New fossil genus and new extant species of diatoms (Stephanodiscaceae, Bacillariophyceae) from Pleistocene sediments in the Neotropics (Guatemala, Central America): adaptation to a changing environment? Author Paillès, Christine Aix-Marseille Université, CNRS, IRD, Collège de France, INRAE, CEREGE, 13545 Aix-en-Provence cedex 4, France. pailles@cerege.fr Author Sylvestre, Florence Aix-Marseille Université, CNRS, IRD, Collège de France, INRAE, CEREGE, 13545 Aix-en-Provence cedex 4, France. sylvestre@cerege.fr Author Tonetto, Alain Aix-Marseille Université, Fédération de Chimie, PRATIM, 3 Place Victor Hugo, 13331 Marseille Cedex 3, France. alain.tonetto@univ-amu.fr Author Mazur, Jean-Charles Aix-Marseille Université, CNRS, IRD, Collège de France, INRAE, CEREGE, 13545 Aix-en-Provence cedex 4, France. mazur@cerege.fr Author Conrod, Sandrine Aix-Marseille Université, CNRS, IRD, Collège de France, INRAE, CEREGE, 13545 Aix-en-Provence cedex 4, France. conrod@cerege.fr text European Journal of Taxonomy 2020 2020-11-30 726 1 23 journal article 10.5852/ejt.2020.726.1169 778b3715-635c-4d46-9d08-8d355fa91d5f 2118-9773 4298412

Table 1 (continued on the next page). Selected limnological and chemical data from lakes (single measurements in 2005 or 2008) containing Discostella gabinii Paillès & Sylvestre sp. nov. and Cyclotella petenensis Sylvestre, Paillès & Escobar in the Yucatan Peninsula after Pérez et al. (2013). n.d. = not determined.

	Guatemalan highlands				Peten lowlands
Lake name	Amatitlan Atescatempa Guija			Izabal	Salpeten	Bacalar-1	Bacalar-2
Lake ID	19	22	21	1	26	13	13
Latitude N	14°26′03.7″	14°13′01.1″	14°15′43.7″ 15°29′24.5″ 16°58′38.2″ 18°39′54.0″ 18°39′54.0″
Longitude W	90°32′58.6″	89°41′39.2″	89°32′11.3″ 89°08′32.7″ 89°40′30.9″ 88°23′27.0″ 88°23′27.0″
Species (%)
C. petenensis	0.0	0.0	0.0	0.8	0.0	0.7	2.1
D. gabinii sp. nov.	13.2	0.3	5.0	0.0	2.0	0.2	0.2
Limnological parameters
Max sampling depth (m)	0.5	0.5	0.5	14	38	65	16.3
Altitude (m a.s.l.)	1200	587	433	4	114	1	1
Surface area (km2)	23	1.1	45	645	2.9	51	51
Temperature (°C)	22.8	27.3	26.2	26.4	25.4	28.8	27.1
DO2 (mg / L)	18.7	6.7	7.7	7.6	0.8	0.4	7.9
pH	9.3	8.0	8.4	8.3	7.3	6.9	7.8
Cond. (µS / cm)	630	283	206	216	4250	1400	1226
Secchi depth (m)	0.1–0.8	0.1	1.4	n.d.	0.8	10.3	10.3
Chemical variables (mg / L)
HCO - 3	234.8	182.9	121.9	119.6	140.3	305.6	187.3
SO 2- 4	n.d.	n.d.	n.d.	8.4	n.d.	1337.2	1300
Cl-	n.d.	n.d.	n.d.	6.6	n.d.	81.3	85
Na+	123.8	23.1	16.5	7.5	128.2	70.9	44.9
K+	n.d.	n.d.	n.d.	1.9	n.d.	0.7	0.7
Ca2+	23.2	23.3	26.9	25.9	795.8	460.3	399.6
Mg2+	16.5	10.5	8.07	7.3	360.7	80.6	77.6
		Yucatan lowlands			Cenotes	Coastal	Ponds
Lake name	Ocom	Coba	Yalahau-05	Yalahau-08	Juarez	Progreso	Belize 2
Lake ID	15	61	18	18	60	35	7
Latitude N	19°28′28.6″	20°29′40.2″	20°39′25.9″ 20°39′25.9″ 20°48′09.6″ 18°13′05.2″ 17°18′17.9″
Longitude W	88°03′17.9″	87°44′19.2″	89°13′02.0″ 89°13′02.0″ 87°20′23.8″ 88°24′35.2″ 88°29′18.9″
Species (%)
C. petenensis	0.0	0.0	1.3	17.8	0.0	4.0	0.0
D. gabinii sp. nov.	3.7	0.6	1.3	0.0	4.8	0.0	0.1