Plusioglyphiulus khmer, Likhitrakarn & Golovatch & Thach & Chhuoy & Ngor & Srisonchai & Sutcharit & Panha, 2020
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publication ID |
https://dx.doi.org/10.3897/zookeys.938.51234 |
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publication LSID |
lsid:zoobank.org:pub:C57570A1-4A48-4EA3-889E-0646632DCA9B |
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persistent identifier |
https://treatment.plazi.org/id/7721A428-FA76-4226-9E3E-42CF2100475B |
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taxon LSID |
lsid:zoobank.org:act:7721A428-FA76-4226-9E3E-42CF2100475B |
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treatment provided by |
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scientific name |
Plusioglyphiulus khmer |
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sp. nov. |
Plusioglyphiulus khmer sp. nov. Figures 1C View Figure 1 , 4 View Figure 4 , 5 View Figure 5
Type material.
Holotype ♂ (CUMZ-CAM186), Cambodia, Kep Province, Damnak Chang’aeur District, Ou Krasar, Phnom Sorsia Temple (locality code C047), 10°33'54"N, 104°17'2"E, 16.09.2019, leg. E. Jeratthitikul and R. Srisonchai.
Paratypes. 16 ♂, 17 ♀, 6 juveniles (CUMZ-CAM186), 2 ♂, 2 ♀ (ZMUM), 2 ♂, 2 ♀ (NHMD), 2 ♂, 2 ♀ (ZRC), same locality, together with holotype.
Name.
To emphasize " khmer ", referring to the main people of Cambodia; a noun in apposition.
Diagnosis.
This new species differs from all congeners by all crests on the collum being undivided, mostly complete (Fig. 5B View Figure 5 ) and male legs 1 with very long and one-segmented telopodites (Fig. 5D, E View Figure 5 ), as well as by the presence of 2+2 paramedian, characteristically long, slender, coxosternal processes of the anterior gonopods, a shorter and only apically curved posterior (cxp1) pair, and a longer, mesally micropapillate and regularly curved anterior (cxp2) one (Fig. 5H, I View Figure 5 ); the posterior gonopods are oblong-subtrapeziform, membranous, each with a small apical spike (d) and a bifid process (k) at about 1/3 telopodite length on anterior face (Fig. 5J, K View Figure 5 ).
Description.
Length of holotype ca 26 mm; adult paratypes 19.3-25.4 (♂) or 14.1-27.0 mm (♀), juveniles 8.5-11.5 mm long; midbody segments round in cross-section (Fig. 4F View Figure 4 ), their width (horizontal diameter) shorter than height (vertical diameter), width in holotype 1.2 mm; paratypes 1.1-1.5 (♂), 1.1-1.6 mm (♀) or 0.8-1.1 mm (juveniles).
Coloration of live animals light brown to chocolate brown (Fig. 1C View Figure 1 ) with blackish or dark brown anterior and posterior parts of body; antennae light brown to brown; venter and legs light yellowish to yellowish white; rather contrasting dark brownish, lateral, longitudinal stripes above ozopores on each side, both interrupted mid-dorsally by a light wide axial stripe; ommatidia brown to blackish (Fig. 4A, C View Figure 4 ); coloration in alcohol, after six months of preservation (Fig. 4 View Figure 4 ), similar to live one, but body red-brownish or dark castaneous brown to grey-brown; vertex dark brown to yellow-brown; antennae dark brown to blackish; venter and legs light yellowish to yellowish red (Fig. 4A-C, E-G, I View Figure 4 ).
Adult body with 53p+2a+T (holotype); paratypes with 46-57p+1-3a+T (♂), 44-55p+2-4a+T (♀) or 35-42+3-4a +T (juveniles). Eye patches transversely ovoid, with 11-18 ommatidia arranged in three or four longitudinal rows (adult) (Fig. 4A, C View Figure 4 ) or with 6-10 ommatidia in three longitudinal rows (juveniles). Clypeus with three teeth anteromedially (Fig. 4C View Figure 4 ).
