Polyzygia neodevonica neodevonica ( Matern, 1929 )

Maillet, Sebastien, Milhau, Bruno, Vreulx, Michel & Posada, Luis-Carlos Sánchez De, 2016, Givetian ostracods of the Candás Formation (Asturias, North-western Spain): taxonomy, stratigraphy, palaeoecology, relationship to global events and palaeogeographical implications, Zootaxa 4068 (1), pp. 1-78 : 38-39

Polyzygia neodevonica neodevonica ( Matern, 1929)

(Pl. II: Figs. 26 & 27)

1929 Dizygopleura neodevonica nov. sp.; Matern: 42, pl. 3, fig. 30.

1964 Polyzygia neodevonica (Matern) ; Magne: pl. 27, figs. 210–217, pl. 30, fig. 282. non 1964 Polyzygia neodevonica (Matern) ; Magne: pl. 30, fig. 281.

1965 Dizygopleura neodevonica Matern ; Gayet: 81–82, pl. 11, figs. 301–303. 1969 Polyzygia neodevonica (Matern) ; Groos: 21, pl. 4, fig. 7.

1971a Polyzygia neodevonica (Matern) ; Becker: 44–47, pl. 7, figs. 58–66. 1972 Polyzygia neodevonica (Matern) ; Michel: 232–235, pl. 13, figs. 1–7, pl. 14, figs. 1–5, pl. 15, fig. 2. 1974 Polyzygia neodevonica (Matern) ; Lethiers: 75, 77, text-figs. 1–2.

1977 Polyzygia neodevonica (Matern) ; Casier: 2–4, 6–10, 12–16.

1974 Polyzygia neodevonica (Matern) ; Becker & Bless: 9–10, ann. 8.

1982 Polyzygia neodevonica (Matern) ; Lethiers: 43.

1982 Polyzygia neodevonica (Matern) ; Milhau: 22, pl. 5, figs. 136–137.

1982 Polyzygia neodevonica (Matern) ?; Casier: 197.

1983a Polyzygia neodevonica (Matern) ; Milhau: 351, 353, pl. 1, fig. 14.

1984 Polyzygia neodevonica (Matern) ; Lethiers: 33, 36, pl. 1, figs. 17–18. 1985 Polyzygia neodevonica (Matern) ; Casier: tabl. 2.

1985 Polyzygia neodevonica (Matern) ; Lethiers et al.: 76–77, pl. 13, figs. 6–7. 1988 Polyzygia neodevonica (Matern) ; Milhau: 487, pl. 56, fig. 4.

1988 Polyzygia neodevonica (Matern) ; Becker: 407–408, pl. 2, figs. 29–30. 1993 Polyzygia neodevonica (Matern) ; Lethiers & Racheboeuf: 598, pl. 2, figs. 7–8. 1994 Polyzygia neodevonica neodevonica (Matern) ; Gozalo: 100–107, pl. 15, figs. 4–5. 2004 Polyzygia neodevonica (Matern) ; Becker in Becker et al.: 49, pl. 5, fig. 11, pl. 9, figs. 1–3. 2008 a Polyzygia neodevonica (Matern) ; Casier & Olempska: 55, pl. 1; figs. 18–19. 2009 Polyzygia neodevonica (Matern) ; Casier in Casier & Préat: pl. 5, fig. 8. 2010 a Polyzygia devonica (Matern) ; Casier in Casier et al.: 41.

2013 Polyzygia devonica (Matern) ; Casier & Maillet in Casier et al.: 254, 264, fig. 9M. 2013 Polyzygia neodevonica neodevonica (Matern) ; Maillet: 112, pl. XIV, figs. 23–24. 2013b Polyzygia neodevonica (Matern) ; Maillet et al.: fig. 7W.

Material. 135 specimens (45 C, 54 V, 36 F).

Diagnosis. Becker (1971a, p. 45).

Description. Large almost equivalve carapace, sub-oval and slender posteriorly in lateral view. Hmax at 2/5 anterior; Lmax slightly ventral; Wmax anterior. Very arched dorsal margin, strongly oblique both anteriorly and posteriorly from Hmax. Rounded ventral margin, posteriorly oblique. Ventral and dorsal margins converging anteriorly and more especially posteriorly. Well rounded anterior margin. Convex, highly arched posterior margin. Anterior part of the carapace higher than the posterior one. Surface smooth. Longitudinal ventral “W”-shaped sulcus extending from antero-dorsal part to postero-dorsal part. Three vertical sulci below the dorsal margin, one median, one slightly anterior, one slightly posterior. Slight carina along the free margins of the valves.

Discussion. This subspecies, whose morphology is characteristic, is particularly abundant in the Givetian of Asturias. Morphological variation of the carapace was observed, with lobes varying from large and bulbous to very thin and forming tenuous ridges.

Occurrences. Lower Givetian to Lower Frasnian (Huergas Fm and Candás Fm, mbs B, C and D), Asturias (Peran-Perlora, Carranques and Huergas sections), Frasnian (Rodanas Fm), Spain (Tabuenca), Lower to Upper Frasnian (Nismes, Moulin Liénaux, Grand Breux, Valisettes, Lustin, Aisemont and Bovesse Fms), Ardenne (Flohimont, Nismes, Frasnes, Sourd d’Ave, Boussu-en-Fagne, Senzeille, Neuville, Marche, Barvaux, Presles, Engis, Huccorgne, Tournai, Vieux-Leuze sections); Lower Frasnian, Boulonnais; Givetian, Morocco and Saoura; Middle Devonian, Eifel and Ruhr; Lower Devonian and Givetian, Armorican Massif.