Orthomorpha lauta Golovatch, 1998

Likhitrakarn, Natdanai, Golovatch, Sergei I. & Panha, Somsak, 2011, Revision of the Southeast Asian millipede genus Orthomorpha Bollman, 1893, with the proposal of a new genus (Diplopoda, Polydesmida, Paradoxosomatidae), ZooKeys 131, pp. 1-161 : 77-79

Orthomorpha lauta Golovatch, 1998 Figs 8690

Orthomorpha lauta Golovatch 1998: 37 (D).

Orthomorpha lauta - Enghoff 2005: 97 (M, R).

Holotype.

♂(ZMUC), Thailand, Krabi Prov., road between Krabi and Phuket, 10 km north of Krabi, 8°09'N, 98°50'E, lowland tropical rainforest, <200 m, 13.10.1991, leg. M. Andersen, O. Martin & N. Scharff.

Other material examined.

2 ♂, 2 ♀ (ZMUC), 2 ♂, 2 ♀ (ZMUM), 15 ♂, 16 ♀ (CUMZ), Thailand, Surat Thani Prov., Kanchanadit Distr., Tham Khao Phanomwang, 9°09'24"N, 100°0'25"E, 10.10.2008, leg. S. Panha, N. Likhitrakarn & R. Chanabun. 1 ♂ (CUMZ), Surat Thani Prov., Ko Samui Distr., Na Mueang Waterfall, 27.01.2006, leg. C. Sutcharit. 2 ♂, 2 ♀ (CUMZ), same locality, 06.06.2009, leg. N. Likhitrakarn. 1 ♂ (CUMZ), same Distr., Hinlard Waterfall, 27.10.2006, leg. C. Sutcharit. 1 ♂ (CUMZ), Krabi Prov., Ao Luek Distr., Tham Sra Yuan Thong, 8°36'31"N, 99°14'58"E, 09.10.2006, leg. C. Sutcharit. 2 ♂, 2 ♀ (CUMZ), same Prov., Mueang Krabi Distr., Tham Suae Temple, 8°10'69"N, 98°92'22"E, 07.10.2006, leg. C. Sutcharit. 2 ♂, 4 ♀, 3 juv. (CUMZ), same locality, 15.01.2009, leg. N. Likhitrakarn. 1 ♂, 2 ♀ (CUMZ), same Distr., Forest Reseach Station, 8°08'28"N, 98°51'11"E, 16.01.2009, leg. R. Chanabun. 3 ♂, 2 ♀ (CUMZ), same Prov., Khlong Thom Distr., Samorakot, 7°55'22 " N, 99°15'35"E, 15.01.2009, leg. N. Likhitrakarn. 1 ♂, 1 ♀(CUMZ), Trang Prov., Na Yong Distr., Khao Chang Botanical Garden, ca 50 m, 7°32'45"N, 99°46'27"E, 14.01.2009, leg. N. Likhitrakarn. 2 ♂ (CUMZ), same Distr., Tham Khao Chang Hai, ca 40 m, 7°35'25"N, 99°40'07"E, 13.01.2009, leg. N. Likhitrakarn. 1 ♂, 2 ♀ (CUMZ), same Distr., Chao Priests Residence, ca 60 m, 7°33'57"N, 99°46'27"E, 28.01.2006, leg. C. Sutcharit. 4 ♂, 3 ♀ (CUMZ), same locality, 14.01.2009, leg. C. Sutcharit & N. Likhitrakarn. 4 ♂ (CUMZ), Phatthalung Prov., Khuan Khaum Distr., Tham Wang Thong Temple, ca 10 m, 7°40'53"N, 100°0'56"E, 11.01.2009, leg. C. Sutcharit & N. Likhitrakarn. 1 ♂, 2 juv. (CUMZ), same Prov., Mueang Phatthalung Distr., Tham Malai Thep Nimit Priest Residence, ca 20 m, 7°38'08"N, 100°05'04"E, 11.01.2009, leg. C. Sutcharit & N. Likhitrakarn. 3 ♂, 3 ♀ (CUMZ), same Distr., Tham Kuhasawan, ca 20 m, 7°37'12"N, 100°04'51"E, 12.01.2009, leg. C. Sutcharit & N. Likhitrakarn. 1 ♂, 1 ♀ (CUMZ), Satun Prov., Khuan Don Distr., Thale Ban National Park, ca 60 m, 6°42'41"N, 100°10'09"E, 13.10.2009, leg. C. Sutcharit & N. Likhitrakarn. 3 ♂, 1 ♀, 1 juv. (CUMZ), Songkhla Prov., Rattaphum Distr., Tham Sri Kesorn, ca 50 m, 7°04'38"N, 100°09'56"E, 12.01.2009, leg. N. Likhitrakarn. 1 ♀ (CUMZ), same Prov., Hat Yai Distr., Tonngachang Waterfall, ca 110 m, 6°56'54"N, 100°14'08"E, 12.01.2009, leg. C. Sutcharit & N. Likhitrakarn. 2 ♂, (CUMZ), Malaysia, Perlis, Wang Kelian, 7°08'07"N, 100°19'24"E, 26.03.2009, leg. C. Sutcharit. 1 ♂ (CUMZ), Penang, Balik Pulau, 5°38'13"N, 100°21'38"E, 25.03.2009, leg. C. Sutcharit. 2 ♂, 1 ♀ (CUMZ), Kelantan, Bukit Landak, 5°26'N, 102°27'E, 11.12.2007, leg. C. Sutcharit.

