Genus Dilatatiocauda Harris, 2002

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• Dilatatiocauda Harris, V.A. 2002. A new genus belonging to the family Porcellidiidae (Crustacea: Copepoda: Harpacticoida) with three new species from Australia. Records of the Australian Museum 54: 1-24 [2].

  Type species:

   Porcellidium dilatatum Hicks, 1971 by original designation.

Distribution

States

New South Wales

Diagnosis

After Harris (2002). Anterior of female cephalosome semicircular, rostrum prominent, projects beyond cephalosome; anterior of male cephalosome truncated, male rostrum not pointed anteriorly; hyaline border on cephalosome and metasomal epimera appears granular, ducts from marginal glands open dorsal to hyaline membrane; dorsal pits present, ornamentation of net-like or honeycomb-like ridges may be present on parts of dorsal surface: labrum (hyperstome) with two grooved plates (comb plates) located near tip of mandibular incisor process; female urosome broad, division into anterior and posterior lobes indistinct, usually indicated by feint scar, anterior lobe without lateral striations, posterior lobe rounded, typically bordered with setules, caudal arch deep (>50% of urosome length); female caudal ramus elongate, rectangular (L/W ratio greater than or equal to 3), tendency to widen distally, posterior border not pointed, bevelled or deeply notched at external corner, alpha and beta setae close or very close, gamma seta on posterior border, terminal setae T1 to T4 present, terminal setae T2 and T3 close together; male caudal ramus short (quadrate), widens distally, setation similar to female; male antennule without anterior comb or accessory lobe, dactylus (terminal segment of antennule) lobed or expanded at its base; maxillule endopod with 6 setae, exopod with 2 setae; maxilliped medial lobes (coxae) widely separated in mid-line, basis quadrate (not elongate), no fimbriate process on basis; P1 with conspicuous area of denticulate pegs on endopod; endopod of p3 and p4 with long straight plumose or serrulate spinous terminal seta; female P5 exopod without ventral expansion, does not extend beyond urosome; male P5 with 6 terminal setae.

ID Keys

see Harris (2002).

Diagnosis References

Harris, V.A. 2002. A new genus belonging to the family Porcellidiidae (Crustacea: Copepoda: Harpacticoida) with three new species from Australia. Records of the Australian Museum 54: 1-24 [2]

Remarks

The genus is characterised by the unusual shape and structure of the maxillipeds which are widely separated in the mid-line and lack both the characteristic fimbriate edge and fimbriate process common to all other genera. The presence of labial comb plates, shape and setation of the caudal rami as well as the unusual stright spine-like terminal seta on P3 and P4 endopod are also characteristic. (Taken from Harris 2002).

General References

Harris, V.A. 2002. A new genus belonging to the family Porcellidiidae (Crustacea: Copepoda: Harpacticoida) with three new species from Australia. Records of the Australian Museum 54: 1-24 [1-24]

Harris, V.A. 2014. Porcellidiidae of Australia (Harpacticoida, Copepoda). III. Synopsis of genera and species. Records of the Australian Museum 66(2): 167–196 [Date published 2 April 2014]

Walker-Smith, G.K. 2003. The harpacticoid copepod fauna of Port Phillip Bay (Victoria, Australia) and their contribution to the diet of juvenile King George whiting (Sillaginodes punctata: Sillaginidae). PhD Thesis. The Zoology Department, The University of Melbourne, Victoria, Australia. 278 pp. [129-142]

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