Periclimenes ruber Bruce 1982
Creators: name: Ďuriš, Zdeněk
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Palaemonidae
Periclimenes
Periclimenes ruber

description: Periclimenes ruber Bruce, 1982   
 Periclimenes ruber Bruce, 1982a: 196 (key), 197, Figs. 3–5, 8f. — Chace & Bruce 1993: 59.   
 Type material. Ov. female holotype cl 2.5 mm, AM P.28106; male allotype, AM P.28107; ov. female paratype, RMNH D.31955.   
 Supplementary description. The ovigerous female paratype was examined. The specimen agrees in general with the original description (Bruce 1982a), except that the hepatic spine is placed distinctly lower than figured for the holotype. The third thoracic sternite is unarmed, the fourth sternite has a low transverse ridge divided medially by a notch. The third abdominal segment is finely denticulate dorsally along the posterior margin. The maxilla has a bilobed basal endite and an undeveloped coxal endite. All maxillipeds bear well-developed exopods; the third maxilliped exopod reaches to the ischiomeral distal end, and a small but well-developed arthrobranch is present on the third maxilliped. The first and second pereiopods are as described by Bruce (1982a). The first pereiopod chelae have their fingers slightly incurved and tapering to simple, not dilated tips. Medial sides of the fingers possess distinct tufts of long setae, the lateral tufts are less developed. The major second pereiopod has both fingers elongate and bears a hooked tip; the fingers: palm: carpus: merus length ratios are 1: 2: 1.1: 1.8 respectively, those in the minor second pereiopod are 1: 1.3: 1.4: 1.7 respectively.   
The ambulatory propodi are rather stout and have only the distal spines paired; more proximal ones are simple. The spines are short, not longer than the propodus depth, and are not arranged in a distinct prehensile mechanism.  
 Remarks. Periclimenes ruber occupies a rather isolated position within the genus. It is generally similar to P. granulimanus or P. laevimanus sp. nov., by the shape and length of the major second pereiopod. The epigastric spine, well-developed in P. brucei, P. granulimanus and P. laevimanus sp. nov., is lacking, as in P. tonga and also in some species of the P. obscurus group, such as P. batei (Borradaile, 1917), and P. sinensis Bruce, 1969. Further, the walking dactyli are simple, but stouter than in the species of the P. granulimanus group. On the other hand, a deeper rostrum, the stout eyes with a stalk length subequal to their width, the minor second pereiopod with fingers subequal to palm length, and the distoventral setose process on the first pereiopod coxa are characteristic for most of the P. obscurus species group.   
 Bruce (1982a) regarded Periclimenes ruber as close to P. affinis (Zehntner, 1894), another crinoid associate, with the latter having less unequal chelipeds (Bruce 1980). The walking dactyli are simple in these species, as well as in most species of the P. granulimanus group, but stouter. The distoventral setose process on the first pereiopod coxa, deeper rostrum, stouter eyes, antennal peduncle and scaphocerite are more similar to those of species of the P. obscurus group. Both these species thus appear remotely related to the P. obscurus group, but with P. ruber showing also a similarity with species of the P. granulimanus group.   
 Host. Zygometra microdiscus (Bell) (Echinodermata: Crinoidea), depth 8 m.   
 Color. Uniform red with some yellow spots (for details see: Bruce 1982a: 200).   
 Distribution. Bribie Passage, Pumicestone Channel, Queensland, Australia (type locality).
description: Published as part of Ďuriš, Zdeněk, 2010, Periclimenes laevimanus sp. nov. from Vietnam, with a review of the Periclimenes granulimanus species group (Crustacea: Decapoda: Palaemonidae: Pontoniinae) *, pp. 106-125 in Zootaxa 2372 (1) on pages 119-120, DOI: 10.11646/zootaxa.2372.1.12, http://zenodo.org/record/5308119