Shell small (<3 mm), not very solid, broadly conical, scalariform, whitish, slightly shiny. Protoconch of type C, with a diameter of about 320 µm. Teleoconch with a little over three whorls, almost flat, very stepped, the last whorl broadly rounded at the periphery. Spire moderately high (h = 70% H). Suture shallow, undulating, with a wide angled shoulder below it.
Axial sculpture formed by about 16 orthocline ribs, angled, elevated, much narrower than their interspaces, prolonged on the base to the aperture. Spiral sculpture present only in the interspaces of the ribs, formed by numerous grooves, narrow, equidistant, only 7-8 between the sutures at the beginning of the last whorl, and about 15 more on the base, becoming tighter where reaching the aperture. In addition there are numerous spiral striae on the shoulder.
Aperture suboval; columella curved, opisthocline; no columellar tooth. Outer lip narrow. Not umbilicated.
Dimensions of the holotype: 2.75 x 1.4 mm; h = 1.85 mm.

* Pyrgulina spifunifortis Penas & Rolan, 2017, described from deep water of the Solomon Islands, has a shell of similar dimensions, also with stepped whorls and with a carinate shelf at the uppermost part of the whorls, but there is a more distinct cord on the shoulder and a depression below it; the axial ribs form projections on the shoulder and there are much more (about 16) spiral grooves between sutures at the beginning of the last whorl, the upper ones nearly obsolete.
* Mumiola carbasea Melvill, 1904, described from deep water of the Persian Gulf (holotype NHMUK 1905.6.12.14 examined), has a shell somewhat higher, narrower (H/D = 2.3 against 1.9 in P. carmeloi n. sp.), the ribs are lower, and they are slightly opisthocline although in the original description are mentioned as orthocline; the spiral sculpture is formed by very thin cordlets, about six between sutures at the beginning of the last whorl, and 8 more, very weak; on the base; it has a weak columellar tooth, although somewhat internal.
* Pyrgulina partimcostae Penas & Rolan, 2017, described from deep water of the Solomon Islands and Madagascar, also has a shell of similar profile but smaller and also the protoconch is smaller; it has a subsutural shelf with a depression below it, the ribs are poorly marked and disappear attenuated below the periphery of the last whorl; the spiral sculpture consists in about 7 spiral grooves, not equally spaced, between sutures at the beginning of the last whorl but there are only eight of them on the base, more evident.

Only known in the infralittoral of the type locality, Aqaba, Red Sea. (Jordan)