Campylothorax mitrai Bellini & Meneses, 2012

Bellini, Bruno Cavalcante & Cipola, Nikolas Gioia, 2017, The Neotropical genera of Paronellinae (Collembola, Entomobryoidea, Paronellidae) with description of two new species and redescription of Campylothorax mitrai, Zootaxa 4300 (2), pp. 151-179 : 162-169

Campylothorax mitrai Bellini & Meneses, 2012

Figs 30–61

Campylothorax mitrai Bellini & Meneses, 2012: 451 , figs 1–13, Alagoas state, Brazil (orig. descr.). Cipola & Oliveira, 2016: 493 (key). Santos et al. 2016: 1, 12, 22 (cit.). Soto-Adames, 2016: 12, 26 (compared).

Type material. Holotype male plus six female and two males paratypes were studied, Brazil, Alagoas State, Rio Largo municipality, Universidade Federal de Alagoas, Centro de Ciências Agrárias, (09°27'50"S; 35°50'02"W), Atlantic Forest Biome , 19.xi.2010, pitfall-traps, I.P.S. Santos coll. Material deposited at CM/ MNRJ.

Other material studied. Two males and three females on slides and 14 specimens in alcohol (INPA), same data as type series. Four males and eight females on slides ( DBEZ / UFRN and INPA) , same data as type series, excepty Parque Municipal de Maceio , 09°36'44"S; 35°45'40"W. One female and one juvenile on slides and three specimens in alcohol ( INPA) , same data as type series, excepty Bairro Serraria , 09°35'18"S; 35°44'02"W, 11- 13.i.2014 .

Redescription. Habitus typical of Campylothorax , body bent between Th. III Abd. I. Measurements and color pattern as in the original description. Brownish heavily ciliate apically truncate or rounded scales covering Ant. I and II, basal halves of Ant. III and IV, head, thorax, abdomen, legs and furcula. Collophore with few scales on posterior face. Head and trunk with reduced number of mac.

Head ( Figs 30–39 ). Antennae longer than body, antennal ratio as I: II: III: IV = 1: 1: 1.23: 1.21 in holotype. Ant. IV annulated, without apical bulb and with at least three types of chaetae: blunt sensilla, smooth acuminate chaetae and ciliate chaetae ( Fig. 30 ). Ant. III sense organ with two rod-like sensilla, two surrouding guard sensilla (third one not seen but possibly present), plus some ciliate and smooth chaetae ( Fig. 31 ). Ant. I with 7 dorsal mac of different sizes ( Fig. 32 ); dorso-proximal lateral region with about 21 smooth mic ( Fig. 33 ). Eyes 8+8, G and H vestigial, A-F subequal, with 3–4 interocular chaetae ( Fig. 34 ). Dorsal chaetotaxy with 10 antennal mac (An), 4 anterior (A), 3 medio-ocellar (M), 5 sutural (S), 2 post-sutural (Ps) and 3–2 postoccipital anterior (Pa) chaetae; anterior and post-ocular (Pa6) bothriotricha present ( Fig. 34 ). Four prelabral smooth chaetae ( Fig. 35 ). Labral formula 5 (p0–2), 5 (m0–2), 4 (a1–2), all smooth chaetae, chaetae on posterior row larger than others ( Fig. 35 ). Labral papillae without spine like projections ( Fig. 36 ). Labial basolateral and basomedian fields with M1–2 ciliate, R, E, L1–2, A1–5 smooth; A2 larger than A1, L2 smaller than L1 but not minute; R normal in size ( Fig. 37 ). Labium with five smooth proximal chaetae; labial palp with five main papillae (A–E), and with 0, 5, 0, 4, 4 guard chaetae, respectively; papilla E with lateral process (l.p.) finger-shaped; H (main hypostomal chaeta) with two accessorial hypostomal chaetae ( Fig. 37 ). Maxillary outer lobe with one apical appendage and one subapical chaeta, both smooth, apical appendage longer; sublobal plate with two smooth appendages ( Fig 38 ). Ventral chaetotaxy as in Fig. 39 , all chaetae ciliate, scales present; cephalic groove with 7+7 marginal chaetae, three anterior smaller; two posterior chaetae present or absent ( Fig. 39 ).

Thorax chaetotaxy ( Figs 40–41 ). Th. II with 1 S-microchaeta (ms), 1 anterolateral sens (al), and 7 posterior mac (p1–4 plus 3 secondary chaetae) ( Fig. 40 ). Th. III with 1 anterolateral sens (al) and 4 central mac (a4–5, p2–3) ( Fig. 41 ).

Abdomen chaetotaxy ( Figs 42–46 ). Abd. I with 1 S-microchaeta (ms); 1 anterior (a6), 4 medial (m2–4, 6), and 1 posterior (p6) mic ( Fig. 42 ). Abd. II with 1 anterosubmedial sens (as), bothriotricha m2 and a5 present surrounded by 4 fan-shaped chaetae each; mac m3 and m5 present plus 5 lateral mic (a6–7, m6, p6–7) ( Fig. 43 ). Abd. III with 1 S-microchaeta (ms), 1 anterosubmedial sens (as), bothriotricha m2, m5 and a5 present, surrounded by 2, 4 and 6 fan-shaped chaetae respectively; mac m3, am6, pm6, p6 and a7 (which can be mes) present ( Fig. 44 ). Abd. IV with 1 anterosubmedial sens (as) and 1 posterior sens (ps) plus about 21 other central sens; primary bothriotricha T2 and T4 plus secondary B6 and F3p? and 2 bothriotricha-like lateral chaetae present; T2 and T4 surrounded by 4 and 3 fan-shaped chaetae respectively; row ‘A’ with 4 (A0?–1, A5–6), ‘B’ with 3 (B3–5), ‘D’ with 1 (D3), ‘E’ with 2 (E2–3), ‘F’ with 3 (F1–3), and ‘Fe’ with 1 (Fe2?) mac; 11+11 posterior chaetae ( Fig. 45 ). Abd. V with 1 anterosubmedial sens (as) and 2 accessory sens (acc.p4–p5), 2 anterior (a5–6), 2 medial (m2, m5), and 5 posterior (p1, p 3i –5) mac ( Fig. 46 ).

