Deuteraphorura caprelleana, Fanciulli, Pietro Paolo, Loreti, Mara & Dallai, Romano, 2010

Fanciulli, Pietro Paolo, Loreti, Mara & Dallai, Romano, 2010, A new cave species of Deuteraphorura (Collembola: Onychiuridae) and redescription of four species of the genus from Italy, Zootaxa 2609, pp. 34-54 : 35-38

Family Onychiuridae

Deuteraphorura caprelleana sp. nov. Figs 1–13 , Tab. 1 –3

Type locality. Italy, Caprelle cave (41 MA/MC; Coord gauss-boaga 2355275–4777580), 880 m a.s.l. in the karstic plain of Mount Lago of Sefro-Pioraco (Province of Macerata).

Type material. Holotype (female) and 3 paratypes (females), Caprelle cave (41 MA/MC; Coord gaussboaga 2355275–4777580), (June 2007, leg. Loreti M.). All types deposited in Collembola collection, Department of Evolutionary Biology, University of Siena.

Description. Body length 2.4–2.6 mm, cylindrical in shape with uniform cuticle granulation. Colour white in alcohol.

Length of Ant. I, II, III and IV as 57, 105, 120 and 160 µm. Ratio antennae/head diagonal = 0.86. Antennal base well marked. Ant. IV with subapical organite and microsensillum at its base in latero-external position ( Fig. 9 ); some sensilla not well distinguishable from ordinary chaetae. Ant. segments I, II and III with 8, 14 and 18 chaetae respectively ( Fig. 9 ). Antennal III sense organ as in Fig. 10 , consisting of five papillae, two sensory rods, two ribbed sensory clubs, five guard chaetae and microsensillum ( Fig. 10 ).

PAO consisting of 19–21 compound vesicles disposed in two parallel rows ( Fig. 11 ). Labrum as in Fig. 7 with 5,4,2 chaetae, chaetotaxy of the labium (submentum) with 4+4 chaeta ( Fig. 4 ), basolateral field (mentum) with 5 chaetae ( Fig. 4 ); outer maxillary lobe with one basal chaeta and two sublobal hairs ( Fig. 5 ). Labial palp of type AB ( Fjellberg 1999) with six proximal chaetae; labial papillae A, B, C, D and E with 1, 4, 0, 3 and 3 guard chaetae respectively ( Fig. 6 ). Mandible with four apical teeth as in Fig. 12 ; maxillary head as in Fig. 13 . VT with 7–8+7–8 apical chaetae, without basal chaetae.

Body chaetotaxy made of mesochaetae, macrochaetae and lateral microsensilla on thoracic terga II and III. Chaetotaxy type and distribution of dorsal chaetae as in Fig. 1 and Tables 1 –3, sometimes extra chaetae and asymmetries have been observed. Abdominal terga IV and VI with chaeta p0. Ratio chaetae M/s = 2.2 on abdominal tergum V. Thoracic sterna without chaetae along linea ventralis; ventral chaetotaxy of abdomen and head as in Figs 2 and 3 respectively. Furca reduced to finely granulated area with 2+2 chaetae disposed in one row; female genital area with 17–20 chaetae.

Tibiotarsi I, II, and III with 18, 18 and 17 chaetae respectively; distal whorl with 9 chaetae. Claw without inner tooth, small outer tooth present; empodial appendage slender, reaching about 80% of the inner edge, without basal lamella ( Fig. 8 ).

d m0, m1, m2, m3, m4 sd m1, m2, m3, m3’, m4, M5, sd’ m1, m3, m5

v m1, m2, m3, M4 ca m5,

cm m3, m4

cb m1, m3, m5, m6 cp m1, m4, m6

p m2, m3, m4, m5, m 6 g 11 chaeta

m: micro-mesochaetae; M: macrochaetae.

row Thorax I Thorax II Thorax III

a m2, m4, m 6 m 2, m3, m4, m5, m6, M 7 m 2, m3, m4, m5, m6, M 7 m M1, m2, m3, m4, M5, m6?, M 7 m 1, M2, m3, m4, m5, m6, M7, M8 ca m3, m 5 m 4, m5

cp m1, m2, m4, M 6 m 1, m2, m4, m6

p M1, m2, m3, m4, M5, m6, m7, M 8 m 1, m2, M3, m4, M5, m6, m7, M 8 m 1, m2, M3, m4, M5, m6, M7, M8

m: micro-mesochaetae; M: macrochaetae.

