Raja stellulata Jordan & Gilbert, 1880

David A. Ebert & Chante D. Davis, 2007, Descriptions of skate egg cases (Chondrichthyes: Rajiformes: Rajoidei) from the eastern North Pacific., Zootaxa 1393, pp. 1-18: 13-14

publication ID

z01393p001

publication LSID

lsid:zoobank.org:pub:0C16005C-21BC-4252-823E-C83515FCFF28

persistent identifier

http://treatment.plazi.org/id/A60D24F7-0E23-0D3A-DC9E-ABA944F28F33

treatment provided by

Thomas

scientific name

Raja stellulata Jordan & Gilbert, 1880
status

 

Raja stellulata Jordan & Gilbert, 1880 

Description: The egg cases of Raja stellulata  (Figure 11) are large, 91 to 92 mm in length, with MAW about 66-70 % of ECL. The egg case is covered with dense fibers on the dorsal surface, thinner on the ventral. The outer fibrous covering appears as an intricately woven sheath with a wool-like texture. Beneath these fibers the egg case is smooth, with very fine longitudinal striations. The LKW is narrow, <10% of ECL, and not extending onto horns. Attachment fibers are present along lateral keels. Anterior apron border broad and concave, anterior horns become flattened towards the tips and hook inwards. Posterior apron nearly straight, broad, transverse, and about 1-2 mm wider than anterior apron width. The posterior horns are about 5 to 6 mm longer than anteriors, curved, conical and tapering, becoming flattened, but without filamentous tips. The tips are hook-shaped at the ends. Color after preservation a uniform brown.

Remarks: The egg case of R. stellulata  has not been previously described. The egg case figured by Cox (1963: figure 5) as this species is actually that of B. trachura  . The egg case of R. rhina  and R. stellulata  are somewhat similar, but can be easily distinguished by the narrower lateral keels present on the latter. Also, the attachment fibers on R. stellulata  extend the length of the lateral keels, while the fibers on R. rhina  egg cases originate midway along lateral keel of egg case.

Material examined: CAS 224344, 73.2 cm TL, off Davenport, California (36.9235 N, - 122.2275 W), 88 m, 16 April 2004. 

CAS

USA, California, San Francisco, California Academy of Sciences

Kingdom

Animalia

Phylum

Chordata

Class

Elasmobranchii

Order

Rajiformes

Family

Rajidae

Genus

Raja