Sinella agna Christiansen & Bellinger, 1980

Wu, Jun, Yan, Qibao & Zhang, Feng, 2016, Supplementary descriptive notes of the Sinella and Coecobrya (Collembola: Entomobryidae) species from North America, Hawaii and Japan, Zootaxa 4085 (4) : -

Sinella agna Christiansen & Bellinger, 1980

Figs 1, 2 , 5–9

Sinella (Sinella) agna Christiansen & Bellinger, 1980

Type locality. Mill Run Cave , Tucker, West Virginia, USA.

Material examined. One slide per locality, USA: Kentucky: Rockcastle : Crooked Creek Cave, xii.1972 (# 3125) ; USA: California: Shasta: Samwell Cave , 2.xi.1989 (# 7196) ; USA: West Virginia: Pocahontas: Dreen Cave , 10.xi.1990 (# 7197) ; USA: West Virginia: Pocahontas: My Cave , 10.xi.1990 (# 7198). Deposited in CARC.

Additions to original description. Inner tibiotarsal chaetae coarsely ciliate ( Figs 1, 2 ). Dorsal cephalic chaetotaxy with 4 antennal (An), 4 median (M), 5 sutural (S) and 4 in Gr. II ( Fig. 5 ). Th.II with 4 (m1, m2, m 2i, m2e) medio-medial, 3 (m4, m 4i, m4p) medio-lateral, and 19 posterior mac ( Fig. 6 ). Th. III with 30–34 mac and 4 (m5, m 5i, a6, a 6i) in Gr. III; m1 and m4 sometimes as mac; a7, m7, m 7i 2 and m6, ai2 as mac ( Fig. 7 ). Abd.II with 6 (a2, a3, m3, m3e, m 3ei, m3ep) central and 1 (m5) lateral mac. Abd.III with 4 (a2, a3, m3, m3e) central and 3 (am6, pm6, p6) lateral mac ( Fig. 8 ). Abd.IV with 9–15 central and 13–17 lateral mac ( Fig. 9 ).

Ecology. Known only from caves.

Distribution. West Virginia, Kentucky, California.

Remarks. It is similar to another American cave species Sinella basidens Bonet, 1934 in long apical tooth and short basal spine on mucro, labial chaetae m 1m 2rel1l2, absence of inner unpaired tooth on unguis, smooth unguiculus outer edge, coarsely ciliate differentiated chaetae on tibiotarsi, but differs from the latter in long antennae and lateral process of labial palp exceeding apex of labial papilla.

Figures

FIGURES 1 – 4. SEM photos of inner tibiotarsal differentiated chaetae: 1 – 2, S. agna; 3 – 4, S. alata.

FIGURES 5 – 9. Dorsal chaetotaxy in S. agna: 5, head; 6, Th. II; 7, Th. III; 8, Abd. II – III; 9, Abd. IV.