Rudisullianassa Poore, Dworschak, Robles, Mantelatto and Felder, 2019

Poore, Gary C. B., 2023, New records, one new genus and 21 new species of Callianassidae (Crustacea, Axiidea) from the Indo-West Pacific, Memoirs of Museum Victoria 82, pp. 167-255 : 236

Rudisullianassa Poore, Dworschak, Robles, Mantelatto and Felder, 2019

Rudisullianassa Poore et al., 2019: 98–99 .— Robles et al., 2020: figs 1, 3, 6.— Poore and Ahyong, 2023: 213 .

Diagnosis. Hermaphrodite. Rostrum obsolete or obtusely triangular, flat, not reaching cornea. Cervical groove suture-like dorsally.Antennular peduncle exceeded by distal half of antennal peduncular article 5. Antennal scaphocerite simple, about as long as wide, apically rounded. Maxilliped 3 ischium-merus 1.5 times as long as wide; merus wider at ischium-merus suture than long; dactylus tapering, with scattered setae over upper margin, dense brush of short setae distally on lower margin or ovate, with dense brush of long setae over most of upper-distal margin, few setae along lower margin. Major cheliped merus widest distally, lower margin with or without denticles. Minor cheliped half width of major cheliped, both swollen; carpus upper margin shorter than propodus. Uropodal endopod ovoid, longer than wide, anterior margin straight, posterodistal margin evenly convex, with or without facial spiniform setae on rib. Uropodal exopod about as long as wide or about 1.5–1.8 times as long as wide, posterodistal margin with row of 6–8 long blade-like setae proximal to long setae on distal margin. Telson about as wide as long, tapering from anterolateral lobe; anterolateral lobe obsolete, undefined; posterior margin slightly concave, without medial spine.

Remarks. Poore et al (2019) diagnosed Rudisullianassa . Rudisullianassa rudisulcus (Komai, Fujita and Maenosono, 2014) and R. pandan sp. nov. are sister species in the molecular phylogram of Robles et al. (2020: fig. 3). Their closest neighbour in this analysis is Scallasis Bate, 1888 (see Komai et al., 2020 for rediagnosis). Morphologically, Rudisullianassa is most similar to Rayllianassa , differing in having the antennal peduncle longer than the antennular peduncle (vice versa or as long as each other in Rayllianassa ). Both genera are rediagnosed here but are hard to distinguish morphologically despite the apparent molecular separation.

Komai et al. (2014a) recorded R. rudisulcus from soft sediment, inferring the species was a sediment burrower as is typical of callianassids. Most of the records of the same species and a second from Papua New Guinea noted the presence of wood in the sample or that the shrimp was extracted from mud surrounding Pandanus roots. This suggests that both species burrow next to wood, as do some species of Rayllianassa .

Komai et al. (2014a) reported only one specimen of the type species, Rayllianassa rudisulcus , an ovigerous female. All the new material of this species and of a second species have both female and male gonopores, even while ovigerous.