Orthomorpha battambangiensis Likhitrakarn, 2025
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publication ID |
https://doi.org/10.3897/zookeys.1251.158776 |
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publication LSID |
lsid:zoobank.org:pub:9DEED866-2FE6-430F-BB49-42CC7EF0A4DD |
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DOI |
https://doi.org/10.5281/zenodo.17094776 |
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persistent identifier |
https://treatment.plazi.org/id/7F18A5B1-4814-5124-A6B0-EA4154F90ABB |
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treatment provided by |
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scientific name |
Orthomorpha battambangiensis Likhitrakarn |
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sp. nov. |
Orthomorpha battambangiensis Likhitrakarn sp. nov.
Figs 5 C, D View Figure 5 , 9 View Figure 9 , 10 View Figure 10 , 11 View Figure 11
Material examined.
Holotype: ♂ ( CUMZ -PD 0037 ), Cambodia, Battambang Province, Banan District, Phnom Sampov, Killing Cave (locality code C 098), ca 100 m a. s. l., 13°01'21"N, 103°05'55"E, 30. 07. 2024, leg. R. Srisonchai. GoogleMaps Paratypes: 5 ♂♂, 5 ♀♀ ( CUMZ -PD 0037 ), same data, together with holotype GoogleMaps . 1 ♀ ( CUMZ -PD 0037 ), same District, Phnom Sampov, Kdoang Mountain (locality code C 099), ca 120 m a. s. l., 13°00'53"N, 103°05'48"E, 30. 07. 2024, leg. R. Srisonchai GoogleMaps .
Etymology.
The species epithet is an adjective formed from the type locality, Battambang Province, Cambodia.
Diagnosis.
This new species is distinguished by its notably small body size, being the smallest known in the genus Orthomorpha , measuring 12.4–14.6 mm ( ♂) or 17.2–17.8 mm ( ♀) in length, and 1.6–1.8 mm ( ♂) or 2.1–2.3 mm ( ♀) in width at midbody. The gonopod solenophore is complex, best described as trifid, bearing a small median denticle between the long terminal lobe and a smaller subterminal lobule. Additionally, tarsal brushes are present until ♂ legs of ring 9.
Description.
Length 12.4–14.6 mm ( ♂), 17.2–17.8 mm ( ♀), width of midbody pro- and metazona 1.0–1.1 and 1.6–1.8 mm ( ♂) or 1.5–1.7 and 2.1–2.3 mm ( ♀), respectively.
Coloration of live animals dark castaneous brown (Fig. 5 C, D View Figure 5 ), with contrasting pale red or bright orange paraterga and epiproct; antennae dark brownish, venter and legs dark brown to brown; coloration of alcohol material after 10 months of preservation faded to uniformly reddish brown (Fig. 9 A – G View Figure 9 ) with contrasting light yellow paraterga and epiproct; antennae, venter and legs brown to yellowish brown.
Clypeolabral region and vertex sparsely setose, epicranial suture distinct. Antennae long (Fig. 9 B View Figure 9 ), reaching to ring 3 ( ♂, ♀) when stretched dorsally. In width, collum <head <ring 3 <4 <2 <5 <6 <7–16 (Fig. 9 A, C, F View Figure 9 ), thereafter body gently and gradually tapering. Collum with three transverse rows of strong setae: 4 + 4 anterior, 2 + 2 intermediate, and 3 + 3 posterior; a small incision laterally in posterior 1 / 3; caudal corner of paraterga pointed and dentiform; paraterga declined ventrad, not drawn past rear margin.
