Pseudocryptochirus viridis Hiro, 1938

Pseudocryptochirus viridis Hiro, 1938 View in CoL

Pseudocryptochirus viridis View in CoL — Van der Meij 2012: tab. 2 [domicile only: citing Scott 1984: pl. 42B].

Taxonomy: Hiro (1938), Utinomi (1944), Kropp

(1988 b 1990), Van der Meij (2012). Type: Whereabouts and status unknown ( Kropp

1988 b 1990). Type locality: Tanabe Bay, Wakayama, Japan. Distribution: West Pacific: South China ( Hong

Kong), Taiwan, Ryukyus, Japan, to Vietnam, Malaysia

(Sabah), Indonesia, Micronesia ( Palau and Guam), Marshall Islands, northeastern Australia, and New Caledonia ( Van der Meij 2012).

Habitat: In domiciles within corals of the Dendrophyllidae : including Turbinaria frondens (Dana, 1846) , T. mesenterina (Lamarck, 1816) , T. cf. patula (Dana, 1846) , T. reniformis Bernard, 1896 and T. stellulata (Lamarck, 1816) ; domicile as shallow, crescent-shaped depression ( Van der Meij 2012).

Remarks: The present species was reported by Van der Meij (2012) based on an image showing a gall crab dwelling on scleractinian coral Turbinaria mesenterina (Lamarck, 1816) shown in Scott (1984). In an email communication, S. Van der Meij (University of Groningen, the Netherlands) kindly confirmed the record, adding a slight possibility that the illustrated dwelling may belong to Neotroglocarcinus dawydoffi (Fize and Serène, 1956) instead of P. viridis (the two species overlap in host records). We follow her original identification for now.

Xynomaia sheni (Fize & Serène, 1956) #

Xynomaia sheni View in CoL species complex — Wong et al. 2023: 26, figs. 4E, F, 5I, J, 14.

Taxonomy: Fize & Serène (1957: as Troglocarcinus (T.) sheni View in CoL ).

Type: Syntypes probably at Institute of Oceanography in Nha Trang, Vietnam; status unknown.

Type locality: Nhatrang, Vietnam.

Distribution: Eastern Indian Ocean to West Pacific: from Thailand (Phuket), Vietnam, South China ( Hong Kong), Malaysia (Sabah), Indonesia, to Mariana Islands and Guam ( Serène 1966; Fize and Serène 1957; Kropp 1990; Ng and Davie 2002; Paulay et al. 2003; Van der Meij and Reijnen 2014; Van der Meij and Nieman 2016; Wong et al. 2023).

Habitat: In domiciles within corals, recorded hosts include Pectinia lactuca (Pallas, 1766) , P. paeonia (Dana, 1846) and Mycedium elephantotus (Pallas, 1766) ( Merulinidae ) and Oxypora lacera (Verrill, 1864) ( Lobophylliidae ) ( Fize and Serène 1957; Kropp 1990; Van der Meij and Reijnen 2014; Van der Meij and Nieman 2016). Local material reported by Wong et al. (2023) was collected from Coelastrea aspera (Verrill, 1866) of the Merulinidae .

Remark s: Given its small size and conservative morphological features, precise identifications of Xynomaia have been difficult. Among relevant groups, molecular data shows material identified as Xynomaia being composite ( Van der Meij and Nieman 2016), whereas local material identified as such comprise of at least two distinct operational taxonomic units (OTUs). This identification remains tentative before possibly extant types and/or topographic material can be examined (see Wong et al. 2023).