Lithoglyptes hirsutus (Cirripedia: Acrothoracica), 
A New Burrowing Barnacle from Hawaii 
Jack T. Tomlinson 1 
Two samples of coral from Kaneohe Bay, 
Oahu, Hawaii, have each yielded a number 
of specimens of a new species of acrothoracican 
burrowing barnacle of the family Lithoglypti- 
dae. Samples of Psammocora v err m m Vaughan 
collected by Stephen A. Wainwright, 2 and of 
Porites compressa Dana collected by Charles 
Stasek, 3 were referred to me by William A, 
Newman. 3 These barnacles are the first repre- 
sentatives of the order Acrothoracica known 
from Hawaii. 
Family LITHOGLYPTIDAE Aurivillius 1892 
Lithoglyptidae emend. Tomlinson and New- 
man I960. 
Mouth cirri well developed, on a 2-jointed 
pedicle; 4-5 pairs of terminal cirri, but if only 
4 pairs, caudal appendage present; no gut teeth 
or gizzard in digestive tract; with adhesive disc 
on mantle; lateral bar absent; burrows in coral 
or mollusc hard parts. 
Lithoglyptes Aurivillius 1892 {emend.) 
Four pairs of terminal cirri on a 2-jointed 
pedicle with oblique sutures at first joints; cau- 
dal appendage present; mouth cirrus with 2 
rami of 3 to 6 articles (5 to 6 in original 
description ) . 
Lithoglyptes hirsutus n. sp. 
DIAGNOSIS: Female (Figs. 1-7): Mantle 
aperture strongly arched on both sides of an 
acute projecting tip which is not a movable 
1 Biology Department, San Francisco State College, 
San Francisco 27, California. Manuscript received 
December 19, 1961. 
2 Zoology Department, University of California, 
Berkeley 4, California. 
3 Scripps Institution of Oceanography, La Jolla, 
California. 
spine or hook; aperture length exceeds Vi of 
mantle width, aperture armed with numerous 
teeth and long flexible hairs, especially on the 
outer edge of the lip area; anterior and pos- 
terior rami of mouth cirri with 5 and 3 articles, 
respectively; caudal appendage with 2 seg- 
ments; head with acute projection opposite 
mouth area; burrow pointed oval in surface 
view. Holotype 1.2 X 0-67 mm; about 30 dried 
specimens in Psammocora verrilli from a depth 
of 3-6 ft on Sand Bar Reef and in Porites com- 
pressa from NE side Checker Reef, Kaneohe 
Bay, Oahu, Hawaii. The species is named for 
the presence of numerous hairs on the mantle 
aperture. 
TYPE MATERIAL: Holotype USNM 107544. 
Paratype material: San Francisco State College, 
San Francisco, California; California Academy 
of Sciences, San Francisco, California; Plymouth 
Laboratory, England; Seto Marine Biological 
Laboratory, Japan; Portobello Marine Station, 
New Zealand. 
DESCRIPTION: Female: The mantles of 16 
adults averaged 1.95 mm in height x 1.18 
mm in width (maximum 2.1 mm and 1.6 mm), 
and are flattened laterally. The mantle is studded 
with numerous small T-shaped teeth, short 
spinules, and three- or four-pointed star-shaped 
teeth, all scattered about on the surface, but 
particularly near the aperture. The mantle at- 
tachment disc adheres strongly to the burrow, 
but is readily removed if the coral is decalcified. 
The average length of the slitlike aperture 
of 12 specimens is 0.97 mm. Near the anterior 
end of the aperture two acute projections ex- 
tend to a point, but are not movable or hooked. 
The outer edges of the thickened apertural 
area are heavily set with teeth and long hairs. 
The inner edges have fewer teeth and hairs, 
but have a row of comblike projections which 
extend into the aperture and tend to occlude 
it. This structure has been called the "comb- 
collar” by previous workers. 
299 
