Periclimenaeus bredini Chace, 1972

Fransen, Charles H. J. M., 2023, The marine palaemonid shrimps (Crustacea, Deapoda, Caridea) of the Dutch Caribbean, Zootaxa 5387 (1), pp. 1-127 : 38-40

Periclimenaeus bredini Chace, 1972

( Fig. 18 )

Material examined. Curaçao: RMNH. CRUS.D.58129: 1 damaged specimen, 1 female, pocl. 1.35 mm; stn CAR.29, Fuikbaai , 12°02.855′N 68°49.838′W, 25.iv.2014, depth 26 m, scuba diving, Aplysina sp. , collected by C. Rauch.

RMNH. CRUS.D.58130: 1 female, pocl. 1.0 mm , R =6/0; stn COA.21, Marie Pampoen, 12°05′26.74″N 68°54′17.84″W, 05.ix.2013, depth 10 m, scuba diving, in rose sponge, D. anchorata (photo COA.21 033, 034), collected by C.H.J.M. Fransen.

Remarks. The morphological characters of the present two small specimens agree well with the original description by Chace (1972). Rostrum ( Fig. 18A, B ) straight with six dorsal teeth (7 in the type-specimen), without ventral teeth, almost reaching distal margin of basal segment of antennular peduncle. Carapace without supraorbital tubercle of tooth; antennal tooth small but distinct, placed at level of inferior orbital angle; inferior orbital angle rounded, not produced; pterygostomial angle not produced ( Fig. 18A ). Scaphocerite long, reaching to distal margin of antennular peduncle; distolateral tooth distinct, not overreaching distal margin of lamina; carpocerite short, reaching midlength of scaphocerite ( Fig. 18B ). Second pereiopods unequal in size and shape; ischium and merus with tubercles on ventral margins and inconspicuous scattered tubercles covering palm; distal part of fingers entire, without fine denticulation. Third pereiopod ( Fig. 18D ) distinctly more robust than fourth ( Fig. 18E ) and fifth, with few spines on ventral margin of propodus. Dactyli of ambulatory pereiopods ( Fig. 18D, E ) not biunguiculate, without proximal process. The ovigerous female holotype, which is much larger (pocl. 2.9 mm) than our female specimen (pocl. 1.0 mm), has the dactylus of the third and fourth pereiopod with an accessory tooth. It is supposed that this feature might develop in larger specimens. First abdominal segment without anterior median dorsal lobe. Sixth abdominal segment with posterolateral margin rounded, without tooth ( Fig. 18C ). Dorsal telson spines length about 0.1 times telson length; anterior pair situated at 0.1 of telson length, posterior pair at about 0.4 of telson tength; lateral pair of distal spines smaller than dorsal spines, located somewhat subdistally, intermediate and medial spines about twice as long as dorsal telson spines; distal margin with small median triangular tooth ( Fig. 18C ). Distolateral tooth of exopod of uropod distinct with mobile spine medially; mobile spine about twice as long as distolateral tooth ( Fig. 18C ).

The shrimps are translucent with scattered minute white chromatophores as figured by Pachelle et al. (2018: fig. 3).

Ecology. Known to live in association with sponges of the genera Aplysina (see Villamizar & Laughlin 1991). Now for the first time recorded from Desmapsamma anchorata (Carter, 1882) .

Distribution. The species has been previously reported from several localities in the western Atlantic, from Florida ( Dardeau 1984) , Caribbean coast of Mexico ( Chace 1972), Veracruz, Yucatán (Hernández-Aguilera et al. 1996), Cuba ( Martínez-Iglesias et al. 1993), Venezuela, Los Roques Archipelago ( Rodriguez, 1980; Villamizar & Laughlin 1991), and the Caribbean coast of Panama ( Pachelle et al, 2018) in depth of 1– 40 m. The species is herein recorded for the first time from Curaçao.

Figures

FIGURE 18. Periclimenaeus bredini Chace, 1972. RMNH.CRUS.D.58130, female, pocl. 1.0 mm. A, anterior appendages, lateral view; B, idem, dorsal view; C, tailfan; D, third left pereiopod, dactylus and distal part propodus, lateral view; E, fourth left pereiopod, dactylus and distal part propodus, lateral view. Scale bars: A, B=1.0 mm; C=0.25 mm; D, E=0.125 mm.