taxonID	type	description	language	source
03ED1D20FF81FFC0439DF9A420B8A0FB.taxon	description	Figure 2	en	Oviedo, Loreley, Pastorino, Guido (2023): Description of the early shell morphology of three species of Pectinidae (Mollusca: Bivalvia) from Argentina. Zootaxa 5361 (3): 427-443, DOI: 10.11646/zootaxa.5361.3.8, URL: https://www.mapress.com/zt/article/download/zootaxa.5361.3.8/52200
03ED1D20FF8DFFCC439DFDA0224BA0D3.taxon	description	Figure 3	en	Oviedo, Loreley, Pastorino, Guido (2023): Description of the early shell morphology of three species of Pectinidae (Mollusca: Bivalvia) from Argentina. Zootaxa 5361 (3): 427-443, DOI: 10.11646/zootaxa.5361.3.8, URL: https://www.mapress.com/zt/article/download/zootaxa.5361.3.8/52200
03ED1D20FF8DFFCC439DFDA0224BA0D3.taxon	discussion	Prodissoconch The Prodissoconch- 1 has a faint radial striation, without distinct commarginal growth lines, mean length is 81 µm (n = 2). The Prodissoconch- 2 has thin commarginal growth lines, mean length of the P- 2 is 197 µm (n = 2), and P- 1 / P- 2 length ratio is 0.41 (n = 2) (Table 3, Fig. 3 F). Nepioconch The microsculpture of the LV is fine and presents regularly and densely distributed pits (Fig. 3 A, C, E). The mean height of the LV is 1.97 mm (n = 2) and the height of the prismatic stage of RV is 1.93 mm (n = 2) (Table 4). The ctenolium develops during the prismatic stage; the AA has an auricle prismatic stage. The byssal notch (RV) is deep, the byssal sinus (LV) still incipient. Post-nepioconch Ribs begin to develop rather early underlying the pitted and prismatic layer, respectively. The left valve has 28 to 34 faint folds (n = 2), with primary and secondary ribs being difficult to distinguish; there are no scales (Fig. 3 A, B, C). The microsculpture of the fold interspaces morphs into elongate pits that, towards the shell edge, become fine antimarginal ridges and gutters (Fig. 3 C). The posterior and anterior auricles of the LV, and the posterior auricle of the RV show similar microsculpture patterns, interrupted by prominent growth ridges. The posterior auricle is slightly longer than the anterior one (ratio AA / PA = 0.92) (Table 4). The free margin of posterior auricles is straight whereas the one in the anterior auricle is anteriorly inclined. Two well defined ribs start from the ‘ auricle prismatic stage’ of the anterior auricle (n = 2) (Fig. 3 D). The byssal notch becomes sinuous and the byssal sinus is more conspicuous than in the nepioconch. The active ctenolium presents three to four teeth (n = 2) (Table 4). The umbonal angle is obtuse (α = 100 º) (n = 2) (Table 4). The shell can be white or light yellow in color.	en	Oviedo, Loreley, Pastorino, Guido (2023): Description of the early shell morphology of three species of Pectinidae (Mollusca: Bivalvia) from Argentina. Zootaxa 5361 (3): 427-443, DOI: 10.11646/zootaxa.5361.3.8, URL: https://www.mapress.com/zt/article/download/zootaxa.5361.3.8/52200
03ED1D20FF8DFFCF439DF90B2433A5B0.taxon	description	Figure 4	en	Oviedo, Loreley, Pastorino, Guido (2023): Description of the early shell morphology of three species of Pectinidae (Mollusca: Bivalvia) from Argentina. Zootaxa 5361 (3): 427-443, DOI: 10.11646/zootaxa.5361.3.8, URL: https://www.mapress.com/zt/article/download/zootaxa.5361.3.8/52200
03ED1D20FF8DFFCF439DF90B2433A5B0.taxon	discussion	Prodissoconch In the single specimen examined by scanning electron microscopy, the microsculpture of the P- 1 could not be determined. Prodissoconch- 2 presents commarginal growth lines (Fig. 4 F). The lengths of P- 1 and P- 2 are 86 µm and 256 µm, respectively (n = 1), the P- 1 / P- 2 ratio is 0.33 (Table 3). Nepioconch The microsculpture of the LV shows antimarginal riblets that are widening when these are crossed by thin commarginal growth (Fig. 4 C, E). This pattern extends onto both the anterior and posterior auricles (Fig. 4 A, B). The mean height is 2.3 mm (sd = 0.25, n = 6), the mean height of the prismatic stage of the right valve is 1.3 mm (sd = 0.20, n = 6). A radial row of protuberances accompanies the growth of the auricle prismatic stage and extends along the anterior auricle of the right valve (Fig. 4 D). The byssal notch is deep and wide. Post-nepioconch The nepioconch microstructure continues throughout this entire stage only that it becomes interrupted first by primary and then secondary ribs, together around 21 to 31 (mode = 28, n = 6) (Table 4). Where ribs meet commarginal growth steps, they become nodular; these nodules are best developed on the disc flanks and are more conspicuous on the LV than RV (Fig. 4 A, B). The riblet-and-gutter microsculpture fills only the interspaces not crossing the ribs; they do become more pronouncedly antimarginal-like and also divergent. On the disc flanks, they meet the shell margin at a rather oblique angle. The sculpture is less conspicuous on the central disc. It is also present on both LV auricles and the posterior one of the RV. The anterior auricle is slightly longer than the posterior one, giving an AA / PA ratio of 1.33 (n = 6) (Table 4). The free margins of the posterior auricles can be slightly anteriorly inclined and the free margins of the anterior auricle of LV is straight or inclined slightly toward anterior. The byssal notch is as wide as in the previous stage, and the active ctenolium presents two or three free hooked teeth (mode = 3; n = 6) (Fig. 4 D). The mean umbonal angle is 89 ° (n = 6). (Table 4). Shell color is orange under natural light but less intense on the RV.	en	Oviedo, Loreley, Pastorino, Guido (2023): Description of the early shell morphology of three species of Pectinidae (Mollusca: Bivalvia) from Argentina. Zootaxa 5361 (3): 427-443, DOI: 10.11646/zootaxa.5361.3.8, URL: https://www.mapress.com/zt/article/download/zootaxa.5361.3.8/52200
