Fig. 2.

Meiotic configuration on different specimens of T. obscurus. a Cytotype B, with seven bivalents. b Cytotype C and D, with one trivalent and five bivalents. c Cytotype E, with six bivalents. d Cytotype F with three bivalents and two trivalent. e Cytotype G with four bivalents and one trivalent. f Cytotype A with eight bivalents. g Cytotype A with six bivalents and one quadrivalent. h Cytotype A with quadrivalent at beginning of pachytene (arrows points the asynaptic region). i Synaptonemal complex analysis in an early pachytene of cytotype A with quadrivalent; the arrow points the asynaptic region of the quadrivalent. j An schematic interpretation of Fig. 2I. k Cytotype A with quadrivalent at end of pachytene; note the full pairing of the quadrivalente. l Metaphase II, with eight chromosomes. Arrows in (b) (d) and (e) point trivalent associations. Barr = 10 μm