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Table 3 Differences between the new species of Falcidens and the known Mediterranean and Atlantic species

From: Four new species of Chaetodermatidae (Mollusca, Caudofoveata) from bathyal bottoms of the NW Iberian Peninsula

Species References No. of body regions Anterior Neck Trunk/Tail Tassel Radula
Falcidens aequabilis Salvini-Plawen, 1972 [19] 5 Lanceolate and elongated Lanceolate, waist and median keel Sagittal, base with notch and median keel
Sagittal, base with notch and several crests
Acicular One pair of supports
Falcidens crossotus Salvini-Plawen, 1968 [18, 20, 21] 5 Oval with two crests. Sagittal, median keel and several lateral Lanceolate and elongated with medial keel Acicular. Lanceolate with median groove One pair of supports
Falcidens gutturosus (Kowalevsky, 1901) [6, 17, 19] 5 Lanceolate Sagittal, with notch, median keel and lateral crests Lanceolate, notched, waist, median keel and several crests Acicular Two pairs of supports
Falcidens sagittiferus Salvini-Plawen, 1968 [18, 20, 21] 4 Oval Lanceolate with waist, only median keel and base with notch Lanceolate with median keel Acicular One pair of supports
Falcidens sterreri (Salvini-Plawen, 1967) [18, 22] 4 Lanceolate Lanceolate, notched and median keel Lanceolate with several crests Acicular One pair of supports
Falcidens strigisquamatus (Salvini-Plawen, 1977) [8, 17] 4 Sagittal Sagittal with many striations Lanceolate with several crests Lanceolate with median groove One pair of supports
Falcidens vasconiensis Salvini-Plawen, 1996 [10, 12, 34, 35] 5 Oval with two grooves Sagittal, with median keel and several lateral crests Lanceolate, waist, median keel and lateral keels Acicular smooth or with one or two grooves Two pairs of supports
Falcidens valdubrensis sp. nov.   4 Oval Sagittal with median keel. Sagittal, median keel and two lateral grooves. Sagittal with small median keel Lanceolate, waist and median keel. Lanceolate, wide and median keel. Lanceolate, median keel and lateral grooves, round and truncated base Lanceolate with median keel. Lanceolate, elongated blade, median keel and lateral grooves Unknown
Falcidens garcialvarezi sp. nov.   4 Oval
Oval, median keel
Oval, median keel. Lanceolate, waist, median keel and lateral grooves, base with notch and wings Lanceolate, median keel, lateral grooves and base with and without notch Lanceolate with median groove. Spatulate, truncated base, narrower than blade, with median groove. Acicular, one or two grooves One pair of supports and central plate
Falcidens urgorrii sp. nov.   4 Oval Sagittal Lanceolate, median keel, two lateral grooves and three types of bases Lanceolate with median groove on the base. Lanceolate with median groove. Acicular, wide base with medial groove Two pairs of supports