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Fig. 6 | BMC Ecology and Evolution

Fig. 6

From: Evolutionary pattern of karyotypes and meiosis in pholcid spiders (Araneae: Pholcidae): implications for reconstructing chromosome evolution of araneomorph spiders

Fig. 6

Ninetinae, males, detection of NORs (FISH). Figures contain scheme of sex chromosomes (red = NOR). Arrowhead = chromosome (b), bivalent (a, c) or multivalent (a) with NOR, M = sex chromosome multivalent, open arrowhead = sex chromosome-linked NOR, X = X chromosome. a, b Kambiwa neotropica (X1X2X3X4Y) a Metaphase I, three bivalents contain terminal NOR. Moreover, sex chromosome multivalent (delimited by line) includes a tiny NOR at end of one “arm”. Note scheme for morphology of multivalent. b Metaphase II (n = 16) containing four X chromosomes. Two X chromosomes are the most condensed elements of the plate (XC). Two other X chromosomes have lower condensation and monoarmed morphology (Xs). Note scheme for morphology of monoarmed X chromosomes. One monoarmed X contains a NOR at short arm. In addition, three other chromosomes bear a NOR; c Pholcophora americana (X1X2Y), metaphase I. Two large bivalents contain terminal NOR. Note scheme for probable morphology of sex chromosome multivalent. Arms of each X chromosome are associated with each other. Bar = 5 µm

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BMC Ecology and Evolution

ISSN: 2730-7182

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