Descriptive notes.

Length 35-49 (♂) or 35-52 mm (♀), width of midbody pro- and metazona 3.1-4.1 and 5.0-6.5 mm (♂), 3.4-4.8 and 5.0-7.1 mm (♀), respectively.

Coloration of live animals (Fig. 87A) dark castaneous brown with contrasting light yellowish paraterga and tip of epiproct; coloration upon long-term preservation in alcohol sometimes slightly faded, ranging from light brown or medium red-brown with more or less contrasting pallid to yellowish-brown paratergal calluses and epiproct, up to blackish-brown with contrasting light brown to grey-yellow calluses and epiproct (Fig. 87A-F & I-N); front halves of prozona (especially dorsally), caudal edges of metaterga and legs, sometimes also venter, flavous, light yellow-brown to brownish (Figs 86 & 87).

Collum with caudal corner of paraterga ranging from obtusangular (described as being about 100˚ in holotype, Fig. 86A & B), via subrectangular (Fig. 87C), to evidently acutangular. Calluses of paraterga mostly broad and extending behind tergal margin, increasingly well so on segements 7(8)-19, but sometimes slightly narrower and not surpassing it, forming instead a subrectangular turn mesally (Figs 86A-G, 87A-F & I-N). Caudal corner of paraterga remaining from acute and pointed thoughout (♂ from Tham Khao Phanomwang Temple, Fig. 87N) to mostly narrowly rounded (♂ from Tham Sri Kesorn, Fig. 87I), with all intergradations in-between (Figs 86A, C & F, 87A, B, D, E & J-M).

Metatergal sulcus visible on segments 5-18, more rarely incomplete also on segment 19 (holotype). Pleurosternal carinae expressed as complete high crests with a sharp caudal tooth on segment 2, thereafter increasingly well divided into a front bulge and a caudal tooth, the latter sharp or rounded, on segments 2-7; both front bulge and caudal tooth increasingly strongly reduced either until segment 10 (11), with a small sharp tooth until segment 16 (17) (♂), or expressed as complete high crests with a sharp caudal tooth on segments 2-4, thereafter increasingly well divided into a front bulge and a caudal tooth, sharp or rounded, on segments 5-10, a small sharp tooth until segment 16 (17) (♀). Midbody legs ca 1.1-1.3 (♂) or 0.9-1.2 times (♀) as long as body height.

Base of lamina lateralis with a small, but conspicuous ventral knob (like in Orthomorpha fluminoris ). Tip of gonopod with terminal lobule longest, bearing microdenticulations or a more or less evident fringe at external edge (Fig. 89C & D). Middle spiniform prong sometimes slightly smaller than usual (Fig. 90).

Remark.

This species appears to be widespread in southern Thailand (Map 4).