Rajidae

M. A. Treloar, L. J. B. Laurenson & J. D. Stevens, 2006, Descriptions of rajid egg cases from southeastern Australian waters., Zootaxa 1231, pp. 53-68: 57

publication ID

z01231p053

publication LSID

lsid:zoobank.org:pub:DF293AC9-4368-4381-9FA2-F4486715FF80

persistent identifier

http://treatment.plazi.org/id/7E330DA7-0382-B162-5C96-1A2F211D3592

treatment provided by

Thomas

scientific name

Rajidae
status

 

[[ Family Rajidae  ]]

Identification key for rajid egg cases collected from skates in southeastern Australian waters

1a Egg case small, ≤ 85 mm BL ........................................................................................ 2

1b Egg case medium to large, ≥ 90 mm BL ....................................................................... 5

2a Lateral keel absent; dorsal and/or ventral surfaces of egg case covered with dense fibroids .......................................................................................................................... 3

2b Lateral keel present; dorsal and ventral surfaces of egg case not covered with dense fibroids ....................................................................................... Dipturus sp. A  (Fig. 3)

3a Posterior horns shorter than body width; egg case> 40 mm BL .................................. 4

3b Posterior horns at least 2.7 times maximum body width; egg case ≤ 40 mm BL ......... ................................................................................................. Pavoraja nitida  (Fig. 10)

4a Ventral surface of egg case covered with dense fibroids; egg case narrow at posterior end; posterior apron 1.5 times length of anterior apron ............. Dipturus cerva  (Fig. 6)

4b Ventral surface of egg case not covered with dense fibroids; posterior apron length almost 3 times the length of anterior apron .......................... Dipturus lemprieri  (Fig. 8)

5a Dorsal and ventral surfaces of egg case covered with dense fibroids; posterior horns shorter than body width ................................................................................................. 6

5b Dorsal and ventral surfaces of egg case not covered with dense fibroids; posterior horns at least 1.4 times maximum body width ........... Amblyraja cf hyperborea  (Fig. 2)

6a Lateral keel prominent,> 18% of maximum body width; aprons fringed ...................... ................................................................................................ Dipturus whitleyi  (Fig. 9)

6b Lateral keel discrete, <14% of maximum body width; aprons not fringed .................. 7

7a Egg case large, ≥ 160 mm BL; posterior horns enclosed in apron .................................. ............................................................................................ Dipturus cf gudgeri  (Fig. 7)

7b Egg case medium, ≤ 120 mm BL; posterior horns extending out of apron .................... ..................................................................................................... Dipturus sp. B  (Fig. 4)

Note: Dipturus sp. L  was not included in this key as only partially formed egg cases were examined.