Hoplonemertea

Holotype (Carcino B.l. (1), slide 3, worm 1). Stylet bulb region of worm showing pyriform stylet (S) on the basis (B) with two..Holotype (Carcino B.l. (1), slide 3, worm 1). Stylet bulb region of worm showing pyriform stylet (S) on the basis (B) with two accessory stylet pouches (AP) anterior to the middle proboscis chamber (MPC).

Portion of the stylet in the anterior proboscis chamber showing the stylet hub, a portion of the esophagus.

Eosinophilic glands (EG) lining the anterior esophagus.

Stylet bulb region of worm showing two accessory stylet pouches (AP) adjacent to the basis.

Medial section of body with single row of submuscular glands (G) and a presumptive ovum undergoing resorption (Ov).

Schematic diagram of the Malacabdella grossa spermatozoon and its acrosomal region and neck region.From: The spermatozoon of the nemertine Malacobdella grossa Bjorn Afzelius J. Submicro. Cytol., 3, 181-192, 1971 (A) Acrosome (AN) Annulus (AV) Acrosomal vesicle (DC) Distal cenriole (M) Mitochondrial sheath (N) Nucleus (PC) Proximal centriole (PR) Post-acrosomal ring (SA) Subacrosomal material (T) TailWith these considerations as a background a fine structural investigation was started using the sperm of the parasitic nemertine Malacobdella grossa (O. F. Müller). The sperm of this species can be characterized as advanced as evidenced by the studies of Retzius (1904) and Franzén (1956). The mode of fertilization is incompletely known. (A) Acrosome (AN) Annulus (AV) Acrosomal vesicle (DC) Distal cenriole (M) Mitochondrial sheath (N) Nucleus (PC) Proximal centriole (PR) Post-acrosomal ring (SA) Subacrosomal material (T) TailWith these considerations as a background a fine structural investigation was started using the sperm of the parasitic nemertine Malacobdella grossa (O. F. Müller). The sperm of this species can be characterized as advanced as evidenced by the studies of Retzius (1904) and Franzén (1956). The mode of fertilization is incompletely known.From: The spermatozoon of the nemertine Malacobdella grossa Bjorn Afzelius J. Submicro. Cytol., 3, 181-192, 1971(A) Acrosome (AN) Annulus (AV) Acrosomal vesicle (DC) Distal cenriole (M) Mitochondrial sheath (N) Nucleus (PC) Proximal centriole (PR) Post-acrosomal ring (SA) Subacrosomal material (T) TailWith these considerations as a background a fine structural investigation was started using the sperm of the parasitic nemertine Malacobdella grossa (O. F. Müller). The sperm of this species can be characterized as advanced as evidenced by the studies of Retzius (1904) and Franzén (1956). The mode of fertilization is incompletely known.

Dorsal side of anterior portion of body showing markings on head and arrangement of ocelli. Coe, W. R. (1905). Nemerteans of the west and northwest coasts of America.. Bull. Mus. comp. Zool. Harv.. 1-318

Dorsal view of anterior portion of body showing markings on the head and the arrangement of ocelli.Coe, W. R. (1901). The Nemerteans of the Expedition. Proceedings of the Washington Academy of Sciences, Vol. 3, 1-110.

habitusCoe, W. R. (1905). Nemerteans of the west and northwest coasts of America.. Bull. Mus. comp. Zool. Harv.. 1-318

Outline of head to show position of markings and arrangement of ocelli.Coe, W. R. (1901). The Nemerteans of the Expedition. Proceedings of the Washington Academy of Sciences, Vol. 3, 1-110.

Amphiporus bimaculatus: head

Amphiporus bimaculatus: head

Stylets and anterior endBrunberg, L. On the Nemertean Fauna of Danish Waters. Ophelia, 1(1), 77-111.

Plate13.19 Stylet-region of Amphiporus bioculatus

Plate7.25 Spermatozoa of Amphiporus bioculatus

Plate8.3 Amphiporus bioculatus n. s.

Dorsal surface. Red lines represent blood vessels with red blood.Coe, W. R. (1905). Nemerteans of the west and northwest coasts of America.. Bull. Mus. comp. Zool. Harv.. 1-318

Outline of anterior portion of body showing position of ocelli and relation of cephalic to lateral blood vesselsCoe, W. R. (1905). Nemerteans of the west and northwest coasts of America.. Bull. Mus. comp. Zool. Harv.. 1-318

Outline of anterior portion of body showing number and position of ocelli. Coe, W. R. (1905). Nemerteans of the west and northwest coasts of America.. Bull. Mus. comp. Zool. Harv.. 1-318

Amphiporus formidabilis: Close-up of head

Amphiporus formidabilis: Head showing eye pattern

Amphiporus formidabilis: stylet

Amphiporus formidabilis: Stylet (squash prep)

Amphiporus formidabilis: Brain region (squash prep)