Brain architecture of the largest living land arthropod, the Giant Robber Crab Birgus latro (Crustacea, Anomura, Coenobitidae): evidence for a prominent central olfactory pathway?

Table 2 Morphometric comparative table

Taxon	Species	ON neuropil volume (μm³)	Glomerular volume (μm³)	Glomerular number	Aesthetasc count	Convergence ratio (aesthetasc/glomeruli)
Achelata	Panulirus interruptus	344,922,004	287,884	1,202	1,786	1.486
	Panulirus argus	154,068,687	117,862	1,332	1,255	0.942
	Jasus edwardsii	591,956,438	616,475	961	1,537	1.599
Homarida	Homarus americanus	141,159,589	591,583	249	1,262	5.068
Astacida	Cherax destructor	24,187,019	110,975	230	130	0.565
	Cherax quadricarinatus	24,735,814	74,298	334	237	0.710
	Procambarus clarkii	9,790,377	19,585	503	133	0.264
Thalassinida	Callianassa australiensis	6,588,788	28,041	235	22	0.094
Anomura	Coenobita clypeatus	120,352,292	153,833	799	519	0.650
	*Birgus latro*	374,681,700	280,103	1,338	*(780) 1700**	*(0.58) 1.27**
	Petrolisthes coccnicus	12,359,013	18,947	655	328	0.501
Brachyura	Cancer borealis	165,730,818	229,666	733	540	0.737
	Libinia dubia	20,327,317	39,338	454	319	0.703
	Percnon planissimum	28,765,244	58,705	495	555	1.121
	Sesarma sp.	6,617,077	14,887	446	33	0.074
	Uca minax	4,558,497	17,779	284	39	0.137
	Uca pugilator	3,114,604	13,14	234	28	0.120
	Uca pugnax	3,012,080	8,034	374	26	0.070

Means of olfactory neuropil volume, glomerular volume, calculated glomerular number, aesthetasc count and the convergence ratio per hemi-brain adopted from Beltz et al. 2003 [44] except B. latro. (*aesthetasc count adopted from Harms, 1932 [7]).

ISSN: 1742-9994