Proboloides holmesi Bousfield, 1973

Krapp-Schickel, Traudl, 2011, On the Austral-Antarctic stenothoids Proboloides, Metopoides, Torometopa and Scaphodactylus (Crustacea Amphipoda) Part 2: the genus Proboloides, with description of two new genera and the transfer of two nominal species to Metopoides, ZooKeys 86, pp. 11-45 : 23

? Proboloides holmesi Bousfield, 1973 Figs 67

Proboloides holmesi Bousfield, 1973: 89, fig. 16 (2)

Remarks

Although the shape of the gnathopods (especially the simple Gn1) creates doubt if it could not belong in Metopa or Stenula , checking of the mouthparts showed at least that this species has a Md palp with 3 arts and a palp of Mx1 with? 2 arts (although the articulation is not clear, see Bousfield 1973: 98). It is different from the other Atlantic members, but for the time being it should remain in the genus Proboloides .

At the Verona Museum I found a tiny specimen called " Metopa sp."(1,5 mm) which is extremely similar to Proboloides holmesi , except the rounded palmar corner (see Fig. 6, 7 and compare to Bousfield 1973 fig. 16 (2)); also here there seems to be a fine indistinct line in Mx1 palp. I am adding the illustration also to stress the fact how small the differences between the genera are, and to show that also the genus Metopa has to be included in this basic group of stenothoid genera.

Distribution.

S of Cape Cod; Vineyard Sound, Elizabeth Islands, Buzzard Bay ( Bousfield 1973).

Ecology.

Mainly on sandy and shelly sand bottoms, among hydroids and bryozoans, in depth of 5-30 m ( Bousfield 1973: 89).