Pseudosinella huetheri Stomp, 1971

Winkler, Daniel, Nemeth, Marton Tamas & Fiera, Cristina, 2021, A new species of Pseudosinella Schaeffer, 1897 (Collembola, Entomobryidae) from Hungary and Romania, with redescription of the related species Pseudosinella huetheri Stomp, 1971, ZooKeys 1063, pp. 121-137 : 121

Pseudosinella huetheri Stomp, 1971

Figures 6 , 7 , 8 , 9 , 10

Material examined.

Holotype: Luxembourg. sex not visible, on slide, preserved in NHMG (Fig. 6A ), Berdorf , “Zigzagschloeff” rocks, 357 m a.s.l., 49°49'33"N, 6°20'21"E, beech forest (Fagetum), from litter, 11.Aug.1965, leg. N. Stomp.

Diagnosis.

5+5 ocelli. Colour yellowish white. Labial chaetotaxy M1m2Rel1L2, R ~ 0.5 of M. Dorsal macrochaetae formula R0R1R2001/00/0101+2. Abdominal tergite II chaetotaxy: -aBq1q2.Abd IV accessory chaeta s, anteriorly to trichobothrial complex, absent. Antennae and legs without scales. Unguis inner side with two paired basal teeth and one unpaired tooth, unguiculus outer lamella smooth.

Redescription.

Habitus (Fig. 6B ). Body length (without head and furca) 1.2-1.5 mm ( Stomp 1971), holotype length 1.46 mm. Colour (after Stomp 1971): yellowish white, without any trace of pigment, neither on tergites and coxae nor on antennae. A few spots of blue pigment distributed in small dots around eyes. Eye patches blue.

Head. With 5+5 eyes (ABCDH, with H only slightly smaller) (Fig. 7A ; see also fig. 2 in Stomp 1971). Dorsal cephalic main macrochaetae formula R0R1R2P (according to AMS notation A0, A2, A3 and Pa5). Number of macrochaetae “An” on head 10+10 (Fig. 7A ). Antennal length to head diagonal length ratio 1.4 (head diagonal measured from cervical edge to apex of labrum). Relation of antennal segments I-IV as 1: 1.7: 1.5: 3.0. Ant III sensillary organ composed of two rod-like sensilla partially behind a cuticular fold, guarded by three sensilla, one of them shorter, spine-like (Fig. B). Ant IV without apical bulb. Arrangement of chaetae on labrum 4/554; prelabral chaetae smooth, first (p), second (m) and apical (a) rows of labral chaetae also smooth, chaetae of p and m series about the same in size, not enlarged, a1-a2 thicker but not enlarged; labral edge with no differentiated papillae (as in Fig. 2D ). Outer maxillary palp with two smooth chaetae and three smooth main sublobal hairs. Lateral process (sensu Fjellberg 1999) on papilla E finger-shaped, barely reaching the top of papilla (see Fig. 2E ). Labial anterior row formed by 5 smooth chaetae (a1-a5); formula of basal row M1m2Rel1L2 with M1, R and L2 ciliated and all other chaetae smooth (Fig. 7C ). Chaeta R reduced (ratio of R/m2 0.5). Ventral postlabial chaetotaxy with about 18 ciliate chaetae, postlabial formula 4 (G1-4), 2 (X, X4), 4 (H1-4), and 2 (J1-2) chaetae; b.c. present (Fig. 7C ).

