taxonID	type	description	language	source
2549A250A833FFAE15A209BEEA0234B8.taxon	description	The casted burrows of M. depressus were complex, with multiple entrances and branches (Figures 2 and 3). In fact, we never managed to make a complete cast of an entire burrow as the tunnels always continued after where the plaster stopped. One burrow appeared to have five entrances and another had two entrances (the 10 burrow entrances into which plaster was poured ultimately proved to belong to five burrows). Branches were observed leading in every direction and tunnels had various slopes and angles. The maximum depth of a cast was 35 cm, at which the water level was reached. In two casted burrows a single crab was found. In the three other burrows the crabs were probably able to escape, as the burrows were more extensive than our casts. The 16 excavated burrows were similarly complex as the casted burrows. In six of the 16 excavated burrows more than one crab per burrow was encountered (up to four crabs per burrow; Figure 4). In total 27 crabs were captured, of which we identified seven as males and eight as females. Sex could not be convincingly determined in 12 smaller individuals. There was no relationship between burrow size at entrance and crab size (t = 1.109, P = 0.28, R 2 = 0.01; Figure 4).	en	Bom, Roeland A., Ebbinge, Maaike (2022): Simple and complex burrow morphology in two Macrophthalmus species on the intertidal mudflats of Barr Al Hikman, Sultanate of Oman. Journal of Natural History 56 (5 - 8): 475-485, DOI: 10.1080/00222933.2022.2093679, URL: http://dx.doi.org/10.1080/00222933.2022.2093679
2549A250A833FFAF15A20BAAED543265.taxon	description	All casted and excavated burrows of M. sulcatus were single tunnelled (Figure 3). The casted burrows showed one or two sharp curves at the beginning, with no specific direction, after which the tunnel continued in one direction. The end of each burrow consisted of a small pool of water in which, in all but one cast, a single crab was entombed by the plaster. The mean length of the casted burrows was 21.3 cm (Standard Deviation [SD] ± 5.2; range 11.2 – 26.6 cm) and the mean depth was 10.3 cm (SD ± 1.5; range 8.3 – 12.5 cm). In one of the casted burrows two relatively large crabs were found: a male and a female (Figure 4). In total 24 crabs were entombed or captured, of which we identified 13 as males and 11 as females. There was a positive relation between burrow size at entrance and the carapace width of the crab caught inside (t = 8.972, P <0.01, R 2 = 0.79; Figure 4). The regression equation was Y ¼ 4: 51 þ 1: 16 X.	en	Bom, Roeland A., Ebbinge, Maaike (2022): Simple and complex burrow morphology in two Macrophthalmus species on the intertidal mudflats of Barr Al Hikman, Sultanate of Oman. Journal of Natural History 56 (5 - 8): 475-485, DOI: 10.1080/00222933.2022.2093679, URL: http://dx.doi.org/10.1080/00222933.2022.2093679
