Pontigulasia Rhumbler, 1895 (ref. ID; 3567, 3686) or 1896 (ref. ID; 3693)

[ref. ID; 1618]
Test similar to that of Difflugia, but with a constriction of neck and internally a diaphragm made of the same substances as those of the test. (ref. ID; 1618)

[ref. ID; 1923]
Shell with internal partition or diaphragm, with deeply constricted neck and transverse perforated partition at the point of constriction. A widely distributed genus, comprised of about 7 species. The internal partition or diaphragm of Pontigulasia may be overlooked in living animals. It appears clearly when the shell is mounted in Canada balsam. (ref. ID; 1923)

[ref. ID; 3686]
Shell yellow or brown; ovoid or pyriform with a constriction to form a neck; composed of agglutinated mineral particles; aperture terminal, circular having an internal transverse diaphragm on level with neck constriction. (ref. ID; 3686)

Pontigulasia compressa Carter, 1864 (ref. ID; 1316, 2022, 2147, 2456, 3686) reported year? (ref. ID; 3501)
Syn; Difflugia compressa Carter, 1864 (ref. ID; 1316)
Description; See Difflugia sphincta.
The shell is brown, ovoid or pyriform, with a short neck that joins the body in a V-shaped wedge. Convex protruberances arise from each arm of the V-shaped wedge to give this species its characteristic shape. In lateral view it is compressed. It has a rough surface composed of different sizes of sand- or quartz-grains arranged on an organic matrix. The aperture is circular or ovoid, and internally at the junction of the neck is a perforated diaphragm. This species varies considerably in size and in the composition of the shell, often large particles are used to construct the shell and mask the characteristic outline of the convex protruberances. (ref. ID; 3686)
Measurements; Length of shell 196-289; breadth of shell 166-222; depth of shell 107-179; diameter of aperture 45-75 um (n = 17). (ref. ID; 3686)
Pontigulasia elisa Penard, 1893 (ref. ID; 3686) reported year? (ref. ID; 1316)
Syn; Difflugia elisa Penard, 1893 (ref. ID; 1316)
Description; The shell is brown, pyriform with a distinct constriction to form a neck region, and it is oval circular in transverse section. It has a rough surface which is composed mainly of small grains. The aperture is circular, and surrounded by an irregular arrangement of small sand particles. An internal, perforated, diaphragm is present across the neck, at the junction of the neck with the main body. (ref. ID; 3686)
Comments; Penard (1902) describes four species with distinct necks: P. incisa (= P. elisa); P. bryophila; P. spectabilis (=P. vas) and P. spiralis, all having the same range of size, but differing in structure and also the form of the internal diaphragm. (ref. ID; 3686)
Measurements; Length of shell 118-144; breadth of shell 80-92; depth of shell 74-84; diameter of aperture 29-35 um (n = 3). (ref. ID; 3686)
Pontigulasia vas Leidy (ref. ID; 1316, 1618, 1923) or (Leidy) Schouteden (ref. ID; 4643)
Syn; Pontigulasia spectabilis Penard (ref. ID; 4643) reported author and year? (ref. ID; 1923); Difflugia vas Leidy, 1874 (ref. ID; 1316)
Description; Round or ovoid test; constriction deep and well-marked; with sand-grains and other particles; aperture terminal; fresh water ponds. Stump (1943) made a study of the nuclear division of the organism. During metaphase eight to twelve "chromosomes" form a well-defined equatorial plate; average time for completion of the division was found to be eighty minutes. (ref. ID; 1618)
Resembling Difflugia oblonga in appearance except for the deeply constricted neck. Internal partition well observed only in oral view, with 2 to 4 perforations. Sometimes with zoochlorellae. Habitat subaquatic mosses at pond sides and in wet Sphagnum. (ref. ID; 1923)
Measurements; Length 125-170 um. (ref. ID; 1618, 1923)