Thursday, March 14, 2019

[Chilopoda • 2019] Arrup akiyoshiensis • A New Species of the Genus Arrup (Geophilomorpha, Mecistocephalidae) from A Limestone Cave in Akiyoshi-dai, Western Japan

Arrup akiyoshiensis Tsukamoto & Shimano

in Tsukamoto, Shimano, Murakami, et al., 2019. 

Arrup akiyoshiensis Tsukamoto & Shimano, sp. n. is described from a limestone cave, Kagekiyo-ana, in Akiyoshi-dai, one of the largest karst regions in Japan, Yamaguchi prefecture. It is distinguishable from 14 valid named congeners by some unique characteristics including entire areolation on the cephalic pleurite, elongation of distal part of female gonopod, and a tubercle on forcipular segment II. In addition, the 18S rRNA gene sequences of A. akiyoshiensis Tsukamoto & Shimano, sp. n. and A. ishiianus, one of the most morphologically similar species, differed by four bp out of 1821 bp. The fact that only troglobionts and troglophilic species are found in the collection site suggests that this new species might be a cave-dweller.

Keywords: Arrupinae, Chilopoda, Kagekiyo-ana, limestone, taxonomy, 18S rRNA gene

Figure 7. Arrup akiyoshiensis sp. n.,
 A–C paratype (TS-20180418-01) D holotype (TS-20180330-01) A whole body, dorsal B head and forcipular segment, dorsal C head and forcipular segment, ventral D head and left antenna, ventral. Scale bar: 1 mm (B–D).


Family Mecistocephalidae Bollmann, 1893
Genus Arrup Chamberlin, 1912

Arrup akiyoshiensis Tsukamoto & Shimano, sp. n.
Japanese name: Kagekiyo-tsumejimukade

Diagnosis: Arrup akiyoshiensis sp. n. can be distinguished from the all named congeners by a combination of the following morphological characteristics: frontal line curved; seven pectinate lamellae in mandible; comma-shaped distal lobe of coxal projection in first maxillae; a tiny tubercle on outer-distal corner of each article of the telopodite; distal article of the telopodite of the second maxillae without claw; the well-developed tooth of forcipular article I; the triangular basal tooth in tarsungulum; the poison calyx overreaching forcipular article I; 31–35 pores on lateral and ventral sides on coxopleura.

Etymology: The species name is derived from the name of Akiyoshi-dai Karst region, which includes the type locality.

Distribution: Known from only the type locality.

Type locality: Kagekiyo-ana, Mitou Town (Mitou-cho), Mine City (Mine-shi), Yamaguchi Prefecture, Japan.

Remarks: Arrup akiyoshiensis sp. n. is morphologically similar to several other congeners, especially A. holstii (Pocock, 1895) and A. ishiianus Uliana, Bonato & Minelli, 2007 (Fig. 10), but can be easily distinguished from them by a combination of the characteristics shown in Table 7.

 Sho Tsukamoto, Satoshi Shimano, Takashi Murakami, Shimpei F. Hiruta, Takeshi Yamasaki and Katsuyuki Eguchi. 2019. A New Species of the Genus Arrup from A Limestone Cave in Akiyoshi-dai, Western Japan (Chilopoda, Geophilomorpha, Mecistocephalidae). ZooKeys. 830: 33-51. DOI: 10.3897/zookeys.830.33060

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