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Table 1 Analysis of various aspects of male spermatogenesis in different drosophilids

From: Evolutionary conservation of lampbrush-like loops in drosophilids

species (in alphabetical order) sperm length (mm) sperm tail entering eggs (mm) T53-F1 staining in tails loop size Loop shape overlap nucleus shape
D. acanthoptera 5.83 ± 0.09 (++) yes 3 d weak S
D. americana 5.22 ± 0.02 nd yes 1 d weak S
D. bifurca 58.29 ± 0.67 1.6 yes 1 d strong O
D. funebris 8.29 nd yes 1 d strong S
D. hydei 23.32 ± 0.51 1.31 yes 2 d strong O
D. littoralis 7.72 ± 0.08 (++) yes 3 f strong S
D. mauritiana 1.036 nd yes 2 f weak S
D. melanogaster 1.9 ± 0.01 1.78 yes 3 f strong S
D. mercatorum nd nd yes 3 d strong O
D. novamexicana 6.72 ± 0.15 nd yes 3 f weak S
D. pseudoobscura 0.36 0.36 yes 2 d strong S
D. sechellia 1.649 nd yes 2 d weak S
D. simulans 1.14 ± 0.01 1.14 yes 3 d weak S
D. tessieri 1.0 to 2.0 nd yes 3 d none S
D. texana 5.08 ± 0.04 nd yes 2 d weak S
D. virilis 5.70 ± 0.16 nd yes 3 f weak S
D. yakuba 1.681 nd yes 3 f none S
  1. Data reported in the first three columns are partially taken from [13, 41, 49-51], and (++) indicates that almost the entire sperm tail enters the egg. Columns 5, 6 and 7 refer to the structures decorated by T53-F1 inside primary spermatocytes, as described in the Results section. In particular, loop size refers to the relative extension of the immunostaining inside the primary spermatocyte nucleus, 3 meaning very extensive loop, and 1 meaning very small loop. Loop shape indicates its filamentous (f) or dense (d) appearance. Overlap is "strong" when immunostaining and phase-contrast visible structures inside primary spermatocytes nuclei are the same, "weak" when the structures are only partially overlapped; "none" indicates that immunostained structures do not have a counterpart visible by phase-contrast. Nucleus shape, S indicates spherical or nearly spherical, O indicates other shapes (see Figure 2 and the Discussion section for further explanations). Cytological data about D. melanogaster, D. hydei, D. virilis and D. novamexicana partially come from [30].