Periclimenes guarapari, Grave, De, 2008

Grave, De, 2008, A new species of Periclimenes (Crustacea: Decapoda: Palaemonidae) from Guarapari, Espirito Santo, Brazil, Zootaxa 1925, pp. 14-22 : 15-20

publication ID

https://doi.org/ 10.5281/zenodo.184791

DOI

https://doi.org/10.5281/zenodo.6230753

persistent identifier

https://treatment.plazi.org/id/03A687B8-FF92-FFFB-FF51-E3A53844FAF4

treatment provided by

Plazi

scientific name

Periclimenes guarapari
status

sp. nov.

Periclimenes guarapari View in CoL sp. nov.

( Figs. 1–5 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 )

Material examined: Holotype ovigerous female (pocl 2.1mm), from Muricea flammea , Ilha Escalvada, in front of Guarapari City, Espirito Santo, Brazil, 17m depth, approximately 20º42’S 04º24’W, leg. P. Wirtz, 29 April 2006 ( MZUSP 18837); paratypes (17 ex., pocl 1.0– 2.1 mm), same data as holotype ( MZUSP 18838); paratypes (7 ex., pocl 1.6–2.1 mm), same data as holotype (OUMNH-ZC. 2008-12 -001); paratypes (7 ex., 1.2– 1.7 mm) from Plexaurella grandiflora , Ilha Escalvada, in front of Guarapari City, Espirito Santo, Brazil, 17m depth, approximately 20º42’S 04º24’W ( RMNH D53043), leg. P. Wirtz, 30 April 2006.

Derivation of name: Named after the type locality, the city of Guarapari , state of Espirito Santo, Brazil, used as a noun in apposition.

Description: Small pontoniine shrimp, adults attaining approximately 1.3–2.1 mm post-orbital carapace length (pocl). Rostrum relatively deep, not upturned ( Figs. 1 View FIGURE 1 A, C), extending to end of second segment of antennular peduncle; dorsally armed with 5–8 teeth, ventrally with 0–2 vestigial teeth; proximal dorsal tooth separated from remainder of series by considerable gap, situated proximal to hepatic tooth; second tooth nearly even with or slightly distal to posterior margin of ocular orbit. Carapace with well developed antennal and hepatic teeth, antennal tooth separated from lower margin of ocular orbit; hepatic tooth slightly larger than antennal tooth.

Abdominal pleura rounded ( Fig. 1 View FIGURE 1 D), sixth abdominal somite twice as long as fifth, lateral plate bluntly angular, unarmed.

Eye ( Fig. 1 View FIGURE 1 B) with cornea as wide as stalk, constricted at base; accessory pigment spot present, not facetted.

Antennular flagellum ( Fig. 2 View FIGURE 2 A) with lateral flagella fused for 4–5 segments, ventral branch with 3–4 free segments; 4 aesthetascs on the last two fused articles and along the free part of the ventral branch. Antennular peduncle with only 1 tooth on distolateral angle of basal segment. Antennal scale ( Fig. 2 View FIGURE 2 B) 3.5 times as long as wide, lateral margin straight; distolateral tooth falling short of distal margin of blade.

Mandible ( Fig. 2 View FIGURE 2 C) lacking palp, incisor process ending in 4 distinct teeth, mesial margin with 3 smaller teeth; molar process as illustrated. Maxillule ( Figs. 2 View FIGURE 2 D–E) with upper endite harbouring 5–6 stout, apical setae, interspersed with plumose setae, palp as illustrated. Maxilla ( Fig. 2 View FIGURE 2 F) with bilobed endite. First maxilliped ( Fig. 2 View FIGURE 2 G) with well-developed exopodal flagellum possessing 3 terminal plumose setae, epipod not bilobed; palp slender, lacking terminal setae. Second maxilliped ( Fig. 2 View FIGURE 2 H) possessing well developed exopod with terminal setae. Third maxilliped ( Fig. 2 View FIGURE 2 I) with basis separated from ischiomerus; exopod well-developed, falling short of distal margin of carpus.

First pereiopod ( Fig. 3 View FIGURE 3 A) stout, not extending beyond antennal scale; fingers of chelae equal in length to palm, cutting edges lacking teeth; chelae approximately equal to carpus in length, merus subequal to carpus in length. Second pereiopods ( Figs. 3 View FIGURE 3 B–C) unequal in size and length, extending beyond antennal scale. Chela of minor second pereiopod ( Fig. 3 View FIGURE 3 B) with fingers approximately equal in length to palm, cutting edges simple, tips single; chela 1.3 times as long as carpus, merus subequal to carpus, ischium subequal to merus, latter imperfectly divided into two articles. Major second pereiopod robust ( Fig. 3 View FIGURE 3 C), merus and ischium subequal, ischium imperfectly divided into two articles; chela twice as long as carpus, fingers of chela half length of palm; fingers of chela with single tips, cutting edge of pollex armed with single tooth in proximal third, cutting edge of dactylus armed with single tooth, margin mesially excavated ( Fig. 3 View FIGURE 3 D).

Third and fourth pereiopod ( Fig. 3 View FIGURE 3 E–F) with biunguiculate dactyli ( Fig. 4 View FIGURE 4 A), unguis demarcated, similar to each other in size and structure; propodi nearly 4 times length of dactyli, distal margin of flexor margin armed with, respectively, 4 and 3 single teeth; distolateral angle with pair of spines ( Fig. 4 View FIGURE 4 A); carpi half length of propodi, meri subequal to propodi. Fifth pereiopod ( Fig. 3 View FIGURE 3 G) smaller than preceding ones, propodus 4 times as long as dactylus, carpus half length of propodus, merus subequal in length to propodus; flexor margin of propodus armed with 3 single spines, distolateral margin with single spine ( Fig. 4 View FIGURE 4 B), setal brush poorly developed, consisting of 2 rows, with 4–5 comb-like setae each.

Uropods typical of the genus; exopod distinctly broader and longer than endopod, 0.3x longer than telson, distolateral tooth and associated movable spine well-developed, transverse suture indistinct. Telson approximately 3 times as long as wide; dorsolateral spines distinct ( Fig. 4 View FIGURE 4 C), proximal pair inserted at mid-length of telson, distal pair at 0.75; distal margin of telson ( Fig. 4 View FIGURE 4 D) with 2 pairs of spines and one (mesial) pair of plumose, stout setae, intermediate spines longest; terminal process between mesial pair of setae well-developed.

Second pleopod of male with appendices masculina and interna on endopod ( Fig. 4 View FIGURE 4 E), appendix masculina shorter than interna, provided with 2 distal and 1 subdistal serrulate setae.

Colour pattern ( Fig. 5 View FIGURE 5 ): Largely transparent, with scattered red chromatophores on abdomen, telson and uropods; distinctive transverse line of red chromatophores across first pleonite; legs transparent; antennae translucent.

Ecology: The type series was collected from the gorgonians, Muricea flammea Marques & Castro and Plexaurella grandiflora Verrill (Octocorallia, Alcyonacea , Plexauridae ), at depths ranging from 10 to 17m, together with Neopontonides beaufortensis (Borradaile, 1920)

Distribution: Currently known only from the type locality.

MZUSP

Museu de Zoologia da Universidade de Sao Paulo

RMNH

National Museum of Natural History, Naturalis

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