Petalidium, BATE, 1881

Vereshchaka, Alexander L. & Lunina, Anastasia A., 2015, Phylogeny and taxonomy of the enigmatic genus Petalidium (Decapoda, Sergestidae), with biological remarks, Zoological Journal of the Linnean Society 174 (3), pp. 459-472 : 466

PETALIDIUM BATE, 1881

Diagnosis: Carapace and abdomen smooth, rostrum as a small protrusion of carapace, acute; supraorbital spine absent; cornea well pigmented; stylocerite fixed; mandible with three-segmented palp; maxillipeds I–II each with well-developed endopod; maxilliped I with threesegmented endopod; maxilliped III seven-segmented, dactylus not subdivided; pereopods IV–V progressively decreasing in length, flat, six-segmented, lacking dactyli, two distal segments setose only on one margin; uropodal exopod setose for distal 20% of outer margin, with small tooth. Male clasping organ: well-developed, bearing numerous spatulate ordered spines on both inner margins, tubercle absent, replaced by long stout spine. Petasma: LA, Lac and LI developed, entire; LC rudimentary, without hooks; LT divided, PU short, bearing hook; PV elongate, armed with hooks. Photophores: dermal organs and organ of Pesta absent. Branchiae: pleurobranchs on somites VIII–XII, lamellar posterior arthrobranch on somite XII.

Type species: By monotypy, P. foliaceum Bate, 1881 ( Perez-Farfante & Kensley, 1997: 191).

Type locality: off Marion Island , 46°46′S, 45°31′E, depth 2516 m . South of Australia, 47°25′S, 130°22′E, depth 3935 m .

Species: Petalidium foliaceum Bate, 1881 ; P. obesum ( Krøyer, 1859) ; P. suspiriosum Burkenroad, 1937 .