter (bio_18) ranking in top four ( Tab. 2 ). The response curve of bio_2 shows that: the highest suitability is observed when the temperature difference is less than 5 ℃, gradually decreasing with increasing mean diurnal range, and becoming unsuitable when the temperature difference exceeds 8 ℃ ( Fig. 9A ). The response curve of bio_5 shows that the most suitable max temperature in summer is about 27 ℃ ( Fig. 9B ). The response curve of bio_12 and bio_18 shows that the more precipitation (especially in summer), the more suitable for the species ( Fig. 9 CD). In conclusion, the species of Melanabropsis prefer humid areas with relatively low summer temperature and small diurnal temperature differences. FIGURE 6. Holistic view of Melanabropsis nightfury . A. dorsal view of male; B. lateral view of male; C. dorsal view of female; D. lateral view of female. Scale: 1 cm. A and B corresponds to the vertical scale; C and D corresponds to the aclinic scale. FIGURE 7. Holistic view of female Melanabropsis murayamai . A. dorsal view; B. lateral view. Scale: 1 cm. TABLE 2. Predictive contributions for all data.

Variable	Permutation importance	Percent contribution	Variable Explanation
bio_2	64.9	46.6	Mean Diurnal Range (Mean of monthly (max temp–min temp))
bio_5	32	26.8	Max Temperature of Warmest Month
bio_12	1.5	5.2	Annual Precipitation
bio_18	0.9	2.6	Precipitation of Warmest Quarter
bio_3	0.2	1.5	Isothermality (bio_2/Temperature Annual Range) (×100)
bio_17	0.2	1.3	Precipitation of Driest Quarter
bio_13	0.2	0.3	Precipitation of Wettest Month

The table only shows the variables which permutation importance are more than zero. Fig. 8B shows the potential distributed area of Melanabropsis , which aligns with the distribution information in Fig. 8A . Among the distribution of known species, the Ryukyu Islands demonstrate the highest suitability. North of both Zhejiang Province and Guangxi Province in China , which represent the current distribution area of M. tianmuica , also exhibit moderate suitability with scattered mountains.Among distribution of known species, Hainan Island exhibits the lowest suitability. The analysis of the predicted distribution reveals that Taiwan Island , and other islands on the southeast of Taiwan Island such as Green Island and Orchid Island, all exhibit extremely high suitability. Dalou Mountains, Wuyi Mountains and Nanling Mountains in China , as well as east of Kon Tum in Vietnam exhibit moderate suitability. The observation records of Chinese insect lovers confirm the accuracy of the predicted distribution in this study: Fig. 10D observed from Zhangjiajie National Forest Park in the Dalou Mountains; Fig. 10E observed from Wuyi Mountain National Nature Reserve in the Wuyi Mountains.