Calcinus morgani Rahayu & Forest 1999

Fig. 2f

Material. 1 specimen (UF 5720), Rota Island, station ROT-05 ; 3 specimens (UF 5785), Rota Island, station ROT-05 ; 1 specimen (UF 5784), Aguijan Island, station AGU-02 ; 1 specimen (UF 6360), Saipan Island, station NM-04 ; 1 specimen (UF 5719), Saipan Island, station NM-04 ; 1 specimen (UF 5794), Saipan Island, station NM-05 ; 6 specimens (UF 5703), Saipan Island, station NM-04 ; 1 specimen (UF 5787), Anatahan Island, station ANA-003 ; 1 specimen (SIO-BIC C14259), Sarigan Island, station AKM-SAR-02 ; 3 specimens (UF 5791), Guguan Island, station GUG-001 ; 1 specimen (UF 5715), Guguan Island, station GUG-002 ; 1 specimen (UF 5717), Alamagan Island, station ALA-002 ; 3 specimens (UF 5790), Alamagan Island, station ALA-002 ; 1 specimen (UF 5721), Alamagan Island, station ALA-003 ; 2 specimens (SIO-BIC C14240), Alamagan Island, station AKM-ALA-01 ; 1 specimen (UF 5792), Pagan Island, station PAG-03 ; 1 specimen (SIO-BIC C14215), Pagan Island, station AKM-PAG-01 ; 1 specimen (SIO-BIC C14218), Pagan Island, station AKM-PAG-02 ; 3 specimens (SIO-BIC C14222), Pagan Island, station AKM-PAG-03 ; 1 specimen (SIO-BIC C14234), Pagan Island, station AKM-PAG-PA1 ; 1 specimen (SIO-BIC C14236), Pagan Island, station AKM-PAG-PA4 ; 1 specimen (UF 5788), Agrihan Island, station AGR-01 ; 1 specimen (SIO-BIC C14208), Agrihan Island, station AKM-AGR-00A3 ; 5 specimens (UF 5793), Maug Islands, station MAUG-03 ; 1 specimen (UF 7439), Maug Islands, station MAUG-04 ; 1 specimen (UF 5795), Maug Islands, station MAUG-04 ; 2 specimens (UF 5789), Maug Islands, station MAUG-10 ; 2 specimens (UF 5786), Supply Reef, station SUP-01 ; 1 specimen (SIO-BIC C14195), Maug Islands, no station info ; 1 specimen (SIO-BIC C14196), Maug Islands, no station info .

Remarks. Komai (2004) demonstrated that Calcinus areolatus Rahayu & Forest 1999 was confounded with juvenile or young specimens of C. morgani . Additionally, C. morgani was formerly confused with the very similar C. gaimardii . The latter has not been found in the Marianas. Calcinus morgani is found in wave-exposed intertidal rocky shored and coral reefs, while C. gaimardii prefers calm, subtidal lagoonal waters (Asakura 2002). See Rahayu & Forest (1999) and Asakura (2002) for how to distinguish between the two species.