Calcinus hazletti Haig & McLaughlin 1984

Celia, Maria, Malay, D., Miller, Allison K. & Komai, Tomoyuki, 2021, Hermit crabs (Crustacea: Decapoda: Anomura: Paguroidea) of the Northern Marianas, including new records and an updated checklist, Micronesica 2021 (1), pp. 1-29 : 4-5

Calcinus hazletti Haig & McLaughlin 1984

Fig. 2c

Material. 1 juvenile, shield length (SL) 1.58 mm ( UF 7075 ), Saipan Island , station NM-05 [identification tentative] ; 2 specimens ( UF 7076 ), Sarigan Island , station SAR-002 ; 2 specimens ( UF 5739 ), Alamagan Island , station ALA-003 ; 2 specimens ( UF 5736 ), Pagan Island , station PAG-01 ; 1 specimen ( UF 5732 ), Pagan Island , station PAG-07 ; 1 specimen ( UF 5729 ), Agrihan Island , station AGR-02 ; 2 specimens ( UF 5738 ), Agrihan Island , station AGR-04 ; 4 specimens ( UF 5741 ), Asuncion Island , station ASU-02 ; 3 specimens ( UF 5731 ), Asuncion Island , station ASU-03 ; 1 specimen ( UF 5733 ), Maug Islands , station MAUG-01 ; 5 specimens ( UF 5740 ), Maug Islands , station MAUG-02 ; 4 specimens ( UF 5730 ), Maug Islands , station MAUG-02 ; 1 specimen ( UF 7074 ), Maug Islands , station MAUG-03 ; 1 specimen ( UF 5735 ), Maug Islands , station MAUG-04 ; 1 specimen ( UF 5734 ), Maug Islands , station MAUG-06 ; 3 specimens ( UF 5737 ), Maug Islands , station MAUG-06 ; 2 specimens ( UF 5725 ), Maug Islands , station MAUG-10 ; 3 specimens ( UF 5726 ), Maug Islands , station MAUG-11 ; 1 specimen ( UF 5727 ), Stingray Shoal station STI-001 ; 1 specimen ( UF 5723 ), Stingray Shoal , station STI-002 ; 1 specimen ( UF 5728 ), Uracas Island , station URA-002 .

Remarks. Common in the intertidal area of the Northern Marianas. There is one questionable record from Saipan (UF 7075), however it is a juvenile and cannot be identified with confidence. Even if UF 7075 is indeed C. hazletti , the species is exceedingly rare in the Southern Marianas. This species is otherwise only known from Hawaii and Japan ( Haig & McLaughlin 1984; Asakura & Tachikawa 2003; Arima 2004). However, the Northern Mariana population is genetically distinct from the Hawaiian population ( Malay & Paulay 2010). Given the genetic evidence and disjunct distribution, it is possible that the Northern Marianas and Japanese form represents a cryptic species.

Figures

Fig 2. A: Aniculus aniculus (Olivier, 1812), Pagan Island (SIO-BIC C14220). B: Calcinus elegans (H. Milne Edwards, 1836), Alamagan Island (SIO-BIC C14219). C: Calcinus hazletti Haig and McLaughlin, 1984, photo not associated with specimen. D: Calcinus laevimanus (Randall, 1840), Saipan Island (SIO-BIC C14214). E: Calcinus latens (Randall, 1840), Pagan Island (SIO-BIC C14216). F: Calcinus morgani Rahayu and Forest, 1999, Pagan Island (SIO-BIC C14234).