Kawakatsua Sluys & Laumer 2019, gen. nov.

Genus Kawakatsua Sluys, gen. nov.

Etymology. The generic name honours the triclad specialist Prof. Dr. Masaharu Kawakatsu in recognition of his major contribution to the field of planarian systematics. Gender: feminine.

Diagnosis. Dimarcusidae without pigmentation or eyes; pharynx located in the posterior half of the body; mouth opening located halfway in the pharyngeal cavity; few, principally ventral testes distributed irregularly in the body and extending from a position far posterior to the ovaries to directly behind the pharyngeal cavity; ovaries situated ventrally at some distance behind the brain; sperm ducts strongly recurve, forming a loop, before uniting to give rise to the ejaculatory duct; cone-shaped penis papilla oriented horizontally; posterior to gonopore oviducts turn dorso-medially, uniting to form common oviduct, which is oriented more or less perpendicular to the bursal canal and opens into the latter shortly before the canal communicates with the copulatory bursa; sac-shaped copulatory bursa lacks a distinct, single lumen and is mostly filled with a mass of syncytial cells, with interspersed nuclei.