cirrus sac

cirrus sac

[′sir·əs ‚sak]
(invertebrate zoology)
A pouch or channel containing the copulatory organ (cirrus) in certain invertebrates.
References in periodicals archive ?
Yamaguti (1971) listed Tanaisia, Lepidopteria, Ohridia, Paratanaisia and Tamerlania, all as subgenera of the genus Tanaisia Skrjabin (1924) and differentiated the subfamily Tanaisiinae (having seminal receptacle while lacking Cirrus sac) from the subfamily Eucotylinae (having Cirrus sac while lacking seminal receptacle).
2002) in which they differentiated the subfamily Tanaisiinae characterized by absence of annular cervical thickening; Cirrus sac absent; intercaecal testes and caeca forming cyclocoel at the posterior end, from the subfamily Eucotylinae by having annular cervical thickening; Cirrus sac present; testes extracaecal or overlapping caeca and caeca do not unite posteriorly.
Sagittal sections of adult worms showed the cirrus sac lying horizontally with the seminal vesicle lying dorsocaudal to it.
Genital pore and cirrus sac in posterior third of body or at posterior tip of body, some distance from ventral sucker, ventral to gonads or ventral to ceca.
Genital pore is at the base of oesopahgus, cirrus sac long extending between anterior level of acetabulum and base of oesophagus, testes 10 in two inter-caecal rows in posterior half of the body.
Cirrus sac long, intercecal, curved dorsally containing prominent elongate seminal vesicle and long pars prostatica.
Testes are two a little behind acetabulum, postequatorial symmetrical, rounded, seminal vesicle elongate, preacetabular and far anterior to it, cirrus sac is also elongate, concave ventrally and convex dorsally, internal structure not differentiated, pars prostatica not visible, genital pore post bifurcal and submedian.