Nagaxytes spatula Srisonchai, Enghoff & Panha, 2018
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publication ID |
https://doi.org/ 10.5852/ejt.2018.462 |
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publication LSID |
urn:lsid:zoobank.org:pub:60992A95-1F59-4407-9774-B8FC1545A8B4 |
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DOI |
https://doi.org/10.5281/zenodo.5946414 |
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persistent identifier |
https://treatment.plazi.org/id/6B8E3EA4-8290-4EF4-A804-FCA28BE32863 |
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taxon LSID |
lsid:zoobank.org:act:6B8E3EA4-8290-4EF4-A804-FCA28BE32863 |
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treatment provided by |
Plazi |
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scientific name |
Nagaxytes spatula Srisonchai, Enghoff & Panha |
| status |
gen. et sp. nov. |
Nagaxytes spatula Srisonchai, Enghoff & Panha View in CoL gen. et sp. nov.
urn:lsid:zoobank.org:act:6B8E3EA4-8290-4EF4-A804-FCA28BE32863
Figs 22–26 View Fig. 22 View Fig. 23 View Fig. 24 View Fig. 25 View Fig. 26
Diagnosis
Metaterga 2–8 with two rows of spines (1+1 or 2+2 spines in anterior row, 2+2 spines in posterior row). Similar in this respect to N. erecta gen. et sp. nov., but differs by having: degree of elevation of paraterga higher; apical tubercles of epiproct inconspicuous; surface near lateral sulcus swollen as long ridge; lamina lateralis broad, with a long and conspicuous spatula-like lobe; lamina medialis very long, curved, apically hook-like; tip of solenomere terminating in two curved processes.
Etymology
The name is a Latin noun in apposition, referring to the spatulate lobe on the lamina lateralis.
Material examined
Holotype THAILAND: ♂, Tak Province, Mae Sot District, Chao Por Phawo Shrine , 16°46′19″ N, 98°41′11″ E, ca. 688 m a.s.l., 29 Aug. 2016, ASRU members leg. ( CUMZ-pxDGT00119 ). GoogleMaps
Paratypes THAILAND: 27 ♂♂, 19 ♀♀, same data as for holotype ( CUMZ-pxDGT00120-165 ); 1 ♂, 1 ♀, same data as for holotype (ZMUC 00040246 ) ; 1 ♂, 1 ♀, same data as for holotype ( ZMUM) ; 1 ♂, 1 ♀, same data as for holotype ( NHMW) ; 1 ♂, 1 ♀, same data as for holotype ( NHMUK) .
Further specimens, not paratypes
THAILAND – Tak Province: Mae Sot District: 1 ♀, Chao Por Phawo Shrine , 16°46′19″ N, 98°41′11″ E, ca. 688 m a.s.l., 29 Jun. 2015, ASRU members leg. ( CUMZ); GoogleMaps 1 ♂, 1 ♀, Wat Tham Inthanin , 16°45′59″ N, 98°40′21″ E, 671 m a.s.l., 18 Oct. 2015, ASRU members leg. ( CUMZ); GoogleMaps 10 broken specs, Wat Pho Thi Khun ( Wat Huai Toey ), 16°45′42″ N, 98°38′49″ E, ca. 431 m a.s.l., 27 Jul. 2016, P. Pimvichai, P. Prasankok and N. Nantarat leg. ( CUMZ); GoogleMaps 3 ♂♂, 6 ♀♀, Wat Pho Thi Khun ( Wat Huai Toey ), 16°45′42″ N, 98°38′49″ E, ca. 431 m a.s.l., 29 Aug. 2016, ASRU members leg. ( CUMZ). GoogleMaps – Umphang District: 1 ♂, 1 ♂ (left gonopod lost), 4 ♀♀, Tham Takhobi ( Takhobi Cave ), 16°03′15″ N, 98°49′14″ E, ca. 510 m a.s.l., 5 Jul. 2009, ASRU members leg. ( CUMZ); GoogleMaps 1 ♂, 1 ♀, Tham Takhobi ( Takhobi Cave ), 16°03′15″ N, 98°49′14″ E, ca. 510 m a.s.l., 1 Jul. 2015, ASRU members leg. ( CUMZ); GoogleMaps 4 ♂♂, 6 ♀♀, many broken specs, Doi Hua Mod , 15°57′30″ N, 98°51′13″ E, ca. 894 m a.s.l., 5 Jul. 2009, ASRU members leg. ( CUMZ); GoogleMaps 1 ♂, 1 ♀, 1 juvenile, Doi Hua Mod , 15°57′30″ N, 98°51′13″ E, ca. 894 m a.s.l., 1 Jul. 2015, ASRU members leg. (CUMZ). GoogleMaps
Description
SIZE. Length 22–26 mm (male), 24–28 mm (female); width of midbody metazona ca. 2.0 mm (male), 2.8 mm (female). Width of head <collum = body ring 2 = 3 = 4 <5–17, thereafter body gradually tapering towards telson.
