Cratera is a genus of land planarians belonging to the family Geoplanidae found in South America.
Description
The genus Cratera is characterized by having a leaf-shaped body. Most species are between 3 and 7 cm long. The hundreds of eyes distributed along the body are monolobulated, i.e., simple and circular. The copulatory apparatus has a permanent conical penis occupying the entire male cavity. The final portion of the ejaculatory duct, the channel that guides sperm through the penis, has an expanded cavity that resembles a volcanic crater. It is very similar to the related genus Obama, the main difference being the presence of trilobulated eyes in the latter.
Etymology The name Cratera is derived from the Latin word crater and refers to the cavity in the penis that resembles a volcanic crater.
Species There are 24 species assigned to the genus Cratera:
Cratera anamariae Carbayo & Almeida, 2015 Cratera arucuia Lago-Barcia & Carbayo, 2018 Cratera assu Araujo, Carbayo, Riutort & Álvarez-Presas, 2020 Cratera aureomaculata Rossi & Leal-Zanchet, 2017 Cratera boja Araujo, Carbayo, Riutort & Álvarez-Presas, 2020 Cratera crioula (E. M. Froehlich, 1955) Cratera cryptolineata Rossi & Leal-Zanchet, 2017 Cratera cuarassu Carbayo & Almeida, 2015 Cratera hina (Marcus, 1951) Cratera imbiri Araujo, Carbayo, Riutort & Álvarez-Presas, 2020 Cratera joia (Froehlich, 1956) Cratera nigrimarginata Rossi & Leal-Zanchet, 2017 Cratera ochra Rossi, Amaral, Ribeiro, Cauduro, Fick, Valiati & Leal-Zanchet, 2015 Cratera obsidiana Amaral, Boll & Leal-Zanchet, 2019 Cratera paraitinga Araujo, Carbayo, Riutort & Álvarez-Presas, 2020 Cratera picuia Lago-Barcia & Carbayo, 2018 Cratera pseudovaginuloides (Riester, 1938) Cratera steffeni Rossi, Fontoura, Amaral & Leal-Zanchet, 2014 Cratera tamoia (E. M. Froehlich, 1955) Cratera taxiarcha (Marcus, 1951) Cratera tui Araujo, Carbayo, Riutort & Álvarez-Presas, 2020 Cratera viridimaculata Negrete & Brusa, 2016 Cratera yara (E. M. Froehlich, 1955)
References