Coecobrya phitsanulokensis Jantarit & Nilsai, 2021
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publication ID |
https://dx.doi.org/10.3897/subtbiol.41.76926 |
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publication LSID |
lsid:zoobank.org:pub:73326F5C-C4BE-431D-BE6D-601A69BD7FFA |
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persistent identifier |
https://treatment.plazi.org/id/04257381-2AD3-4350-B626-019EFF23903F |
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taxon LSID |
lsid:zoobank.org:act:04257381-2AD3-4350-B626-019EFF23903F |
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treatment provided by |
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scientific name |
Coecobrya phitsanulokensis Jantarit & Nilsai |
| status |
sp. nov. |
Coecobrya phitsanulokensis Jantarit & Nilsai sp. nov.
Figures 1D View Figure 1 , 11 View Figure 11 , 12 View Figure 12 , 13 View Figure 13
Type material.
Holotype: female on slide. Thailand, Phitsanulok province, Noen Mapang district, Tham Yai Nakarat, altitude 85 m a.m.s.l., 16.5052°N, 100.6864°E. 7.X.2019; S. Jantarit, A. Nilsai, K. Sarakhamhaeng and K. Jantapaso leg. (sample # THA_SJ_PLK01), dark zone of a cave, by entomological aspirator. Paratypes: same data as holotype, 7 specimens (3 females and 4 subadults on slides). Additional material: same data as holotype, 13 specimens (in ethanol)
Holotype and seven paratypes on slides deposited in NHM-PSU.
Description.
Habitus (Fig. 1D View Figure 1 ). Medium size Entomobryidae . Body length 1.8-2.3 mm (holotype 1.8 mm). No scales. Eyes absent. Color: whitish in alcohol, without pigmentation. Four antennal segments. Body slender not bent nor humped at the level of Th. II. Th. II slightly larger than Th. III. Abd. IV 3.58-3.88 times as long as Abd. III along the dorsal midline.
Pseudopores (Figs 12H View Figure 12 , 13A, B, D View Figure 13 ). Pseudopores present as round flat disks, smaller than mac sockets, except for the coxae and manubrium where psp are as large as mac sockets, present on various parts of the body: antennae, head, tergites, coxae and manubrium. On antennae, psp located ventro-apically between the tip of antennal segments and the chaetae of the apical row, or just below the apical row of chaetae (2 psp on Ant. I, 2-3 psp on Ant. II, and 3 psp on Ant. III). On the head, 1-2 psp located externally on each peri-antennal area. On tergites, 1+1 psp close to the axis from Th. II to Abd. IV (Figs 13A, B View Figure 13 , 13D View Figure 13 ). On coxae, 1-2 psp on coxae I, 2-3 psp on coxae II and 1-2 psp on coxae III, located close to longitudinal rows of chaetae. On manubrium, 2+2 dorso-apical ones (Fig. 12H View Figure 12 ).
Clypeus and mouthparts (Figs 11A-C, F View Figure 11 , 12A View Figure 12 ). Clypeal area with three long, smooth prefrontal chaetae; 9 middle chaetae (two long smooth chaetae, 7 small ciliated chaetae from mic to mes arranged asymmetrically), and two long, smooth lateral chaetae (Fig. 11A View Figure 11 ). Prelabral and labral chaetae 4/5, 5, 4, all thin and smooth; three median chaetae of the first and second rows longer than the two lateral ones (32-38 vs. 12-15 µm) (Fig. 11C View Figure 11 ). Distal border of the apical non-granulated area of the labrum with a relatively narrow median U- or V-form intrusion into the granulated area dorsally; apical edge without spines (Fig. 11C View Figure 11 ). Ventro-distal complex of labrum well differentiated, asymmetrical, with 1+1 distal combs 15-16 minute on the right side and 13 strong and larger teeth on the left side, and an axial pair of long sinuous tubules. Maxillary outer lobe with one basal chaeta, one apical chaeta (basal chaeta thicker than apical one) and four smooth sublobal hairs (65-70 vs. 25-32 µm) (Fig. 11F View Figure 11 ). Labial palp strongly modified for the genus, with 0, 5, 0, 4, 4 guards for papillae A-E. Lateral process of labial palp subcylindrical, as thick as normal chaetae, with tip beyond the apex of the labial papilla (Fig. 11B View Figure 11 ). Mandible apex blunt and strong, asymmetrical (left with four teeth, right with five teeth); molar plate with three strong pointed basal teeth, and 3-(5) smaller inner distal teeth, identical in both mandibles (Fig. 12A View Figure 12 ). Maxilla capitulum with a three-toothed claw and several stout ciliated lamellae; lamella 2 large and broad, lamella 3 well developed; several other lamellae present.