Dorsal pseudocellar formula: 32/033/33354. Ventral pseudocellar formula: 3/011/3212. Holotype with 1, 1 and 2 pseudocelli on subcoxae 1 of I, II and III pairs of leg; in the paratypes subcoxa 1 of I, II and II pairs of leg with two pseudocelli each; all femura with one ventral parapseudocellus; not well visible in other parts of the body.

Etymology. The species name is derived from the name of the cave in which it was found.

Discussion. Some Deuteraphorura species: D. ghidinii ( Denis, 1938) , D. pseudoghidinii ( Dallai, 1969) , D. handschini ( Denis, 1924) , D. hussoni ( Denis, 1935) share the same formula of dorsal pseudocelli as the new species. However, all of them differ from the new species for the different ventral formula that is 3/011/ 3212 in D. caprelleana sp. nov. while it is 2/011/ 2212 in D. ghidinii , 2/011/ 3111 in D. handschini , and 2/011/ 2111 in D. hussoni and 3/011/ 2212 in D. pseudoghidinii . On the contrary, there are some species of Deuteraphorura with the same ventral formula as in the new species (3/011/3212) but differ for the dorsal formula. Among these D. cebennaria ( Gisin, 1956) (32/133/33354), D. frasassii Fanciulli, 1999 (32/033/ 33353), D. gemae ( Simon & Luciáñez, 1994) (32/133/33353), D. nevoi (Gruia, Poliakov & Broza, 2000) (32/ 122/33343). Based on the pseudocellar formula, the new species appears very closely related to D. pseudoghidinii and D. frasassii .

TABLE 3. Deuteraphorura caprelleana sp. nov. Chaetotaxy of the abdominal tergites.

row Abdomen I Abdomen II Abdomen III

a m5, m6, m7, M 8 m 5, m6, m 7 m 3, m4, m6,

m m1, M2, m4, m6, m7, M7, M 8 m 1, M2, m4,, m6, M7, M 8 m 1, M2, m4, m6, M7, M8 ca m1, m4, m 5 m 1, m4,m 5 m 1, m4,m5

p m1, m2, m3, M4, m5, m6, m7, M 8 m 1, m2, m3, M4, m5, m6, M7, M 8 m 1, m2, m3, M4, m5, m6, M7, M8 continued.

row Abdomen IV Abdomen V Abdomen VI a m2, m3, m4, m5, m6, m7

m m1, M2, m3,, m5, m6, M 7 m 2, m3, m4, m5, M 7 m 1 ca m1, m3, m4, m5, m6, m 7 m 3, m4

cp m5, m6

p m0, m1, m2, M5, m6, m7, M 8 m 1, M2, m3s’, M5, m6, M7 M0, m1, M2, m3, M 4 m: micro-mesochaetae; M: macrochaetae.

Figures

FIGURES 1 – 8. Deuteraphorura caprelleana sp. nov.: 1, dorsal chaetotaxy; 2, ventral chaetotaxy of the abdominal sterna; 3, ventral chaetotaxy of the head; 4, chaetotaxy of the labial complex; 5, outer maxillary lobe; 6, chaetotaxy of labial palp; 7, chaetotaxy of the labrum; 8, distal part of leg III.

FIGURES 9 – 13. Deuteraphorura caprelleana sp. nov.: 9, chaetotaxy of the antenna; 10, antennal III sense organ; 11, postantennal organ; 12, mandible; 13, maxillary head with 6 lamellae.