. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 334 S. M. SHUSTER. Figure 4. (a) Sperm in the oviduct of a half-molted female; (h) iso- lated spermatozoon; as = acrosome; md = portion of oviduct leading tomarsupium; od = oviduct; ov = ovum;sm = sperm mass; v = vagina. as the vaginae of premolt females are fused prior to the reproductive molt and are physically incapable ofacco- modating male genitalia (details of female reproductive morphology in Shuster, 1986). All half-molted females collected in the field (n = 19) possessed a whitish sperm mass in each oviduct. As men-
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 334 S. M. SHUSTER. Figure 4. (a) Sperm in the oviduct of a half-molted female; (h) iso- lated spermatozoon; as = acrosome; md = portion of oviduct leading tomarsupium; od = oviduct; ov = ovum;sm = sperm mass; v = vagina. as the vaginae of premolt females are fused prior to the reproductive molt and are physically incapable ofacco- modating male genitalia (details of female reproductive morphology in Shuster, 1986). All half-molted females collected in the field (n = 19) possessed a whitish sperm mass in each oviduct. As men- tioned above, females possess simple oviducts, with no sperm storage organs (Shuster, 1986). The sperm masses of inseminated females were visible through the ventral cuticle and were located approximately mm inside of this opening, directly within the lumen of the oviduct. Sperm in the oviduct formed a loosely organized bundle (Fig. 4a). Intact sperm are approximately mm in length, consisting of a long tail and a flange-like acro- some that is clearly visible at 70X (Fig. 4b). Within the reproductive tracts of half-molt females, sperm are non- motile. Postmolt females transport ova through their oviducts and into ventral pouches that form the marsupium (Shuster, 1986). Spent ovaries form an H-shaped bag that lies over the brood pouches when viewed dorsally (details in Shuster, 1986). While no intact sperm were found in the reproductive tracts of postmolt females (n = 19), sperm tails, minus their acrosomes, were distrib- uted throughout the spent ovaries and occasionally found within the oviducts. The effect oj a-males on the initiation and duration of female sexual receptivity Premolt females retained with «-males molt signifi- cantly sooner than premolt females retained in cups alone (one-tailed U-test, P = ). Premolt females iso- lated in cups molted about five days after capture (me- dian = h, range = h, x ± SD = ± , n = 20),
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