Legs ( Figs 47–55 ). Subcoxa I external face with one posterior chaeta and two pseudopores ( Fig. 47 ), internal face with about 17 ciliate chaetae ( Fig. 48 ); subcoxa II external face with one anterior row of 11 plus two proximal chaetae, posterior row with five chaetae plus two pseudopores ( Fig. 49 ); subcoxa III external face with three anterior and 11 posterior chaetae plus two pseudopores ( Fig. 50 ). Trochanter I external face with 18–19 proximal chaetae ( Fig. 51 ). Trochanteral organ with approximately 23 spine-like smooth chaetae ( Fig. 52 ). Tibiotarsi I–III with about 13 erect spine-like weakly ciliate inner mac ( Fig. 53 ). Ungues with four inner teeth, one pair basal, one unpaired median, and one minute unpaired distal plus a pair of outer lateral teeth and one smaller dorsal tooth. Unguiculi weakly truncate, all lamellae smooth, smaller in the first and second pairs of legs ( Figs 54–55 ). Tenenthairs smooth, subequal or slightly longer in length than the ungues ( Figs 54–55 ). Pretarsal chaetae absent ( Figs 54– 55 ). Tibiotarsus III lacking smooth inner distal chaeta ( Fig. 55 ).

Collophore ( Fig. 56 ). Anterior side with three large ciliate chaetae plus six surrounding ciliate smaller chaetae ( Fig. 56 ); lateral flap with about 23–24 smooth chaetae ( Fig. 56 ); posterior side densely covered by ciliate chaetae and some scales, modified distal chaetae not seen (unclear) ( Fig. 56 ).

Retinaculum, genital plate and furcula ( Figs 57–61 ). Retinaculum rami with four teeth; corpus with one weakly ciliate chaeta ( Fig. 57 ). Male genital plate as in Fig. 58 , circinate and with 19 surrounding plus two guard smooth chaetae. Manubrium without spines, manubrial plate with four ciliate chaeta plus three pseudopores ( Fig. 59 ). Dens smooth and cylindrical with about 46 internal and 16 ciliate spiniform mac of different sizes ( Fig. 60 ). Mucro long and rectangular with five teeth, four apical and one proximal ( Fig. 61 ).

Remarks. The redescription of C. mitrai corrects mistakes and lack of information of the original description. The most important corrections are related to the absence of pretarsal chaetae, presence of ciliate spiniform mac of different sizes on dens and presence of a fifth tooth on proximal mucro. Concerning the dental spiniform mac, most of the central ones are long and can easily be confused with other chaetae; they are more easily distinguished from other chaetae at proximal dens. The proximal mucronal tooth can be reduced or well-marked in different specimens, which led to the original mistake.

After redescription the most diagnostic features of C. mitrai among other species of the genus are the combination of: body darkly pigmented, S2–3 chaetae on dorsal head as mic, Th. II with 7 posterior mac, Th. III with 4 central mac, and 3+3 large chaetae on anterior side of collophore. The species resembles especially C. sabanus in color pattern, but they differ in: pre-labral chaetae (smooth in C. mitrai vs. ciliate in C. sabanus ), chaeta L 2 in labial region extremely reduced in C. sabanus (normal in C. mitrai ), dorsal head chaetae S2–3 (mic in C. mitrai vs. mac C. sabanus ), Abd. IV posterior central mac (5 in C. mitrai vs. 6 in C. sabanus ) and unguiculus with smooth edges in C. mitrai vs. with one finely serrated edge in C. sabanus ( Mari Mutt 1987a, Soto-Adames 2016).

Figures

FIGURES 30 – 34. Campylothorax mitrai: 30, apex of Ant. IV; 31, Ant. III organ and associated chaetae; 32, Ant. I dorsal mac; 33, Ant. I proximal mic; 34, dorsal cephalic chaetotaxy.

FIGURES 35 – 39. Campylothorax mitrai head: 35, prelabral and labral chaetotaxy; 36, labral papillae region; 37, labial region and proximal chaetae, left side; 38, maxillary outer lobe and sublobal plate, left side; 39, post-labial ventral head chaetotaxy.

FIGURES 40 – 44. Campylothoraxi mitrai dorsal chaetotaxy of trunk, right side: 40, Th. II; 41, Th. III; 42, Abd. I; 43, Abd. II; 44, Abd. III.

FIGURES 45 – 46. Campylothoraxi mitrai dorsal chaetotaxy of trunk, right side: 45, Abd. IV, 46, Abd. V.

FIGURES 47 – 55. Campylothoraxi mitrai legs: 47, subcoxa I external face; 48, subcoxa I internal face; 49, subcoxa II external face; 50, subcoxa III external face; 51, trochanter I chaetotaxy; 52, trochanteral organ; 53, tibiotarsus III; 54, distal tibiotarsus and empodial complex I; 55, distal tibiotarsus and empodial complex III.

FIGURES 56 – 61. Campylothoraxi mitrai: 56, collophore chaetotaxy, lateral view; 57, retinaculum; 58, male genital plate; 59, manubrial plate; 60, distribution of dental spines; 61, distal dens and mucro.