Platygonus marplatensis Reig, 1952

Gasparini, GermAEn M., Moreno-Mancilla, Oscar F. & Cómbita, JosØ L., 2021, Selenogonus narinoensis Stirton, 1947 (Tayassuidae, Cetartiodactyla, Mammalia): taxonomic status and paleobiogeographic implications, Fossil Record 24 (1), pp. 65-75 : 67-68

Platygonus marplatensis Reig, 1952

1927 Homo chapadmalensis, Castellanos , pp. 1–15.

1941 Homo neogaeus (not Lehmann Nitsche, 1907), Vignati, pp. 274–358 (misidentification)

1952 Platygonus marplatensis, Reig , pp. 121–122.

1959 Argyrohyus chapadmalensis, Kraglievich , p. 230. 1977 Platygonus marplatensis, Wetzel , pp. 1–36.

1995 Platygonus marplatensis, MenØgaz and

Ortiz Jaureguizar, pp. 314–315.

2002 Platygonus marplatensis, Quintana , pp. 263–275. 2007 Platygonus marplatensis, Gasparini , pp. 178–183. 2013 Platygonus marplatensis, Gasparini , p. 58.

2017b Platygonus marplatensis, Parisi Dutra et al. , p. 355.

Holotype

MMP-S Type 25. Partial mandible. Layer 3, Chapadmalal Formation, Barranca de los Lobos, General Pueyrredón county , Buenos Aires Province, Argentina; late Pliocene ( Fig. 1c ).

Occurrence

Late Pliocene–earliest Pleistocene (Chapadmalalan Stage/Age, Marplatan Stage/Age (Sanandresian Substage/Subage sensu Cione et al., 2015); coastal cliff in Chapadmalal region and Miramar (General Pueyrredón and General Alvarado counties), in southeastern Buenos Aires Province, Argentina ( Kraglievich, 1952; Reig, 1952; Quintana, 2002; Gasparini, 2004; Gasparini and Ubilla, 2011; Gasparini, 2013) ( Fig. 2 ).

Remarks

Castellanos (1927) referred some teeth exhumed from the southeastern coast of Buenos Aires Province to Homo chapadmalensis . Vignati (1941) included these remains in the species Homo neogaeus Lehmann Nitsche, 1907 , a species based on a fossil found in the Monte Hermoso cliff. Reig (1952) established the species Platygonus marplatensis based on a partial mandible found in the Chapadmalal Formation, Barranca de los Lobos, General Pueyrredón county, Buenos Aires Province. Kraglievich (1959) created the genus Argyrohyus with the species Argyrohyus chapadmalensis and included in the synonym Homo chapadmalensis Castellanos, 1927 ; Homo neogaeus sensu Vignati, 1941 ; and Platygonus marplatensis Reig, 1952 . MenØgaz and Ortiz Jaureguizar (1995) suggested that A. chapadmalensis could be a synonym of Platygonus marplatensis .

Concerning the specific reassignment, it is worth mentioning that Rusconi (1930) included the species Listriodon chapadmalensis Ameghino, 1908 , in the genus Platygonus . This generates a case of secondary homonymy (they are homonyms as a consequence of a new combination and not as a consequence of origin), and it must be solved by priority. Thus, the species of Ameghino, 1908, may continue to be called Platygonus chapadmalensis , while for that of Castellanos, 1927, a replacement must be considered. Therefore, the oldest name is Platygonus marplatensis Reig, 1952 (see Wetzel, 1977; Gasparini, 2007, 2013; Parisi Dutra et al., 2017c).

Figures

Figure 1. Platygonus cf. marplatensis MGN 931 (IGM p002118). (a) Lateral view of the portion of vertical ramus of the left hemimandible; (b) m3 partially preserved. Platygonus marplatensis MMP-S Type 25. (c) Lateral view.

Figure 2. Geographical location of the MGN 931 (IGM p002118) and fossil records of Platygonus marplatensis in South America.