Lobellina pomorskii, Smolis, Adrian, 2017

Smolis, Adrian, 2017, Contribution to the knowledge of Neanurinae of Vietnam with description of three new species (Collembola, Neanuridae), ZooKeys 688, pp. 15-33 : 15

Lobellina pomorskii sp. n. Figs 9-15; Table 2

Type material.

Holotype: female on slide: Vietnam, Do son near Haiphong, communities of grasses on sea rocks, Berlese-Tullgren extraction, 12.IV.1997, leg. R.J.Pomorski (housed in DIBEC). Paratypes: 2 females and 3 juveniles on slides, same data as holotype (DIBEC and MNHN).

Etymology.

The species is named in honour of Prof. Romuald Jacek Pomorski who has contributed so very much to the knowledge of Collembola .

Diagnosis.

Habitus typical of the genus Lobellina . Dorsal tubercles present and well developed. 3+3 large eyes. Color of body alive red. Mandible with six teeth. Head with chaetae A, B, C, D and E, chaeta O absent. Tubercle Oc with two chaetae on head. Tubercles Di on Th. II and III with 2 chaetae. Abd. V with 2+2 tubercles. Abd. V with 2+2 chaetae Di. Claw with inner tooth. Tibiotarsi with chaetae B4 and B5 short and pointed.

Description.

General (Figs 9, 14). Body length (without antennae): 0.55 (juvenile) to 1.70 mm (holotype: 0.95 mm). Habitus elongate, parallel and slightly dorsoventrally flattened. Cuticular granulations fine, tubercles well developed on dorsal side of body, with subcuticular reticulations. Color red alive and white in alcohol. 3+3 large black eyes, anterior ocelli not on tubercle Oc.

Chaetal morphology (Figs 9, 14). Dorsal ordinary chaetae of four types: Ml, Mc, me, and mi. Macrochaetae Ml long, moderately thickened, straight, narrowly sheathed, smooth and rounded apically. Macrochaetae Mc morphologically similar to long macrochaetae, but shorter. Mesochaetae similar to ventral chaetae, thin, smooth and pointed. Microchaetae similar to mesochaetae, but apparently short. S-chaetae of tergites thin, smooth and distinctly shorter than nearby Ml.

Antennae (Figs 10, 11; Tab. 2b). Typical of the genus. S-chaetae of Ant. IV of medium length and moderately thickened. Apical vesicle trilobed. Sensillum sgd not migrated distally (Fig. 10).

Mouthparts (Figs 12, 13, 15). Buccal cone relatively short and wide with labral sclerifications non-ogival, labral formula: 0/2,2. Labium as in Fig. 15, papillae x present and relatively large. Maxilla styliform (Fig. 13), mandible with 6 teeth, 4 apical and 2 basal (Fig. 12).

Dorsal chaetotaxy and tubercles (Figs 9, 14; Tab. 2a, c). Chaetotaxy and arrangement of tubercles of head as in Fig. 9 and Tab. 2a. Chaeta O absent. Chaetotaxy of Th. and Abd. as in Figs 9, 14 and Tab. 2c. Abd.V with 2+2 tubercles, s–chaeta integrated with tubercle Dl. On Abd. V, chaetae Di3 absent.

Ventral chaetotaxy (Tab. 2c). On head, groups Vea, Vem and Vep with 4, 3, 4 chaetae respectively. Group Vi on head with 6 chaetae. On Abd.IV, furca rudimentary without microchaetae. On Abd.V, chaeta Vl present. Male without modified chaetae.

Legs (Tab. 2c). Claw with internal tooth. On tibiotarsi, chaeta M present and chaetae B4 and B5 short and pointed.

Remarks.

Lobellina pomorskii sp. n. strongly resembles another Vietnamese species of the genus, L. perfusionides (Stach, 1965). However, these species can be distinguished by the following features: shape of dorsal long macrochaetae (in pomorskii cylindrical, in perfusionides flattened and extended apically), number of chaetae in tubercles An on head (in pomorskii 8, in perfusionides 6), number of chaetae De on Th. I (in pomorskii 2, in perfusionides 1), number of ordinary chaetae De on Th. III (in pomorskii 3, in perfusionides 2), number of ordinary chaetae De on Abd.IV (in pomorskii 2, in perfusionides 1) and number of tubercles on Abd. V (in pomorskii 2+2, s–chaetae integrated with tubercles Dl; in perfusionides 3+3, s–chaetae not integrated with tubercles Dl). Furthermore, the new species was found in communities of grasses on sea rocks (Northeastern Vietnam) while type material of L. perfusionides was collected from "moss growing on a tree" (mountain region of Northern Vietnam, Stach 1965).