Table 1

Analysis of various aspects of male spermatogenesis in different 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


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].

Piergentili BMC Cell Biology 2007 8:35   doi:10.1186/1471-2121-8-35

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