Coecobrya chumphonensis Zhang & Nilsai
Nilsai, Areeruk, Jantarit, Sopark, Satasook, Chutamas & Zhang, Feng, 2017, Three new species of Coecobrya (Collembola: Entomobryidae) from caves in the Thai Peninsula, Zootaxa 4286 (2), pp. 187-202 : 188-194
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|Coecobrya chumphonensis Zhang & Nilsai|
Types. Holotype: female on slide, Thailand: Chumphon Province: Mueang District: Chang Puak cave, 10.446402°N, 99.035030°E, altitude 70 m., 6.iv.2016, S. Jantarit leg. (collection #THA_SJ_CPN08) GoogleMaps . Paratypes: three females on slides and three in alcohol, same data as holotype. One paratype on slide and one in alcohol deposited in NJAU and others in PSU-NHM. GoogleMaps
Description. Body length up to 2.82 mm. Body whitish in alcohol ( Fig. 2 View FIGURES 2 – 5 ).
Antennae 3.70–4.48 times as long as cephalic diagonal. Antennal segment ratio as I: II: III: IV = 1: 1.55–1.78: 1.75–1.83: 3.00–3.11. Smooth spiny mic at base of antennae: three dorsal, two ventral on Ant. I, one internal, one external and two ventral on Ant. II. Long smooth straight chaetae absent on antennae. Distal Ant. II with 2–4 paddle-like chaetae ( Fig. 6 View FIGURES 6 – 15 ). Two internal S-chaetae of Ant. III organ paddle-like ( Fig. 7 View FIGURES 6 – 15 ). Subapical organ on Ant. IV not distinctly knobbed ( Fig. 8 View FIGURES 6 – 15 ).
Eyes absent. Prelabral and labral chaetae 4/5, 5, 4, all smooth; three median chaetae of the first and the second rows longer than lateral ones. Clypeus with three prefrontal and eight facial chaetae; six facial chaetae minute; lateral chaetae often weakly ciliate ( Fig. 9 View FIGURES 6 – 15 ). Dorsal cephalic chaetotaxy with two antennal (An), four median (M) and eight sutural (S) mac; Gr. II with 6(7) mac ( Fig. 10 View FIGURES 6 – 15 ). Mandibles with 4+5 (4 left, 5 right) large apical teeth. Three smooth sublobal hairs on maxillary outer lobe ( Fig. 11 View FIGURES 6 – 15 ). Lateral process of labial palp thicker than normal chaetae, with tip slightly beyond apex of labial papilla ( Fig. 12 View FIGURES 6 – 15 ). Labial chaetae as mRel1l2, all smooth except R, ratio of R to m 0.44–0.55; chaetae X, X2 and X4 smooth and minute; chaeta X2 absent in one side of one specimen. Chaetae along cephalic groove 9–11; anterior three and the fifth smooth; small chaetae on posterior part often weakly ciliate ( Fig. 13 View FIGURES 6 – 15 ).
Trochanteral organ with 12–22 smooth spine-like chaetae; 7–10 in arms and 5–12 between them ( Fig. 14 View FIGURES 6 – 15 ). Partial inner differentiated tibiotarsal chaetae finely ciliate with ciliations not closely appressed to axis. Tibiotarsi distally with 10 chaetae in a whorl. Unguis with three inner teeth; two paired teeth unequal, outer one slightly larger. Unguiculus swollen with outer edge serrate. Tenent hairs usually pointed and II–III clavate in one specimen ( Fig. 15 View FIGURES 6 – 15 ). Abd. IV 4.25–4.40 times as long as Abd. III along dorsal midline. Ventral tube anteriorly with 9–12 ciliate chaetae on each side and 2(3) of them much larger ( Fig. 16 View FIGURES 16 – 21 ); posteriorly with four apical and about nine proximal chaetae ( Fig. 17 View FIGURES 16 – 21 ), lateral two chaetae of apical ones ciliate in one specimen ( Fig. 18 View FIGURES 16 – 21 ), proximal chaetae often weakly ciliate; each lateral flap with 7(10), 3–4 of them smooth ( Figs 16–17 View FIGURES 16 – 21 ). Furcula without smooth chaetae. Distal part of manubrium ventrally with 11–15 ciliate chaetae on each side ( Fig. 19 View FIGURES 16 – 21 ). Manubrial plaque with two pseudopores and 4–7 ciliate chaetae ( Fig. 20 View FIGURES 16 – 21 ). Distal smooth part of dens 0.89–1.13 times as long as mucro. Mucro falcate with a long basal spine, nearly reaching the tip of the apical tooth ( Fig. 21 View FIGURES 16 – 21 ).
