Echinocyamus pusillus (O.F. Müller, 1776 )

García-Guillén, Laura M., Saucède, Thomas, Ríos, Pilar & Manjón-Cabeza, M. Eugenia, 2025, Deep-sea Echinoids from the Galician Bank (North Atlantic Ocean), Zootaxa 5601 (1), pp. 169-180 : 174

Echinocyamus pusillus (O.F. Müller, 1776) . AphialD: 124273 ( Fig. 2 c–d ).

Material examined. One preserved specimen with catalogue number (station included):124273-B42 (B11DR3).

Description. Test small and fragile test, up to 12 mm long. Genital and ocular plates fused, with four gonopores ( Fig. 2c ). Ocular pores smaller than gonopores. Only one hydropore on the apical system. Petals distinct and open distally. Periproct very small, located halfway between peristome and posterior margin of test ( Fig. 2d ). Oral side slightly depressed around peristome ( Fig. 2d ).

Distribution. Atlantic Ocean: south of Svalbard, Norwegian Sea, North Sea, west of Iceland, United Kingdom, English Channel, Ireland, Bay of Biscay, west and north Galicia, Azores, south of Portugal, west Africa, Mediterranean Sea (O.F. Müller, 1776; Mortensen, 1927; Schultz, 2005; Kroh, & Mooi, 2022; OBIS, 2022)

Bathymetrical range. 0 m ( Mortensen, 1903)– 1250 m ( Mortensen, 1927). Present study: 1313 m.

Remarks. See above for E. grandiporus .

Figures

FIGURE 2. Specimen ECUMA 124270-B39 of Echinocyamus grandiporus: a. Aboral view. Scale bar: 2.5 mm. b. Oral view. Scale Bar: 2.5 mm. Specimen ECUMA 124273-B42 of Echinocyamus pusillus: c. Aboral view. Scale bar: 2.5 mm. d. Oral view. Scale bar: 2.5 mm. Map. Distribution range of E. grandiporus (yellow area; yellow dot for the Galician Bank), E. pusillus (blue area) and E. macrostomus (pink area).