THE BURROWING BARNACLES (CIRRIPEDIA: ACROTHORACICA) 149 



Key to the Order Acrothoracica 



la. With an anus, terminal cirri biramous, caudal appendage may be present 



(Suborder Pygophora) 2 



lb. Without an anus or caudal appendage, terminal cirri uniramous (Suborder 



Apygophora, Family Trypetesidae, Genus Trypetesa) 32 



2a. Alimentary canal without gut teeth (gizzard), mouth cirri well developed, 

 labrum of approximately the same size as the rest of well-developed 

 mouthparts, burrow aperture in shell a tapered slit like a typed apostrophe 



(Family Lithoglyptidae) 3 



2b. Alimentary canal with gut teeth (gizzard), mouth cirri atrophied or absent, 

 large attenuated labrum present, mouthparts relatively weak, burrow aper- 

 ture in shell very small and short, almost round. (Family Cryptophialidae) . 4 

 3. Excluding mouth cirri, terminal cirri number in pairs: 



5 plus caudal appendage Weltneria, 16 



5 without caudal appendage Berndtia, 19 



4 plus caudal appendage Lithoglyptes, 21 



4 without caudal appendage Balanodytes taiwanus 



3 plus caudal appendage Kochlorine, Kochlorinopsis, 28 



4a. With 4 pairs of terminal cirri, 1 dorsal body process . . Australophialus, 5 

 4b. With 3 pairs of terminal cirri, 2 dorsal body processes . Cryptophialus, 7 



5a. Opercular margin entire, not notched 6 



5b. Opercular margin with distinct notch at Yz length from attachment end 



Australophialus turbonis 

 6a. Margin with distinct short spines: New Zealand only . . A. melampygos 



6b. Margin with small, bifid teeth; South Africa A. utinomii 



7a. Operculum with 2-6 spines about half as long as apertural length ... 8 

 7b. Operculum with hillocks less than H as high as apertural length, bearing 



niany teeth or thin straight spines 13 



8a. Teeth between spines serrated 9 



8b. No teeth between spines, or if present, not serrated 12 



9a. Spines heavily toothed, with miniature barbed spines between main spines 



Cryptophialus lanceolatus 

 9b. Spines sparsely toothed, without barbed miniature spines between main 



spmes 



10 



10a. With 2 pairs of distinct, haired spines on operculum H 



10b. With 2 gnarled hillocks bearing serrated spines, knobs, and hairs 



C. newmani 

 11a. Lateral bar terminates in area with heavy recurved teeth resembling a claw 



C. unguiculus 



lib. Lateral bar without terminal array of teeth C. variabilis 



12a. Circlet of teeth distributed around posterior end of left lateral bar, apertural 



spines heavy (about 3 times as long as wide) C. coronatus 



12b. Lateral bars pointed posteriorly, without circlet of teeth, apertural spines 



light, about 5 times as long as wide C. longicollatus 



13a. Operculum armed with bunches of thin, straight spines . . C. cordylacis 



13b. Operculum armed with teeth, which are conical or curved 14 



14a. Opercular teeth essentially uniform and conical in shape 15 



14b. Operculum with low, conical, toothed hillocks and curved, bifid, blunt teeth 



C. wainwrighti 



