Lamarckdromia globosa ( Lamarck, 1818 )

Mclay, Colin L. & Hosie, Andrew M., 2022, The sponge crabs of Western Australia and the Northwest Shelf with descriptions of new genera and species (Crustacea: Brachyura: Dromiidae), Zootaxa 5129 (3), pp. 301-355 : 336-337

Lamarckdromia globosa ( Lamarck, 1818)

( Fig. 24A–E )

Dromia globosa Lamarck, 1818: 481 .— Milne Edwards, 1837: 177.—De Man 1887: 396, footnote, pl. 18, fig. 1A, B. Lamarckdromia globosa . — Guinot & Tavares, 2003: 70 (in part).

Type material. Lectotype: MNHN-B22033, male, CL 21.1 mm, damaged, dry, locality unknown.

Description. Carapace globose, smooth, finely punctate, covered by short tomentum of thick plumose setae, rostrum tridentate, teeth similar median tooth slightly longer; supraorbital margin armed with pointed tooth, suborbital margin triangular, with slightly protruding tooth. Anterolateral carapace margin armed with prominent pointed tooth at widest point, below sub-orbital level, dividing it into and anterior concave part (hepatic region) and convex posterior section (branchial region). Hepatic region concave with blunt ventral lobe, at level of buccal frame corner, connected by concave margin to the anterolateral tooth. Branchial region interrupted by indistinct tooth at branchial groove margin continuing almost directly posteriorly (apparently not convergent towards the middle). Pair of “epigastric” (frontal) lobes protruding slightly, separated by weak frontal groove and branchial groove present.

Milne Edwards (1837) described legs as large and very short; those of last pair almost as large as third pair. Dorsal margin of cheliped propodus with 3 or 4 small blunt proximal tubercles, with perhaps couple of smaller granules beside, remaining surface smooth; margins of movable and fixed fingers dentate, length of fingers approximately same as palm.

Remarks. Complete description of the type, as far as possible, is included here because it has not been written before. Only a few recognizable dry fragments of the type specimen remain, but a composite description can be made from the observations of those who examined it in its more intact state ( Lamarck 1818; Milne Edwards 1837; De Man 1887: pl. 18, fig. 1A, B) and our own observations of the fragments. Figure 24A–E includes De Man’s drawings and photographs of the male lectotype. The drawings accurately depict the recognizable fragments of the type and depict the same two intact pieces that we found and photographed ( Fig. 24A–C ). There are no figures of the intact animal, which may imply that when De Man examined the crab, it was already fragmented. Milne Edwards (1837) mentions the branchial grooves, but does not describe them, and he does not describe any other carapace features such as the cardiac grooves.

Distribution. Unknown. Only one male specimen is known lacking locality data.

Figures

FIGURE 24. Lamarckdromia globosa (Lamarck, 1818), male lectotype, CL 21.1 mm (MNHN-B22033): A, frontal view of right half of carapace; B, dorsal view of frontal margin of carapace; C, outer face right cheliped; D, dorsal view carapace (after De Man, 1887); E, outer face right cheliped. (After De Man 1887: pl. 18).