Nepalella siamensis, Likhitrakarn & Golovatch & Panha, 2022
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publication ID |
https://dx.doi.org/10.3897/zookeys.1084.78744 |
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publication LSID |
lsid:zoobank.org:pub:42DE4083-042B-4F1B-ACDD-D126C67ACC87 |
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persistent identifier |
https://treatment.plazi.org/id/3768467C-2FB4-4E2F-88A8-3977AE5ADDFF |
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taxon LSID |
lsid:zoobank.org:act:3768467C-2FB4-4E2F-88A8-3977AE5ADDFF |
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treatment provided by |
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scientific name |
Nepalella siamensis |
| status |
sp. nov. |
Nepalella siamensis sp. nov.
Figs 2 View Figure 2 , 3 View Figure 3 , 4 View Figure 4 , 5 View Figure 5
Holotype.
♂ (CUMZ), Thailand, Sa Kaeo Province, Ta Phraya District, Ta Phraya National Park, 183 m a.s.l., 14°08'22"N, 102°40'11"E, 27.10.2010, leg. N. Likhitrakarn and S.I. Golovatch. The holotype of Nepalella siamensis sp. nov. is housed in the Museum of Zoology, Chulalongkorn University (CUMZ), Bangkok, Thailand.
Etymology.
To emphasize “Siam”, referring to the former name of Thailand as the terra typica; adjective.
Diagnosis.
Differs from the congeners by ♂ femora 3 and 4 each with a small mushroom-like protuberance (mp) ventrally (Fig. 3C View Figure 3 ); ♂ coxa 10 with a conspicuous horn-shaped process (h) dorsally (Fig. 3E, F View Figure 3 ); ♂ coxa 11 with a small, medial, digitiform process (m) and a high, basal, funnel-shaped process (b) (Fig. 3G, H View Figure 3 ); anterior gonopod sternum carrying a median lobe and two small lateral lobules (Figs 4A, B View Figure 4 , 5A View Figure 5 ), coupled with posterior gonopod equipped with a foot-shaped colpocoxite (c) and a rounded bulge (r) at base in frontal view (Figs 4C, D View Figure 4 , 5C, D View Figure 5 ).
Description.
Length of holotype ca 33 mm, maximum width 3.2 mm. Coloration light brown (Fig. 2A, B, D, E, G, H View Figure 2 ); head light brown, venter and legs light yellowish to pallid (Fig. 2C, F, I View Figure 2 ). Eye patches and antennae brownish black (Fig. 2A, C View Figure 2 ).
In width, collum <segment 2 <3 <head with genae = segment 4 <5 <6 <7 = 20; thereafter, body very gradually tapering towards telson.
Body with 30 segments (29 pleurotergites with free sternites, plus telson, or “rings”, in terms of Enghoff et al. (1993, 2015)).
Head densely setose, clypeolabral region slightly convex. Eye patches triangular, each composed of 27 and 28 convex ommatidia (Fig. 2A, C View Figure 2 ).
Antennae very long and slender (Figs 2A View Figure 2 , 3A View Figure 3 ), reaching past body segment 6 when stretched posteriorly; antennomere 7 with four apical cones.
Gnathochilarium without promentum (Fig. 3A View Figure 3 ).
Collum as usual (for heterochordeumatoideans), obcordate in shape, with rudimentary paraterga (Fig. 2A View Figure 2 ). Tegument smooth, shining, only prozonae distinctly and densely striolate transversely (Fig. 2D, E View Figure 2 ). Metatergal setation 3 + 3, typical of Chordeumatida ; macrochaetae long, rather thick, pointed, placed on clear knobs (Fig. 2A, B, D, E, G, H View Figure 2 ); stricture between pro- and metazona shallow, inconspicuous (Fig. 2A, D, E, G, H View Figure 2 ). Paraterga poorly developed, with small dorsolateral bulges in anterior part of body (Fig. 2B View Figure 2 ), following segments rather regularly rounded in dorsal view (Fig. 2D, E, H View Figure 2 ).
CIX (ring 15) = 0.62; MIX (ring 15) = 0.87; MA (ring 15) ≈ 145°; PIX impossible to evaluate due to insufficiently developed paraterga. Axial suture distinct, pallid, as usual (Fig. 2B, D, E, H View Figure 2 ).
♂ legs long and slender, ca 1.5 times as long as midbody height. Legs 1 and 2 slightly reduced, tarsi with usual ventral brushes, but without papillae; ♂ coxa 2 with a distal mediocaudal cone perforated by gonopore orifice. All following legs conspicuously papillate on ventral face of tarsi (Fig. 3C, D, E, G, I View Figure 3 ). ♂ legs 3-7 distinctly and increasingly crassate, pairs 3 and 4 particularly so. Femora 3 and 4 each with a small, but evident mushroom-shaped protuberance (mp) at midway ventrally (Fig. 3C View Figure 3 ). Coxa 7 with a small, but evident distoventral digitiform outgrowth (Fig. 3D View Figure 3 ).
♂ legs 10 and 11 each with a small coxal gland (cg) (Fig. 3E-H View Figure 3 ); each coxa 10 dorsally with a large horn-shaped process (h) conspicuously enlarged at base (Fig. 3E, F View Figure 3 ); each coxa 11 with a small, medial, digitiform process (m) and a high, basal, funnel-shaped process (b) (Fig. 3G, H View Figure 3 ); prefemur 11 with a small parabasal process (p) ventrally (Fig. 3G, H View Figure 3 ). Claws simple, rather long.
Anterior gonopods (♂ leg-pair 8) very strongly reduced, sternum with a median lobe (ml) distally in oral view and with two small lateral lobules (ll); coxites (cxi) long, slender and horn-shaped (Figs 4A, B View Figure 4 , 5A, B View Figure 5 ).
Posterior gonopods (♂ leg-pair 9) (Figs 4C, D View Figure 4 , 5C, D, E, F View Figure 5 ) hypertrophied, each with a prominent, foot-shaped colpocoxite (c), this being higher than telopodite, and with three evident longitudinal lamellae in caudal view; a rather conspicuous lateral lobe (cl) at midway in caudal view; with a rounded bulge (r) at base in frontal view; telopoditomere 1 (t1) particularly strongly setose on posterior face, expanded apically, telopoditomere 2 (t2) subpyriform, likewise voluminous, only slightly setose laterally in basal half.
Remark.
The specimen was collected by hand while it was moving very fast on the leaf litter surface. The type locality is situated in a dipterocarp forest on the side of a road near the Ta Phraya Waterfall. The species was found syntopically together with Antheromorpha uncinata (Attems, 1931) ( Paradoxosomatidae , Polydesmida ) ( Likhitrakarn et al. 2016).
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