Body. Body dorsal macrochaetae from Th II to Abd IV 00/0101+2. Mesothorax without Mac. Two anterolateral S-chaetae (al and ms) present. Th III without Mac, anterolateral sensillum al present. Abd I with lateral S-microchaeta (ms). Chaetotaxy of Abd II-III as in Fig. 8A, B . Abd II chaetotaxy between two dorso-medial trichobothria -aBq1q2 using Gisin’s symbols ( Gisin 1967); following Szeptycki’s (1979) notation a=a2, B=m3, q1=m3e and q2=p4. Chaeta a as ciliated mic. Abd IV chaetotaxy as in Fig. 9A . Mac B5, B6, C1, D3, E2, E3, F1, F2 and F3 broader with broad sockets, D2, De3, E4, E4p, E4p2, F3p, Fe4, Fe5, T6 and T7 thinner with smaller sockets. Chaeta E1 not visible, its morphology unknown. Abd IV chaetae associated with the two trichobotria (m, pe and pi) fan-shaped (chaeta a not visible, but with great certainty also fan-shaped) (see also Hüther 1969). Accessory chaeta s, associated with trichobotrium T2, absent. Five S-chaetae (as, ps, and three long dorsal S-chaetae) present. Dorsal chaetotaxy of Abd V as in Fig. 9B . Three S-chaetae (as, acc.p4 and acc.p5) typical for the genus present. Legs without scales. Trochanteral organ with 14 smooth spiny chaetae forming a V-shaped pattern (Fig. 10A ). Unguis and unguiculus as in fig. 3 in Stomp (1971). Unguis with subequal paired basal teeth at 45% from inner edge, and with a median unpaired inner tooth at 65% from inner edge, apical tooth absent. A short external tooth also present. Unguiculus lanceolate, external lamella smooth. Tibiotarsal tenent hair spatulate, supraempodial chaeta on tibiotarsus III smooth and acuminate. Ratio of supraempodial chaeta / unguiculus ~0.9. Ventral tube without scales; with 8+8 subequal ciliated chaetae on anterior side and 5+5 subequal ciliated chaetae on posterior side (Fig. 10B ); lateral flap with 4 ciliated and 7 smooth chaetae. Manubrium ventrally with scales and 2+2 terminal ciliated chaetae. Manubrial plate with 2 inner chaetae and 2 chaetae external to the 2 pseudopores (as in Fig. 5D ). Length of not ringed terminal dens about 4 times the length of mucro. Mucro with distal tooth equal to anteapical one; basal spine reaching tip of anteapical tooth (as in Fig. 5E ). Ratio manubrium/dens/mucro as 12:13:1.

Ecology and distribution.

Pseudosinella huetheri was described from Luxembourg, from a beech forest near Berdorf ( Stomp 1971). The original description reported the species also from Germany and Switzerland. Later, the species was found in Austria ( Bretschko and Christian 1989), France ( Ponge 2004) and Slovakia ( Raschmanová et al. 2008). Dányi et al. (2006) collected a species close to P. huetheri in Romania, listed as " Pseudosinella cf. huetheri ", but without any differential character being mentioned.

Figures

Figure 2. Pseudosinella hartnerae sp. nov. A head, dorsal chaetotaxy (left side) B antennae, Ant III with sensillar organ C clypeus, clypeal chaetae D labrum E labial papilla E with lateral process F labial triangle (right side) and ventral cephalic groove with labial and postlabial chaetotaxy. Scale bars: 0.05 mm (A); 0.03 mm (B-D, F); 0.01 mm (E).

Figure 5. Pseudosinella hartnerae sp. nov. A trochanteral organ B leg III unguis and unguiculus C ventral tube anterior view (right side) and posterior view (left side) D manubrial plate E mucro and apical part of dens. Scale bars: 0.02 mm (A, B, D, E); 0.03 mm (C).

Figure 6. Pseudosinella huetheri Stomp, 1971. A Photograph of the slide of the holotype from the NHMG Switzerland) B Habitus, holotype. Scale bar: 0.05 mm (B).

Figure 7. Pseudosinella huetheri Stomp, 1971 A head, dorsal chaetotaxy (left side) B antennae, apex of Ant III with sensillar organ C labial triangle (right side) and ventral cephalic groove with labial and postlabial chaetotaxy. Scale bars: 0.05 mm (A); 0.03 mm (B, C).

Figure 8. Pseudosinella huetheri Stomp, 1971. Abdomen dorsal chaetotaxy: A Abd II (left side) B Abd III (left side).? indicates the estimated position of chaetae that were not observed in the holotype due to the condition of the slide, but their presence is assumed. Scale bar: 0.05 mm (A, B).

Figure 9. Pseudosinella huetheri Stomp, 1971. Abdomen dorsal chaetotaxy: A Abd IV (left side) B Abd V.? indicates the estimated position of chaetae that were not observed in the holotype due to the condition of the slide, but their presence is assumed. Scale bars: 0.05 mm (A, B).

Figure 10. Pseudosinella huetheri Stomp, 1971. A trochanteral organ B ventral tube anterior view (right side) and posterior view (left side). Scale bars: 0.03 mm (A, B).