Caerostris bankana Strand, 1915

Caerostris bankana Strand, 1915 View in CoL

Fig. 3 View Fig ; Appendix 1

Caerostris bankana Strand, 1915: 225 View in CoL (♀).

Diagnosis

As in C. extrusa ( Figs 4E View Fig , 6C View Fig ), C. darwini ( Kuntner & Agnarsson 2010: fig. 6e), C. kuntneri ( Figs 6I View Fig , 7E View Fig ), C. mitralis ( Grasshoff 1984: figs 19–20, 29–30), C. tinamaze ( Gregorič et al. 2015b: fig. 9c), and C. wallacei ( Gregorič et al. 2015b: fig. 10c), and in contrast to other Afrotropical species of Caerostris , the epigynal hooks in C. bankana ( Fig. 3E View Fig ) are short rather than long, positioned medially on the epigynal plate rather than anteriorly and pointing laterally rather than posteriorly. As in C. kuntneri but in contrast to the above mentioned species of Caerostris , C. bankana has short and stout epigynal hooks that are about as wide as long, while longer in other species of Caerostris . In contrast to all species of Caerostris , the anterior epigynal margin in C. bankana is S-shaped and perpendicular to the longitudinal body axis ( Fig. 3E View Fig ).

Type material

Holotype

MADAGASCAR • ♀; Nosy Be ; SMF3618 About SMF SMF.

Description

Female (holotype, Fig. 3A–E View Fig )

MEASUREMENTS AND COLORATION. Total body length 23.36. Prosoma 7.81 long, 8.05 wide, 6.97 high. Carapace and chelicerae reddish brown, covered with whitish to yellowish setae. Sternum 3.65 long, 3.46 wide, widest between coxae of second legs, brown with whitish setae. AME diameter 0.40, PME diameter 0.34, AME separation 0.52, PME separation 1.22, PME–PLE separation 3.00, ALE–PLE separation 0.07. Clypeus height 1.48. Appendages: palps brown. All leg segments uniformly reddish brown. Leg I femur 6.53, patella 3.71, tibia 5.51, metatarsus 6.55, tarsus 2.47. Opisthosoma 14.96 long, 14.58 wide, 10.22 high. Base color of dorsum light reddish brown, covered with dark reddishbrown spots, with several small, pointy tubercules on anterior half and pair of large posterior tubercules, pointing posteriorly and protruding past spinnerets. Anterior dorsum with broad, whitish speck. Venter light brown with several dark brown spots, two paler, grey, longitudinal bands. Epigynum as diagnosed ( Fig. 3E View Fig ).

Distribution

Strand (1915) described the female he believed to be collected in Bandar Kwala, North Sumatra, Indonesia. However, the specimen closely resembles Malagasy species in morphology, and at the SMF was kept together with two resembling specimens from Nosy Be, Madagascar. As a similar specimen was never again found in Indonesia, Grasshoff (1984) concluded a confusion of specimen locality the most likely. We agree with this assessment and find Nosy Be, Madagascar as the most likely type locality and known distribution of this species.

Remark

Caerostris bankana Strand, 1915 was synonymized with C. extrusa Butler, 1882 by Grasshoff (1984). In epigynal morphology, the type of C. bankana is clearly different from both C. extrusa and C. kuntneri , as well as all other described species of Caerostris . Due to the lack of molecular data for this species, its phylogenetic position within the genus is unclear.