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Kerkiratrobius rosanae n. sp. (Figs 1; 2) TYPE MATERIAL. — Greece. Corfu, Kepkypa, Zona tra Pyrghi e Spartilla, 23.IV.1957, Valle Bianchi leg. (no. 83), 1 ơ holotype, 8 mm (Museum of Natural Sciences of Bergamo). — Corfu Gravolymni, 25.IV.1957, Valle Bianchi leg. (no. 84), 1 paratype, ơ 7 mm (Museum of Natural Sciences of Bergamo). ETYMOLOGY. — The species is named after Dr Rosana Pisoni who sent us the material for study. DESCRIPTION Measurements of holotype: body length: 8 mm; antennae length (broken): 6.5 mm; cerci length: 2.5 mm. Scale pattern unknown. Body covered with scales; appendages and flagellum of antennae without scales (but these ones present on scapus and pedicellus); hypodermal pigment faintly visible on head. Head (Fig. 1A, B) with pigment around unpaired ocellus and on lateral part of clypeus and labrum. Compound eyes dark, slightly wider than long, contact line/length 0.47; length/width 0.93; lateral ocelli sole-shaped, dark and narrower in the middle; frons somewhat protruding. Antennae slightly shorter than body, uniform in colour, distal chains of 8 or 9 units with 1 or 2 rings of setae, sensilla in rosette and sensory cones (Fig. 1C). Molar part of mandible well developed; incisive part without distinct teeth, smooth. Maxillary palp slightly elongate, generally unmodified (Fig. 1D). Distribution of dorsal hyaline spines on last three articles as follows: 5 = 3; 6 = 10; 7 = 12. Last article conical and almost as long as penultimate: n/n-1 = 0.99. Third article of labial palp widened, subtriangular (Fig. 1E), with relatively long sensory cones, with a few small setae laterally, on its distal part (Fig. 1F). Legs with coxal stylets on second and third pairs (Fig. 1H). First pair stouter than the followings (Fig. 1G, H). Tibiae and tarsi of all legs with hyaline setae. Length of tibiae (in mm): P I = 0.48; P II = 0.50; P III = 0.56. Urosternites acute to right angled; coxites without hyaline spines but with scattered setae; I to VII with a pair of coxal vesicles; II to IX with stylets which end with a spine longer than setae that cover stylets (Fig. 1 I-K). Length of stylet (without spine)/ length of coxite: V = 0.43; VIII = 0.92; IX = 0.63 in paratype (in the holotype the stylets of IX are lacking). Ratio of spine of stylet to stylet without spine: V = 0.58; VI = 0.47; IX = 0.14 (in paratype). Genitalia surpassing length of coxite IX (Fig. 1K). Paramera present only on coxite IX, without divisions, joined each other in their proximal parts (Figs 1K; 2A); their distal parts curved medially, embracing the penis (Figs 1K; 2A, B). The ⅔ distal parts of paramera are covered with thin setae (Fig. 2A). Penis not surpassing paramera (Figs 1K; 2B). The phallobasis short and the aedeagus long: proximal part/distal one = 0.30. The aedeagus widening in its distal part; its proximal part covered with two rows of minute spines (Fig. 2C); its distal part with numerous short setae; aperture apical (Fig. 2B). Terminal filament (broken), without hair-like scales and spines. Cerci with numerous strong hyaline spines on internal part, with a strong terminal spine (Fig. 2D). A key of the genera of Petrobiinae is given in order to differentiate Kerkiratrobius n. gen. from the remaining genera and subgenera of the subfamily. We consider that the new genus enters in the identification keys of genera of Machilidae proposed by Mendes (1990), after point 4. After 1990, a few genera and subgenera (Leptomachilis Sturm, 1991, Neomachilis (Nesochilis) Sturm, 1993 and Petridiobius (Pacltiobius) Kaplin, 1995) were described and included in the simplified keys presented by Kaplin (1995). We propose the following key to an easier identification of the genera and subgenera of the subfamily known at present, the newly described one included. |
