Harris: The copepod genus Porcellidium 
109 
Appendices 
Appendix 1. Identity of specimens in the Norman slide collection Natural History Museum, London (339 Porcellidiidae). 
Twenty microscope slides of specimens collected by A. M. Norman over a period from 1861 to 1906 are of interest because 
they contain type specimens of his Porcellidium subrotundum and reflect the nomenclature of that period. Unfortunately 
identification is difficult because the slides are in very poor condition, but several of the specimens can be positively 
identified. Norman based his identifications on Claus’ 1863 description of P. fimbriatum. The following criteria have been 
used to separate the species 
Porcellidium viride 
body shape LAV <1.5 
caudal ramus 1/w <2.2 
M 1 /M 2 < 0.9 (where Mi = a to (3, M 2 = (3 to y); diatoms usually present 
Porcellidium fimbriatum 
body shape LAV >1.7 
caudal ramus 1/w >2.7 
M 1 /M 2 > 2.5 
reg. number 
label 
identification 
1951.8.10.892 
Porcellidium tenuicauda. Washed off dredged 
weed, Ventry Bay. 1 $ 
P. fimbriatum 1 S- 
Porcelloides tenuicaudus. 
Porcellidium viride. CR. l/w= 1.9. 
1951.8.10.894 
P. tenuicauda Claus. In bulb of 
Laminaria bulbosa Roundstone, 1865. 
Porcelloides tenuicaudus. 
M2609 
P. tenuicauda Claus. Gumsey. 
Porcelloides tenuicaudus. 
M2566 
P. lecanoides Claus. Plymouth, 1889. 
Porcellidium fimbriatum. CR. 1/w = 2.7: terminal 
setae pinnate, genital double- somite cleft. 
1900.3.6.706 
P. fimbriatum Claus. = viride Phil? 
Shetland, 1861. 
Porcellidium viride, 3 Covered in diatoms. 
L/W 1.3; 1/w 1.6; M 1 /M 2 = 0.8. 
M2565 
P. fimbriatum Claus. Hillswick, Shetland, 1867. 
Poor slide. Diatoms++. Probably Porcellidium viride. 
M2613 
P fimbriatum Claus. Hillswick, Shetland, 1867. 
Porcellidium viride (males). Male with purple patch 
on cephalosome. Many male copepodids. 
M2614 
P. fimbriatum Claus. Male dentatum + junior; 
Hillswick, Shetland, 1867. 
Porcellidium viride (copepodids). 
1900.3.6.707 
P. fimbriatum Claus. 1 S and 3 $ $ 
Tidemarks. Oban, 1877. 
Porcellidium viride. Poor slide, diatoms ++ 
M2611 
P. fimbriatum Claus. Male P. dentatum Cl. 
Oban, 1877. 
Porcellidium viride. (5 poor ^ $ and copepodids). 
Diatoms++, M 1 /M 2 = 0.88, CR. 1/w = 2.0. 
M2612 
P. fimbriatum Claus. Oban, 1877. 
Males. Poor slide, probably Porcellidium viride. 
M2564 
P. fimbriatum Claus. Firth of Clyde, 1862. 
Porcellidium viride. Diatoms ++, M 1 /M 2 = 0.57, 0.68. 
M2610 
P. fimbriatum Claus = ? viride. 
Catwater, Plymouth, 1889. 
Probably Porcellidium viride. Male covered 
in diatoms. 
M2615 
P. fimbriatum Claus. Rock pools, 
Plymouth, 1889. 
Two females, poor specimens with diatoms. 
Probably Porcellidium viride. 
1900.3.6.708 
P. fimbriatum Claus. Males and females. 
Tobermory, Mull, 1866. 
All Porcellidium viride. Diatoms ++ 
1900.3.6.709 
P. fimbriatum Claus. Males. Floro, Norway, 1882. Poor slide. Mostly copepodids of Porcellidium viride. 
M2608 
P. lecanoides Claus. Guernsey, 1906. 
Porcellidium viride. 
M2607 
P. subrotundum. Norman types = 
P. fimbriatum junior. Hillswick, Shetland, 1867. 
Seven copepodids, some with patch of purple on 
posterior cephalosome. All appear to 
be Porcellidium viride. 
1951.8.10.893 
P. subrotundum and P. dentatum. On Laminaria. 
Hillswick, Shetland. 
All copepodids of Porcellidium viride. 
