Mecicobothrium baccai, Lucas, Sylvia Marlene, Indicatti, Rafael Prezzi, Brescovit, Antonio Domingos & Francisco, Rafael Carlo, 2006

Lucas, Sylvia Marlene, Indicatti, Rafael Prezzi, Brescovit, Antonio Domingos & Francisco, Rafael Carlo, 2006, First record of the Mecicobothriidae Holmberg from Brazil, with a description of a new species of Mecicobothrium (Araneae, Mygalomorphae), Zootaxa 1326, pp. 45-53: 46-52

publication ID

http://doi.org/ 10.5281/zenodo.174092

publication LSID

lsid:zoobank.org:pub:E9C6EBD4-DC89-4D65-B76D-47DB3EE346E5

persistent identifier

http://treatment.plazi.org/id/872087A1-FF9F-797F-D041-FB68FC8D5F83

treatment provided by

Plazi

scientific name

Mecicobothrium baccai
status

n. sp.

Mecicobothrium baccai   n. sp.

( Figs. 1–14 View FIGURES 1 – 5 View FIGURES 6 – 11. M View FIGURES 12 – 15 ; 20; 22–25; 27–28; 30–31; 33–34; 36–38)

Types. Male holotype from Parque Natural Municipal Nascentes do Ribeirão Garcia (27 o01’S, 49 o09’W), Blumenau, Santa Catarina, Brazil, 19.X. 2004, R. C. Francisco leg., deposited in IBSP 12533; male paratype, same data as holotype ( IBSP 12534).

Additional material examined. Only one other male with same data as holotype, partially used for illustrations in the scanning microscope ( IBSP 12535).

Etymology. The specific name is a patronym in honor of Dr. Lauro Eduardo Bacca, who has actively worked in the conservation of the Parque Natural Municipal Nascentes do Ribeirão Garcia and other areas in northern Santa Catarina, Brazil.

Diagnosis. Males differ from those of M. thorelli   (for comparison, see figs. 15–19; 21; 26; 29; 32; 35; 39; Gertsch & Platnick, 1979: figs. 35–36; 40–47; 49) by the less pronounced endites ( Figs. 25 View FIGURES 20 – 26 ; 31), presence of slender spines on legs, retrolateral lobe of the cymbium less developed ( Figs. 3–4 View FIGURES 1 – 5 ; 10–11), and longer and straight chelicerae ( Figs. 20 View FIGURES 20 – 26 ; 28; 31).

Description. Male (Holotype). Cephalothorax and legs brownish yellow. Abdomen dorsally pale yellow with grayish transverse black stripes ( Fig. 20 View FIGURES 20 – 26 ), ventral surface and spinnerets pale yellow (Figs. 37–38). Total length, including chelicerae: 5.12. Cephalothorax 1.92 long, 1.50 wide, with short, longitudinal fovea ( Fig. 20 View FIGURES 20 – 26 ). Chelicerae 1.05 long, porrect, with large anterior knobs (Fig. 33) distally with irregular row of 16–18 stiff black setae and two long spurs ( Figs. 6–7 View FIGURES 6 – 11. M ). Basal segment of chelicerae with 11–12 promarginal irregular teeth in row and no teeth on retromargin ( Fig. 8 View FIGURES 6 – 11. M ). Rastellum absent. Intercheliceral tumescence absent. Clypeus 0.10 wide. Eight eyes on black tubercle. Anterior eye row straight, posterior row slightly recurved. Eye diameter: AME 0.12, ALE 0.23, PLE 0.10, PME 0.08. Overall shape of eye group trapezoidal, wider than long.

