Plusioglyphiulus biserratus, 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/4DA3B03C-6349-4265-AC3C-111AF53FFD19 |
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taxon LSID |
lsid:zoobank.org:act:4DA3B03C-6349-4265-AC3C-111AF53FFD19 |
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treatment provided by |
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scientific name |
Plusioglyphiulus biserratus |
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sp. nov. |
Plusioglyphiulus biserratus sp. nov. Figures 1B View Figure 1 , 2 View Figure 2 , 3 View Figure 3
Material examined.
Holotype ♂ (CUMZ-CAM183), Cambodia, Kampot Province, Tuek Chhou District, Phnom Kbal Romeas Cave (locality code C045), 10°37'0"N, 104°14'38"E, 16.08.2019, leg. E. Jeratthitikul and R. Srisonchai.
Paratypes. 2 ♂, 3 ♀ (CUMZ-CAM183), 1 ♂, 1 ♀ (ZMUM), 1 ♂, 1 ♀ (NHMD), 1 ♂, 1 ♀ (ZRC), same locality, together with holotype.
Name.
To emphasize the telopodites of the posterior gonopods being clearly serrate apicolaterally; adjective.
Diagnosis.
This new species is distinguished from all congeners by its anterior gonopod structure: in having only a pair of single coxosternal processes (cxp) (Fig. 3H, I View Figure 3 ) it is especially similar to that observed in P. hoffmani Golovatch, Geoffroy, Mauriès & VandenSpiegel, 2009, but both these species differ in cxp being smooth and distally curved in P. biserratus sp. nov. vs serrate and suberect in P. hoffmani . The posterior gonopods of P. biserratus sp. nov. are unique in showing laterally fringed/serrate telopodites (te), both elongate and membranous (Fig. 3J, K View Figure 3 ), and ♂ legs 1 with very long, slender and one-segmented telopodites (Fig. 3D, E View Figure 3 ).
Description.
Length of holotype ca 24 mm; adult paratypes 21.5-26.2 mm (♂) or 21.5-32.8 mm (♀); midbody segments round in cross-section (Fig. 2F View Figure 2 ), their width (horizontal diameter) and height (vertical diameter) similar, width in holotype 1.4 mm; paratypes 1.3-1.5 mm (♂) or 1.4-1.8 mm (♀).
Coloration of live animals light brown (Fig. 1B View Figure 1 ) with lighter anterior and posterior parts of body; antennae, venter and legs light yellowish; coloration in alcohol, after six months of preservation (Fig. 2 View Figure 2 ), uniformly red-brownish or dark castaneous brown to grey-brown, dorsal crests and porosteles usually dark brownish. Antennae and venter yellow-brownish to brownish (Fig. 2A-C, E-G, I View Figure 2 ). Eyes brown to blackish (Fig. 2A, C View Figure 2 ).
Adult body with 43p+4a+T (holotype); paratypes with 43-53p+2-5a+T (♂) or 50-58p+2-3a+T (♀). Eye patches transversely ovoid, with 7-11 rather flat ommatidia arranged in three longitudinal rows (Fig. 2A, C View Figure 2 ). Clypeus with three teeth anteromedially (Fig. 2C View Figure 2 ).
Antennae short and clavate (Figs 1B View Figure 1 , 2A, C View Figure 2 , 3C View Figure 3 ), extending behind segment 4 laterally, antennomeres 5 and 6 each with a small apicodorsal field or corolla of bacilliform sensilla (Fig. 3C View Figure 3 ). Gnathochilarium oligotrichous, each lamella lingualis with four or five setae; promentum bare, separated from eumentum by a distinct suture (n = 2) (Fig. 3A View Figure 3 ).
Postcollum constriction evident, but collum moderately enlarged (Figs 1B View Figure 1 , 2A-C View Figure 2 ). Carinotaxic formula of collum: (1a)/t+2p/t+3p/t+4p/t/t+ta/t+5p/t/t+ta/t+pp/t/t+m/m (Figs 2A-C View Figure 2 , 3B View Figure 3 ). Carinotaxy of metatergum 2, 8/8+m/m+8/8; of metaterga 3 and 4, 7/7+m/m+7/7 (Fig. 2A, B View Figure 2 ); formula on 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. 2A, B, D-H View Figure 2 ); of legless segments/rings, usually 7+m+7 (Fig. 2G, H View Figure 2 ); all crests and tubercles, including poriferous cones, rather low. Dorsal crests on several posteriormost segments slightly lower than others (Fig. 2A, B, D-H View Figure 2 ). Midbody segments ovoid in cross-section, almost not compressed laterally (Fig. 2F View Figure 2 ). Porosteles large, rather low, conical, round, directed caudolaterad, higher than wide (Fig. 2D-F View Figure 2 ).
Tegument finely alveolate-areolate (Fig. 2A, B, D, E, G, H View Figure 2 ), dull throughout. Metatergal setae absent. Pleural regions of segments 2-4 conspicuously elongated, flap-shaped, especially clearly so on segment 3 (Fig. 2A, C View Figure 2 ). Limbus very finely and rather regularly denticulate, thin (Fig. 2A, B, D, E, G, H View Figure 2 ).
Epiproct (Fig. 2G-I View Figure 2 ) broadly rounded apically, with 2+2 paramedian tubercles, median tubercles being higher than lateral ones. Paraprocts rather clearly flattened, each with a faint premarginal sulcus medially (Fig. 2G, I View Figure 2 ). Hypoproct clearly emarginate at caudal margin (Fig. 2I View Figure 2 ).
Ventral flaps behind gonopod aperture on male segment 7 distinguishable as low swellings with rounded flaps bent abruptly caudad.
Legs short, nearly as long as body diameter (Figs 2F View Figure 2 , 3L View Figure 3 ), claw at base with a strong, spiniform, accessory claw almost half as long as claw itself (Fig. 3L View Figure 3 ).
Male legs 1 with a usual strong and long central hook (actually a pair of tightly appressed hooks) regularly curved forward; a pair of strong, sac-shaped, one-segmented telopodites, the latter being nearly as long as central hook (Fig. 3D, E View Figure 3 ).
Male legs 2 strongly enlarged, with high and large coxae; telopodites hirsute on anterior face; penes broad, oblong-subtrapeziform, fused at base (Fig. 3F View Figure 3 ).
Male legs 3 modified as usual, with particularly elongate and slender coxae, and shortened telopodites (Fig. 3G View Figure 3 ).
Anterior gonopods (Fig. 3H, I View Figure 3 ) simple, coxosternum halves being touching but not really fused medially; each coxite bearing only a single, digitiform, coxosternal process (cxp) with an unciform and laterad directed tip, and a few strong setae medially near base; telopodites (te) simple, lateral in position, movable, one-segmented, digitiform, rounded and bearing several apical setae at tip, shorter than cxp.
Posterior gonopods (Fig. 3J, K View Figure 3 ) highly compact, simple, coxosternum also contiguous, but not fused medially; each coxite with a long, slender, distally slightly curved, paramedian, coxal process (pp); anterior coxal process (ap) suberect, distally with three long, slender, flagelliform branches differing in length; telopodite (te) elongate, membranous, laterally clearly fringed/serrate, distinctly shorter than both pp and ap, with a parabasal roundish field of microsetae on anterior face.
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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