Two new species of Ceratophysella (Collembola: Hypogastruridae) from Brazil with a key to South American species of the genus

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Two new species of the denticulata-group in the genus Ceratophysella Börner, 1932, C. rogerarlei sp.n. and C. nataliae sp.n., both from Brazil are described and illustrated. Ceratophysella rogerarlei sp.n. is similar to C. engadinensis (Gisin, 1949) in overall chaetotaxy, but it is unique by the combination of Ant. IV with trilobed apical bulb and 5 dorsal sensilla, PAO atypical with antero-lateral lobe clearly shorter than the antero-medial lobe, and the reduction of trunk dorsal chaetotaxy and number of macrosetae. Ceratophysella nataliae sp.n. is similar to C. gibbosa (Bagnall, 1940) and C. tupamara Palacios-Vargas & Bocanegra, 2012 but differs in dorsal abdominal chaetotaxy, Ant. IV with trilobed apical bulb (simple in C. gibbosa) and dorsal manubrium with 18+18 setae (8+8 in C. tupamara). A key to South American species of the genus is provided. With the descriptions presented, there are now nine species of Ceratophysella recorded from South America and six from Brazil.

Two new species of Ceratophysella (Collembola: Hypogastruridae) from Brazil with a key to South American species of the genus

in Insect Systematics & Evolution

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References

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Figures

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    Habitus of Ceratophysella rogerarlei sp.n. (specimen fixed on ethanol, lateral view). Scale bar: 0.5 mm.

  • View in gallery

    Ceratophysella rogerarlei sp.n. general morphology: 2, dorsal chaetotaxy of head, including eyepatches and PAO; 3, dorsal chaetotaxy of Abd. V–VI and anal spines. Scale bar: 40 μm (2), 20 μm (3).

  • View in gallery

    Ceratophysella rogerarlei sp.n. head: 4, dorso-lateral view of Ant. III–IV (left antenna); 5, ventral view of Ant. III–IV (left antenna); 6, labial and post-labial chaetotaxy (right side), arrow indicate seta occasionally absent; 7, maxillary outer lobe and sublobal plate in detail (right side).

  • View in gallery

    Ceratophysella rogerarlei sp.n. dorsal chaetotaxy of head and thorax (left side), PAO polymorphy and serrated setae on detail. ‘M’ to macrosetae, ‘S’ to long sensorial setae (in black).

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    Ceratophysella rogerarlei sp.n. dorsal chaetotaxy of abdomen (left side), serrated setae on detail, black arrows point to setae present or absent. ‘M’ to macrosetae, ‘S’ to long sensorial setae (in black).

  • View in gallery

    Ceratophysella rogerarlei sp.n. appendages: 10, subcoxa 2, coxa and trochanter of leg. III (posterior side), black arrow points to distal-posterior cuticular projection; 11, tibiotarsus I (posterior side) labeled chaetotaxy; 12, tibiotarsus III (posterior side) labeled chaetotaxy; 13, femur, tibiotarsus and empodial complex of leg. III; 14, tenaculum; 15, furcula (dorsal view).

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    Ceratophysella rogerarlei sp.n.: 16, genital plate of female; 17, genital plate of male; 18, paired anal valves.

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    Habitus of Ceratophysella nataliae sp.n. (specimen fixed on ethanol, lateral view). Scale bar: 0.2 mm.

  • View in gallery

    Ceratophysella nataliae sp.n. general morphology: 20, dorsal chaetotaxy of eyepatch and PAO, arrow points to accessory tubercle (left side); 21, tenaculum; 22, latero-dorsal chaetotaxy of Abd. IV (left side); 23, dorsal chaetotaxy of Abd. V and VI and anal spines; 24, dorsal dens and mucro (right side). Scale bar: 20 μm (20–22), 50 μm (23), 10 μm (24).

  • View in gallery

    Ceratophysella nataliae sp.n. head: 25, internal view of Ant. III–IV (left antenna); 26, ventro-external view of Ant. III–IV (left antenna); 27, ventral cephalic chaetotaxy including basomedian and basolateral fields of labial region (right side); 28, labial papillae and proximal setae; 29, maxillary outer lobe, sublobal plate and lateral setae in detail (right side); 30, dorsal head chaetotaxy.

  • View in gallery

    Ceratophysella nataliae sp.n. dorsal chaetotaxy of trunk, black arrows point to setae present or absent. Long sensorial setae in black.

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    Ceratophysella nataliae sp.n. legs: 32, subcoxa 1–2 and coxa of leg. III (posterior side), black arrow points to distal-posterior cuticular projection; 33, tibiotarsus II (posterior side) labeled chaetotaxy; 34, tibiotarsus III (posterior side) labeled chaetotaxy; 35, tibiotarsus and empodial complex of leg. III (posterior side).

  • View in gallery

    Ceratophysella nataliae sp.n.: 36, furcula (dorsal view); 37, mucro (right side); 38, genital plate of female; 39, genital plate of male; 40, paired anal valves.

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