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Cryptic species are two or more distinct but morphologically similar species that …

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- Cryptic animal species are homogeneously distributed among taxa and biogeographical regions

Table 1

Results of database search in Zoological Record™ (1978–2006) for several metazoan taxa. CSR = cryptic species reports.
Taxon	N CSR	N articles	N species

Arthropoda
Insecta	996	219,754	950,000
Crustacaea	137	45,669	52,000
Arachnida	53	31,186	73,000
Other Arthropoda classes	20	885	13,000
Chordata
Mammalia	267	92,592	5,416
Amphibia	92	20,243	5,743
"Reptilia"	58	33,130	8,163
Aves	94	69,899	9,917
"Fishes"	151	97,405	28,500
other Chordata classes	6	2,325	3,025
Mollusca
Cephalopoda	6	7,791	768
Bivalvia	28	17,560	30,000
Gastropoda	86	27,794	75,000
Other Mollusca classes	1	5,407	1,950
Nematoda	66	22,679	20,000
Plathyhelminthes	42	18,040	25,000
Annelida	49	10,646	15,000
Echinodermata	25	8,760	7,000
Porifera	15	3,906	5,000
Other Metazoan phyla	43	58,593	20,395
Pfenninger et al. BMC Evolutionary Biology 2007 7:121 doi:10.1186/1471-2148-7-121

Results of database search in Zoological Record™ (1978–2006) for biogeographical regions. CSR = cryptic species reports.
Region	N CSR	N articles	% species

Neotropis	177	49,637	41.51
Afrotropis	148	30,705	22.18
Indomalayan	115	45,651	11.97
Nearctis	268	71,638	3.16
Palaearctis	447	213,501	5.38
Australasia + Oceania	184	38,711	15.78
Antarctis	15	5,813	0.02
Pfenninger et al. BMC Evolutionary Biology 2007 7:121 doi:10.1186/1471-2148-7-121

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