Pseudodrobna natator ( Glaessner, 1945 ) Audo & Winkler & Charbonnier, 2021

Audo, Denis, Winkler, Norbert & Charbonnier, Sylvain, 2021, Pseudodrobna natator n. comb., a new link between crustacean faunas from the Jurassic of Germany and Cretaceous of Lebanon, Geodiversitas 43 (8), pp. 209-218 : 210-212

Pseudodrobna natator ( Glaessner, 1945) n. comb. ( Figs 1 A-H; 2A)

Penaeus natator Glaessner, 1945: 700-702 , fig. 3.

Penaeus libanensis – Roger 1946: 23-26, figs 16-17, pl. 1 fig. 4 not pl. 3 fig. 1 (pro parte).

Drobna sp. I – Roger 1944: 848; 1946: 29-31, fig. 21, pl. 1 fig. 6.

Metapenaeopsis natator – Charbonnier et al. 2017: 69-74, figs 121-141. TYPE MATERIAL. — Holotype NHMUK 59690 (part and counterpart, Fig. 1A ); paratypes NHMUK 59511, In 29563, In 29578 ( Fig. 1B ). As stated byCharbonnier et al. (2017), the original material also included three additional paratypes, now excluded from the type series, and assigned to Palaeobenthonectes arambourgi ( Roger, 1946) (NHMUK 59688, 59689) and Carpopenaeus septemspinatus (Dames, 1886) (NHMUK I 148), respectively.

TYPE LOCALITY. — Sahel Alma, Kesrouane district, Lebanon .

TYPE AGE. — Late Cretaceous, late Santonian, Nannofossil biozone UC13 of Burnett (1998) - UC17 pro parte Sissingh (1977).

DISTRIBUTION. — Santonian ( Lebanon).

ADDITIONAL MATERIAL. — Same as Charbonnier et al. (2017): five specimens MNHN.F.B18859 ( Fig. 2A ) (also figured by Roger 1946: pl. 1, fig. 4), MNHN.F.B18886 (figured by Roger 1946: pl. 1, fig. 6),MNHN.F. A30696 ( Figs 1 F-H), A30697 ( Fig. 1C ), A30702 (Arambourg coll., Fig. 1E ). All are from Sahel Alma.

DESCRIPTION

See Appendix 1.

DISCUSSION

Pseudodrobna natator n. comb. was assigned to Penaeus Fabricius, 1798 without real justification by Glaessner (1945), as it has often been the case for numerous fossils ( Pérez Farfante & Kensley 1997; Charbonnier et al. 2017). Charbonnier et al. (2017) justified the assignment to Penaeidae , mostly by elimination, as, unfortunately, diagnostic characters of Penaeidae are difficult to observe and mostly defined on extant species (see Pérez Farfante & Kensley 1997). Later, Charbonnier et al. (2017), not aware of the work by Winkler (2017), assigned P. natator n. comb. to Metapenaeopsis Bouvier, 1905 based upon the rostrum with only suprarostral teeth ( Fig. 1E ), the epigastric tooth separated from rostral teeth, the marked antennal and pterygostomial spines and pubescent (i.e. covered by setae) exoskeleton ( Fig. 1F ). However, in the light of the work by Winkler (2017), it appears that P. natator n. comb. is more closely allied to Pseudodrobna Winkler, 2017 than Metapenaeopsis : indeed, as Pseudodrobna kenngotti Winkler, 2017 (type species and only species assigned to Pseudodrobna by Winkler 2017 – Fig. 1I, J ), P. natator n. comb. possesses a rather short cephalothoracic shield, almost as long as high in lateral view (vs distinctly longer in Metapenaeopsis ), a rather short, upturned rostrum (vs longer in Metapenaeopsis ). For these reasons, we assign Penaeus natator to Pseudodrobna .

Figures

FIG. 1. — Comparison between Pseudodrobna natator (Glaessner, 1945) n. comb. from the Santonian of Sahel Alma, Lebanon and P. kenngotti Winkler, 2017 from the lower Tithonian of Schernfeld near Eichstätt,Germany:A-H, Pseudodrobna natator: holotype NHMUK 59690, right lateral view, in natural light (A); paratype NHMUK In 29578, dorsal view,in natural light (B); reconstruction (C); specimen MNHN.F.A30697, in cross-polarized light (D); specimen MNHN.F.A30702, left lateral view, detail of the rostrum, in natural light (E); specimen MNHN.F.A30696, right lateral view, detail of the dorsal part of the cephalothoracic shield, in natural light (F), detail of the eye (G) and detail of the scaphocerite (H). I-J, Pseudodrobna kenngotti: holotype SMNS 70355, lateral left view, UV-yellow autofluorescence (I) and specimen from N. Winkler private collection, right lateral view, UV-yellow autofluorescence (J). Abbreviations: P1-P5, pereiopods 1-5 (= thoracopods 4-8). Images: Courtesy Claire Mellish, © NHMUK (A, B), Denis Audo (C, D), Gaëlle Doitteau (E-recolnat) (E-H) and Norbert Winkler (I, J). Scale bars: A, B, D, H, I, 10 mm; E-H, 1 mm.

FIG. 2. — Bilobed eyes of dendrobranchiate shrimps from Sahel Alma: A, bilobed eye of Pseudodrobna natator (Glaessner, 1945) specimen MNHN.F.B18859, right lateral view, natural light; B, bilobed eye of Palaenbenthonectes arambourgi (Roger, 1946), specimen MNHN.F.A30703, natural light; C-E, bilobed eyes of Palaeobenthesicymus libanensis (Brocchi, 1875), specimen MNHN.F.A30607 (C), details of the ommatidia of the anterior lobe of the eye (D) and ommatidia of the posterior lobe of the eye of specimen MNHN.F.A30587 (E) – note that D and E are reproduced at the same scale to ease comparison. Images: Christian Lemzaouda (MNHN) (A), Denis Audo (B) and Marie-Béatrice Forel (C-E). Scale bars: A, B, 1 mm; C, 5 mm; D, E, 0.5 mm.