Th. II with 4–6 medio-medial, three (m4, m 4i, m4p) medio-sublateral and 25–32 posterior mac; ms inner to sens. Th. III with 32–35 mac; p3ip2 present in one side of one specimen ( Fig. 22 View FIGURES 22 – 24 , Table 2). Abd. I with 6–7 (a2–3, m2–4, m 2i, m4p) mac; a2 often as mic. Abd. II with three (m3, m3e, m3ep) central and one (m5) lateral mac. Abd.
III with two (a2, m3) central and three (am6, pm6, p6) lateral mac; Abd. IV with seven central (I, M, B4–6, A5–6) and 10–12 lateral mac; F1p and F3p sometimes absent ( Fig. 23 View FIGURES 22 – 24 ). S-chaetae formula: 2+ms, 2/1+ms, 2, 2, ±20, 3; sens usually outer to ms but inner to ms on Abd. I in one specimen; lateral sens (acc.p6) of Abd. II–III as long as 0.6 times central as; as and ps on Abd. IV 1 /4 length of others. Sens acc.p5 anterior to m5 ( Figs 22–24 View FIGURES 22 – 24 ).
GenBank number. KY704919–KY704920.
Ecology. A small population of the species was collected in the dark, deep zone of the cave, ca 30 meters from cave entrance in a wet and humid habitat near a pool, stalagmites, rock surfaces and floor.
Etymology. Name after the province “ Chumphon ” where this species was discovered.
Remarks. Coecobrya chumphonensis sp. nov. can be separated from other Coecobrya species by the combination of large size, long antennae, two antennal mac and 6(7) Gr. II mac on dorsal head, ciliate labial chaeta R, serrate outer edge on unguiculus, 4–6 medio-medial mac on Th. II, two central mac on Abd. III, 10–12 lateral mac on Abd. IV, and short, lateral sens acc.p6 on Abd. II–III. The position of lateral sens acc.p5 on Abd. V is also unique in the genus. The three new species described in this study and Coecobrya annulata Zhang, Bedos & Deharveng, 2016 are very similar in elongate antennae, labrum, minute postlabial chaetae X2 and X4, abundant chaetae on ventral chaetae, and relatively abundant mac on thorax, Abd. I and IV. They can be distinguished by the combination of characters listed in Table 3. It differs from other three species in two antennal, four median and 6(7) Gr. II mac on dorsal head, ciliate labial chaeta R, and 2+2 central mac on Abd. III.
TABLE]. K2P genetic đistances between 14 inđiviđuals. Abbreviations for population localities: CP, Chang Puak cave; PBS /STN, Phraya Bangsa cave; TD, Ton Din cave.
Coecobrya chumphonensis sp. nov. CP̲sp5̲1
CP̲sp5̲2 0.0 0 0
Coecobrya polychaeta sp. nov. PBS ̲sp1̲1 0.277 0.277
PBS̲sp1̲2 0.280 0.280 0.002
PBS̲sp1̲3 0.277 0.277 0.005 0.006
COLLH 6547-16̲STN 0.262 0.262 0.049 0.051 0.049
COLLH 6548-16̲STN 0.262 0.262 0.049 0.051 0.049 0.000 COLLH 6549-16̲STN 0.262 0.262 0.049 0.051 0.049 0.000 0.000
Coecobrya cf. polychaeta sp. nov. TD̲cf̲sp1̲1 0.271 0.271 0.221 0.223 0.219 0.239 0.239 0.239 TD̲cf̲sp1̲2 0.271 0.271 0.221 0.223 0.219 0.239 0.239 0.239 0.000 TD̲cf̲sp1̲3 0.271 0.271 0.221 0.223 0.219 0.239 0.239 0.239 0.000 0.000 COLLH 6520-16̲TD 0.273 0.273 0.223 0.225 0.221 0.239 0.239 0.239 0.000 0.000 0.000 COLLH 6521-16̲TD 0.273 0.273 0.223 0.225 0.221 0.239 0.239 0.239 0.000 0.000 0.000 0.000 COLLH 6522-16̲TD 0.273 0.273 0.223 0.225 0.221 0.239 0.239 0.239 0.000 0.000 0.000 0.000 0.000
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