Tegument generally smooth and shining (Fig. 9 A – F View Figure 9 ), metaterga only at places faintly rugulose, slightly more so near rear margin; prozona very finely shagreened, metazona below paraterga faintly rugulose (Fig. 9 B, D, E View Figure 9 ). Postcollum metaterga with two transverse rows of setae: 2 + 2, mostly abraded setae in anterior (pre-sulcus) row, 3 + 3 in posterior (post-sulcus) one, the latter setae borne on minute tubercles, gradually reduced in size thereafter. Tergal setae simple, rather long, about 1 / 3 metatergal length, mostly abraded. Axial line traceable both on pro- and metazona. Paraterga strongly developed (Fig. 9 A – F View Figure 9 ), lying level to or slightly above dorsum, only on rings 1–4, 18 and 19 either lying clearly below dorsum ( ♂) or all lying slightly below dorsum, set at about half of midbody height, subhorizontal ( ♀), in lateral view moderately enlarged in pore-bearing rings, thinner in poreless ones (Fig. 9 B, D, E View Figure 9 ); shoulders broadly rounded, narrowly bordered, fused to callus; caudal corner narrowly rounded to pointed, slightly drawn past rear tergal margin (Fig. 9 B, D, E View Figure 9 ). Calluses delimited by a sulcus only dorsally. Paraterga 2 broad, anterior edge convex, lateral edge with two acute denticles, one in anterior 1 / 3, the other at midway (Fig. 9 A View Figure 9 ). Each following poreless ring with two incisions, each pore-bearing one with one, often evident incision in front of ozopore. Posterior edge of paraterga oblique, especially clearly so in rings 17–19. Ozopores evident, lateral, lying in an ovoid groove at about 1 / 3 metatergal length in front of posterior edge of metaterga (Fig. 9 D, E View Figure 9 ). Transverse sulcus distinct (Fig. 9 A, C, F View Figure 9 ), slightly incomplete on ring 19, complete and clearly visible on metaterga 5–18, rather deep, reaching the bases of paraterga, line-shaped, beaded at bottom. Stricture between pro- and metazona rather wide, shallow, beaded at bottom down to base of paraterga (Fig. 9 A, C, F View Figure 9 ). Pleurosternal carinae well-developed, as complete, arcuate ridges with distinct caudal denticle on rings 2–8 ( ♂) (Fig. 9 B, D View Figure 9 ) or rings 2–4 ( ♀), as a sharp caudal tooth, the latter gradually reduced in size down to a small tooth until ring 17 ( ♂), or broken into an anterior bulge and a caudal tooth on rings 5–8, retained only as a small, caudal, mostly rounded tooth on rings 9–16 ( ♀), entirely absent thereafter.
Epiproct (Fig. 9 E – G View Figure 9 ) conical, flattened dorsoventrally, with two evident apical papillae; tip subtruncate; pre-apical papillae small, but visible, lying rather close to tip (Fig. 9 F, G View Figure 9 ). Hypoproct nearly semi-circular, 1 + 1 setiferous knobs at caudal edge well-separated and evident (Fig. 9 G View Figure 9 ).
Sterna sparsely setose, without modifications; cross-impressions shallow; with a paramedian pair of evident, anteroventrally directed, rounded prongs between ♂ coxae 4 (Fig. 9 H, I View Figure 9 ). A conspicuous ridge in front of gonopod aperture. Legs long and slender, midbody ones ca 1.3–1.5 ( ♂) or 1.1–1.3 times ( ♀) as long as body height (Fig. 9 B, F View Figure 9 ), prefemora without modifications, ♂ tarsal brushes present until leg 4.
Gonopods stout and suberect (Figs 10 View Figure 10 , 11 View Figure 11 ). Coxite ( cx) rather short, slightly curved caudally, rather densely setose distodorsally (Figs 10 A, B View Figure 10 , 11 A, B View Figure 11 ). Prefemoral part ( pfe) densely setose, less than half the length of acropodite (femoral + postfemoral parts) (Fig. 10 A, B View Figure 10 ). Femoral part ( fe) rather stout, slightly curved and faintly enlarged distad, with a postfemoral part demarcated by an oblique lateral sulcus (Figs 10 A, B View Figure 10 , 11 A, B View Figure 11 ). Tip of solenophore ( sph) faintly bifid (Figs 10 B, C View Figure 10 , 11 A, C, D View Figure 11 ), with a subtruncate and long terminal lobe (Figs 10 View Figure 10 , 11 A – H View Figure 11 ) and a small subterminal lobule (Figs 10 B, C View Figure 10 , 11 A, C, D View Figure 11 ); solenomere ( sl) long and flagelliform (Figs 10 View Figure 10 , 11 A, B, D – H View Figure 11 ).
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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