Antennae short and clavate (Figs 1C View Figure 1 , 4A, C View Figure 4 , 5C View Figure 5 ), extending behind segment 3 laterally, antennomeres 5 and 6 each with a small apicodorsal field or corolla of bacilliform sensilla (Fig. 5C View Figure 5 ). Gnathochilarium oligotrichous, each lamella lingualis with two or three setae; promentum bare, separated from eumentum by a distinct transverse suture (n = 2) (Fig. 5A View Figure 5 ).
Postcollum constriction evident, but collum only moderately enlarged (Figs 1C View Figure 1 , 4A-C View Figure 4 ). Carinotaxic formula of collum: 1+ta+2+3+4+ta+5(5p/t)+ta+P+ma (Figs 4A-C View Figure 4 , 5B View Figure 5 ). Carinotaxy of metatergum 2, 8/8+m/m+8/8; of metaterga 3 and 4, 7/7+m/m+7/7 (Fig. 4A, B View Figure 4 ); formula of metaterga 5 and following metaterga, except last few, usually 3/3+I/i+3/3/3+m/m+3/3/3+I/i+3/3 (Fig. 4A, B, D-H View Figure 4 ); of legless segments, usually 7+m+7 (Fig. 4G, H View Figure 4 ); all crests and tubercles, including poriferous cones, rather low. Dorsal crests on several posteriormost segments lower than others (Fig. 4A, B, D-H View Figure 4 ). Porosteles large, low, conical, round, directed caudolaterad, wider than high (Fig. 4D-H View Figure 4 ).
Tegument finely alveolate-areolate (Fig. 4A, B, D, E, G, H View Figure 4 ), dull throughout. Metatergal setae absent. Pleural regions of segments 2-4 conspicuously elongated, flap-shaped, especially well so on segment 3 (Fig. 4A View Figure 4 ).
Epiproct (Fig. 4G-I View Figure 4 ) broadly rounded apically, with 2+2 small, paramedian tubercles at midway. Paraprocts rather clearly flattened, each with a faint premarginal sulcus medially (Fig. 4G, I View Figure 4 ). Hypoproct clearly emarginate at caudal margin (Fig. 4I View Figure 4 ).
Ventral flaps behind gonopod aperture on male segment 7 evident, distinguishable as rather high swellings with rounded flaps bent abruptly caudad (Fig. 4C View Figure 4 ).
Legs short, on midbody segments about 1/3 as long as body diameter (Figs 4E-G View Figure 4 , 5L View Figure 5 ), claw at base with a strong, spiniform, accessory claw about 1/3 as long as claw itself (Fig. 5L View Figure 5 ).
Male legs 1 with a usual, strong, central hook (actually a double structure of tightly appressed hooks), regularly curved forward; a pair of 1-segmented, sac-shaped and very long telopodites, the latter almost as long as central hook (Fig. 5D, E View Figure 5 ).
Male legs 2 strongly enlarged, with very high and large coxae; telopodites hirsute on anterior face; penes subconical, truncate apically, fused at base (Fig. 5F View Figure 5 ).
Male legs 3 modified as usual, with particularly elongate and slender coxae and shortened telopodites (Fig. 5G View Figure 5 ).
Anterior gonopods (Fig. 5H, I View Figure 5 ) rather complex, with 2+2 paramedian, long, slender, coxosternal processes: a shorter and only apically curved posterior (cxp1) pair, and a longer, mesally micropapillate and regularly curved anterior (cxp2) one (Fig. 5H, I View Figure 5 ); telopodites (te) finger-shaped, subcylindrical, long, apically setose, about as high as cxp2, attached to coxal region caudolaterally, probably capable of movement.
Posterior gonopods (Fig. 5J, K View Figure 5 ) rather long (high), simple; coxites well-separated from sternum, fused only basally, oblong-subtrapeziform, membranous, with traces of telopodites in the form of a small, latero-parabasal field of microsetae on posterior face of each gonopod; each coxite with a terminal medial spike (d), a subterminal lobule at d base, and a small bifid process (k) at about 1/3 coxite length on frontal face; distal half lamellose, fringed and with a deep fovea subapically.
Remarks.
This species was found together with a single male specimen of Orthomorpha coarctata (De Saussure, 1860).
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.