Labium 0.10 long, 0.32 wide, without cuspules ( Fig. 25 View FIGURES 20 – 26 ). Endites without cuspules, serrula with more than 50 teeth ( Fig. 9 View FIGURES 6 – 11. M ). Sternum 1.12 long, 0.87 wide, with four pairs of marginal sigilla, anterior sigilla inconspicuous. Palp measurements: femur 1.12 / patella 0.72 / tibia 0.79 / cymbium 0.75 / total 3.38; spination: femur 0- 0-9. Legs: measurements: I: femur 1.52 / patella 0.85 / tibia 1.06 / metatarsus 1.00/ tarsus 0.70 / total 5.13; II: 1.37 / 0.81 / 0.85 / 0.94 / 0.72 / 4.69; III: 1.30 / 0.69 / 0.76 / 1.05 / 0.82 / 4.62; IV: 1.50 / 0.81 / 1.05 / 1.40 / 0.99 / FIGURES 27–39. Mecicobothrium   spp. 27, 28, 30, 31, 33, 34, 36–38. M. baccai   n. sp. 27 –28, 30–31, 33. Cheliceral apophysis. 27. Frontal view; 28. Dorsal view; 30. Teeth of chelicerae, ventral view; 31. Ventral view; 33. Retrolateral view; 34. Tarsus I, retrolateral view; 36. Tergal plates, dorsal-anterior view; 37. Posterior lateral spinnerets, dorsal view; 38. Abdomen and spinnerets, retrolateral view; 29, 32, 35, 39. M. thorelli   . 29, 32. Cheliceral apophysis. 29. Dorsal view; 32. Ventral view; 35. Tarsus I, retrolateral view; 39. Abdomen, retrolateral view. Scale bars = 0,5 mm. Photos: R. P. Indicatti.

5.75; spination: I: femur d 1 -0-0, tibia v 1 r- 1 r- 2 p, without clasping spines or spurs, metatarsus v 1 r- 0-1 r; II: femur d 1 - 1 -0, patella d 2, tibia d 1 - 1 -0, v 1 r- 1 r- 1 p, metatarsus d 0-1 - 0, v 1 r- 1 p- 2; III: femur d 1 - 1 -0, patella d 4, r 1, tibia d 0-1 -0, v 1 r- 1 r- 2, p 1 - 1 -0, r 0-1 -0, metatarsus v 1 p- 2 - 2, p 1 - 1-2, r 1 - 0-1; IV: femur d 1 - 1 -0, patella d 2, r 1, tibia v 1 p- 1 p- 2, p 1 - 1 - 0, r 1 - 1 - 1, metatarsus v 1 p- 1 p- 2, p 1 - 1-2, r 1 - 1 - 1. Scopulae slight on all tarsi. Tarsi I –IV pseudosegmented ( Figs. 12 View FIGURES 12 – 15 , 34). Superior tarsal claws I-IV with one row of 5–7 teeth and distal short conical projection next to short onychium ( Fig. 13 View FIGURES 12 – 15 ). Third claw on all tarsi ( Fig. 13 View FIGURES 12 – 15 ). Tarsal organ slightly elevated, with concentric ridge pattern ( Fig. 14 View FIGURES 12 – 15 ). Abdomen with two tergal plates well separated, anterior with five spiniform setae; dorsal with two ( Figs. 20 View FIGURES 20 – 26 ; 36). Six spinnerets (Fig. 38), anterior median APS 0.37; anterior lateral twosegmented, BAS 0.22, APS 0.36; posterior lateral three-segmented, BAS 0.37, MAS 0.50, apical segment pseudosegmented, 0.84 long, (Fig. 37). Palp without stout tibia, cymbium with distinct prolateral lobe and retrolateral invagination elongated, bulb half length of cymbium, conductor shielding corkscrew-shaped embolus basally ( Figs. 1–5 View FIGURES 1 – 5 ; 10–11; 22–24).

Female. Unknown.

Variation. Three males: total length 5.12 –6.00, carapace 1.92–2.10, femur I 1.52–1.55.

Natural history. All specimens were collected in pitfall traps in a protected area of northern Santa Catarina (Vale do Itajaí, Blumenau). This area is a remnant of secondary Atlantic Forest, as described by Bacca (1988). The biology of this species is probably similar to those described by Costa & Pérez-Miles (1998) for Mecicobothrium thorelli   , since these two species present the same cheliceral conformation and cryptic habits.

Distribution. Known only from the type locality.

IBSP

Instituto Biologico de Sao Paulo

BAS

Bulgarian Academy of Science