Antennae. Antennae long, approximately 3.1-4.2 times as long as cephalic diagonal. Antennal segments ratio as I: II: III: IV. 1: 0.5-0.73: 0.48-0.7: 0.41-0.68 (N = 6). Antennal segments not subdivided nor annulated. Antennal chaetal types not analyzed in detail. Ant. I ventrally with many smooth spiny mic of various sizes in its basal part, many subcylindrical, hyaline sens in its middle to apical part, and many long smooth straight chaetae. The paddle-like chaetae on Ant II absent. Ant. III organ with five sens not clearly seen in all specimens. Ant. IV without apical bulb. Subapical organite not distinctly knobbed, swollen, slightly enlarged apically, inserted dorsally.
Dorsal head chaetotaxy (Fig. 11E View Figure 11 ). Dorsal cephalic chaetotaxy with five antennal chaetae (An1-3, An3a2, An3a, An1 as mes), four anterior mac (A0, A2-3 and A5) three median (M1, M2 and M4) and eight sutural mac (S0, S1-S7); Gr. II with 4 or 5 mac; A0 as mac; 5-7+5-7 scale-like structures present below sutural mac, probably inside the integument; a pair of short cephalic trichobothria, external and close to the middle of the head (Fig. 11E View Figure 11 ).
Ventral head chaetotaxy (Fig. 11D View Figure 11 ). Chaetae of labial basis all smooth (m1m2rel1l2), (mimrel1l2 sensu Zhang and Pan, 2020), chaetae m1(mi), e and l1 subequal, r thin and shortest, and l2 longest, m2 longer and thicker than m1. The ratio of r to m2: 0.13-0.19 (Fig. 11D View Figure 11 ). Postlabial chaetae X2, X and X4 minute chaetae, X1 and X3 absent. On each side of cephalic groove with 8-11 chaetae, of which the anterior five always long and smooth, others either smooth or finely ciliated, at least 3-4 minute chaetae always present on the posterior ones (Fig. 11D View Figure 11 ).
Tergite chaetotaxy (Figs 13A-D View Figure 13 ). Th. II with three (m1, m2, m2i) medio-medial, three (m4, m4p, m4i) medio-sublateral and 31-33 posterior mac; 1+1 ms and 2+2 sens antero-laterally (Fig. 13A View Figure 13 ).
Th. III with 32-33 mac. 2+2 sens laterally (Fig. 13A View Figure 13 ).
Abd. I with seven (a2-3, m4, m2-3, m2i, m4p) mac, 1+1 ms and 1+1 sens laterally (Fig. 13B View Figure 13 ).
Abd. II with 3(4) (a2, m3, m3ep, and m3e sometimes present) central and one (m5) lateral mac. 2+2 tric without modified chaetae, 1+1 sens laterally and 1+1 mic near internal tric (Fig. 13B View Figure 13 ).
Abd. III with two (a2, m3) central and three (am6, pm6, p6) lateral mac, 3+3 tric without modified chaetae, 1+1 sens laterally,1+1 mic near m3, ms present (Fig. 13B View Figure 13 ).
Abd. IV with nine central mac (I, M, A4-6, A5p, B4-6) and nine (D3, E1-4, E2p, F1-3) lateral mac, 2+2 tric and about 8 long S-like chaetae, without modified chaetae (Fig. 13D View Figure 13 ).
