Lathriopyga nistru, Buşmachiu, Galina, Deharveng, Louis & Weiner, Wanda Maria, 2010

Buşmachiu, Galina, Deharveng, Louis & Weiner, Wanda Maria, 2010, A new species of the genus Lathriopyga Caroli, 1912 (Collembola, Neanuridae, Neanurinae) from the Republic of Moldova, Zootaxa 2639, pp. 53-58 : 54-56

Lathriopyga nistru sp. nov.

Figs 1–8 , Table 1

Type material. Republic of Moldova: holotype female (MDA–07–1), 25.iii.2007, village Orheiul Vechi (N 47°18´, E 28°57´), riverside of Răut, tributary of Dniester River, calcareous litter, under low shrubs; paratypes male (MDA–07–2), female (MDA–07–7), 25.iii.2007, female (MDA–04–06), 22.iv.2008, the same locality as holotype; juvenile male (MDA–04–4), 25.vii.2004, village Tipova (N 47°37´, E 28°57´), riverside of Dniester, calcareous litter, under low shrubs; subadult female (MDA–05–8), 1.v.2005 village Sipoteni (N 47°20´, E 28°04´), wild apple orchard near the forest, litter with soil; juvenile male (MDA–06–5), 2.v.2006, village Rascova, riverside of Dniester calcareous litter, under low shrubs; 2 males (MDA–09–3, 9), 14.v.2009, village Rascaeti (N 46°34´, E 29°45´) steppe, under low shrubs; coll. G. Buşmachiu. Holotype and one paratype in ISEA, four paratypes in IZM and one paratype in MNHN.

Etymology. The species name refers to the Nistru River, local name of the Dniester River.

Description. Body length (without antennae): 0.98–1.43 mm. Habitus typical for Lathriopyga genus. Colour: dark blue-violet to grey-blue. Ocelli pigmented, large and subequal.

Tubercles. All dorsal tubercles well developed, some fused—Cl, Af and both Oc, Di and De, L and So on head; Di and De on Th. I; Di + Di on Abd. IV and V; De, Dl and L on Abd. V tergum; Di, De, Dl and L on Abd.VI ( Fig. 1 ). Tubercle (Cl+Af+2Oc) on head with 4 granular areas. Strong cryptopygy ( Figs 1 and 8 , Tab. 1).

Types of chaetae. (i) Five kinds of ordinary chaetae: thick subcylindrical, feebly scaled, narrowly sheathed, rounded (strongly or slightly) apically, long (Ml), medium (Mc) and short macrochaetae (Mcc) ( Fig. 6 ); thin, acuminate, smooth, long to rather short mesochaetae (me) ventrally on the lateral tubercles and on appendages ( Fig. 7 ); Oca on head and An on anal valves as very short, acuminate microchaetae (mi) ( Fig. 8 ). (ii) Dorsal chaetae (mou) on Ant. IV (”soies à apex mousse”). (iii) Four kinds of s-chaetae: long but shorter than nearest macrochaetae on Th. II–Abd. V tergites (sensory chaetae s) ( Fig. 1 ); thick, rather long, bent sensilla on Ant. IV (S1–S8, Fig. 2 ) and guard sensilla of Ant. III (dorsal Sgd and ventral Sgv, Figs 2 and 3 ); short internal sensilla on Ant. III (S3 and S4); microsensillum on Ant. III (ms) and on Th. II (in Dl) ( Fig. 1 ).

Antennae. Shorter than head (about 3/4 of its length). Antennal segment I with 7 chaetae, antennal segment II with 11 chaetae (one specimen with 12). Antennae III and IV fused dorsally, ventral separation well marked ( Figs 2 and 3 ). Sensory organ of antennal segment III consisting of: two small internal sensilla bent in same direction, two subcylindrical guard sensilla (Sgv longer than Sgd), ventral microsensillum present. Antennal segment IV with mou-chaetae, 8 sensilla, one ordinary chaeta i, subapical organite and trilobed apical vesicle, lacking microsensillum ( Figs 2 and 3 ).

Ocelli 2+2. Buccal cone short and wide. Labrum short with 4/2,4 chaetae, labium with 11 chaetae (without chaetae B, b, e, with one long lateral chaeta between labrum and labium) and with two labial organites ( Fig. 5 ). Maxilla styliform with two subapical teeth and lamella with two small denticles at the apex, mandible strong with two apical fork-like teeth, two large basal teeth and 6–7 denticles as fringes visible between apical and basal teeth ( Fig. 4 ).

Head chaetotaxy ( Tab. 1, Fig. 1 ). Chaetae Oca as microchaetae (present asymmetrically as mesochaeta on one specimen).

Dorsal chaetotaxy as in Fig. 1 and Tab. 1. Sensory chaetae s formula per half tergum 022/11111.

Ventral chaetotaxy as in Fig. 8 and in Tab. 1. Thoracic sterna without chaetae. Ventral tube with 4+4 chaetae. No modified ventral chaetae in the male.

Appendages. Chaetotaxy as in Tab. 1 and Fig. 7 . Claw with very small inner tooth.

Discussion. Lathriopyga nistru sp. nov. is the second species (after L. bulgarica Smolis, Skarżyński & Pomorski, 2004 from neighbourhood of Zvezdets in Strandzha, Bulgaria) of the genus with tubercules Di and De fused on Th. I. Both species are similar in most chaetotaxic characters, but the new species differs from L. bulgarica by the presence of 3+3 chaetae Di on Abd. V, Di 1 as a long macrochaeta and Di 2 and Di 3 as short macrochaetae, the form of mandible (with 6–7 denticles as a fringe between apical and basal teeth), and the presence of microchaetae Oca (absent in the holotype and paratype of L. bulgarica ). The labral formula of the new species is 4/2,4. The most lateral long chaeta of the labium is intermediate between labrum and labium, and could be the most lateral of the proximal row of labrum, which would give a labral formula 4/4,4 as given by Smolis et al. (2004) for L. bulgarica .

Cephalic chaetotaxy

Tubercle Number of chaetae Type of chaetae Chaetae

Cl+Af+2Oc + 20 Ml B, F, Ocm, Ocp

Mc A, G

Mcc or mi C, D, E, Oca

Di + De + 3 Ml Di 1, De 1

Mc De 2 Dl + 3 Mc Dl1,Dl2,

Mcc Dl4

L+So + 10 Ml L1, So1, So6

Mc L2, L4, So2, So5

Mcc or me L3, So3, So4

Vi 6

Ve 9

Labrum 4/2,4

Labium 11, 2x

Ant. I-II 7, 11 (12)

Ant. III 18 + 5s

Ant. IV 8 s+ i+or+12 mou

Figures

FIGURES 1 – 8. Lathriopyga nistru sp. nov.: 1, dorsal chaetotaxy; 2, antenna dorsally; 3, antenna ventrally; 4, mandible and maxilla; 5, labrum and labium, 6, type of dorsal ordinary chaetae from left: Ml, Mc and Mcc; 7, tibiotarsus III; 8, Abd. III – VI ventrally.