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106 JOURNAL OF CRUSTACEAN BIOLOGY, VOL. 2, NO. I, 1982
broad, ridged crushing plates. Pereopods subequal, stout, with accessory unguis
short, smoothly rounded. Exopod of pleopod 3 with articulation.
Adult Male.—Penes short, stout, separate to base. Appendix masculina arising
from internoproximal angle of endopod of pleopod 2 and extending beyond apex
of endopod. Posterior margin of pereonite 7 markedly bilobed in dorsal view.
Ovigerous Female.—Inadequately known.
Type-species.—Dynamenopsis obtusa Baker, 1908.
Recommendation
based on
Additional species: Current name: examination of:
D. varicolor Hurley and Jansen,
1971 Dynamenopsis varicolor Type
Remarks.—Originally described from South Australia, D. obtusa is here recorded
from Western Australia (see Appendix). In addition, a female Dynamenopsis sp.
is illustrated (Fig. 8k-o). This female differs in dorsal view from males of both
D. obtusa and D. varicolor but as little is known about the degree of sexual
dimorphism shown by species of Dynamenopsis, and since the female was not
found with males, specific identification remains undetermined. At the base of
each of pereopods 2 to 4 this female bears a short, narrow, rigid oostegite, with
indications of four pairs of apertures beneath the ventral cuticle between these
structures. This specimen is apparently nonovigerous.
Of the other species currently placed in the genus Dynamenopsis, D. dumerilii
and D. platura have been placed in Dynamenella above; D. angolensis Kensley,
1971, cannot be placed in any of the five genera considered here and its correct
generic placement is unknown.
Species of the genus Dynamenopsis are known only from New Zealand and
South and Western Australia.
Cymodocella Pfeffer, 1887
Diagnosis.—Eubranchiate Sphaeromatidae with antennular peduncle article 1 not
extended anteriorly as plate. Both sexes with pereon and pleon lacking dorsal
processes. Both sexes with rami of uropod lamellar; endopod greater than half
length of exopod. Apex of pleotelson with lateral margins curving ventrally and
meeting in midline producing cylindrical, posteriorly directed aperture. All pereopods
with simple accessory unguis, not markedly bifid. Exopod of pleopod 3
without articulation. Sexual dimorphism not pronounced.
Adult Male.—Penes short, stout, separate to base. Appendix masculina arising
from internoproximal angle of endopod of pleopod 2 and extending beyond apex
of endopod. Exopod of uropod usually relatively longer than that of female.
Ovigerous Female.—Mouthparts not metamorphosed. Exopod of uropod usually
shorter than that of male. Brood pouch formed posteriorly as pocket, opening
anteriorly at level of pereopod 4; and anteriorly as three pairs of large oostegites
arising from pereopods 2 to 4 and overlapping well in midline. Brood not incubated
in pouch thus formed, but in invaginations of ventral body wall.
Type-species.—Cymodocella tubicauda Pfeffer, 1887.