P. costaricensis (Brenes & Arroyo, 1962) n. comb.

Type host. Blue-crowned motmot, Momotus momota (Linnaeus) ( Coraciiformes: Momotidae).

Type locality. Quepos, Puntarenas Province, Republic of Costa Rica.

Remarks. This species was originally described as Cyclocoelum (Hyptiasmus) costaricensis Brenes & Arroyo, 1962 . It has an intertesticular ovary that forms a triangle with the testes (Cyclocoelinae) and a postpharyngeal genital pore suggesting placement in Selfcoelum; however, unlike species of Selfcoelum, the vitelline fields are confluent posteriorly (“vitelline glands are formed by numerous follicles which are attached posteriorly”) (Fig. 4 of Brenes & Arroyo 1962) in this species, placing it in Psophiatrema. Psophiatrema costaricensis n. comb. differs from Psophiatrema greineri Dronen & Kinsella, 2009 only in that it lacks a rudimentary oral sucker. Given the localities where these two species were found (Republic of Costa Rica, southern Central America vs Guyana, northern South America, respectively) and the problems related to distinguishing a rudimentary oral sucker in cyclocoelids (discussed later in this paper) it is possible that these two species are synonymous. No oral or ventral sucker described—Brenes & Arroyo (1962).