COLOUR ( Fig. 22A–C View Fig. 22 ). Specimens in life with body usually reddish brown (some specimens brown); prozona, metaterga, surface below paraterga and sterna reddish brown; antennae brown to dark brown (except whitish distal part of antennomere 7 and antennomere 8); head, paraterga, epiproct and leg brown; a few basal podomeres pale brown. Colour in alcohol: after 3–10 years changed to pale brown; head, antennae, collum, metaterga, surface below paraterga, sterna, epiproct, legs pale brown or whitish brown; paraterga brownish white.
COLLUM ( Fig. 23A View Fig. 23 ). With three transverse rows of setiferous tubercles and spines, 3+3 tubercles in anterior row, 1+1 tubercles in intermediate row and 2+2 spines in posterior row; paraterga of collum long and broad, elevated at ca. 25°–35° (male) 20°–30° (female), directed caudolaterad, with two conspicuous notches at lateral margin.
ANTENNAE ( Fig. 23D View Fig. 23 ). Very long and slender, reaching to body ring 6 or 7 (male) and 5 or 6 (female) when stretched dorsally.
TEGUMENT. Quite dull. Stricture between prozona and metazona quite deep, wide.
METATERGA ( Fig. 23A–C View Fig. 23 ). Male – metaterga 2–8 with 2(1)+2(1) anterior spines and 2+2 posterior spines (anterior spines small and sometimes inconspicuous; posterior spines longer and larger than anterior ones; lateral spines of posterior row very long); metaterga 9–19 with?1+?1 anterior small tubercles and 2+2 posterior spines (lateral spines of posterior row very long). Female – metaterga 2–10 with 2+2 anterior spines and 2+2 posterior spines (posterior spines longer and larger than anterior ones; lateral spines of posterior row very long); metaterga 11–18 with 1+1 anterior spines and 2+2 posterior spines (lateral spines of posterior row very long); metatergum 19 with?1+?1 anterior small tubercles and 2+2 posterior spines.
PLEUROSTERNAL CARINAE. On body ring 2 long, crest-like; on ring 3 long ridges; on ring 4 small ridges; thereafter missing.
PARATERGA ( Figs 23F–G View Fig. 23 , 24B View Fig. 24 ). Directed caudolaterad on body rings 2–18, elevated at ca. 50°–60° (male) 45°–50° (female), directed increasingly caudad on body ring 19.
TELSON ( Fig. 24C–G View Fig. 24 ). Epiproct quite short; tip subtruncate; lateral setiferous tubercles conspicuous, long, digitiform; apical tubercles inconspicuous. Hypoproct subtriangular, short and broad; caudal margin round, with conspicuous setiferous tubercles.
STERNA ( Fig. 24H–J View Fig. 24 ). Cross-impressions shallow. Sternal lobe between male coxae 4 stout; base broad; tip deeply emarginate to incompletely bilobed.
GONOPODS ( Figs 25 View Fig. 25 , 26 View Fig. 26 ). Coxa shorter than femur. Cannula quite short and stout. Telopodite quite short and stout. Prefemoral part subequal in length to femur. Femur quite stout, slightly enlarged distad. Mesal sulcus conspicuous, deep, wide; lateral sulcus quite shallow and wide, surface near lateral sulcus swollen as long ridge. Postfemoral part conspicuous, wide, laterally demarcated from femur by a long ridge. Solenophore well-developed: lamina lateralis broad; with a long, flattened, conspicuous spatulate lobe, apically round, directed anteriad ( Figs 25D View Fig. 25 , 26C View Fig. 26 ); lamina medialis very long; curved; apically hooklike. Solenomere long, tip terminating in two curved processes.
Distribution and habitat
Known only from Tak Province. Almost all specimens were seen crawling on rocks, some on leaf litter in limestone habitats. Some juveniles were collected from the leaf litter (probably in moulting chambers). In the field, the specimens blended perfectly with brown rocks and leaf litter.
The type locality for this species is situated beside road no. 12 (Tak –Mae Sot) near Khun Phawo National Park. We noticed that the forest beside the road is being destroyed for road construction, some parts of the limestone forest are being cut down.
For the time being, only five recorded locations are reported in the quite narrow distribution range of this species. After several intensive surveys we consider N. spatula gen. et sp. nov. to be endemic to Tak Province, Thailand.
Remarks
We divide this species into two main populations, each restricted to a separate limestone areas:
– North populations: Chao Por Phawo Shrine, Wat Tham Inthanin and Wat Pho Thi Khun (Wat Huai Toey).
– South populations: Tham Takhobi (Takhobi Cave) and Doi Hua Mod.
Specimens of the North populations (24–26 mm in male, 26–28 mm in female) seem to be longer than those of the South populations (22–24 mm in male, 24–25 mm in female). However, other morphological characteristics, especially gonopod characters, are identical.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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