Table 3 Differences between the new species of Falcidens and the known Mediterranean and Atlantic species
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 | 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) | 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 | 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) | 4 | Lanceolate | Lanceolate, notched and median keel | Lanceolate with several crests | Acicular | One pair of supports | |
Falcidens strigisquamatus (Salvini-Plawen, 1977) | 4 | Sagittal | Sagittal with many striations | Lanceolate with several crests | Lanceolate with median groove | One pair of supports | |
Falcidens vasconiensis Salvini-Plawen, 1996 | 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 |