Abd. V with 12 obvious mac mixed with several mes to small mac, and 3+3 sens (Fig. 13C View Figure 13 ). Abd. VI not analysed.
S-chaetae formula from Th. II to Abd. V: 2+ms, 2/1+ms,2,2+ms, ≈8, 3; as and ps sens on Abd. IV 1/3 as long as S-like chaetae (Figs 13A-D View Figure 13 ).
Legs (Figs 12B, D View Figure 12 ). Leg long; tita of leg III slightly longer than tita of legs I and II. Legs devoid of scales, covered with ordinary ciliated chaetae of various lengths, mic not seen. Trochanteral organ with 19 smooth, straight, unequal spine-like chaetae (Fig. 12D View Figure 12 ). The distal whorl of tita III with 10 subequal ciliated mes, irregularly arranged, and dorso-apical pointed tenent hair. A smooth, thin and long chaeta close to tenent hair absent. Ventro-distal smooth chaeta of tita III thick, erected, pointed, rather short. Claw slender and elongated. Unguis of all claws without inner tooth, and a pair of subequal basal teeth at about 29-36 % of inner edge from basis. Unguiculus approximately 1/2 as long as the inner edge of the claw, rather swollen basally, pointed apically, devoid of inner tooth, with at least 3-4 minute outer teeth, often inconspicuous, at 3/4 of its length (Fig. 12B View Figure 12 )
Ventral tube (Figs 12E, F View Figure 12 ). Ventral tube about four times longer than wide. Lateral flaps with 6-8+6-8 smooth chaetae (Fig. 12F View Figure 12 ). Anterior face with 6-7+6-7 ciliated chaetae, four of them larger than others (Fig. 12E View Figure 12 ); posterior face with 4 long, smooth apical chaetae and about 11 smooth chaetae arranged roughly asymmetrically, mixed with mic or small acuminate mes (Fig. 12F View Figure 12 ).
Furcal complex (Figs 12C, G, H View Figure 12 ). Tenaculum with four large teeth of decreasing size from the basal to the distal one of each ramus, on a prominent, irregular body, with a postero-basal strong serrated chaeta bent distally. Mucrodens 1.11-2.27 times longer than manubrium. Furcula without smooth chaetae. Manubrium with a dense cover of ciliated chaetae both dorsally and ventrally. Manubrial plaque with 2+2 psp and five to six ciliate chaetae (Fig. 12H View Figure 12 ). Distal part of manubrium ventrally with 13-15+13-15 ciliate chaetae (Fig. 12C View Figure 12 ). Dens without spines, annulated and covered with ciliated chaetae on both sides. Distal smooth part of dens slightly longer than mucro. Mucro strong and falcate, basal spine long, nearly reaching the tip of the mucronal tooth (Fig. 12G View Figure 12 ).
Genital plate. Female genital plate with 2+2 genital mic.
Ecology.
Coecobrya phitsanulokensis sp. nov. was found from the twilight zone (ca. 20 m from the cave entrance) to the dark zone of the cave on wet and muddy ground and on the decaying organic material inside the cave. The length of the main passage in the cave is about 300 m. The temperature was 26.2-27.9 °C, the soil temperature was 24.1-24.3 °C and the relative humidity in the cave was 78-89 %. The cave has a seasonal stream in it, but there was no water during our visit. This cave is developed in a very small isolated limestone hill (0.4 × 0.9 km) surrounded by a flood plain agricultural landscape, with at least seven other caves having been reported in this hill.
Etymology.
This species is named after the type locality, Phitsanulok province, where the material was collected.
Remarks.
Among the troglobitic Coecobrya species C. phitsanulokensis sp. nov. is similar to C. ellisi sp. nov. from Tham Tho, Nong Phai district, Phetchabun province. For the species diagnosis see the remarks under Coecobrya ellisi sp. nov. and Table 1 View Table 1 .
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.